CentOS7 ETCD叢集安裝

##1.安裝軟體

本次安裝

####配置規劃

名稱	IP
etcd01	172.16.25.187
etcd02	172.16.25.188
etcd03	172.16.25.189

####安裝

安裝etcd方式有很多種，在CentOS7可以選擇最簡單的方式

yum install etcd

####檢視版本

etcd --version

etcd Version: 3.2.22
Git SHA: 1674e68
Go Version: go1.9.4
Go OS/Arch: linux/amd64
           

##2、配置

####修改服務啟動配置

nano /usr/lib/systemd/system/etcd.service

[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
EnvironmentFile=-/etc/etcd/etcd.conf
User=etcd
# set GOMAXPROCS to number of processors
ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /usr/bin/etcd --name=\"${ETCD_NAME}\" --data-dir=\"${ETCD_DATA_DIR}\" --initial-advertise-peer-urls=\"${ETCD_INITIAL_ADVERTISE_PEER_URLS}\" --listen-peer-urls=\"${ETCD_LISTEN_PEER_URLS}\" --listen-client-urls=\"${ETCD_LISTEN_CLIENT_URLS}\" --advertise-client-urls=\"${ETCD_ADVERTISE_CLIENT_URLS}\" --initial-cluster-token=\"${ETCD_INITIAL_CLUSTER_TOKEN}\" --initial-cluster=\"${ETCD_INITIAL_CLUSTER}\" --initial-cluster-state=\"${ETCD_INITIAL_CLUSTER_STATE}\" "
#主要修改這一行，增加叢集的參數，要注意變量名稱要和配置檔案一緻

Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
           

####修改配置檔案

nano /etc/etcd/etcd.conf

第1台

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="http://172.16.25.187:2380"
ETCD_LISTEN_CLIENT_URLS="http://172.16.25.187:2379,http://127.0.0.1:2379"
ETCD_NAME="etcd01"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://etcd01:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://etcd01:2379,http://localhost:2379"

ETCD_INITIAL_CLUSTER="etcd01=http://etcd01:2380,etcd02=http://etcd02:2380,etcd03=http://etcd03:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
           

第2台

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="http://172.16.25.188:2380"
ETCD_LISTEN_CLIENT_URLS="http://172.16.25.188:2379,http://127.0.0.1:2379"
ETCD_NAME="etcd02"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://etcd02:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://etcd02:2379,http://localhost:2379"

ETCD_INITIAL_CLUSTER="etcd01=http://etcd01:2380,etcd02=http://etcd02:2380,etcd03=http://etcd03:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
           

第3台

ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="http://172.16.25.189:2380"
ETCD_LISTEN_CLIENT_URLS="http://172.16.25.189:2379,http://127.0.0.1:2379"
ETCD_NAME="etcd03"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://etcd03:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://etcd03:2379,http://localhost:2379"

ETCD_INITIAL_CLUSTER="etcd01=http://etcd01:2380,etcd02=http://etcd02:2380,etcd03=http://etcd03:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
           

##啟動伺服器

####打開防火牆端口

firewall-cmd --zone=public --add-port=2379/tcp --permanent
firewall-cmd --zone=public --add-port=2380/tcp --permanent
firewall-cmd --reload
           

####啟動etcd伺服器

systemctl start etcd.service
           

####檢視叢集啟動狀态

etcdctl member list
           

####檢視叢集健康狀态

etcdctl cluster-healt