etcd介绍，以及适用场景，参考：http://www.infoq.com/cn/articles/etcd-interpretation-application-scenario-implement-principle

etcd的项目：https://github.com/coreos/etcd/releases/tag/v3.2.10   并且下载最新版本etcd

环境：

master：192.168.101.14，node1：192.168.101.15，node2：192.168.101.19

1、在三个节点上下载etcd-v3.2.10-linux-amd64.tar.gz，并提供etcd命令，具体操作如下

[root@docker ~]# tar xf etcd-v3.2.10-linux-amd64.tar.gz

[root@docker ~]# cd etcd-v3.2.10-linux-amd64

[root@docker etcd-v3.2.10-linux-amd64]# cp etcd etcdctl /usr/local/bin/

2、在三个节点上创建etcd数据目录：

# mkdir -p /var/lib/etcd

3、在每个节点上创建etcd的systemd unit文件/usr/lib/systemd/system/etcd.service

master节点：

[root@docker ~]# cat /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

ExecStart=/usr/local/bin/etcd --name master --initial-advertise-peer-urls http://192.168.101.14:2380 --listen-peer-urls http://192.168.101.14:2380 --listen-client-urls http://192.168.101.14:2379,http://127.0.0.1:2379 --advertise-client-urls http://192.168.101.14:2379 --initial-cluster-token etcd-cluster-1 --initial-cluster master=http://192.168.101.14:2380,node1=http://192.168.101.15:2380,node2=http://192.168.101.19:2380 --initial-cluster-state new --data-dir=/var/lib/etcd

Restart=on-failure

RestartSec=

LimitNOFILE=

[Install]

WantedBy=multi-user.target
node1节点：

[root@localhost ~]# cat /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

ExecStart=/usr/local/bin/etcd --name node1 --initial-advertise-peer-urls http://192.168.101.15:2380 --listen-peer-urls http://192.168.101.15:2380 --listen-client-urls http://192.168.101.15:2379,http://127.0.0.1:2379 --advertise-client-urls http://192.168.101.15:2379 --initial-cluster-token etcd-cluster-1 --initial-cluster master=http://192.168.101.14:2380,node1=http://192.168.101.15:2380,node2=http://192.168.101.19:2380 --initial-cluster-state new --data-dir=/var/lib/etcd

Restart=on-failure

RestartSec=

LimitNOFILE=

[Install]

WantedBy=multi-user.target
node2节点：

[root@localhost ~]# cat /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

ExecStart=/usr/local/bin/etcd --name node2 --initial-advertise-peer-urls http://192.168.101.19:2380 --listen-peer-urls http://192.168.101.19:2380 --listen-client-urls http://192.168.101.19:2379,http://127.0.0.1:2379 --advertise-client-urls http://192.168.101.19:2379 --initial-cluster-token etcd-cluster-1 --initial-cluster master=http://192.168.101.14:2380,node1=http://192.168.101.15:2380,node2=http://192.168.101.19:2380 --initial-cluster-state new --data-dir=/var/lib/etcd

Restart=on-failure

RestartSec=

LimitNOFILE=

[Install]

WantedBy=multi-user.target

由于并没有配置TSL认证，所以都是http而不是https，etcd客户端监听在2379，服务端监听在2380

三个节点配置完成了服务文件，于是加载该文件并启动服务：

# systemctl daemon-reload

# systemctl enable etcd

# systemctl start etcd

# systemctl status etcd

查看三个节点的状态：

[root@docker ~]# systemctl status etcd

● etcd.service - etcd server

   Loaded: loaded (/usr/lib/systemd/system/etcd.service; enabled; vendor preset: disabled)

   Active: active (running) since Thu -- :: CST; 12s ago

 Main PID:  (etcd)

   CGroup: /system.slice/etcd.service

           └─ /usr/local/bin/etcd --name master --initial-advertise-peer-urls http://192.168.101.14:2380 --listen-peer-urls http://192.168.101....

Nov  :: docker etcd[]: enabled capabilities for version 3.0

Nov  :: docker etcd[]: health check for peer 192d36c71643c39d could not connect: dial tcp 192.168.101.19:: getsockopt: con...n refused

Nov  :: docker etcd[]: peer 192d36c71643c39d became active

Nov  :: docker etcd[]: established a TCP streaming connection with peer 192d36c71643c39d (stream Message writer)

Nov  :: docker etcd[]: established a TCP streaming connection with peer 192d36c71643c39d (stream MsgApp v2 writer)

Nov  :: docker etcd[]: established a TCP streaming connection with peer 192d36c71643c39d (stream MsgApp v2 reader)

Nov  :: docker etcd[]: established a TCP streaming connection with peer 192d36c71643c39d (stream Message reader)

Nov  :: docker etcd[]: updating the cluster version from 3.0 to 3.2

Nov  :: docker etcd[]: updated the cluster version from 3.0 to 3.2

Nov  :: docker etcd[]: enabled capabilities for version 3.2

Hint: Some lines were ellipsized, use -l to show in full.
[root@localhost ~]# systemctl status etcd

● etcd.service - etcd server

   Loaded: loaded (/usr/lib/systemd/system/etcd.service; enabled; vendor preset: disabled)

   Active: active (running) since Thu -- :: CST; 15s ago

 Main PID:  (etcd)

   CGroup: /system.slice/etcd.service

           └─ /usr/local/bin/etcd --name node1 --initial-advertise-peer-urls http://192.168.101.15:2380 --listen-peer-urls http://192.168.101.1...

Nov  :: localhost.localdomain systemd[]: Started etcd server.

Nov  :: localhost.localdomain etcd[]: set the initial cluster version to 3.0

Nov  :: localhost.localdomain etcd[]: enabled capabilities for version 3.0

Nov  :: localhost.localdomain etcd[]: peer 192d36c71643c39d became active

Nov  :: localhost.localdomain etcd[]: established a TCP streaming connection with peer 192d36c71643c39d (stream Message writer)

Nov  :: localhost.localdomain etcd[]: established a TCP streaming connection with peer 192d36c71643c39d (stream MsgApp v2 reader)

Nov  :: localhost.localdomain etcd[]: established a TCP streaming connection with peer 192d36c71643c39d (stream MsgApp v2 writer)

Nov  :: localhost.localdomain etcd[]: established a TCP streaming connection with peer 192d36c71643c39d (stream Message reader)

Nov  :: localhost.localdomain etcd[]: updated the cluster version from 3.0 to 3.2

Nov  :: localhost.localdomain etcd[]: enabled capabilities for version 3.2
[root@localhost ~]# systemctl status etcd

● etcd.service - etcd server

   Loaded: loaded (/usr/lib/systemd/system/etcd.service; enabled; vendor preset: disabled)

   Active: active (running) since Thu -- :: CST; 17s ago

 Main PID:  (etcd)

   CGroup: /system.slice/etcd.service

           └─ /usr/local/bin/etcd --name node2 --initial-advertise-peer-urls http://192.168.101.19:2380 --listen-peer-urls http://192.168.101.1...

Nov  :: localhost.localdomain etcd[]: dialing to target with scheme: ""

Nov  :: localhost.localdomain etcd[]: could not get resolver for scheme: ""

Nov  :: localhost.localdomain etcd[]: serving insecure client requests on 127.0.0.1:, this is strongly discouraged!

Nov  :: localhost.localdomain etcd[]: ready to serve client requests

Nov  :: localhost.localdomain etcd[]: dialing to target with scheme: ""

Nov  :: localhost.localdomain etcd[]: could not get resolver for scheme: ""

Nov  :: localhost.localdomain etcd[]: serving insecure client requests on 192.168.101.19:, this is strongly discouraged!

Nov  :: localhost.localdomain systemd[]: Started etcd server.

Nov  :: localhost.localdomain etcd[]: updated the cluster version from 3.0 to 3.2

Nov  :: localhost.localdomain etcd[]: enabled capabilities for version 3.2

没有报错问题后查看集群中的成员，任意节点执行就行：

[root@docker ~]# etcdctl member list

192d36c71643c39d: name=node2 peerURLs=http://192.168.101.19:2380 clientURLs=http://192.168.101.19:2379 isLeader=false

5f3835545a5f41e4: name=master peerURLs=http://192.168.101.14:2380 clientURLs=http://192.168.101.14:2379 isLeader=true

77c1ac60c5100363: name=node1 peerURLs=http://192.168.101.15:2380 clientURLs=http://192.168.101.15:2379 isLeader=false

可以看见集群中自动推选了一个节点作为leader，然后查看集群健康状态：

[root@docker ~]# etcdctl cluster-health

member 192d36c71643c39d is healthy: got healthy result from http://192.168.101.19:2379

member 5f3835545a5f41e4 is healthy: got healthy result from http://192.168.101.14:2379

member 77c1ac60c5100363 is healthy: got healthy result from http://192.168.101.15:2379

cluster is healthy

使用etcd进行操作数据：

[root@docker ~]# etcdctl set name wadeson

wadeson

在node1、node2节点上进行查看：

[root@localhost ~]# etcdctl get name

wadeson
[root@localhost ~]# etcdctl get name

wadeson

下面也是查看集群健康状态的一种：

[root@docker ~]# curl http://192.168.101.14:2379/health

{"health": "true"}[root@docker ~]# curl http://192.168.101.15:2379/health

{"health": "true"}[root@docker ~]# curl http://192.168.101.19:2379/health

{"health": "true"}

4、对etcd集群中的member进行操作：

4.1、更新advertise client urls

　　直接修改参数--advertise-client-urls或者ETCD_ADVERTISE_CLIENT_URLS，然后重启该member

4.2、更新advertise peer urls：

　　$ etcdctl member update 192d36c71643c39d http://192.168.101.15:2380

　　更新要修改的peer urls的member id和peer urls，然后重启member
 4.3、移除集群中的某一个节点member：
首先查看member列表：
[root@docker ~]# etcdctl member list

192d36c71643c39d: name=node2 peerURLs=http://192.168.101.19:2380 clientURLs=http://192.168.101.19:2379 isLeader=false

5f3835545a5f41e4: name=master peerURLs=http://192.168.101.14:2380 clientURLs=http://192.168.101.14:2379 isLeader=true

77c1ac60c5100363: name=node1 peerURLs=http://192.168.101.15:2380 clientURLs=http://192.168.101.15:2379 isLeader=false

现在将node2也就是192.168.101.19这个节点移除该集群：

[root@docker ~]# etcdctl member remove 192d36c71643c39d

Removed member 192d36c71643c39d from cluster

[root@docker ~]# etcdctl member list

5f3835545a5f41e4: name=master peerURLs=http://192.168.101.14:2380 clientURLs=http://192.168.101.14:2379 isLeader=true

77c1ac60c5100363: name=node1 peerURLs=http://192.168.101.15:2380 clientURLs=http://192.168.101.15:2379 isLeader=false

集群针对的操作是对member_id进行操作

4.4、向集群增加一个member，现在集群只有两个member：

[root@docker ~]# etcdctl member list

5f3835545a5f41e4: name=master peerURLs=http://192.168.101.14:2380 clientURLs=http://192.168.101.14:2379 isLeader=true

77c1ac60c5100363: name=node1 peerURLs=http://192.168.101.15:2380 clientURLs=http://192.168.101.15:2379 isLeader=false

现在向该集群增加一个member，也就是增加一个节点：

[root@docker ~]# etcdctl member add node2 http://192.168.101.19:2380

Added member named node2 with ID 4edc521f6598ba03 to cluster

ETCD_NAME="node2"

ETCD_INITIAL_CLUSTER="node2=http://192.168.101.19:2380,master=http://192.168.101.14:2380,node1=http://192.168.101.15:2380"

ETCD_INITIAL_CLUSTER_STATE="existing"

然后安装提示操作：

[root@docker ~]# export ETCD_NAME="node2"

[root@docker ~]# export ETCD_INITIAL_CLUSTER="node2=http://192.168.101.19:2380,master=http://192.168.101.14:2380,node1=http://192.168.101.15:2380"

[root@docker ~]# export ETCD_INITIAL_CLUSTER_STATE="existing"
[root@docker ~]# etcd --listen-client-urls http://192.168.101.19:2379 --advertise-client-urls http://192.168.101.19:2379 --listen-peer-urls http://192.168.101.19:2380 --initial-advertise-peer-urls http://192.168.101.19:2380 --data-dir %data_dir%

-- ::33.649640 I | pkg/flags: recognized and used environment variable ETCD_INITIAL_CLUSTER=node2=http://192.168.101.19:2380,master=http://192.168.101.14:2380,node1=http://192.168.101.15:2380

-- ::33.649694 I | pkg/flags: recognized and used environment variable ETCD_INITIAL_CLUSTER_STATE=existing

-- ::33.649706 I | pkg/flags: recognized and used environment variable ETCD_NAME=node2

-- ::33.649748 I | etcdmain: etcd Version: 3.2.

-- ::33.649752 I | etcdmain: Git SHA: 694728c

-- ::33.649754 I | etcdmain: Go Version: go1.8.5

-- ::33.649757 I | etcdmain: Go OS/Arch: linux/amd64

-- ::33.649760 I | etcdmain: setting maximum number of CPUs to , total number of available CPUs is

-- ::33.649850 C | etcdmain: listen tcp 192.168.101.19:: bind: cannot assign requested address

不知道为何最后绑定不到192.168.101.19上，这里是一个问题。。。。。。。待后面解决

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