kubernetes實踐之一:kubernetes二進制包安裝


kubernetes二進制部署

1、環境規划 

軟件

版本

Linux操作系統

CentOS Linux release 7.6.1810 (Core)

Kubernetes

1.9

Docker

18.09.3

etcd

3.3.10

   

角色

IP

組件

推薦配置

k8s_master

etcd01

192.168.1.153

kube-apiserver

kube-controller-manager

kube-scheduler

etcd

CPU 2核+ 2G內存+

k8s_node01

etcd02

192.168.1.154

kubelet

kube-proxy

docker

flannel

etcd

  

k8s_node02

etcd03

192.168.1.155

kubelet

kube-proxy

docker

flannel

etcd

  

2、 單Master集群架構

          

   

   

3、 系統常規參數配置

3.1 關閉selinux

                   sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config

                   setenforce 0         

3.2 文件數調整

      sed -i '/*          soft    nproc     4096/d' /etc/security/limits.d/20-nproc.conf

      echo '*  -  nofile  65536' >> /etc/security/limits.conf

      echo '*       soft    nofile  65535' >> /etc/security/limits.conf

      echo '*       hard    nofile  65535' >> /etc/security/limits.conf

      echo 'fs.file-max = 65536' >> /etc/sysctl.conf

3.3 防火牆關閉

                   systemctl disable firewalld.service

                   systemctl stop firewalld.service

3.4 常用工具安裝及時間同步

                   yum -y install vim telnet iotop openssh-clients openssh-server ntp net-tools.x86_64 wget

                   ntpdate time.windows.com

3.5 hosts文件配置(3個節點)

                   vim /etc/hosts

                   192.168.1.153 k8s_master

       192.168.1.154 k8s_node01

       192.168.1.155 k8s_node02

3.6 服務器之間免密鑰登錄

                  ssh-keygen

                  ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.1.154

                  ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.1.155

4、 自簽ssl證書

     

   

 4.1 etcd生成證書

                    

cfssl.sh   

etcd-cert.sh

etcd.sh

   

4.1.1 安裝cfssl工具(cfssl.sh)

      cd /home/k8s_install/ssl_etcd

      chmod +x cfssl.sh

      ./cfssl.sh

                    

                  內容如下:

                  curl -L https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -o /usr/local/bin/cfssl

      curl -L https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -o /usr/local/bin/cfssljson

      curl -L https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -o /usr/local/bin/cfssl-certinfo

      chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson /usr/local/bin/cfssl-certinfo

4.1.2 生成etcd 自簽ca證書(etcd-cert.sh)

      chmod +x etcd-cert.sh

      ./etcd-cert.sh

內容如下:

cat > ca-config.json <<EOF

{

  "signing": {

    "default": {

      "expiry": "87600h"

    },

    "profiles": {

      "www": {

         "expiry": "87600h",

         "usages": [

            "signing",

            "key encipherment",

            "server auth",

            "client auth"

        ]

      }

    }

  }

}

EOF

   

cat > ca-csr.json <<EOF

{

    "CN": "etcd CA",

    "key": {

        "algo": "rsa",

        "size": 2048

    },

    "names": [

        {

            "C": "CN",

            "L": "Beijing",

            "ST": "Beijing"

        }

    ]

}

EOF

   

cfssl gencert -initca ca-csr.json | cfssljson -bare ca –

      

#-----------------------

   

cat > server-csr.json <<EOF                                                                                                                                

{                                                                                                                                                          

    "CN": "etcd",                                                                                                                                          

    "hosts": [                                                                                                                                             

    "192.168.1.153",                                                                                                                                       

    "192.168.1.154",                                                                                                                                       

    "192.168.1.155",                                                                                                                                         

    "192.168.1.156",                                                                                                                                         

    "192.168.1.157"                                                                                                                                        

    ],                                                                                                                                                     

    "key": {                                                                                                                                               

        "algo": "rsa",                                                                                                                                     

        "size": 2048                                                                                                                                       

    },                                                                                                                                                     

    "names": [                                                                                                                                             

        {                                                                                                                                                  

            "C": "CN",                                                                                                                                     

            "L": "BeiJing",                                                                                                                                

            "ST": "BeiJing"                                                                                                                                

        }                                                                                                                                                 

    ]                                                                                                                                                      

}                                                                                                                                                          

EOF                                                                                                                                                        

                                                                                                                                                             

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server

注意:hosts一定要包含所有節點,可以多部署幾個預留節點以便后續擴容,否則還需要重新生成

4.1.3 etcd二進制包安裝

                   #存放配置文件,可執行文件,證書文件

                   mkdir /opt/etcd/{cfg,bin,ssl} -p

                   #ssl 證書切記復制到/opt/etcd/ssl/

                   cp {ca,server-key,server}.pem /opt/etcd/ssl/

                   

                   #部署etcd以及增加etcd服務(etcd.sh)

                   cd /home/k8s_install/soft/

                   tar -zxvf etcd-v3.3.10-linux-amd64.tar.gz

                   cd etcd-v3.3.10-linux-amd64

                   mv etcd etcdctl /opt/etcd/bin/

   

                   cd /home/k8s_install/ssl_etcd

                   chmod +x etcd.sh

                   參數說明:1.etcd名稱 2.本機ip 3.其他兩個etcd名稱以及地址

                   ./etcd.sh etcd01 192.168.1.153 etcd02=https://192.168.1.154:2380,etcd03=https://192.168.1.155:2380

                   執行后會卡住實際是在等待其他兩個節點加入

   

                  其他兩個node節點部署etcd:

                  scp -r /opt/etcd/ k8s_node01:/opt/

      scp -r /opt/etcd/ k8s_node02:/opt/

      scp /usr/lib/systemd/system/etcd.service k8s_node01:/usr/lib/systemd/system/

      scp /usr/lib/systemd/system/etcd.service k8s_node02:/usr/lib/systemd/system/

   

      #修改node節點配置文件(2個節點都需要更改)

      ssh k8s_node01

      vim /opt/etcd/cfg/etcd

      ETCD_NAME以及ip地址

       

      systemctl daemon-reload

      systemctl start etcd.service

   

etcd.sh腳本內容如下:

#!/bin/bash

   

ETCD_NAME=$1

ETCD_IP=$2

ETCD_CLUSTER=$3

   

WORK_DIR=/opt/etcd

   

cat <<EOF >$WORK_DIR/cfg/etcd

#[Member]

ETCD_NAME="${ETCD_NAME}"

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"

ETCD_LISTEN_PEER_URLS="https://${ETCD_IP}:2380"

ETCD_LISTEN_CLIENT_URLS="https://${ETCD_IP}:2379"

   

#[Clustering]

ETCD_INITIAL_ADVERTISE_PEER_URLS="https://${ETCD_IP}:2380"

ETCD_ADVERTISE_CLIENT_URLS="https://${ETCD_IP}:2379"

ETCD_INITIAL_CLUSTER="etcd01=https://${ETCD_IP}:2380,${ETCD_CLUSTER}"

ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"

ETCD_INITIAL_CLUSTER_STATE="new"

EOF

   

cat <<EOF >/usr/lib/systemd/system/etcd.service

[Unit]

Description=Etcd Server

After=network.target

After=network-online.target

Wants=network-online.target

   

[Service]

Type=notify

EnvironmentFile=${WORK_DIR}/cfg/etcd

ExecStart=${WORK_DIR}/bin/etcd \

--name=\${ETCD_NAME} \

--data-dir=\${ETCD_DATA_DIR} \

--listen-peer-urls=\${ETCD_LISTEN_PEER_URLS} \

--listen-client-urls=\${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379 \

--advertise-client-urls=\${ETCD_ADVERTISE_CLIENT_URLS} \

--initial-advertise-peer-urls=\${ETCD_INITIAL_ADVERTISE_PEER_URLS} \

--initial-cluster=\${ETCD_INITIAL_CLUSTER} \

--initial-cluster-token=\${ETCD_INITIAL_CLUSTER_TOKEN} \                                                                                                  

--initial-cluster-state=new \                                                                                                                              

--cert-file=${WORK_DIR}/ssl/server.pem \                                                                                                                  

--key-file=${WORK_DIR}/ssl/server-key.pem \                                                                                                                

--peer-cert-file=${WORK_DIR}/ssl/server.pem \                                                                                                              

--peer-key-file=${WORK_DIR}/ssl/server-key.pem \                                                                                                          

--trusted-ca-file=${WORK_DIR}/ssl/ca.pem \                                                                                                                 

--peer-trusted-ca-file=${WORK_DIR}/ssl/ca.pem                                                                                                             

Restart=on-failure                                                                                                                                         

LimitNOFILE=65536                                                                                                                                          

                                                                                                                                                            

[Install]                                                                                                                                                  

WantedBy=multi-user.target                                                                                                                                 

EOF                                                                                                                                                        

                                                                                                                                                             

systemctl daemon-reload                                                                                                                                   

systemctl enable etcd                                                                                                                                      

systemctl restart etcd

4.1.4 查看etcd集群健康情況

                   cd /opt/etcd/ssl

                   /opt/etcd/bin/etcdctl --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem  --endpoints="https://192.168.1.153:2379,https://192.168.1.154:2379,https://192.168.1.155:2379"  cluster-health

           

5、 安裝Docker(node 節點)

5.1 安裝依賴包

                   yum install -y yum-utils \ device-mapper-persistent-data \ lvm2

5.2 配置官方源(替換為阿里源)

                   yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

5.3 更新並安裝Docker-CE

                   yum makecache fast

                   yum install docker-ce -y

5.4 配置docker加速器

                   curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://f1361db2.m.daocloud.io

5.5 啟動docker

                   systemctl restart docker.service

                   systemctl enable docker.service

6、部署Flannel網絡

Overlay Network:覆蓋網絡,在基礎網絡上疊加的一種虛擬網絡技術模式,該網絡中的主機通過虛擬鏈路連接起來。 VXLAN:將源數據包封裝到UDP中,並使用基礎網絡的IP/MAC作為外層報文頭進行封裝,然后在以太網上傳輸,到達目的地后由隧道端點解封裝並將數據發送給目標地址。 Flannel:是Overlay網絡的一種,也是將源數據包封裝在另一種網絡包里面進行路由轉發和通信,目前已經支持UDP、VXLAN、AWS VPC和GCE路由等數據轉發方式。 多主機容器網絡通信其他主流方案:隧道方案( Weave、OpenvSwitch ),路由方案(Calico)等。

   

   

 

6.1 寫入分配的子網段到etcd,供flanneld使用(master)

         /opt/etcd/bin/etcdctl --ca-file=/opt/etcd/ssl/ca.pem --cert-file=/opt/etcd/ssl/server.pem --key-file=/opt/etcd/ssl/server-key.pem  --endpoints=https://192.168.1.153:2379,https://192.168.1.154:2379,https://192.168.1.155:2379  set /coreos.com/network/config '{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}'

6.2 二進制包安裝Flannel(node節點 flannel.sh)

         下載地址:https://github.com/coreos/flannel/releases/download/

         #

         mkdir /opt/kubernetes/{bin,cfg,ssl} -p

         cd /home/k8s_install/flannel_install/

         tar -zxvf flannel-v0.10.0-linux-amd64.tar.gz

         mv {flanneld,mk-docker-opts.sh} /opt/kubernetes/bin/

         cd /home/k8s_install/flannel_install

         chmod +x flannel.sh

   chmod +x /opt/kubernetes/bin/{flanneld,mk-docker-opts.sh}

         ./flannel.sh https://192.168.1.153:2379,https://192.168.1.154:2379,https://192.168.1.155:2379

          

腳本內容如下:

#!/bin/bash

   

ETCD_ENDPOINTS=${1:-"http://127.0.0.1:2379"}

   

cat <<EOF >/opt/kubernetes/cfg/flanneld

   

FLANNEL_OPTIONS="--etcd-endpoints=${ETCD_ENDPOINTS} \

-etcd-cafile=/opt/etcd/ssl/ca.pem \

-etcd-certfile=/opt/etcd/ssl/server.pem \

-etcd-keyfile=/opt/etcd/ssl/server-key.pem"

   

EOF

   

cat <<EOF >/usr/lib/systemd/system/flanneld.service

[Unit]

Description=Flanneld overlay address etcd agent

After=network-online.target network.target

Before=docker.service

   

[Service]

Type=notify

EnvironmentFile=/opt/kubernetes/cfg/flanneld

ExecStart=/opt/kubernetes/bin/flanneld --ip-masq \$FLANNEL_OPTIONS

ExecStartPost=/opt/kubernetes/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env

Restart=on-failure

   

[Install]

WantedBy=multi-user.target

   

EOF

   

cat <<EOF >/usr/lib/systemd/system/docker.service

   

[Unit]

Description=Docker Application Container Engine

Documentation=https://docs.docker.com

After=network-online.target firewalld.service

Wants=network-online.target

   

[Service]

Type=notify

EnvironmentFile=/run/flannel/subnet.env

ExecStart=/usr/bin/dockerd \$DOCKER_NETWORK_OPTIONS                                                                                                        

ExecReload=/bin/kill -s HUP \$MAINPID                                                                                                                     

LimitNOFILE=infinity                                                                                                                                       

LimitNPROC=infinity                                                                                                                                       

LimitCORE=infinity                                                                                                                                        

TimeoutStartSec=0                                                                                                                                          

Delegate=yes                                                                                                                                              

KillMode=process                                                                                                                                           

Restart=on-failure                                                                                                                                         

StartLimitBurst=3                                                                                                                                         

StartLimitInterval=60s                                                                                                                                     

                                                                                                                                                            

[Install]                                                                                                                                                  

WantedBy=multi-user.target                                                                                                                                 

                                                                                                                                                            

EOF                                                                                                                                                        

                                                                                                                                                            

systemctl daemon-reload                                                                                                                                    

systemctl enable flanneld                                                                                                                                  

systemctl restart flanneld                                                                                                                                

systemctl restart docker

   

6.3           查看flannel是否部署成功

       

   

7、部署Master組件

         mkdir /opt/kubernetes/{bin,cfg,ssl} -p

     cd /home/k8s_install/k8s_master_componet

         tar -zxvf kubernetes-server-linux-amd64.tar.gz

         cp -r kubernetes/server/bin/{kube-scheduler,kube-controller-manager,kube-apiserver} /opt/kubernetes/bin

         cp kubernetes/server/bin/kubectl /usr/bin/

         7.1 Kube-apiserver部署

                    chmod +x apiserver.sh

                    ./apiserver.sh 192.168.1.153 https://192.168.1.153:2379,https://192.168.1.154:2379,https://192.168.1.155:2379

            腳本內容:

#!/bin/bash

   

MASTER_ADDRESS=$1

ETCD_SERVERS=$2

   

cat <<EOF >/opt/kubernetes/cfg/kube-apiserver

   

KUBE_APISERVER_OPTS="--logtostderr=true \\

--v=4 \\

--etcd-servers=${ETCD_SERVERS} \\

--bind-address=${MASTER_ADDRESS} \\

--secure-port=6443 \\

--advertise-address=${MASTER_ADDRESS} \\

--allow-privileged=true \\

--service-cluster-ip-range=10.0.0.0/24 \\

--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \\

--authorization-mode=RBAC,Node \\

--kubelet-https=true \\

--enable-bootstrap-token-auth \\

--token-auth-file=/opt/kubernetes/cfg/token.csv \\

--service-node-port-range=30000-50000 \\

--tls-cert-file=/opt/kubernetes/ssl/server.pem  \\

--tls-private-key-file=/opt/kubernetes/ssl/server-key.pem \\

--client-ca-file=/opt/kubernetes/ssl/ca.pem \\

--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \\

--etcd-cafile=/opt/etcd/ssl/ca.pem \\

--etcd-certfile=/opt/etcd/ssl/server.pem \\

--etcd-keyfile=/opt/etcd/ssl/server-key.pem"

   

EOF

   

cat <<EOF >/usr/lib/systemd/system/kube-apiserver.service

[Unit]

Description=Kubernetes API Server

Documentation=https://github.com/kubernetes/kubernetes

   

[Service]

EnvironmentFile=-/opt/kubernetes/cfg/kube-apiserver

ExecStart=/opt/kubernetes/bin/kube-apiserver \$KUBE_APISERVER_OPTS

Restart=on-failure

   

[Install]

WantedBy=multi-user.target                                                                                                                                 

EOF                                                                                                                                                       

                                                                                                                                                             

systemctl daemon-reload                                                                                                                                    

systemctl enable kube-apiserver                                                                                                                           

systemctl restart kube-apiserver

     

  7.1.1 生成kube-apiserver自簽證書(k8s-cert.sh)

             chmod +x k8s-cert.sh

            ./k8s-cert.sh

            cp ca.pem server.pem ca-key.pem server-key.pem /opt/kubernetes/ssl/

   

            腳本內容如下:

            cat > ca-config.json <<EOF

{

  "signing": {

    "default": {

      "expiry": "87600h"

    },

    "profiles": {

      "kubernetes": {

         "expiry": "87600h",

         "usages": [

            "signing",

            "key encipherment",

            "server auth",

            "client auth"

        ]

      }

    }

  }

}

EOF

   

cat > ca-csr.json <<EOF

{

    "CN": "kubernetes",

    "key": {

        "algo": "rsa",

        "size": 2048

    },

    "names": [

        {

            "C": "CN",

            "L": "Beijing",

            "ST": "Beijing",

            "O": "k8s",

            "OU": "System"

        }

    ]

}

EOF

   

cfssl gencert -initca ca-csr.json | cfssljson -bare ca –

   

#-----------------------                                                                                                                                  

                                                                                                                                                             

cat > server-csr.json <<EOF                                                                                                                                

{                                                                                                                                                         

    "CN": "kubernetes",                                                                                                                                    

    "hosts": [                                                                                                                                             

      "10.0.0.1",                                                                                                                                         

      "127.0.0.1",                                                                                                                                         

      "192.168.1.153",                                                                                                                                    

      "192.168.1.154",                                                                                                                                     

      "192.168.1.155",                                                                                                                                     

      "192.168.1.156",                                                                                                                                    

      "192.168.1.157",                                                                                                                                     

      "192.168.1.158",                                                                                                                                    

      "192.168.1.159",                                                                                                                                     

      "192.168.1.160",                                                                                                                                     

      "kubernetes",                                                                                                                                       

      "kubernetes.default",                                                                                                                                

      "kubernetes.default.svc",                                                                                                                           

      "kubernetes.default.svc.cluster",                                                                                                                   

      "kubernetes.default.svc.cluster.local"                                                                                                               

    ],                                                                                                                                                    

    "key": {                                                                                                                                               

        "algo": "rsa",                                                                                                                                    

        "size": 2048                                                                                                                                      

    },                                                                                                                                                     

    "names": [                                                                                                                                            

        {                                                                                                                                                  

            "C": "CN",                                                                                                                                    

            "L": "BeiJing",                                                                                                                                

            "ST": "BeiJing",                                                                                                                               

            "O": "k8s",                                                                                                                                   

            "OU": "System"                                                                                                                                 

        }                                                                                                                                                 

    ]                                                                                                                                                      

}                                                                                                                                                          

EOF                                                                                                                                                       

                                                                                                                                                             

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server

   

#-----------------------                                                                                                                                  

                                                                                                                                                             

cat > admin-csr.json <<EOF                                                                                                                                 

{                                                                                                                                                         

  "CN": "admin",                                                                                                                                           

  "hosts": [],                                                                                                                                             

  "key": {                                                                                                                                                

    "algo": "rsa",                                                                                                                                         

    "size": 2048                                                                                                                                          

  },                                                                                                                                                       

  "names": [                                                                                                                                               

    {                                                                                                                                                     

      "C": "CN",                                                                                                                                           

      "L": "BeiJing",                                                                                                                                     

      "ST": "BeiJing",                                                                                                                                     

      "O": "system:masters",                                                                                                                               

      "OU": "System"                                                                                                                                      

    }                                                                                                                                                      

  ]                                                                                                                                                       

}                                                                                                                                                          

EOF                                                                                                                                                       

                                                                                                                                                             

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin

   

#-----------------------                                                                                                                                  

                                                                                                                                                             

cat > kube-proxy-csr.json <<EOF                                                                                                                           

{                                                                                                                                                          

  "CN": "system:kube-proxy",                                                                                                                               

  "hosts": [],                                                                                                                                            

  "key": {                                                                                                                                                 

    "algo": "rsa",                                                                                                                                        

    "size": 2048                                                                                                                                           

  },                                                                                                                                                       

  "names": [                                                                                                                                              

    {                                                                                                                                                      

      "C": "CN",                                                                                                                                          

      "L": "BeiJing",                                                                                                                                     

      "ST": "BeiJing",                                                                                                                                     

      "O": "k8s",                                                                                                                                         

      "OU": "System"                                                                                                                                       

    }                                                                                                                                                     

  ]                                                                                                                                                        

}                                                                                                                                                          

EOF                                                                                                                                                       

                                                                                                                                                             

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy

   

備注:hosts中盡量把未來可拓展的node加進來,之后就不用在重新生成自簽證書了.

7.1.2 生成token證書(kube_token.sh)

         sh kube_token.sh

         mv token.csv /opt/kubernetes/cfg/

         腳本內容如下(kube_token.sh):

         # 創建 TLS Bootstrapping Token

  BOOTSTRAP_TOKEN=$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ')

   

  cat > token.csv <<EOF

  ${BOOTSTRAP_TOKEN},kubelet-bootstrap,10001,"system:kubelet-bootstrap"

  EOF

          

7.1.3 部署kube-apiserver配置文件及服務

         cd /home/k8s_install/k8s_master_componet

         chmod +x apiserver.sh

         ./apiserver.sh 192.168.1.153 https://192.168.1.153:2379,https://192.168.1.154:2379,https://192.168.1.155:2379

         腳本內容如下(apiserver.sh):

         #!/bin/bash

   

MASTER_ADDRESS=$1

ETCD_SERVERS=$2

   

cat <<EOF >/opt/kubernetes/cfg/kube-apiserver

   

KUBE_APISERVER_OPTS="--logtostderr=true \\

--v=4 \\

--etcd-servers=${ETCD_SERVERS} \\

--bind-address=${MASTER_ADDRESS} \\

--secure-port=6443 \\

--advertise-address=${MASTER_ADDRESS} \\

--allow-privileged=true \\

--service-cluster-ip-range=10.0.0.0/24 \\

--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \\

--authorization-mode=RBAC,Node \\

--kubelet-https=true \\

--enable-bootstrap-token-auth \\

--token-auth-file=/opt/kubernetes/cfg/token.csv \\

--service-node-port-range=30000-50000 \\

--tls-cert-file=/opt/kubernetes/ssl/server.pem  \\

--tls-private-key-file=/opt/kubernetes/ssl/server-key.pem \\

--client-ca-file=/opt/kubernetes/ssl/ca.pem \\

--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \\

--etcd-cafile=/opt/etcd/ssl/ca.pem \\

--etcd-certfile=/opt/etcd/ssl/server.pem \\

--etcd-keyfile=/opt/etcd/ssl/server-key.pem"

   

EOF

   

cat <<EOF >/usr/lib/systemd/system/kube-apiserver.service

[Unit]

Description=Kubernetes API Server

Documentation=https://github.com/kubernetes/kubernetes

   

[Service]

EnvironmentFile=-/opt/kubernetes/cfg/kube-apiserver

ExecStart=/opt/kubernetes/bin/kube-apiserver \$KUBE_APISERVER_OPTS

Restart=on-failure

   

[Install]

WantedBy=multi-user.target                                                                                                                                

EOF                                                                                                                                                        

                                                                                                                                                             

systemctl daemon-reload                                                                                                                                   

systemctl enable kube-apiserver                                                                                                                            

systemctl restart kube-apiserver

   

         7.2 kube-controller-manager部署

                   7.2.1 部署controller-manager配置文件及服務

                   cd /home/k8s_install/k8s_master_componet

       chmod +x controller-manager.sh

                   ./controller-manager.sh 127.0.0.1

   

腳本內容如下:

#!/bin/bash

   

MASTER_ADDRESS=$1

   

cat <<EOF >/opt/kubernetes/cfg/kube-controller-manager

   

KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=true \\

--v=4 \\

--master=${MASTER_ADDRESS}:8080 \\

--leader-elect=true \\

--address=127.0.0.1 \\

--service-cluster-ip-range=10.0.0.0/24 \\

--cluster-name=kubernetes \\

--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \\

--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem  \\

--root-ca-file=/opt/kubernetes/ssl/ca.pem \\

--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \\

--experimental-cluster-signing-duration=87600h0m0s"

   

EOF

   

cat <<EOF >/usr/lib/systemd/system/kube-controller-manager.service

[Unit]

Description=Kubernetes Controller Manager

Documentation=https://github.com/kubernetes/kubernetes

   

[Service]

EnvironmentFile=-/opt/kubernetes/cfg/kube-controller-manager

ExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS

Restart=on-failure

   

[Install]

WantedBy=multi-user.target

EOF

   

systemctl daemon-reload

systemctl enable kube-controller-manager

systemctl restart kube-controller-manager

         7.3 Kube-scheduler部署

                  7.3.1 部署Kube-scheduler配置文件及服務

                   cd /home/k8s_install/k8s_master_componet

                   chmod +x scheduler.sh

                   ./scheduler.sh 127.0.0.1

   

腳本內容如下:

#!/bin/bash

   

MASTER_ADDRESS=$1

   

cat <<EOF >/opt/kubernetes/cfg/kube-controller-manager

   

KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=true \\

--v=4 \\

--master=${MASTER_ADDRESS}:8080 \\

--leader-elect=true \\

--address=127.0.0.1 \\

--service-cluster-ip-range=10.0.0.0/24 \\

--cluster-name=kubernetes \\

--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \\

--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem  \\

--root-ca-file=/opt/kubernetes/ssl/ca.pem \\

--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \\

--experimental-cluster-signing-duration=87600h0m0s"

   

EOF

   

cat <<EOF >/usr/lib/systemd/system/kube-controller-manager.service

[Unit]

Description=Kubernetes Controller Manager

Documentation=https://github.com/kubernetes/kubernetes

   

[Service]

EnvironmentFile=-/opt/kubernetes/cfg/kube-controller-manager

ExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS

Restart=on-failure

   

[Install]

WantedBy=multi-user.target

EOF

   

systemctl daemon-reload

systemctl enable kube-controller-manager

systemctl restart kube-controller-manager

7.4 查看Master狀態

kubectl get cs

8、部署Node組件

8.1 將kubelet-bootstrap用戶綁定到系統集群角色(master執行)

         kubectl create clusterrolebinding kubelet-bootstrap  --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap

8.2 創建kubeconfig文件(存放連接apiserver認證信息,master執行)

         cd /home/k8s_install/k8s_master_componet

         chmod +x kubeconfig.sh

         #執行之前需要保證BOOTSTRAP_TOKEN正確修改腳本BOOTSTRAP_TOKEN

         cat /opt/kubernetes/cfg/token.csv

        

   

         ./kubeconfig.sh 192.168.1.153 /home/k8s_install/k8s_master_componet/

         參數說明:param1:apiserver地址 param2:生成證書目錄

           

   

腳本說明:

APISERVER=$1

SSL_DIR=$2

BOOTSTRAP_TOKEN=18a5ee2b7525d343e112807ba5f101ae

   

# 創建kubelet bootstrapping kubeconfig

export KUBE_APISERVER="https://$APISERVER:6443"

   

# 設置集群參數

kubectl config set-cluster kubernetes \

  --certificate-authority=$SSL_DIR/ca.pem \

  --embed-certs=true \

  --server=${KUBE_APISERVER} \

  --kubeconfig=bootstrap.kubeconfig

   

# 設置客戶端認證參數

kubectl config set-credentials kubelet-bootstrap \

  --token=${BOOTSTRAP_TOKEN} \

  --kubeconfig=bootstrap.kubeconfig

   

# 設置上下文參數

kubectl config set-context default \

  --cluster=kubernetes \

  --user=kubelet-bootstrap \

  --kubeconfig=bootstrap.kubeconfig

   

# 設置默認上下文

kubectl config use-context default --kubeconfig=bootstrap.kubeconfig

   

#----------------------

   

# 創建kube-proxy kubeconfig文件

   

kubectl config set-cluster kubernetes \

  --certificate-authority=$SSL_DIR/ca.pem \

  --embed-certs=true \

  --server=${KUBE_APISERVER} \

  --kubeconfig=kube-proxy.kubeconfig

   

kubectl config set-credentials kube-proxy \

  --client-certificate=$SSL_DIR/kube-proxy.pem \

  --client-key=$SSL_DIR/kube-proxy-key.pem \

  --embed-certs=true \

  --kubeconfig=kube-proxy.kubeconfig                                                                                                                      

                                                                                                                                                             

kubectl config set-context default \                                                                                                                      

  --cluster=kubernetes \                                                                                                                                   

  --user=kube-proxy \                                                                                                                                      

  --kubeconfig=kube-proxy.kubeconfig                                                                                                                      

                                                                                                                                                             

kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

   

8.3 復制kubeconfig文件到node節點

                   scp -r  *.kubeconfig  k8s_node01:/opt/kubernetes/cfg/

                   scp -r  *.kubeconfig  k8s_node02:/opt/kubernetes/cfg/

8.4 部署kubelet組件

                   #復制包到node節點

scp kubelet kube-proxy k8s_node01:/opt/kubernetes/bin/

                   cd /home/k8s_install/k8s_node_componet

                   chmod +x kubelet.sh

                   ./kubelet.sh 192.168.1.154

   

腳本如下:

 #!/bin/bash

NODE_ADDRESS=$1

DNS_SERVER_IP=${2:-"10.0.0.2"}

   

cat <<EOF >/opt/kubernetes/cfg/kubelet

   

KUBELET_OPTS="--logtostderr=true \\

--v=4 \\

--hostname-override=${NODE_ADDRESS} \\

--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \\

--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \\

--config=/opt/kubernetes/cfg/kubelet.config \\

--cert-dir=/opt/kubernetes/ssl \\

--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"

   

EOF

   

cat <<EOF >/opt/kubernetes/cfg/kubelet.config

   

kind: KubeletConfiguration

apiVersion: kubelet.config.k8s.io/v1beta1

address: ${NODE_ADDRESS}

port: 10250

readOnlyPort: 10255

cgroupDriver: cgroupfs

clusterDNS:

- ${DNS_SERVER_IP}

clusterDomain: cluster.local.

failSwapOn: false

authentication:

  anonymous:

    enabled: true

EOF

cat <<EOF >/usr/lib/systemd/system/kubelet.service

[Unit]

Description=Kubernetes Kubelet

After=docker.service

Requires=docker.service

   

[Service]

EnvironmentFile=/opt/kubernetes/cfg/kubelet                                                                                                                

ExecStart=/opt/kubernetes/bin/kubelet \$KUBELET_OPTS                                                                                                      

Restart=on-failure                                                                                                                                         

KillMode=process                                                                                                                                          

                                                                                                                                                            

[Install]                                                                                                                                                  

WantedBy=multi-user.target                                                                                                                                

EOF                                                                                                                                                        

                                                                                                                                                             

systemctl daemon-reload                                                                                                                                   

systemctl enable kubelet                                                                                                                                   

systemctl restart kubelet

   

   

8.5 部署kube-proxy組件

                   cd /home/k8s_install/k8s_node_componet

                   chmod +x proxy.sh

                   ./proxy.sh 192.168.1.154

   

腳本如下:

#!/bin/bash

   

NODE_ADDRESS=$1

   

cat <<EOF >/opt/kubernetes/cfg/kube-proxy

   

KUBE_PROXY_OPTS="--logtostderr=true \\

--v=4 \\

--hostname-override=${NODE_ADDRESS} \\

--cluster-cidr=10.0.0.0/24 \\

--proxy-mode=ipvs \\

--kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig"

   

EOF

   

cat <<EOF >/usr/lib/systemd/system/kube-proxy.service

[Unit]

Description=Kubernetes Proxy

After=network.target

   

[Service]

EnvironmentFile=-/opt/kubernetes/cfg/kube-proxy

ExecStart=/opt/kubernetes/bin/kube-proxy \$KUBE_PROXY_OPTS

Restart=on-failure

   

[Install]

WantedBy=multi-user.target

EOF

   

systemctl daemon-reload

systemctl enable kube-proxy

systemctl restart kube-proxy

   

8.6 master授權node請求簽名

                   kubectl get csr

                  

                   kubectl certificate approve node-csr-aCTdx_2qXRajXlHrIlg2uPddhpexw8NRHP5EEtPllps

   

9、查詢集群狀態

# kubectl get node

  

# kubectl get componentstatus

 

   

   

10、啟動一個測試示例

# kubectl create deployment nginx --image=nginx

# kubectl get pod -o wide

# kubectl expose deployment nginx --port=88 --target-port=80 --type=NodePort

# kubectl get svc nginx

 

   

http://192.168.1.154:40287/

 

   

授權:

kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=system:anonymous

   

11、新增一個node節點步驟

本文以157為例子

11.1 參照三章系統常規參數配置

            更新hosts(所有節點)

     vim /etc/hosts

             192.168.1.153 k8s_master

192.168.1.154 k8s_node01

192.168.1.155 k8s_node02

192.168.1.157 k8s_node03

   

11.2 安裝Docker 參照第五章

11.3 從node01復制文件到node03

                   scp -r /opt/kubernetes/  k8s_node03:/opt/

                   scp /usr/lib/systemd/system/{kubelet,kube-proxy}.service k8s_node03:/usr/lib/systemd/system/

11.3.1 替換node節點ip

                   cd /opt/kubernetes/cfg

                  

   

                   需要修改:kubelet,kubelet.config,kube-proxy文件ip

                  

11.3.2 刪除node01認證信息

                   rm -rf /opt/kubernetes/ssl/*

11.3.3 啟動kubelet,kube-proxy服務

                   systemctl start kubelet.service

                   systemctl enable kubelet.service

                   systemctl start kube-proxy.service

       systemctl enable kube-proxy.service

   

11.3.4 master授權新加入node

                  # kubectl get csr

                 

                   kubectl certificate approve node-csr-tE3KOFUjDDu1VLUZQNmEqwhdpRhU-RBRfWIIbAD3Xj8

       

   

   

12、K8s高可用搭建

環境規划:

角色

IP

組件

推薦配置

k8s_master

etcd01

192.168.1.153

kube-apiserver

kube-controller-manager

kube-scheduler

etcd

CPU 2核+ 2G內存+

k8s_master02

  

192.168.1.157

kube-apiserver

kube-controller-manager

kube-scheduler

etcd

  

k8s_node01

etcd02

192.168.1.154

kubelet

kube-proxy

docker

flannel

etcd

  

k8s_node02

etcd03

192.168.1.155

kubelet

kube-proxy

docker

flannel

etcd

  

Load Balancer

(Master)

192.168.1.158

192.168.1.160

(VIP)

Nginx L4

  

Load Balancer

(Backup)

192.168.1.159

Nginx L4

  

   

   

     多master集群架構

     

   

   

12.1 高可用LB環境搭建(keepalived+nginx)

nginx安裝:

rpm -Uvh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm

yum install -y nginx

   

keepalived安裝:

yum -y install keepalived

   

nginx配置增加stream模塊:

vim /etc/nginx/nginx.conf

stream {

   log_format  main  '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';

   access_log  /var/log/nginx/k8s-access.log  main;

   upstream k8s-apiserver {

        server 192.168.1.153:6443;

        server 192.168.1.157:6443;

   }

   server {

        listen 6443;

        proxy_pass k8s-apiserver;                            

   }                                                         

}

service nginx start

   

keepalived配置:

! Configuration File for keepalived

global_defs {

   notification_email {

     acassen@firewall.loc

     failover@firewall.loc

     sysadmin@firewall.loc

   }

   notification_email_from Alexandre.Cassen@firewall.loc

   smtp_server 127.0.0.1

   smtp_connect_timeout 30

   router_id NGINX_MASTER

}

vrrp_script check_nginx {

    script "/etc/nginx/check_nginx.sh"

}

vrrp_instance VI_1 {

    state MASTER

    interface enp0s8

    virtual_router_id 51 # VRRP 路由 ID實例,每個實例是唯一的

    priority 100    # 優先級,備服務器設置 90

    advert_int 1    # 指定VRRP 心跳包通告間隔時間,默認1秒

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        192.168.1.160/24

    }

    track_script {

        check_nginx

    }

}

keepalived檢查nginx狀態腳本:

vim /etc/nginx/check_nginx.sh

count=$(ps -ef |grep nginx |egrep -cv "grep|$$")

   

if [ "$count" -eq 0 ];then

    /etc/init.d/keepalived stop

fi

   

12.2 高可用Master02搭建

復制master01文件:

scp -r /opt/kubernetes/ k8s_master02:/opt/

scp -r /opt/etcd/  k8s_master02:/opt/

scp /usr/bin/kubectl k8s_master02:/usr/bin/

scp /usr/lib/systemd/system/kube-* k8s_master02:/usr/lib/systemd/system

   

修改配置文件(master02):

vim /opt/kubernetes/cfg/kube-apiserver

--bind-address=192.168.1.157 \

--advertise-address=192.168.1.157 \

   

   

啟動Master服務:

systemctl start kube-apiserver

systemctl enable kube-apiserver

systemctl start kube-scheduler

systemctl enable kube-scheduler

systemctl start kube-controller-manager

systemctl enable kube-controller-manager

   

# kubectl get node

NAME            STATUS   ROLES    AGE     VERSION

192.168.1.154   Ready    <none>   6h15m   v1.13.4

192.168.1.155   Ready    <none>   6h4m    v1.13.4

   

12.3 Node重新指向Load Balancer

cd /opt/kubernetes/cfg

     

   

需要修改bootstrap.kubeconfig,kubelet.kubeconfig,kube-proxy.kubeconfig為VIP 192.168.1.160

   

重新啟動服務:

systemctl restart kubelet

systemctl restart kube-proxy

   

12.4 測試高可用部署是否成功:

重新創建kubeconfig文件(存放連接apiserver認證信息,master01執行)

cd /home/k8s_install/k8s_master_componet/

./kubelet_new.sh

會生成一個config文件

腳本如下:

kubectl config set-cluster kubernetes --server=https://192.168.1.160:6443 --embed-certs=true  --certificate-authority=ca.pem --kubeconfig=config

kubectl config set-credentials cluster-admin --certificate-authority=ca.pem  --embed-certs=true  --client-key=admin-key.pem  --client-certificate=admin.pem  --kubeconfig=config

kubectl config set-context default --cluster=kubernetes --user=cluster-admin --kubeconfig=config

kubectl config use-context default --kubeconfig=config

   

node01節點執行(把config,kubectl復制到node01節點):

scp /usr/bin/kubectl k8s_node01:/usr/bin/

scp config k8s_node01:/root/

kubectl --kubeconfig=/root/config get node

NAME            STATUS   ROLES    AGE     VERSION

192.168.1.154   Ready    <none>   7h7m    v1.13.4

192.168.1.155   Ready    <none>   6h56m   v1.13.4

   

備注:二進制包及部署腳本下載地址

鏈接:https://pan.baidu.com/s/1wr4y84hakxV8kncQ_ogCGw  密碼:pp6c

由於博客園排版問題有需要word可以自行文檔下載地址:

鏈接:https://pan.baidu.com/s/1b2CHnhAW45fxxf8qW-rEvw  密碼:i1nc

新增HA腳本下載地址:

鏈接:https://pan.baidu.com/s/11lkHP1vslHBDZpR49MUYqQ  密碼:ktew

   

   

  


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