環境準備

作業系統：CentOS7

搭建一個三節點的etcd集群

機器名:etcd01 IP地址:192.168.154.133

機器名:etcd03 IP地址:192.168.154.145

機器名:etcd04 IP地址:192.168.154.146

etcd包下載安裝

1、下載

https://github.com/etcd-io/etcd/releases/download/v3.3.1/etcd-v3.3.1-linux-amd64.tar.gz

2.復制二進制命令到/usr/local/bin

#解壓軟體包
tar -zxvf etcd-v3.3.1-linux-amd64.tar.gz

#將命令復制進環境
cd etcd-v3.3.1-linux-amd64
cp etcd etcdctl /usr/local/bin/

3.在三個節點中創建資料目錄

#創建資料存盤路徑
mkdir -p /var/lib/etcd

4.在每個節點上創建etcd的systemd unit檔案

vim /usr/lib/systemd/system/etcd.service #如果沒有system目錄則新創建一個

三個節點配置如下：注意IP地址相關配置

etcd01

#etcd01節點

[Unit]
Description=etcd server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
ExecStart=/usr/local/bin/etcd --name etcd01 --initial-advertise-peer-urls http://192.168.154.133:2380 --listen-peer-urls http://192.168.154.133:2380 --listen-cli
ent-urls http://192.168.154.133:2379,http://127.0.0.1:2379 --advertise-client-urls http://192.168.154.133:2379 --initial-cluster-token etcd-cluster-1 --initial-c
luster etcd03=http://192.168.154.145:2380,etcd04=http://192.168.154.146:2380,etcd01=http://192.168.154.133:2380  --initial-cluster-state new --data-dir=/var/lib/
etcd

Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

etcd03節點

vim /usr/lib/systemd/system/etcd.service #如果沒有system目錄則新創建一個

#etcd03節點

[Unit]
Description=etcd server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
ExecStart=/usr/local/bin/etcd --name etcd03 --initial-advertise-peer-urls http://192.168.154.145:2380 --listen-peer-urls http://192.168.154.145:2380 --listen-cli
ent-urls http://192.168.154.145:2379,http://127.0.0.1:2379 --advertise-client-urls http://192.168.154.145:2379 --initial-cluster-token etcd-cluster-1 --initial-c
luster etcd03=http://192.168.154.145:2380,etcd04=http://192.168.154.146:2380,etcd01=http://192.168.154.133:2380  --initial-cluster-state new --data-dir=/var/lib/
etcd

Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

etcd04節點

vim /usr/lib/systemd/system/etcd.service #如果沒有system目錄則新創建一個

#etcd04節點

[Unit]
Description=etcd server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
ExecStart=/usr/local/bin/etcd --name etcd04 --initial-advertise-peer-urls http://192.168.154.146:2380 --listen-peer-urls http://192.168.154.146:2380 --listen-cli
ent-urls http://192.168.154.146:2379,http://127.0.0.1:2379 --advertise-client-urls http://192.168.154.146:2379 --initial-cluster-token etcd-cluster-1 --initial-c
luster etcd03=http://192.168.154.145:2380,etcd04=http://192.168.154.146:2380,etcd01=http://192.168.154.133:2380  --initial-cluster-state new --data-dir=/var/lib/
etcd

Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

4.開啟etcd服務：三個節點分別執行

systemctl daemon-reload && systemctl enable etcd && systemctl start etcd

5.相關查看命令

systemctl status etcd.service #查看運行狀態

# 節點的服務運行狀態

● etcd.service - etcd server
   Loaded: loaded (/usr/lib/systemd/system/etcd.service; enabled; vendor preset: disabled)
   Active: active (running) since 三 2022-01-19 18:17:23 CST; 1h 29min ago
 Main PID: 4190 (etcd)
   Memory: 13.8M
   CGroup: /system.slice/etcd.service
           └─4190 /usr/local/bin/etcd --name etcd04 --initial-advertise-peer-urls http://192.168.154.146:2380 --listen-peer-urls http://192.168.154.146:2380 -...

1月 19 18:17:23 etcd04 etcd[4190]: serving insecure client requests on 192.168.154.146:2379, this is strongly discouraged!
1月 19 18:17:23 etcd04 etcd[4190]: set the initial cluster version to 3.0
1月 19 18:17:23 etcd04 etcd[4190]: enabled capabilities for version 3.0
1月 19 18:17:24 etcd04 etcd[4190]: peer f5cee01588336622 became active
1月 19 18:17:24 etcd04 etcd[4190]: established a TCP streaming connection with peer f5cee01588336622 (stream Message writer)
1月 19 18:17:24 etcd04 etcd[4190]: established a TCP streaming connection with peer f5cee01588336622 (stream MsgApp v2 writer)
1月 19 18:17:24 etcd04 etcd[4190]: established a TCP streaming connection with peer f5cee01588336622 (stream Message reader)
1月 19 18:17:24 etcd04 etcd[4190]: established a TCP streaming connection with peer f5cee01588336622 (stream MsgApp v2 reader)
1月 19 18:17:27 etcd04 etcd[4190]: updated the cluster version from 3.0 to 3.3
1月 19 18:17:27 etcd04 etcd[4190]: enabled capabilities for version 3.3

etcdctl member list #查看集群中各個節點

#查看集群各節點

[root@etcd01 etcd]# etcdctl member list                      
23795efc1fd09208: name=etcd01 peerURLs=http://192.168.154.133:2380 clientURLs=http://192.168.154.133:2379 isLeader=true
5789f6b3099dcd29: name=etcd04 peerURLs=http://192.168.154.146:2380 clientURLs=http://192.168.154.146:2379 isLeader=false
f5cee01588336622: name=etcd03 peerURLs=http://192.168.154.145:2380 clientURLs=http://192.168.154.145:2379 isLeader=false

etcdctl cluster-health #查看集群的健康情況

[root@etcd01 etcd]# etcdctl cluster-health
member 23795efc1fd09208 is healthy: got healthy result from http://192.168.154.133:2379
member 5789f6b3099dcd29 is healthy: got healthy result from http://192.168.154.146:2379
member f5cee01588336622 is healthy: got healthy result from http://192.168.154.145:2379

【架構師面試題庫1】—etcd高可用集群搭建

環境準備

etcd包下載安裝

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