consul包含多个组件,从整体上看可以理解为一个服务发现、配置的工具,包含一下几个特点:
服务发现(Service Discovery):客户端通过consul提供服务,其他客户端可以通过consul利用dns或者http发现依赖服务
健康检查(Health Checking): consul提供任务的健康检查,可以用来操作或者监控集群的健康,也可以在服务发现时去除失效的服务
键值对存储(Key/Value Store): 存储层级键值对
多数据中心(Multi Datacenter): consul支持开箱即用的多数据中心
1.下载consul安装包并解压
wget https://releases.hashicorp.com/consul/0.6.4/consul_0.6.4_linux_amd64.zip
unzip consul_0.6.4_linux_amd64.zip
解压后得到可执行的二进制文件,执行./consul
得到
usage: consul [--version] [--help] []
Available commands are:
agent Runs a Consul agent
configtest Validate config file
event Fire a new event
exec Executes a command on Consul nodes
force-leave Forces a member of the cluster to enter the "left" state
info Provides debugging information for operators
join Tell Consul agent to join cluster
keygen Generates a new encryption key
keyring Manages gossip layer encryption keys
leave Gracefully leaves the Consul cluster and shuts down
lock Execute a command holding a lock
maint Controls node or service maintenance mode
members Lists the members of a Consul cluster
monitor Stream logs from a Consul agent
reload Triggers the agent to reload configuration files
rtt Estimates network round trip time between nodes
version Prints the Consul version
watch Watch for changes in Consul
表示consul成功安装,同时将consul
所在目录配置到path
,例如这里consul
在software
努力下,进行如下配置
vim ~/.bash_profile
export GOROOT=/software/go
export GOPATH=/root/work
PATH=$PATH:$HOME/bin:$GOROOT/bin:/software
export PATH
source ~/.bash_profile
首先下载web-ui
wget https://releases.hashicorp.com/consul/0.6.4/consul_0.6.4_web_ui.zip
通过下面命令启动consul
consul agent -server -bootstrap-expect 1 -data-dir /tmp/consul -advertise 120.76.145.187 -client 120.76.145.187 -ui-dir /software/consul-ui
server
表示启动的为consul server ,构建一个consul cluster 一般建议使用3或者5个consul server
bootstrap-expect 1
表示期望的服务节点数目为1
-data-dir
数据目录,如果该文件夹不存在则手工创建,如果在consul发生错误后,建议先清理该目录文件
advertise
设置广播地址,ip可以设置为公网ip
client
设置client访问的地址
ui-dir
web控制台目录位置
注意 通过advertise
client
才能在WAN上访问consul,否则只能在LAN内访问.
官方给出的快捷启动为 consul agent -dev
如果想简单体验一下可以使用该命令
启动后访问http://ip:8500/ui
得到如下界面
获取consul server集群中的成员列表
consul members
consul members --rpc-addr=ip:8400
Node Address Status Type Build Protocol DC
iZ94235juoyZ 120.76.145.187:8301 alive server 0.6.4 2 dc1
curl 120.76.145.187:8500/v1/catalog/nodes
返回结果:
[{"Node":"iZ94235juoyZ","Address":"120.76.145.187","TaggedAddresses":{"wan":"120.76.145.187"},"CreateIndex":3,"ModifyIndex":4}]
dig @120.76.145.187 -p 8600 iZ94235juoyZ.node.consul
返回结果:
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6 <<>> @120.76.145.187 -p 8600 iZ94235juoyZ.node.consul
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 625
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;iZ94235juoyZ.node.consul. IN A
;; ANSWER SECTION:
iZ94235juoyZ.node.consul. 0 IN A 120.76.145.187
;; Query time: 0 msec
;; SERVER: 120.76.145.187#8600(120.76.145.187)
;; WHEN: Wed Jun 1 21:24:31 2016
;; MSG SIZE rcvd: 82
ok ~ it’s work ! more about is here
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http://blog.csdn.net/liaokailin/article/details/51559228
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