本篇文章是基於Docker搭建大數據集群系列的開篇之作
主要內容
- docker搭建
- docker部署CentOS
- 容器免密鑰通信
- 容器保存成鏡像
- docker鏡像發布
環境
- Linux 7.6
一、Docker安裝
安裝工具包
yum install -y yum-utils #安裝工具包，缺少這些依賴將無法完成```
### 設置遠程倉庫
```bash
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo```
### 安裝
```bash
yum install docker-ce```
### 啟動
```bash
systemctl start docker```
### 查看版本
```bash
docker version```
### 校驗
```bash
docker run hello-world```
## 二、docker部署CentOS
### 拉取鏡像
```bash
docker pull centos```
### 查看是否拉取成功
```bash
docker imsages```
### 設置docker網橋，用於分配固定IP
```bash
docker network create --subnet=172.15.0.0/16 netgroup```
### 創建容器
> --name 容器名稱
> -h 容器主機名
> --net 設置網橋
> --ip 指定容器IP
**master**
docker run -d --privileged -ti -v /sys/fs/cgroup:/sys/fs/cgroup --name cluster-master -h cluster-master --net netgroup --ip 172.15.0.2 centos /usr/sbin/init
**slave1**
docker run -d --privileged -ti -v /sys/fs/cgroup:/sys/fs/cgroup --name cluster-slave1-h cluster-slave1--net netgroup --ip 172.15.0.3 centos /usr/sbin/init
**slave2**
docker run -d --privileged -ti -v /sys/fs/cgroup:/sys/fs/cgroup --name cluster-slave2-h cluster-slave2--net netgroup --ip 172.15.0.4 centos /usr/sbin/init
**slave3**
docker run -d --privileged -ti -v /sys/fs/cgroup:/sys/fs/cgroup --name cluster-slave3-h cluster-slave3--net netgroup --ip 172.15.0.5 centos /usr/sbin/init
### 查看運行中的容器
```bash
docker ps```
### 查看所有容器，包括未運行的容器
```bash
docker pa -a```
### 運行容器
```bash
docker run 容器名或容器ID```
### 進入容器
```bash
docker run exec -ti 容器名或容器ID bash```
### 配置hosts文件
```bash
#安裝VIM編輯工具
yum install vim
vim /etc/hosts
#追加以下內容
172.15.0.2 cluster-master
172.15.0.3 cluster-slave1
172.15.0.4 cluster-slave2
172.15.0.5 cluster-slave3
#將配置文件發送到其它節點
scp /etc/hosts cluster-slave1:/etc/
scp /etc/hosts cluster-slave2:/etc/
scp /etc/hosts cluster-slave3:/etc/
三、容器免密鑰通信
更換阿里YUM源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
部署OpenSSH
yum -y install openssh openssh-server openssh-clients
systemctl start sshd
生成密鑰
敲出下面命令后連續回車三次
ssh-keygen -t rsa```
### 設置用戶密碼
```bash
passwd root```
### 公鑰分發
> 在所有結點都生成密鑰之后再進行這步
**master**
``` bash
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-master
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave1
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave2
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave3
slave1
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-master
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave1
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave2
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave3
slave2
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-master
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave1
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave2
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave3
slave3
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-master
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave1
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave2
ssh-copy-id -f -i ~/.ssh/id_rsa.pub cluster-slave3
測試免密鑰
第一次敲下面命令時，會向你詢問，直接打
yes，然后輸入對應主機的訪問密碼
第二次敲ssh命令時，應當直接能夠訪問，無需輸入密碼
退出當前用戶使用命令exit
master
ssh cluster-master
ssh cluster-slave1
ssh cluster-slave1
ssh cluster-slave1
slave1
ssh cluster-master
ssh cluster-slave1
ssh cluster-slave1
ssh cluster-slave1
slave2
ssh cluster-master
ssh cluster-slave1
ssh cluster-slave1
ssh cluster-slave1
slave3
ssh cluster-master
ssh cluster-slave1
ssh cluster-slave1
ssh cluster-slave1
四、容器保存成鏡像
docker commit -m '提交文字說明' -a '作者' 容器名 提交后的鏡像名:提交后的鏡像tag名
五、鏡像推送到遠程倉庫
新建賬號
創建一個鏡像倉庫
給需要推送的鏡像打標簽
docker tag 鏡像id 要推入的倉庫的用戶名/要推入的倉庫名:新定義的tag
推送鏡像到倉庫
docker push 要推入的倉庫的用戶名/要推入的倉庫名:鏡像標簽