docker怎么部署etcd集群

本篇內容介紹了“docker怎么部署etcd集群”的有關知識，在實際案例的操作過程中，不少人都會遇到這樣的困境，接下來就讓小編帶領大家學習一下如何處理這些情況吧！希望大家仔細閱讀，能夠學有所成！

需要安裝：

• docker

• docker-compose

參數詳細：

• –name：設置成員節點的別名，建議為每個成員節點配置可識別的命名

• –advertise-client-urls：廣播到集群中本成員的監聽客戶端請求的地址

• –initial-advertise-peer-urls：廣播到集群中本成員的Peer監聽通信地址

• –listen-client-urls：客戶端請求的監聽地址列表

• –listen-peer-urls：Peer消息的監聽服務地址列表

• –initial-cluster-token：啟動集群的時候指定集群口令，只有相同token的幾點才能加入到同一集群

• –initial-cluster：所有集群節點的地址列表

• –initial-cluster-state：初始化集群狀態，默認為new，也可以指定為exi-string表示要加入到一個已有集群

創建etcd數據目錄

mkdir -p ./etcd-node{1,2,3}

創建docker網絡

docker network create --driver bridge --subnet 172.62.0.0/16 --gateway 172.62.0.1 etcd-cluster

etcd-cluster-compose.yml

version: '3'

networks:
  etcd-cluster:
    external: true

services:
  etcd-node1:
    image: quay.io/coreos/etcd:v3.3.1
    container_name: etcd-node1
    ports:
      - "12379:2379"
      - "12380:2380"
    restart: always
    volumes:
      - ./etcd-node1:/data/app/etcd
    command: etcd --name etcd-node1 --data-dir /data/app/etcd/ --advertise-client-urls http://172.62.0.10:2379 --initial-advertise-peer-urls http://172.62.0.10:2380 --listen-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-cluster-token etcd-cluster --initial-cluster "etcd-node1=http://172.62.0.10:2380,etcd-node2=http://172.62.0.11:2380,etcd-node3=http://172.62.0.12:2380" --initial-cluster-state new
    networks:
      etcd-cluster:
        ipv4_address: 172.62.0.10

  etcd-node2:
    image: quay.io/coreos/etcd:v3.3.1
    container_name: etcd-node2
    ports:
      - "22379:2379"
      - "22380:2380"
    restart: always
    volumes:
      - ./etcd-node2:/data/app/etcd
    command: etcd --name etcd-node2 --data-dir /data/app/etcd/ --advertise-client-urls http://172.62.0.11:2379 --initial-advertise-peer-urls http://172.62.0.11:2380 --listen-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-cluster-token etcd-cluster --initial-cluster "etcd-node1=http://172.62.0.10:2380,etcd-node2=http://172.62.0.11:2380,etcd-node3=http://172.62.0.12:2380" --initial-cluster-state new
    networks:
      etcd-cluster:
        ipv4_address: 172.62.0.11

  etcd-node3:
    image: quay.io/coreos/etcd:v3.3.1
    container_name: etcd-node3
    ports:
      - "32379:2379"
      - "32380:2380"
    restart: always
    volumes:
      - ./etcd-node3:/data/app/etcd
    command: etcd --name etcd-node3 --data-dir /data/app/etcd/ --advertise-client-urls http://172.62.0.12:2379 --initial-advertise-peer-urls http://172.62.0.12:2380 --listen-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-cluster-token etcd-cluster --initial-cluster "etcd-node1=http://172.62.0.10:2380,etcd-node2=http://172.62.0.11:2380,etcd-node3=http://172.62.0.12:2380" --initial-cluster-state new
    networks:
      etcd-cluster:
        ipv4_address: 172.62.0.12

啟動并驗證集群

啟動

[root@k8s-node1 etcd-cluster]# docker-compose -f etcd-cluster-compose.yml up -d
Pulling etcd-node1 (quay.io/coreos/etcd:v3.3.1)...
v3.3.1: Pulling from coreos/etcd
ff3a5c916c92: Pull complete
dec5fcc85a18: Pull complete
3944f16f0112: Pull complete
0b6d29b049fe: Pull complete
d8c39ae91d38: Pull complete
42fcea4864ba: Pull complete
Digest: sha256:454e69370d87554dcb4272833b8f07ce1b5d457caa153bda4070b76d89a1cc97
Status: Downloaded newer image for quay.io/coreos/etcd:v3.3.1
Creating etcd-node1 ... done
Creating etcd-node2 ... done
Creating etcd-node3 ... done

[root@k8s-node1 etcd-cluster]# docker-compose -f etcd-cluster-compose.yml ps -a
   Name                 Command               State                        Ports
------------------------------------------------------------------------------------------------------
etcd-node1   etcd --name etcd-node1 --d ...   Up      0.0.0.0:12379->2379/tcp, 0.0.0.0:12380->2380/tcp
etcd-node2   etcd --name etcd-node2 --d ...   Up      0.0.0.0:22379->2379/tcp, 0.0.0.0:22380->2380/tcp
etcd-node3   etcd --name etcd-node3 --d ...   Up      0.0.0.0:32379->2379/tcp, 0.0.0.0:32380->2380/tcp

驗證集群

通過etcdctl member list命令可以查詢出所有集群節點的列表并且結果一致即為成功

[root@k8s-node1 etcd-cluster]# docker exec -it  etcd-node1 /bin/sh
/ # etcdctl member list
8cef47d732d4acff: name=etcd-node1 peerURLs=http://172.62.0.10:2380 clientURLs=http://172.62.0.10:2379 isLeader=false
c93af917b643516f: name=etcd-node3 peerURLs=http://172.62.0.12:2380 clientURLs=http://172.62.0.12:2379 isLeader=true
cdee7114ad135065: name=etcd-node2 peerURLs=http://172.62.0.11:2380 clientURLs=http://172.62.0.11:2379 isLeader=false
/ # exit
[root@k8s-node1 etcd-cluster]# docker exec -it  etcd-node2 /bin/sh
/ # etcdctl member list
8cef47d732d4acff: name=etcd-node1 peerURLs=http://172.62.0.10:2380 clientURLs=http://172.62.0.10:2379 isLeader=false
c93af917b643516f: name=etcd-node3 peerURLs=http://172.62.0.12:2380 clientURLs=http://172.62.0.12:2379 isLeader=true
cdee7114ad135065: name=etcd-node2 peerURLs=http://172.62.0.11:2380 clientURLs=http://172.62.0.11:2379 isLeader=false
[root@k8s-node1 etcd-cluster]# docker exec -it  etcd-node3 /bin/sh
/ # etcdctl member list
8cef47d732d4acff: name=etcd-node1 peerURLs=http://172.62.0.10:2380 clientURLs=http://172.62.0.10:2379 isLeader=false
c93af917b643516f: name=etcd-node3 peerURLs=http://172.62.0.12:2380 clientURLs=http://172.62.0.12:2379 isLeader=true
cdee7114ad135065: name=etcd-node2 peerURLs=http://172.62.0.11:2380 clientURLs=http://172.62.0.11:2379 isLeader=false

k/v操作

CURL

新增

[root@k8s-node1 etcd-cluster]# docker-compose -f etcd-cluster-compose.yml ps -a
   Name                 Command               State                        Ports
------------------------------------------------------------------------------------------------------
etcd-node1   etcd --name etcd-node1 --d ...   Up      0.0.0.0:12379->2379/tcp, 0.0.0.0:12380->2380/tcp
etcd-node2   etcd --name etcd-node2 --d ...   Up      0.0.0.0:22379->2379/tcp, 0.0.0.0:22380->2380/tcp
etcd-node3   etcd --name etcd-node3 --d ...   Up      0.0.0.0:32379->2379/tcp, 0.0.0.0:32380->2380/tcp
[root@k8s-node1 etcd-cluster]# curl -L http://127.0.0.1:12379/version
{"etcdserver":"3.3.1","etcdcluster":"3.3.0"}[root@k8s-node1 etcd-cluster]#
[root@k8s-node1 etcd-cluster]# curl -L http://127.0.0.1:12379/v2/keys/Alexclownfish -X PUT -d value=https://blog.alexcld.com
{"action":"set","node":{"key":"/Alexclownfish","value":"https://blog.alexcld.com","modifiedIndex":19,"createdIndex":19}}

查詢

[root@k8s-node1 etcd-cluster]# curl -L http://127.0.0.1:12379/v2/keys/Alexclownfish -X GET
{"action":"get","node":{"key":"/Alexclownfish","value":"https://blog.alexcld.com","modifiedIndex":19,"createdIndex":19}}
[root@k8s-node1 etcd-cluster]# curl -L http://127.0.0.1:22379/v2/keys/Alexclownfish -X GET
{"action":"get","node":{"key":"/Alexclownfish","value":"https://blog.alexcld.com","modifiedIndex":19,"createdIndex":19}}
[root@k8s-node1 etcd-cluster]# curl -L http://127.0.0.1:32379/v2/keys/Alexclownfish -X GET
{"action":"get","node":{"key":"/Alexclownfish","value":"https://blog.alexcld.com","modifiedIndex":19,"createdIndex":19}}

修改

同新建一樣

刪除

[root@k8s-node1 etcd-cluster]# curl -L http://127.0.0.1:12379/v2/keys/Alexclownfish -X DELETE
{"action":"delete","node":{"key":"/Alexclownfish","modifiedIndex":20,"createdIndex":19},"prevNode":{"key":"/Alexclownfish","value":"https://blog.alexcld.com","modifiedIndex":19,"createdIndex":19}}
[root@k8s-node1 etcd-cluster]# curl -L http://127.0.0.1:12379/v2/keys/Alexclownfish -X GET
{"errorCode":100,"message":"Key not found","cause":"/Alexclownfish","index":20}

etcdctl

新增

/ # etcdctl set clownfish 1234567
1234567
/ # etcdctl get clownfish
1234567

查詢

/ # etcdctl get clownfish
1234567

修改

/ # etcdctl get clownfish
1234567
/ # etcdctl set clownfish 987654321ddd
987654321ddd
/ # etcdctl get clownfish
987654321ddd

刪除

/ # etcdctl rm clownfish
PrevNode.Value: 987654321ddd
/ # etcdctl get clownfish
Error:  100: Key not found (/clownfish) [23]

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