docker (centOS 7) 使用筆記4 - etcd服務

本次測試的系統包含centos 7.2 64 bit，centos 7.3 64 bit

1. 安裝

yum -y install etcd

2. 配置

此處一共準備了3臺機器(10.10.10.100, 10.10.10.101, 10.10.10.102) 

(1) etcd服務的配置和啓動方式

啓用etcd服務

systemctl enable etcd

修改服務配置 /etc/systemd/system/multi-user.target.wants/etcd.service，其中的啓動指令(ExecStart=)

修改配置後，裝載配置，重啓服務

systemctl daemon-reload
systemctl restart etcd

啓動成功後，能夠看到新增長了2個監聽端口：2379, 2380

 

(2) 集羣配置

第1個節點(10.10.10.100) (注意：第一次啓動時，--initial-cluster-state new，啓動成功後，集羣已經建立，此時需修改成  --initial-cluster-state existing。不然下次重啓服務會失敗。):

ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /usr/bin/etcd --name=\"etcd0\" --data-dir=\"${ETCD_DATA_DIR}\" --listen-client-urls=\"http://0.0.0.0:2379\" --listen-peer-urls=\"http://0.0.0.0:2380\" --advertise-client-urls=\"http://10.10.10.100:2379\" --initial-advertise-peer-urls=\"http://10.10.10.100:2380\" --initial-cluster-token=\"etcd-cluster-1\" --initial-cluster=\"etcd0=http://10.10.10.100:2380,etcd1=http://10.10.10.101:2380,etcd2=http://10.10.10.102:2380\" --initial-cluster-state new " 

後面的節點能夠先手工添加信息:

etcdctl member add etcd1 http://10.10.10.101:2380
etcdctl member add etcd2 http://10.10.10.102:2380  

第2個節點(10.10.10.101):

ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /usr/bin/etcd --name=\"etcd1\" --data-dir=\"${ETCD_DATA_DIR}\" --listen-client-urls=\"http://0.0.0.0:2379\" --listen-peer-urls=\"http://0.0.0.0:2380\" --advertise-client-urls=\"http://10.10.10.101:2379\" --initial-advertise-peer-urls=\"http://10.10.10.101:2380\" --initial-cluster-token=\"etcd-cluster-1\" --initial-cluster=\"etcd0=http://10.10.10.100:2380,etcd1=http://10.10.10.101:2380,etcd2=http://10.10.10.102:2380\"  " 

第3個節點(10.10.10.102):

ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /usr/bin/etcd --name=\"etcd2\" --data-dir=\"${ETCD_DATA_DIR}\" --listen-client-urls=\"http://0.0.0.0:2379\" --listen-peer-urls=\"http://0.0.0.0:2380\" --advertise-client-urls=\"http://10.10.10.102:2379\" --initial-advertise-peer-urls=\"http://10.10.10.102:2380\" --initial-cluster-token=\"etcd-cluster-1\" --initial-cluster=\"etcd0=http://10.10.10.100:2380,etcd1=http://10.10.10.101:2380,etcd2=http://10.10.10.102:2380\" " 

啓動成功後能夠查看集羣狀態，member 列表

# etcdctl cluster-health
member 17294cb126466d4d is healthy: got healthy result from http://10.10.10.100:2379
member a17abe451cf50cbd is healthy: got healthy result from http://10.10.10.101:2379
member f4a143b3a5f1cdf7 is healthy: got healthy result from http://10.10.10.102:2379
cluster is healthy

# etcdctl member list
17294cb126466d4d: name=etcd2 peerURLs=http://10.10.10.100:2380 clientURLs=http://10.28.148.46:2379 isLeader=false
a17abe451cf50cbd: name=etcd0 peerURLs=http://10.10.10.101:2380 clientURLs=http://10.28.148.61:2379 isLeader=true
f4a143b3a5f1cdf7: name=etcd1 peerURLs=http://10.10.10.102:2380 clientURLs=http://10.28.148.57:2379 isLeader=false