Consul 搭建集群
Consul 是一套开源的分布式服务发现和配置管理系统，由 HashiCorp 公司用 Go 语言开发。
它具有很多优点。包括： 基于raft协议，简洁,支持健康检查, 同时支持HTTP和DNS协议,支持跨数据中心的WAN集群,提供图形界面,跨平台支持 Linux、Mac、Windows。
快速入门
环境准备
首先需要准备好三台虚拟机,由三台虚机组成一个consul集群。
| ip | |
|---|---|
| s1 | 172.20.20.20 |
| s2 | 172.20.20.21 |
| s3 | 172.20.20.22 |
基于Vagrant技术，可以快速的配置出三台虚机。
在命令行输入
» mkdir ms
» cd ms
» vagrant init centos/7编辑Vagrantfile并配置出三台虚机。
# -*- mode: ruby -*-
# vi: set ft=ruby :
Vagrant.configure("2") do |config|
config.vm.box = "centos/7"
config.vm.define "s1" do |s1|
s1.vm.hostname = "s1"
s1.vm.network "private_network", ip: "172.20.20.20"
end
config.vm.define "s2" do |s2|
s2.vm.hostname = "s2"
s2.vm.network "private_network", ip: "172.20.20.21"
end
config.vm.define "s3" do |s3|
s3.vm.hostname = "s3"
s3.vm.network "private_network", ip: "172.20.20.22"
end
end
启动虚机
» vagrant up
Bringing machine 's1' up with 'virtualbox' provider...
Bringing machine 's2' up with 'virtualbox' provider...
Bringing machine 's3' up with 'virtualbox' provider...
==> s1: Importing base box 'centos/7'...
==> s1: Matching MAC address for NAT networking...
==> s1: Setting the name of the VM: ms_s1_1528794737477_2031
==> s1: Clearing any previously set network interfaces...
==> s1: Preparing network interfaces based on configuration...
s1: Adapter 1: nat
s1: Adapter 2: hostonly
==> s1: Forwarding ports...
s1: 22 (guest) => 2222 (host) (adapter 1)
==> s1: Booting VM...
==> s1: Waiting for machine to boot. This may take a few minutes...
s1: SSH address: 127.0.0.1:2222
s1: SSH username: vagrant
s1: SSH auth method: private key
s1:
s1: Vagrant insecure key detected. Vagrant will automatically replace
s1: this with a newly generated keypair for better security.
s1:
s1: Inserting generated public key within guest...
s1: Removing insecure key from the guest if it's present...
s1: Key inserted! Disconnecting and reconnecting using new SSH key...
==> s1: Machine booted and ready!
==> s1: Checking for guest additions in VM...
s1: No guest additions were detected on the base box for this VM! Guest
s1: additions are required for forwarded ports, shared folders, host only
s1: networking, and more. If SSH fails on this machine, please install
s1: the guest additions and repackage the box to continue.
s1:
s1: This is not an error message; everything may continue to work properly,
s1: in which case you may ignore this message.
==> s1: Setting hostname...
==> s1: Configuring and enabling network interfaces...
s1: SSH address: 127.0.0.1:2222
s1: SSH username: vagrant
s1: SSH auth method: private key
==> s1: Rsyncing folder: /work/training/vagrant/ms/ => /vagrant
==> s2: Importing base box 'centos/7'...
==> s2: Matching MAC address for NAT networking...
==> s2: Setting the name of the VM: ms_s2_1528794795606_2999
==> s2: Fixed port collision for 22 => 2222. Now on port 2200.
==> s2: Clearing any previously set network interfaces...
==> s2: Preparing network interfaces based on configuration...
s2: Adapter 1: nat
s2: Adapter 2: hostonly
==> s2: Forwarding ports...
s2: 22 (guest) => 2200 (host) (adapter 1)
==> s2: Booting VM...
==> s2: Waiting for machine to boot. This may take a few minutes...
s2: SSH address: 127.0.0.1:2200
s2: SSH username: vagrant
s2: SSH auth method: private key
s2:
s2: Vagrant insecure key detected. Vagrant will automatically replace
s2: this with a newly generated keypair for better security.
s2:
s2: Inserting generated public key within guest...
s2: Removing insecure key from the guest if it's present...
s2: Key inserted! Disconnecting and reconnecting using new SSH key...
==> s2: Machine booted and ready!
==> s2: Checking for guest additions in VM...
s2: No guest additions were detected on the base box for this VM! Guest
s2: additions are required for forwarded ports, shared folders, host only
s2: networking, and more. If SSH fails on this machine, please install
s2: the guest additions and repackage the box to continue.
s2:
s2: This is not an error message; everything may continue to work properly,
s2: in which case you may ignore this message.
==> s2: Setting hostname...
==> s2: Configuring and enabling network interfaces...
s2: SSH address: 127.0.0.1:2200
s2: SSH username: vagrant
s2: SSH auth method: private key
==> s2: Rsyncing folder: /work/training/vagrant/ms/ => /vagrant
==> s3: Importing base box 'centos/7'...
==> s3: Matching MAC address for NAT networking...
==> s3: Setting the name of the VM: ms_s3_1528794863986_43122
==> s3: Fixed port collision for 22 => 2222. Now on port 2201.
==> s3: Clearing any previously set network interfaces...
==> s3: Preparing network interfaces based on configuration...
s3: Adapter 1: nat
s3: Adapter 2: hostonly
==> s3: Forwarding ports...
s3: 22 (guest) => 2201 (host) (adapter 1)
==> s3: Booting VM...
==> s3: Waiting for machine to boot. This may take a few minutes...
s3: SSH address: 127.0.0.1:2201
s3: SSH username: vagrant
s3: SSH auth method: private key
s3:
s3: Vagrant insecure key detected. Vagrant will automatically replace
s3: this with a newly generated keypair for better security.
s3:
s3: Inserting generated public key within guest...
s3: Removing insecure key from the guest if it's present...
s3: Key inserted! Disconnecting and reconnecting using new SSH key...
==> s3: Machine booted and ready!
==> s3: Checking for guest additions in VM...
s3: No guest additions were detected on the base box for this VM! Guest
s3: additions are required for forwarded ports, shared folders, host only
s3: networking, and more. If SSH fails on this machine, please install
s3: the guest additions and repackage the box to continue.
s3:
s3: This is not an error message; everything may continue to work properly,
s3: in which case you may ignore this message.
==> s3: Setting hostname...
==> s3: Configuring and enabling network interfaces...
s3: SSH address: 127.0.0.1:2201
s3: SSH username: vagrant
s3: SSH auth method: private key
==> s3: Rsyncing folder: /work/training/vagrant/ms/ => /vagrant至此3台待测试的虚机就准备完成了
单机安装
登录到虚机s1,切换用户到root
» vagrant ssh s1
[vagrant@s1 ~]$ su
Password:
[root@s1 vagrant]#安装一些依赖的工具
[root@s1 vagrant]# yum install -y epel-release
[root@s1 vagrant]# yum install -y jq
[root@s1 vagrant]# yum install -y unzip下载1.1.0版本到/tmp目录下
[root@s1 vagrant]# cd /tmp/
[root@s1 tmp]# curl -s https://releases.hashicorp.com/consul/1.1.0/consul_1.1.0_linux_amd64.zip -o consul.zip解压，并赋予consul可执行权限，最后把consul移动到/usr/bin/下
[root@s1 tmp]unzip consul.zip
[root@s1 tmp]chmod +x consul
[root@s1 tmp]mv consul /usr/bin/consul检查consul是否安装成功
[root@s1 tmp]# consul
Usage: consul [--version] [--help] []
Available commands are:
agent Runs a Consul agent
catalog Interact with the catalog
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
kv Interact with the key-value store
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
operator Provides cluster-level tools for Consul operators
reload Triggers the agent to reload configuration files
rtt Estimates network round trip time between nodes
snapshot Saves, restores and inspects snapshots of Consul server state
validate Validate config files/directories
version Prints the Consul version
watch Watch for changes in Consul 出现如上所示代表安装成功。
批量安装
这里只是s1虚机安装完成，还有s2和s3需要再次的安装，比较费事。还好 Vagrant 提供了一个 shell 脚本的支持。
稍微对Vagrantfile文件做的修改，在第4行增加script脚本的定义
$script = <