etcd集群搭建步骤

etcd集群搭建步骤（三台虚拟机集群）

• 1.环境准备：cenOS(linux)系统的电脑，最好使用虚拟机；已安装了git，go等

• 2.安装etcd ：yum install etcd （默认放在/etc目录下）（我的版本是3.1.3，可以使用etcd –version命令查看版本号）

• 3.启动etcd服务：etcd

• 4.测试是否安装成功 : 执行 etcdctl set key 6 命令，etcdctl get key 是否得到6.

  以上是单点etcd的搭建，接下来集群搭建

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  执行命令 vim /etc/etcd/etcd.conf ，修改etecd.conf

提示: etcd-3.x版本支持yaml和json两种配置文件格式，配置模板见https://github.com/coreos/etcd/blob/master/etcd.conf.yml.sample

#Human-readable name for this member.
name: 'etcd1'    // 建议起名字

# Path to the data directory.
data-dir: "/var/lib/etcd/etcd0.etcd"   //一般是这个，可也以使用默认 "/var/lib/etcd/default.etcd"

# Path to the dedicated wal directory.
wal-dir:

# Number of committed transactions to trigger a snapshot to disk.
snapshot-count: 10000

# Time (in milliseconds) of a heartbeat interval.
heartbeat-interval: 100

# Time (in milliseconds) for an election to timeout.
election-timeout: 1000

# Raise alarms when backend size exceeds the given quota. 0 means use the
# default quota.
quota-backend-bytes: 0

# List of comma separated URLs to listen on for peer traffic.
listen-peer-urls: http://192.168.0.117:2380  //操作电脑ip

# List of comma separated URLs to listen on for client traffic.
listen-client-urls: http://192.168.0.117:2379   //操作电脑ip

# Maximum number of snapshot files to retain (0 is unlimited).
max-snapshots: 5

# Maximum number of wal files to retain (0 is unlimited).
max-wals: 5

# Comma-separated white list of origins for CORS (cross-origin resource sharing).
cors:

# List of this member's peer URLs to advertise to the rest of the cluster.
# The URLs needed to be a comma-separated list.
initial-advertise-peer-urls: http://192.168.0.117:2380

# List of this member's client URLs to advertise to the public.//操作电脑ip
# The URLs needed to be a comma-separated list.
advertise-client-urls: http://192.168.0.117:2379  //操作电脑ip

# Discovery URL used to bootstrap the cluster.
discovery:

# Valid values include 'exit', 'proxy'
discovery-fallback: 'proxy'

# HTTP proxy to use for traffic to discovery service.
discovery-proxy:

# DNS domain used to bootstrap initial cluster.
discovery-srv:

# Initial cluster configuration for bootstrapping.
initial-cluster: "etcd1=http://192.168.0.117:2380,etcd2=http://192.168.0.119:2380,etcd3=http://192.168.0.120:2380"                  //要集群的机子的IP，与前面起的名字一致

# Initial cluster token for the etcd cluster during bootstrap.
initial-cluster-token: 'etcd-cluster'     //集群token ，三台机子一样

# Initial cluster state ('new' or 'existing').
initial-cluster-state: 'new'    //集群状态为  new/existing  第一次new

# Reject reconfiguration requests that would cause quorum loss.
strict-reconfig-check: false

# Accept etcd V2 client requests
enable-v2: true

# Valid values include 'on', 'readonly', 'off'
proxy: 'off'

# Time (in milliseconds) an endpoint will be held in a failed state.
proxy-failure-wait: 5000

# Time (in milliseconds) of the endpoints refresh interval.
proxy-refresh-interval: 30000

# Time (in milliseconds) for a dial to timeout.
proxy-dial-timeout: 1000

# Time (in milliseconds) for a write to timeout.
proxy-write-timeout: 5000

# Time (in milliseconds) for a read to timeout.
proxy-read-timeout: 0

client-transport-security:
  # DEPRECATED: Path to the client server TLS CA file.
  ca-file:

  # Path to the client server TLS cert file.
  cert-file:

  # Path to the client server TLS key file.
  key-file:

  # Enable client cert authentication.
  client-cert-auth: false

  # Path to the client server TLS trusted CA key file.
  trusted-ca-file:

  # Client TLS using generated certificates
  auto-tls: false

peer-transport-security:
  # DEPRECATED: Path to the peer server TLS CA file.
  ca-file:

  # Path to the peer server TLS cert file.
  cert-file:

  # Path to the peer server TLS key file.
  key-file:

  # Enable peer client cert authentication.
  client-cert-auth: false

  # Path to the peer server TLS trusted CA key file.
   trusted-ca-file:

  # Peer TLS using generated certificates.
  auto-tls: false

# Enable debug-level logging for etcd.
debug: false

# Specify a particular log level for each etcd package (eg: 'etcdmain=CRITICAL,etcdserver=DEBUG'.
log-package-levels:

# Force to create a new one member cluster.
force-new-cluster: false

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使用修改得配置文件启动服务（根据 etcd –h来查找命令）0etcd - -config-file /etc/etcd/etcd.conf 三台机子一样
查看member list是否集群成功
etcdctl -peers 192.168.0.117:2379 member list 查询机子的ip

表示集群成功，进行数据测试。
在leader机上，设值 ，看follow是否能得到值
leader设值命令 ：etcdctl –endpoints http://192.168.0.117:2379 set j 2
follow得值： etcdctl –endpoints http://192.168.0.119:2379 get j

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备注：
查看日志journalctl -xe
查看etcd启动的状态 ps -ef|grep etcd
显示隐藏文件ls -la
etcd命令：etcd –help(仔细看)