saltstack自动化部署keepalived高可用集群

首先先简单了解一下Keepalived

• Keepalived是Linux下一个轻量级别的高可用解决方案。

• Keepalived是基于vrrp协议的一款高可用软件。

• Keepailived有一台主服务器和多台备份服务器，在主服务器和备份服务器上面部署相同的服务配置，使用一个虚拟IP地址对外提供服务，当主服务器出现故障时，虚拟IP地址会自动漂移到备份服务器。

实现saltstack自动化部署keepalived高可用集群

1.在/srv/salt目录下创建keepalived

[root@server1 ~]# cd /srv/salt/
[root@server1 salt]# ls
apache  _grains  keepalived  nginx  top.sls
[root@server1 salt]# mkdir keepalived

2.配置install.sls

[root@server1 salt]# cd keepalived/
[root@server1 keepalived]# vim install.sls 
kp-install:
  pkg.installed:
    - pkgs:
      - keepalived

  file.managed:
    - name: /etc/keepalived/keepalived.conf
    - source: salt://keepalived/files/keepalived.conf
    - template: jinja
    - context:
        STATE: {{ pillar['state'] }}
        VRID: {{ pillar['vrid'] }}
        PRIORITY: {{ pillar['priority'] }}

  service.running:
    - name: keepalived
    - enable: true
    - reload: true
    - watch:
      - file: kp-install

3.在/srv/salt/keepalived目录创建files

[root@server1 keepalived]# mkdir files

4.将keepalived.conf配置文件放到/srv/salt/keepalived/files

[root@server2 ~]# yum install -y keepalived.x86_64 
[root@server2 ~]# scp /etc/keepalived/keepalived.conf server1:/srv/salt/keepalived/files/
root@server1's password: 
keepalived.conf                               100% 3562     3.5KB/s   00:00 

5.配置keepalived.conf

[root@server1 keepalived]# cd files/
[root@server1 files]# vim keepalived.conf 
! Configuration File for keepalived

global_defs {
   notification_email {
        root@localhost
   }
   notification_email_from keepalived@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state {{ STATE }}
    interface eth0
    virtual_router_id {{ VRID }}
    priority {{ PRIORITY  }}
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.25.13.100
    }
}

6.配置pillar

[root@server1 files]# vim /srv/pillar/web/vars.sls 
{% if grains['fqdn'] == 'server2' %}
webserver: httpd
state: MASTER
vrid: 100
priority: 100
ip: 172.25.13.2
port: 80
{% elif grains['fqdn'] == 'server3' %}
webserver: nginx
state: BACKUP
vrid: 100
priority: 50
ip: 172.25.13.3
port: 80
{% endif %}

7.推送

[root@server1 keepalived]# salt server2 state.sls keepalived.install
[root@server1 keepalived]# salt server3 state.sls keepalived.install

8.高级推送

[root@server1 salt]# vim top.sls 
base:
  'server2':
    - keepalived.install
    - apache.service
  'server3':
    - keepalived.install
    - nginx.service
[root@server1 salt]# salt '*' state.highstate

9.VIP此时在server2，因为server2的优先级高

10.server2关闭keepalived.service

[root@server2 files]# systemctl stop keepalived.service 

11.VIP漂移到server3上


12.重新推送

[root@server1 salt]# salt '*' state.highstate

因为server2的优先级高于server3，所以VIP重新漂移到server2