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etcd+coredns

本文轉載自   查看原文   2021-04-14 13:15   252    coredns/ etcd+coredns/ etcd

簡介

 etcd是使用Go語言開發的一個開源的、高可用的分布式key-value存儲系統，可以用於配置共享和服務的注冊和發現。

CoreDNS 其實就是一個 DNS 服務，所以很多開源項目以及工程師都會使用 CoreDNS 為集群提供服務發現的功能

ETCD 安裝

使用yum安裝，最簡化配置，非集群，生成環境建議部署etcd集群。 安裝

# yum install etcd -y

啟動etcd

# systemctl start etcd

設置開機啟動

# systemctl enable etcd

coredns安裝

下載二進制版本：https://github.com/coredns/coredns/releases 解壓安裝

# tar zxvf coredns_1.3.0_linux_amd64.tgz
# mv coredns /usr/local/bin
# mkdir /etc/coredns

添加主配置文件 vi /etc/coredns/Corefile，內容如下：
.:53 {    # 監聽tcp和udp的53端口
    etcd {   # 配置啟用etcd插件,后面可以指定域名,例如 etcd test.com {
        stubzones # 啟用存根區域功能。 stubzone僅在位於指定的第一個區域下方的etcd樹中完成
        path /coredns # etcd里面的路徑 默認為/skydns，以后所有的dns記錄就是存儲在該存根路徑底下
        endpoint http://localhost:2379 # etcd訪問地址，多個空格分開
        
        # upstream設置要使用的上游解析程序解決指向外部域名的在etcd（認為CNAME）中找到的外部域名。
        upstream 8.8.8.8:53 8.8.4.4:53 /etc/resolv.conf 
        
        fallthrough # 如果區域匹配但不能生成記錄，則將請求傳遞給下一個插件
        # tls CERT KEY CACERT # 可選參數，etcd認證證書設置
    }
    prometheus  # 監控插件
    cache 160
    loadbalance   # 負載均衡，開啟DNS記錄輪詢策略
    proxy . 8.8.8.8:53 8.8.4.4:53 /etc/resolv.conf  # 上面etcd未查詢到的請求轉發給設置的DNS服務器解析
    log # 打印日志
}

 

啟動coredns

# nohup /usr/local/bin/ -conf /etc/coredns/Corefile > /tmp/coredns.log 2>&1 &

 

也可以將coredns注冊成服務 vim /usr/lib/systemd/system/coredns.service  添加如下內容

[Unit]
Description=CoreDNS DNS server
Documentation=https://coredns.io
After=network.target

[Service]
Type=simple
EnvironmentFile=-/etc/default/coredns
PermissionsStartOnly=true
LimitNOFILE=1048576
LimitNPROC=512
CapabilityBoundingSet=CAP_NET_BIND_SERVICE 
AmbientCapabilities=CAP_NET_BIND_SERVICE 
NoNewPrivileges=true 
User=root
# WorkingDirectory=~
ExecStart=/usr/local/bin/coredns $ARGS 
ExecReload=/bin/kill -SIGUSR1 $MAINPID
Restart=on-failure

[Install]
WantedBy=multi-user.target

 

# systemctl daemon-reload 
# systemctl start coredns

測試命令

# dig @127.1 www.baidu.com +short
www.a.shifen.com.
www.wshifen.com.
103.235.46.39

 

 

ETCD集群配置

一般etcd集群需要3個或3個以上的奇數節點，我們這里使用兩個節點測試看會是什么情況

node1 10.180.11.3，node2 10.180.11.2

  1 [root@node1 ~]# cat /etc/etcd/etcd.conf
  2 #[Member]
  3 #ETCD_CORS=""
  4 #ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
  5 ETCD_DATA_DIR="/home/etcd/data.etcd"
  6 #ETCD_WAL_DIR=""
  7 #ETCD_LISTEN_PEER_URLS="http://localhost:2380"
  8 ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380"
  9 ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
 10 #ETCD_MAX_SNAPSHOTS="5"
 11 #ETCD_MAX_WALS="5"
 12 ETCD_NAME="etcd_dns_node1"
 13 #ETCD_SNAPSHOT_COUNT="100000"
 14 #ETCD_HEARTBEAT_INTERVAL="100"
 15 #ETCD_ELECTION_TIMEOUT="1000"
 16 #ETCD_QUOTA_BACKEND_BYTES="0"
 17 #ETCD_MAX_REQUEST_BYTES="1572864"
 18 #ETCD_GRPC_KEEPALIVE_MIN_TIME="5s"
 19 #ETCD_GRPC_KEEPALIVE_INTERVAL="2h0m0s"
 20 #ETCD_GRPC_KEEPALIVE_TIMEOUT="20s"
 21 #
 22 #[Clustering]
 23 #ETCD_INITIAL_ADVERTISE_PEER_URLS="http://localhost:2380"
 24 ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.180.11.3:2380"
 25 #ETCD_ADVERTISE_CLIENT_URLS="http://localhost:2379"
 26 ETCD_ADVERTISE_CLIENT_URLS="http://10.180.11.3:2379"
 27 #ETCD_DISCOVERY=""
 28 #ETCD_DISCOVERY_FALLBACK="proxy"
 29 #ETCD_DISCOVERY_PROXY=""
 30 #ETCD_DISCOVERY_SRV=""
 31 ETCD_INITIAL_CLUSTER="etcd_dns_node1=http://10.180.11.3:2380,etcd_dns_node2=http://10.180.11.2:2380"
 32 ETCD_INITIAL_CLUSTER_TOKEN="etcd-dns-cluster"
 33 ETCD_INITIAL_CLUSTER_STATE="new"
 34 #ETCD_STRICT_RECONFIG_CHECK="true"
 35 #ETCD_ENABLE_V2="true"
 36 #
 37 #[Proxy]
 38 #ETCD_PROXY="off"
 39 #ETCD_PROXY_FAILURE_WAIT="5000"
 40 #ETCD_PROXY_REFRESH_INTERVAL="30000"
 41 #ETCD_PROXY_DIAL_TIMEOUT="1000"
 42 #ETCD_PROXY_WRITE_TIMEOUT="5000"
 43 #ETCD_PROXY_READ_TIMEOUT="0"
 44 #
 45 #[Security]
 46 #ETCD_CERT_FILE=""
 47 #ETCD_KEY_FILE=""
 48 #ETCD_CLIENT_CERT_AUTH="false"
 49 #ETCD_TRUSTED_CA_FILE=""
 50 #ETCD_AUTO_TLS="false"
 51 #ETCD_PEER_CERT_FILE=""
 52 #ETCD_PEER_KEY_FILE=""
 53 #ETCD_PEER_CLIENT_CERT_AUTH="false"
 54 #ETCD_PEER_TRUSTED_CA_FILE=""
 55 #ETCD_PEER_AUTO_TLS="false"
 56 #
 57 #[Logging]
 58 #ETCD_DEBUG="false"
 59 #ETCD_LOG_PACKAGE_LEVELS=""
 60 #ETCD_LOG_OUTPUT="default"
 61 #
 62 #[Unsafe]
 63 #ETCD_FORCE_NEW_CLUSTER="false"
 64 #
 65 #[Version]
 66 #ETCD_VERSION="false"
 67 #ETCD_AUTO_COMPACTION_RETENTION="0"
 68 #
 69 #[Profiling]
 70 #ETCD_ENABLE_PPROF="false"
 71 #ETCD_METRICS="basic"
 72 #
 73 #[Auth]
 74 #ETCD_AUTH_TOKEN="simple"
 75 [root@node1 ~]#
 76 
 77 
 78 [root@node1 ~]# cat /etc/etcd/etcd.conf
 79 #[Member]
 80 ETCD_DATA_DIR="/home/etcd/data.etcd"
 81 ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380"
 82 ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
 83 ETCD_NAME="etcd_dns_node2"
 84 #
 85 #[Clustering]
 86 ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.180.11.2:2380"
 87 ETCD_ADVERTISE_CLIENT_URLS="http://10.180.11.2:2379"
 88 ETCD_INITIAL_CLUSTER="etcd_dns_node1=http://10.180.11.3:2380,etcd_dns_node2=http://10.180.11.2:2380"
 89 ETCD_INITIAL_CLUSTER_TOKEN="etcd-dns-cluster"
 90 ETCD_INITIAL_CLUSTER_STATE="existing"
 91 #
 92 #[Member]
 93 #ETCD_CORS=""
 94 #ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
 95 #ETCD_DATA_DIR="/home/etcd/data.etcd"
 96 #ETCD_WAL_DIR=""
 97 #ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380"
 98 #ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
 99 #ETCD_MAX_SNAPSHOTS="5"
100 #ETCD_MAX_WALS="5"
101 #ETCD_NAME="etcd_dns_node2"
102 #ETCD_SNAPSHOT_COUNT="100000"
103 #ETCD_HEARTBEAT_INTERVAL="100"
104 #ETCD_ELECTION_TIMEOUT="1000"
105 #ETCD_QUOTA_BACKEND_BYTES="0"
106 #ETCD_MAX_REQUEST_BYTES="1572864"
107 #ETCD_GRPC_KEEPALIVE_MIN_TIME="5s"
108 #ETCD_GRPC_KEEPALIVE_INTERVAL="2h0m0s"
109 #ETCD_GRPC_KEEPALIVE_TIMEOUT="20s"
110 #
111 #[Clustering]
112 #ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.180.11.2:2380"
113 #ETCD_ADVERTISE_CLIENT_URLS="http://10.180.11.2:2379"
114 #ETCD_DISCOVERY=""
115 #ETCD_DISCOVERY_FALLBACK="proxy"
116 #ETCD_DISCOVERY_PROXY=""
117 #ETCD_DISCOVERY_SRV=""
118 #ETCD_INITIAL_CLUSTER="etcd_dns_node1=http://10.180.11.3:2380,etcd_dns_node2=http://10.180.11.2:2380"
119 #ETCD_INITIAL_CLUSTER_TOKEN="etcd-dns-cluster"
120 #ETCD_INITIAL_CLUSTER_STATE="existing"
121 #ETCD_STRICT_RECONFIG_CHECK="true"
122 #ETCD_ENABLE_V2="true"
123 #
124 #[Proxy]
125 #ETCD_PROXY="off"
126 #ETCD_PROXY_FAILURE_WAIT="5000"
127 #ETCD_PROXY_REFRESH_INTERVAL="30000"
128 #ETCD_PROXY_DIAL_TIMEOUT="1000"
129 #ETCD_PROXY_WRITE_TIMEOUT="5000"
130 #ETCD_PROXY_READ_TIMEOUT="0"
131 #
132 #[Security]
133 #ETCD_CERT_FILE=""
134 #ETCD_KEY_FILE=""
135 #ETCD_CLIENT_CERT_AUTH="false"
136 #ETCD_TRUSTED_CA_FILE=""
137 #ETCD_AUTO_TLS="false"
138 #ETCD_PEER_CERT_FILE=""
139 #ETCD_PEER_KEY_FILE=""
140 #ETCD_PEER_CLIENT_CERT_AUTH="false"
141 #ETCD_PEER_TRUSTED_CA_FILE=""
142 #ETCD_PEER_AUTO_TLS="false"
143 #
144 #[Logging]
145 #ETCD_DEBUG="false"
146 #ETCD_LOG_PACKAGE_LEVELS=""
147 #ETCD_LOG_OUTPUT="default"
148 #
149 #[Unsafe]
150 #ETCD_FORCE_NEW_CLUSTER="false"
151 #
152 #[Version]
153 #ETCD_VERSION="false"
154 #ETCD_AUTO_COMPACTION_RETENTION="0"
155 #
156 #[Profiling]
157 #ETCD_ENABLE_PPROF="false"
158 #ETCD_METRICS="basic"
159 #
160 #[Auth]
161 #ETCD_AUTH_TOKEN="simple"
162 [root@node1 ~]#

 

coredns配置

節點1

[root@dns-1 ~]# cat /etc/coredns/Corefile
.:53 {
etcd {
stubzones
path /skydns
endpoint http://10.180.11.3:2379
upstream 114.114.114.114:53 114.114.115.115:53 /etc/resolv.conf 
fallthrough
}
#cache 160
forward . 114.114.114.114:53 114.114.115.115:53 /etc/resolv.conf
log
errors
}
[root@dns-1 ~]#

 節點2

[root@dns-2 ~]# cat /etc/coredns/Corefile
.:53 {
etcd {
stubzones
path /skydns
endpoint http://10.180.11.3:2379
upstream 114.114.114.114:53 114.114.115.115:53 /etc/resolv.conf 
fallthrough
}
#cache 160
forward . 114.114.114.114:53 114.114.115.115:53 /etc/resolv.conf
log
errors
}
[root@dns-2 ~]#

 

coredns注冊成系統服務

在兩個節點將coredns注冊成服務

[root@dns-1 ~]# cat /usr/lib/systemd/system/coredns.service
[Unit]
Description=CoreDNS DNS server
Documentation=https://coredns.io
After=network.target

[Service]
PermissionsStartOnly=true
LimitNOFILE=1048576
LimitNPROC=512
CapabilityBoundingSet=CAP_NET_BIND_SERVICE
AmbientCapabilities=CAP_NET_BIND_SERVICE
NoNewPrivileges=true
User=root
ExecStart=/usr/sbin/coredns -quiet -conf /etc/coredns/Corefile
ExecReload=/bin/kill -SIGUSR1 $MAINPID
Restart=on-failure

[Install]
WantedBy=multi-user.target
[root@dns-1 ~]#

 

配置開機啟動

systemctl enable etcd
systemctl enable coredns

 

配置etcd API 版本為3

 

[root@dns-1 ~]# cat .bash_profile
export ETCDCTL_API=3

 

啟動etcd 和coredns

 

systemctl start etcd
systemctl start coredns

 

etcdct l 命令幫助

 

[root@dns-1 ~]# etcdctl -h
NAME:
etcdctl - A simple command line client for etcd3.

USAGE:
etcdctl

VERSION:
3.3.11

API VERSION:
3.3


COMMANDS:
get Gets the key or a range of keys
put Puts the given key into the store
del Removes the specified key or range of keys [key, range_end)
txn Txn processes all the requests in one transaction
compaction Compacts the event history in etcd
alarm disarm Disarms all alarms
alarm list Lists all alarms
defrag Defragments the storage of the etcd members with given endpoints
endpoint health Checks the healthiness of endpoints specified in `--endpoints` flag
endpoint status Prints out the status of endpoints specified in `--endpoints` flag
endpoint hashkv Prints the KV history hash for each endpoint in --endpoints
move-leader Transfers leadership to another etcd cluster member.
watch Watches events stream on keys or prefixes
version Prints the version of etcdctl
lease grant Creates leases
lease revoke Revokes leases
lease timetolive Get lease information
lease list List all active leases
lease keep-alive Keeps leases alive (renew)
member add Adds a member into the cluster
member remove Removes a member from the cluster
member update Updates a member in the cluster
member list Lists all members in the cluster
snapshot save Stores an etcd node backend snapshot to a given file
snapshot restore Restores an etcd member snapshot to an etcd directory
snapshot status Gets backend snapshot status of a given file
make-mirror Makes a mirror at the destination etcd cluster
migrate Migrates keys in a v2 store to a mvcc store
lock Acquires a named lock
elect Observes and participates in leader election
auth enable Enables authentication
auth disable Disables authentication
user add Adds a new user
user delete Deletes a user
user get Gets detailed information of a user
user list Lists all users
user passwd Changes password of user
user grant-role Grants a role to a user
user revoke-role Revokes a role from a user
role add Adds a new role
role delete Deletes a role
role get Gets detailed information of a role
role list Lists all roles
role grant-permission Grants a key to a role
role revoke-permission Revokes a key from a role
check perf Check the performance of the etcd cluster
help Help about any command

OPTIONS:
--cacert="" verify certificates of TLS-enabled secure servers using this CA bundle
--cert="" identify secure client using this TLS certificate file
--command-timeout=5s timeout for short running command (excluding dial timeout)
--debug[=false] enable client-side debug logging
--dial-timeout=2s dial timeout for client connections
-d, --discovery-srv="" domain name to query for SRV records describing cluster endpoints
--endpoints=[127.0.0.1:2379] gRPC endpoints
--hex[=false] print byte strings as hex encoded strings
--insecure-discovery[=true] accept insecure SRV records describing cluster endpoints
--insecure-skip-tls-verify[=false] skip server certificate verification
--insecure-transport[=true] disable transport security for client connections
--keepalive-time=2s keepalive time for client connections
--keepalive-timeout=6s keepalive timeout for client connections
--key="" identify secure client using this TLS key file
--user="" username[:password] for authentication (prompt if password is not supplied)
-w, --write-out="simple" set the output format (fields, json, protobuf, simple, table)

 

通過etcdctl設置設置key：


(1)添加刪除etcd數據庫中的A記錄

添加記錄命令

etcd put /skydns/com/test1/www/v4 '{"host":"1.1.2.3"}'

 

刪除記錄

[root@dns-1 ~]# etcdctl get / --prefix /skydns/com/test1/www/v4
{"host":"1.1.2.3"}
/skydns/migu/test/www/v4
{"host":"1.1.1.1"}
/skydns/migu/test1/www/v4
{"host":"1.1.2.2"}
[root@dns-1 ~]# etcdctl del /skydns/com/ -p
Error: unknown shorthand flag: 'p' in -p
NAME:
del - Removes the specified key or range of keys [key, range_end)

USAGE:
etcdctl del [options] <key> [range_end]

OPTIONS:
--from-key[=false] delete keys that are greater than or equal to the given key using byte compare
--prefix[=false] delete keys with matching prefix
--prev-kv[=false] return deleted key-value pairs

GLOBAL OPTIONS:
--cacert="" verify certificates of TLS-enabled secure servers using this CA bundle
--cert="" identify secure client using this TLS certificate file
--command-timeout=5s timeout for short running command (excluding dial timeout)
--debug[=false] enable client-side debug logging
--dial-timeout=2s dial timeout for client connections
-d, --discovery-srv="" domain name to query for SRV records describing cluster endpoints
--endpoints=[127.0.0.1:2379] gRPC endpoints
--hex[=false] print byte strings as hex encoded strings
--insecure-discovery[=true] accept insecure SRV records describing cluster endpoints
--insecure-skip-tls-verify[=false] skip server certificate verification
--insecure-transport[=true] disable transport security for client connections
--keepalive-time=2s keepalive time for client connections
--keepalive-timeout=6s keepalive timeout for client connections
--key="" identify secure client using this TLS key file
--user="" username[:password] for authentication (prompt if password is not supplied)
-w, --write-out="simple" set the output format (fields, json, protobuf, simple, table)


[root@dns-1 ~]# etcdctl del /skydns/com/ --prefix 1
[root@dns-1 ~]# etcdctl get / --prefix
/skydns/migu/test/www/v4
{"host":"1.1.1.1"}
/skydns/migu/test1/www/v4
{"host":"1.1.2.2"}
[root@dns-1 ~]# etcdctl del / --prefix
2
[root@dns-1 ~]# etcdctl get / --prefix
[root@dns-1 ~]#

 


　　非常奇怪，兩個節點是集群，在一個節點進行數據的增加刪除，其他節點會同步進行的，但在節點2刪除數據后節點1上的數據還在。在之前集群狀態是正常的，數據也是在一個幾點添加的，后來為了測試 snapshot restore的功能，在做了 snapshot save后刪除了源數據，並進行了 snapshot restore，修改數據文件屬主屬組為etcd，並成功在兩個節點啟動etcd，測試數據已經恢復。所以並沒有查看集群的同步狀態。、因為etcd集群需要超過半數的節點存活，否則整個集群將不可用。

[root@dns-2 ~]# etcdctl get / --prefix
/skydns/com/test1/www/v4
{"host":"1.1.2.3"}
/skydns/migu/test/www/v4
{"host":"1.1.1.1"}
/skydns/migu/test1/www/v4
{"host":"1.1.2.2"}
[root@dns-2 ~]# etcdctl member list
8e9e05c52164694d, started, etcd_dns_node1, http://localhost:2380, http://10.180.11.3:2379
[root@dns-2 ~]# etcdctl endpoint status
127.0.0.1:2379, 8e9e05c52164694d, 3.3.11, 16 kB, true, 2, 4
[root@dns-2 ~]# etcdctl endpoint health
127.0.0.1:2379 is healthy: successfully committed proposal: took = 500.505µs
[root@dns-2 ~]# etcdctl endpoint health --write-out="table"
127.0.0.1:2379 is healthy: successfully committed proposal: took = 503.821µs
[root@dns-2 ~]# etcdctl endpoint health --write-out="table"
127.0.0.1:2379 is healthy: successfully committed proposal: took = 1.066859ms
[root@dns-2 ~]#
[root@dns-2 ~]# etcdctl --write-out="table" endpoint health 127.0.0.1:2379 is healthy: successfully committed proposal: took = 492.012µs
[root@dns-2 ~]#
[root@dns-2 ~]# etcdctl --write-out="table" endpoint status +----------------+------------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+----------------+------------------+---------+---------+-----------+-----------+------------+
| 127.0.0.1:2379 | 8e9e05c52164694d | 3.3.11 | 16 kB | true | 2 | 4 |
+----------------+------------------+---------+---------+-----------+-----------+------------+
[root@dns-2 ~]#
[root@dns-2 ~]# etcdctl --write-out="table" --endpoints=10.180.11.2,10.180.11.3 endpoint status
Error: dial tcp: address 10.180.11.3: missing port in address
[root@dns-2 ~]# etcdctl --write-out="table" --endpoints=10.180.11.2:2379,10.180.11.3:2379 endpoint status +------------------+------------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+------------------+------------------+---------+---------+-----------+-----------+------------+
| 10.180.11.2:2379 | 8e9e05c52164694d | 3.3.11 | 16 kB | true | 2 | 7 |
| 10.180.11.3:2379 | 8e9e05c52164694d | 3.3.11 | 16 kB | true | 2 | 4 |
+------------------+------------------+---------+---------+-----------+-----------+------------+
[root@dns-2 ~]#
[root@dns-2 ~]# etcdctl --write-out="table" --endpoints=10.180.11.2:2379,10.180.11.3:2379 endpoint health 10.180.11.3:2379 is healthy: successfully committed proposal: took = 529.95µs
10.180.11.2:2379 is healthy: successfully committed proposal: took = 472.66

 


那我們重啟一下etcd看看會是什么情況

 

[root@dns-2 ~]# systemctl restart etcd
[root@dns-2 ~]# etcdctl --write-out="table" --endpoints=10.180.11.2:2379,10.180.11.3:2379 endpoint health
10.180.11.2:2379 is healthy: successfully committed proposal: took = 513.726µs
10.180.11.3:2379 is healthy: successfully committed proposal: took = 613.431µs

[root@dns-1 ~]# systemctl restart etcd
[root@dns-1 ~]# etcdctl --write-out="table" --endpoints=10.180.11.2:2379,10.180.11.3:2379 endpoint status
+------------------+------------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+------------------+------------------+---------+---------+-----------+-----------+------------+
| 10.180.11.2:2379 | 8e9e05c52164694d | 3.3.11 | 16 kB | true | 3 | 9 |
| 10.180.11.3:2379 | 8e9e05c52164694d | 3.3.11 | 16 kB | true | 3 | 6 |
+------------------+------------------+---------+---------+-----------+-----------+------------+
[root@dns-1 ~]#

[root@dns-2 ~]# etcdctl --write-out="table" --endpoints=10.180.11.2:2379,10.180.11.3:2379 endpoint status
+------------------+------------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+------------------+------------------+---------+---------+-----------+-----------+------------+
| 10.180.11.2:2379 | 8e9e05c52164694d | 3.3.11 | 16 kB | true | 2 | 7 |
| 10.180.11.3:2379 | 8e9e05c52164694d | 3.3.11 | 16 kB | true | 3 | 6 |
+------------------+------------------+---------+---------+-----------+-----------+------------+
[root@dns-2 ~]# etcdctl member list
8e9e05c52164694d, started, etcd_dns_node1, http://localhost:2380, http://10.180.11.3:2379

 

可以正常重啟，但集群還是分裂的,那我們嘗試在節點2將節點1加入集群，因為兩邊數據不一致，估計不會成功

 

[root@dns-2 ~]# etcdctl member add -h
NAME:
member add - Adds a member into the cluster

USAGE:
etcdctl member add <memberName> [options]

OPTIONS:
--peer-urls="" comma separated peer URLs for the new member.

GLOBAL OPTIONS:
--cacert="" verify certificates of TLS-enabled secure servers using this CA bundle
--cert="" identify secure client using this TLS certificate file
--command-timeout=5s timeout for short running command (excluding dial timeout)
--debug[=false] enable client-side debug logging
--dial-timeout=2s dial timeout for client connections
-d, --discovery-srv="" domain name to query for SRV records describing cluster endpoints
--endpoints=[127.0.0.1:2379] gRPC endpoints
--hex[=false] print byte strings as hex encoded strings
--insecure-discovery[=true] accept insecure SRV records describing cluster endpoints
--insecure-skip-tls-verify[=false] skip server certificate verification
--insecure-transport[=true] disable transport security for client connections
--keepalive-time=2s keepalive time for client connections
--keepalive-timeout=6s keepalive timeout for client connections
--key="" identify secure client using this TLS key file
--user="" username[:password] for authentication (prompt if password is not supplied)
-w, --write-out="simple" set the output format (fields, json, protobuf, simple, table)

[root@dns-2 ~]# etcdctl member add http://10.180.11.2:2380
Error: member peer urls not provided.
[root@dns-2 ~]# etcdctl member add --peer-urls="http://10.180.11.2:2380"
Error: member name not provided.
[root@dns-2 ~]# etcdctl member add etcd-dns-cluster --peer-urls="http://10.180.11.2:2380"
Member 5d81d60b777579ed added to cluster cdf818194e3a8c32

ETCD_NAME="etcd-dns-cluster"
ETCD_INITIAL_CLUSTER="etcd-dns-cluster=http://10.180.11.2:2380,etcd_dns_node1=http://localhost:2380"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.180.11.2:2380"
ETCD_INITIAL_CLUSTER_STATE="existing"
[root@dns-2 ~]#
[root@dns-2 ~]# etcdctl --write-out="table" --endpoints=10.180.11.2:2379,10.180.11.3:2379 endpoint status
+------------------+------------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+------------------+------------------+---------+---------+-----------+-----------+------------+
| 10.180.11.2:2379 | 8e9e05c52164694d | 3.3.11 | 16 kB | true | 3 | 9 |
| 10.180.11.3:2379 | 8e9e05c52164694d | 3.3.11 | 16 kB | false | 3 | 7 |
+------------------+------------------+---------+---------+-----------+-----------+------------+

 

可以看出雖然dns-1已經添加到集群但 節點2的狀態是異常的

 

[root@dns-2 ~]# etcdctl get / --prefix
Error: context deadline exceeded
[root@dns-2 ~]# etcdctl --write-out="table" --endpoints=10.180.11.2:2379,10.180.11.3:2379 endpoint health
10.180.11.2:2379 is healthy: successfully committed proposal: took = 552.875µs
10.180.11.3:2379 is unhealthy: failed to commit proposal: context deadline exceeded
Error: unhealthy cluster
[root@dns-2 ~]#
[root@dns-1 ~]# etcdctl get / --prefix
[root@dns-1 ~]#


我們嘗試下關閉兩個節點etcd，再逐個節點啟動etcd

先啟節點1

[root@dns-1 ~]# systemctl stop etcd
[root@dns-1 ~]# systemctl start etcd
[root@dns-1 ~]# etcdctl get / --prefix
[root@dns-1 ~]# etcdctl --write-out="table" --endpoints=10.180.11.2:2379,10.180.11.3:2379 endpoint status
Failed to get the status of endpoint 10.180.11.3:2379 (context deadline exceeded)
+------------------+------------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+------------------+------------------+---------+---------+-----------+-----------+------------+
| 10.180.11.2:2379 | 8e9e05c52164694d | 3.3.11 | 16 kB | true | 5 | 13 |
+------------------+------------------+---------+---------+-----------+-----------+------------+

 


再啟節點2，節點2etcd無法啟動

[root@dns-2 ~]# systemctl start etcd
Job for etcd.service failed because a timeout was exceeded. See "systemctl status etcd.service" and "journalctl -xe" for details.

 


節點1使用之前創建的快照恢復到和節點2一樣，並重啟etcd

[root@dns-1 ~]# systemctl stop etcd
[root@dns-1 ~]# cd /home/etcd/
[root@dns-1 etcd]# ll
total 0
drwx------ 3 etcd etcd 20 May 28 11:00 data.etcd
drwx------ 3 etcd etcd 20 May 26 19:33 data.etcd.bak
drwxr-x--- 2 root root 36 May 27 11:36 etcd_backup
[root@dns-1 etcd]# mv data.etcd data.etcd.20200528.bak

 

 

[root@dns-1 etcd]# etcdctl snapshot restor -h
NAME:
snapshot restore - Restores an etcd member snapshot to an etcd directory

USAGE:
etcdctl snapshot restore <filename> [options]

OPTIONS:
--data-dir="" Path to the data directory
--initial-advertise-peer-urls="http://localhost:2380" List of this member's peer URLs to advertise to the rest of the cluster
--initial-cluster="default=http://localhost:2380" Initial cluster configuration for restore bootstrap
--initial-cluster-token="etcd-cluster" Initial cluster token for the etcd cluster during restore bootstrap
--name="default" Human-readable name for this member
--skip-hash-check[=false] Ignore snapshot integrity hash value (required if copied from data directory)
--wal-dir="" Path to the WAL directory (use --data-dir if none given)

GLOBAL OPTIONS:
--cacert="" verify certificates of TLS-enabled secure servers using this CA bundle
--cert="" identify secure client using this TLS certificate file
--command-timeout=5s timeout for short running command (excluding dial timeout)
--debug[=false] enable client-side debug logging
--dial-timeout=2s dial timeout for client connections
-d, --discovery-srv="" domain name to query for SRV records describing cluster endpoints
--endpoints=[127.0.0.1:2379] gRPC endpoints
--hex[=false] print byte strings as hex encoded strings
--insecure-discovery[=true] accept insecure SRV records describing cluster endpoints
--insecure-skip-tls-verify[=false] skip server certificate verification
--insecure-transport[=true] disable transport security for client connections
--keepalive-time=2s keepalive time for client connections
--keepalive-timeout=6s keepalive timeout for client connections
--key="" identify secure client using this TLS key file
--user="" username[:password] for authentication (prompt if password is not supplied)
-w, --write-out="simple" set the output format (fields, json, protobuf, simple, table)

 


從快照恢復節點1的數據

[root@dns-1 etcd]# etcdctl snapshot restor /home/etcd/etcd_backup/etcd_20200527113646.db --data-dir="/home/etcd/data.etcd"
2020-05-28 11:09:15.687417 I | etcdserver/membership: added member 8e9e05c52164694d [http://localhost:2380] to cluster cdf818194e3a8c32
[root@dns-1 etcd]#
[root@dns-1 etcd]# ll
total 0
drwx------ 3 root root 20 May 28 11:09 data.etcd
drwx------ 3 etcd etcd 20 May 28 11:00 data.etcd.20200528.bak
drwx------ 3 etcd etcd 20 May 26 19:33 data.etcd.bak
drwxr-x--- 2 root root 36 May 27 11:36 etcd_backup
[root@dns-1 etcd]# chown etcd:etcd data.etcd
[root@dns-1 etcd]# ll
total 0
drwx------ 3 etcd etcd 20 May 28 11:09 data.etcd
drwx------ 3 etcd etcd 20 May 28 11:00 data.etcd.20200528.bak
drwx------ 3 etcd etcd 20 May 26 19:33 data.etcd.bak
drwxr-x--- 2 root root 36 May 27 11:36 etcd_backup
[root@dns-1 etcd]#
[root@dns-1 etcd]# systemctl start etcd        <<==========啟動節點1 etcd  報錯
Job for etcd.service failed because the control process exited with error code. See "systemctl status etcd.service" and "journalctl -xe" for details.
[root@dns-1 etcd]# journalctl -xe
-- The result is failed.
May 28 11:09:56 dns-1.novalocal systemd[1]: Unit etcd.service entered failed state.
May 28 11:09:56 dns-1.novalocal systemd[1]: etcd.service failed.
May 28 11:09:57 dns-1.novalocal systemd[1]: etcd.service holdoff time over, scheduling restart.
May 28 11:09:57 dns-1.novalocal systemd[1]: start request repeated too quickly for etcd.service
May 28 11:09:57 dns-1.novalocal systemd[1]: Failed to start Etcd Server.
-- Subject: Unit etcd.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit etcd.service has failed.
--
-- The result is failed.
May 28 11:09:57 dns-1.novalocal systemd[1]: Unit etcd.service entered failed state.
May 28 11:09:57 dns-1.novalocal systemd[1]: etcd.service failed.
May 28 11:10:01 dns-1.novalocal systemd[1]: Started Session 5722 of user root.
-- Subject: Unit session-5722.scope has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit session-5722.scope has finished starting up.
--
-- The start-up result is done.
May 28 11:10:01 dns-1.novalocal systemd[1]: Starting Session 5722 of user root.
-- Subject: Unit session-5722.scope has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit session-5722.scope has begun starting up.
May 28 11:10:01 dns-1.novalocal CROND[18120]: (root) CMD (/usr/lib64/sa/sa1 1 1)
May 28 11:10:15 dns-1.novalocal sshd[18126]: Connection closed by 127.0.0.1 port 54794 [preauth]
[root@dns-1 etcd]#
[root@dns-1 etcd]# chown etcd:etcd data.etcd -R <<==========修改數據文件權限
[root@dns-1 etcd]#
[root@dns-1 etcd]# systemctl start etcd <<============啟動節點1 etcd ，正常啟動
[root@dns-1 etcd]#
[root@dns-1 etcd]# etcdctl --write-out="table" --endpoints=10.180.11.2:2379,10.180.11.3:2379 endpoint status
Failed to get the status of endpoint 10.180.11.3:2379 (context deadline exceeded)
+------------------+------------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+------------------+------------------+---------+---------+-----------+-----------+------------+
| 10.180.11.2:2379 | 8e9e05c52164694d | 3.3.11 | 16 kB | true | 2 | 4 |
+------------------+------------------+---------+---------+-----------+-----------+------------+
[root@dns-1 etcd]#

 

再啟節點2 

[root@dns-2 ~]# systemctl start etcd
Job for etcd.service failed because a timeout was exceeded. See "systemctl status etcd.service" and "journalctl -xe" for details.

 


關掉node1，節點2 恢復快照重啟並啟動etcd

 

[root@dns-1 etcd]# systemctl stop etcd
[root@dns-2 etcd]# rm -rf data.etcd
[root@dns-2 etcd]#
[root@dns-2 etcd]# ll
total 20
drwx------. 3 etcd etcd 20 May 26 19:14 data.etcd.bak
-rw-r-----. 1 root root 16416 May 27 11:45 etcd_20200527113646.db
[root@dns-2 etcd]#
[root@dns-2 etcd]# etcdctl snapshot restor /home/etcd/etcd_20200527113646.db --data-dir="/home/etcd/data.etcd"
2020-05-28 11:22:06.237276 I | etcdserver/membership: added member 8e9e05c52164694d [http://localhost:2380] to cluster cdf818194e3a8c32
[root@dns-2 etcd]#
[root@dns-2 etcd]# ll
total 20
drwx------. 3 root root 20 May 28 11:22 data.etcd
drwx------. 3 etcd etcd 20 May 26 19:14 data.etcd.bak
-rw-r-----. 1 root root 16416 May 27 11:45 etcd_20200527113646.db
[root@dns-2 etcd]# chown etcd:etcd data.etcd -R
[root@dns-2 etcd]# systemctl start etcd           <<==========節點2 etcd 正常啟動

 


再啟節點1

[root@dns-1 etcd]# systemctl start etcd 
[root@dns-1 etcd]#
[root@dns-1 etcd]# etcdctl --write-out="table" --endpoints=10.180.11.2:2379,10.180.11.3:2379 endpoint status
+------------------+------------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+------------------+------------------+---------+---------+-----------+-----------+------------+
| 10.180.11.2:2379 | 8e9e05c52164694d | 3.3.11 | 16 kB | true | 3 | 6 |
| 10.180.11.3:2379 | 8e9e05c52164694d | 3.3.11 | 16 kB | true | 2 | 4 |
+------------------+------------------+---------+---------+-----------+-----------+------------+
[root@dns-1 etcd]#

 

etcd集群添加節點

 

[root@dns-1 ~]# cat /etc/etcd/etcd.conf |grep -v "#"
ETCD_DATA_DIR="/home/etcd/data.etcd"
ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_NAME="etcd_dns_node2"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.180.11.2:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://10.180.11.2:2379"
ETCD_INITIAL_CLUSTER="etcd_dns_node1=http://10.180.11.3:2380,etcd_dns_node2=http://10.180.11.2:2380,etcd_dns_node3=http://10.180.11.17:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-dns-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
[root@dns-1 ~]#
[root@dns-1 ~]#
[root@dns-1 ~]# etcdctl member add --peer-urls="http://10.180.11.17:2380"
Error: member name not provided.
[root@dns-1 ~]# etcdctl member add etcd_dns_node3 --peer-urls="http://10.180.11.17:2380"
Member 13db2c9d1758b274 added to cluster b45f8b203d965968

ETCD_NAME="etcd_dns_node3"
ETCD_INITIAL_CLUSTER="etcd_dns_node3=http://10.180.11.17:2380,etcd_dns_node1=http://10.180.11.3:2380,etcd_dns_node2=http://10.180.11.2:2380"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.180.11.17:2380"
ETCD_INITIAL_CLUSTER_STATE="existing"
[root@dns-1 ~]#
[root@dns-1 ~]#
[root@dns-1 ~]# etcdctl member list
13db2c9d1758b274, unstarted, , http://10.180.11.17:2380,
2820e5fdaeb09ba6, started, etcd_dns_node1, http://10.180.11.3:2380, http://10.180.11.3:2379
523a2b4083effb13, started, etcd_dns_node2, http://10.180.11.2:2380, http://10.180.11.2:2379

 



啟動新節點

[root@dns-3 ~]# systemctl start etcd
Job for etcd.service failed because the control process exited with error code. See "systemctl status etcd.service" and "journalctl -xe" for details.
[root@dns-3 ~]#
[root@dns-3 ~]#
[root@dns-3 ~]# journalctl -xe
Jul 13 22:23:41 dns-3.novalocal systemd[1]: Failed to start Etcd Server.
-- Subject: Unit etcd.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit etcd.service has failed.
--
-- The result is failed.
Jul 13 22:23:41 dns-3.novalocal systemd[1]: Unit etcd.service entered failed state.
Jul 13 22:23:41 dns-3.novalocal systemd[1]: etcd.service failed.
Jul 13 22:23:41 dns-3.novalocal systemd[1]: etcd.service holdoff time over, scheduling restart.
Jul 13 22:23:41 dns-3.novalocal systemd[1]: Starting Etcd Server...
-- Subject: Unit etcd.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit etcd.service has begun starting up.
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: recognized and used environment variable ETCD_ADVERTISE_CLIENT_URLS=http://10.180.11.17:2379
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: recognized and used environment variable ETCD_INITIAL_ADVERTISE_PEER_URLS=http://10.180.11.17:2380
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: recognized and used environment variable ETCD_INITIAL_CLUSTER=etcd_dns_node1=http://10.180.11.3:2380,etc
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: recognized and used environment variable ETCD_INITIAL_CLUSTER_STATE=existing
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: recognized and used environment variable ETCD_INITIAL_CLUSTER_TOKEN=etcd-dns-cluster
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: recognized and used environment variable ETCD_LISTEN_PEER_URLS=http://0.0.0.0:2380
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: recognized environment variable ETCD_NAME, but unused: shadowed by corresponding flag
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: recognized environment variable ETCD_DATA_DIR, but unused: shadowed by corresponding flag
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: recognized environment variable ETCD_LISTEN_CLIENT_URLS, but unused: shadowed by corresponding flag
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: etcd Version: 3.3.11
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: Git SHA: 2cf9e51
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: Go Version: go1.10.3
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: Go OS/Arch: linux/amd64
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: setting maximum number of CPUs to 4, total number of available CPUs is 4
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: listening for peers on http://0.0.0.0:2380
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: listening for client requests on 0.0.0.0:2379
Jul 13 22:23:41 dns-3.novalocal etcd[12609]: cannot access data directory: mkdir /home/etcd: permission denied
Jul 13 22:23:41 dns-3.novalocal systemd[1]: etcd.service: main process exited, code=exited, status=1/FAILURE
Jul 13 22:23:41 dns-3.novalocal systemd[1]: Failed to start Etcd Server.
-- Subject: Unit etcd.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit etcd.service has failed.
--
-- The result is failed.
Jul 13 22:23:41 dns-3.novalocal systemd[1]: Unit etcd.service entered failed state.
Jul 13 22:23:41 dns-3.novalocal systemd[1]: etcd.service failed.
Jul 13 22:23:41 dns-3.novalocal systemd[1]: etcd.service holdoff time over, scheduling restart.
Jul 13 22:23:41 dns-3.novalocal systemd[1]: start request repeated too quickly for etcd.service
Jul 13 22:23:41 dns-3.novalocal systemd[1]: Failed to start Etcd Server.
-- Subject: Unit etcd.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit etcd.service has failed.
--
-- The result is failed.
Jul 13 22:23:41 dns-3.novalocal systemd[1]: Unit etcd.service entered failed state.
Jul 13 22:23:41 dns-3.novalocal systemd[1]: etcd.service failed.
[root@dns-3 ~]#
[root@dns-3 ~]# grep -v "#" /etc/etcd/etcd.conf
ETCD_DATA_DIR="/home/etcd/data.etcd"
ETCD_LISTEN_PEER_URLS="http://0.0.0.0:2380"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_NAME="etcd_dns_node3"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://10.180.11.17:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://10.180.11.17:2379"
ETCD_INITIAL_CLUSTER="etcd_dns_node1=http://10.180.11.3:2380,etcd_dns_node2=http://10.180.11.2:2380,etcd_dns_node3=http://10.180.11.17:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-dns-cluster"
ETCD_INITIAL_CLUSTER_STATE="existing"
[root@dns-3 ~]# mkdir -p /home/etcd/data.etcd
[root@dns-3 ~]# id etcd
uid=997(etcd) gid=994(etcd) groups=994(etcd)
[root@dns-3 ~]# chown etcd:etcd /home/etcd -R
[root@dns-3 ~]# systemctl start etcd
[root@dns-3 ~]# systemctl status etcd
â— etcd.service - Etcd Server
Loaded: loaded (/usr/lib/systemd/system/etcd.service; disabled; vendor preset: disabled)
Active: active (running) since Mon 2020-07-13 22:25:46 CST; 18s ago
Main PID: 12635 (etcd)
CGroup: /system.slice/etcd.service
└─12635 /usr/bin/etcd --name=etcd_dns_node3 --data-dir=/home/etcd/data.etcd --listen-client-urls=http://0.0.0.0:2379

Jul 13 22:25:46 dns-3.novalocal etcd[12635]: added member 2820e5fdaeb09ba6 [http://10.180.11.3:2380] to cluster b45f8b203d965968
Jul 13 22:25:46 dns-3.novalocal etcd[12635]: added member 523a2b4083effb13 [http://10.180.11.2:2380] to cluster b45f8b203d965968
Jul 13 22:25:46 dns-3.novalocal etcd[12635]: set the initial cluster version to 3.3
Jul 13 22:25:46 dns-3.novalocal etcd[12635]: enabled capabilities for version 3.3
Jul 13 22:25:46 dns-3.novalocal etcd[12635]: added member 13db2c9d1758b274 [http://10.180.11.17:2380] to cluster b45f8b203d965968
Jul 13 22:25:46 dns-3.novalocal etcd[12635]: ready to serve client requests
Jul 13 22:25:46 dns-3.novalocal etcd[12635]: published {Name:etcd_dns_node3 ClientURLs:[http://10.180.11.17:2379]} to cluster b45f8b203d965968
Jul 13 22:25:46 dns-3.novalocal etcd[12635]: serving insecure client requests on [::]:2379, this is strongly discouraged!
Jul 13 22:25:46 dns-3.novalocal systemd[1]: Started Etcd Server.
Jul 13 22:25:46 dns-3.novalocal etcd[12635]: 13db2c9d1758b274 initialzed peer connection; fast-forwarding 8 ticks (election ticks 10) with... peer(s)
Hint: Some lines were ellipsized, use -l to show in full.
[root@dns-3 ~]# etcdctl member list
13db2c9d1758b274, started, etcd_dns_node3, http://10.180.11.17:2380, http://10.180.11.17:2379
2820e5fdaeb09ba6, started, etcd_dns_node1, http://10.180.11.3:2380, http://10.180.11.3:2379
523a2b4083effb13, started, etcd_dns_node2, http://10.180.11.2:2380, http://10.180.11.2:2379
[root@dns-3 ~]#

 

 

 

參考：

http://www.topgoer.com/%E6%95%B0%E6%8D%AE%E5%BA%93%E6%93%8D%E4%BD%9C/go%E6%93%8D%E4%BD%9Cetcd/etcd%E4%BB%8B%E7%BB%8D.html

https://coredns.io/

 


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