docker如何部署etcd集群
需要安裝：
dockerdocker-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，隻有相同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
啟動並驗證集群
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並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]
總結
以上為個人經驗，希望能給大傢一個參考，也希望大傢多多支持WalkonNet。
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