38.Etcd安装配置

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wget
https://github.com/etcd-io/etcd/releases/download/v3.4.13/etcd-v3.4.13-linux-amd64.tar.gz

##解压:
mkdir /usr/local/etcd
tar xzvf etcd-v3.4.13-linux-amd64.tar.gz -C /usr/local/etcd --strip-components=1


###查看版本###
/usr/local/etcd/etcd --version

###前台启动###
/usr/local/etcd/etcd

###另开shell窗口测试###
ETCDCTL_API=3 /usr/local/etcd/etcdctl --endpoints=localhost:2379 put foo bar
ETCDCTL_API=3 /usr/local/etcd/etcdctl --endpoints=localhost:2379 get foo

###修改默认版本,集群中的其他节点也需要修改###
vi /etc/profile
export ETCDCTL_API=3

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###节点名称###
name: etcd-node1

###指定节点的数据存储目录,这些数据包括节点ID,集群ID,集群初始化配置,Snapshot文件,若未指定-wal-dir,还会存储WAL文件;如果不指定会用缺省目录.###
data-dir: /usr/local/etcd/data

###本member侧使用,用于监听etcd客户发送信息的地址.ip为全0代表监听本member侧所有接口###
listen-client-urls: http://0.0.0.0:2379

###本member侧使用,用于监听其他member发送信息的地址.ip为全0代表监听本member侧所有接口###
listen-peer-urls: http://0.0.0.0:2380

####其他member使用,其他member通过该地址与本member交互信息.一定要保证从其他member能可访问该地址.静态配置方式下,该参数的value一定要同时在--initial-cluster参数中存在#####
initial-advertise-peer-urls: http://10.0.67.15:2380

###本member侧使用.描述集群中所有节点的信息,本member根据此信息去联系其他member.###
###memberID的生成受--initial-cluster-token和--initial-advertise-peer-urls影响.###
initial-cluster: etcd-node1=http://10.0.67.15:2380,etcd-node2=http://10.0.67.19:2380,etcd-node3=http://10.0.67.21:2380

###etcd客户使用,客户通过该地址与本member交互信息.一定要保证从客户侧能可访问该地址###
advertise-client-urls: http://10.0.67.15:2379


###用于区分不同集群.本地如有多个集群要设为不同####
initial-cluster-token: etcd-cluster-token


###用于指示本次是否为新建集群.有两个取值new和existing.如果填为existing,则该member启动时会尝试与其他member交互###
###集群初次建立时,要填为new,经尝试最后一个节点填existing也正常,其他节点不能填为existing.###
###集群运行过程中,一个member故障后恢复时填为existing,经尝试填为new也正常.####
initial-cluster-state: new

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

[Service]
Type=notify
WorkingDirectory=/usr/local/etcd/
# User=etcd
ExecStart=/usr/local/etcd/etcd --config-file=/usr/local/etcd/conf.yml
Restart=on-failure

[Install]
WantedBy=multi-user.target

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systemctl daemon-reload
systemctl enable etcd
systemctl start etcd

###10.0.67.19,10.0.67.21这两台服务器需要修改conf.yml对应的ip和名称,注册成服务

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###指令参数###
/usr/local/etcd/etcdctl -h

###查看集群成员###
/usr/local/etcd/etcdctl member list

###集群状态###
/usr/local/etcd/etcdctl cluster-health

#### etcd v3 版本使用grpc替代
http协议,目前http是beta,不建议使用####

###增/改###
/usr/local/etcd/etcdctl put foo bar

####foo is 'Zm9v' in Base64 bar is 'YmFy'###
curl -L http://127.0.0.1:2379/v3beta/kv/put -X POST -d '{"key":"Zm9v","value": "YmFy"}'

###查###
/usr/local/etcd/etcdctl get foo

curl -L http://127.0.0.1:2379/v3beta/kv/range -X POST -d '{"key":"Zm9v"}'

###删####
/usr/local/etcd/etcdctl del foo

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###最全面的文档###
/usr/local/etcd/etcdctl -h

###快照###
/usr/local/etcd/etcdctl snapshot save ./my.db
/usr/local/etcd/etcdctl --write-out=table snapshot status ./my.db
/usr/local/etcd/etcdctl --write-out=table snapshot restore ./my.db