nginx高可用集群的实现过程

[root@topcheer dev]# yum install keepalived -y
已加载插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: mirrors.cn99.com
 * epel: ftp.riken.jp
 * extras: mirrors.cn99.com
 * updates: mirror.lzu.edu.cn
gitlab_gitlab-ce/x86_64/signature                                         | 836 B 00:00:00
gitlab_gitlab-ce/x86_64/signature                                         | 1.0 kB 00:00:00 !!!
gitlab_gitlab-ce-source/signature                                         | 836 B 00:00:00
gitlab_gitlab-ce-source/signature                                         | 951 B 00:00:00 !!!
正在解决依赖关系
--> 正在检查事务
---> 软件包 keepalived.x86_64.0.1.3.5-16.el7 将被 安装
--> 正在处理依赖关系 libnetsnmpmibs.so.31()(64bit)，它被软件包 keepalived-1.3.5-16.el7.x86_64 需要
--> 正在处理依赖关系 libnetsnmpagent.so.31()(64bit)，它被软件包 keepalived-1.3.5-16.el7.x86_64 需要
--> 正在检查事务
---> 软件包 net-snmp-agent-libs.x86_64.1.5.7.2-43.el7 将被 安装
--> 解决依赖关系完成
​
依赖关系解决
​
==========================================================================================================================================
 Package                 架构            版本                源             大小
==========================================================================================================================================
正在安装:
 keepalived                x86_64           1.3.5-16.el7            base           331 k
为依赖而安装:
 net-snmp-agent-libs           x86_64           1:5.7.2-43.el7           base           706 k
​
事务概要
==========================================================================================================================================
安装 1 软件包 (+1 依赖软件包)
​
总下载量：1.0 M
安装大小：3.0 M
Downloading packages:
(1/2): net-snmp-agent-libs-5.7.2-43.el7.x86_64.rpm                                 | 706 kB 00:00:00
(2/2): keepalived-1.3.5-16.el7.x86_64.rpm                                     | 331 kB 00:00:00
------------------------------------------------------------------------------------------------------------------------------------------
总计                                                   1.8 MB/s | 1.0 MB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
 正在安装  : 1:net-snmp-agent-libs-5.7.2-43.el7.x86_64                                       1/2
 正在安装  : keepalived-1.3.5-16.el7.x86_64                                            2/2
 验证中   : keepalived-1.3.5-16.el7.x86_64                                            1/2
 验证中   : 1:net-snmp-agent-libs-5.7.2-43.el7.x86_64                                       2/2
​
已安装:
 keepalived.x86_64 0:1.3.5-16.el7
​
作为依赖被安装:
 net-snmp-agent-libs.x86_64 1:5.7.2-43.el7
​
完毕！

[root@topcheer keepalived]# cat keepalived.conf
global_defs {
  notification_email {
  acassen@firewall.loc
  failover@firewall.loc
  sysadmin@firewall.loc
  }
  notification_email_from Alexandre.Cassen@firewall.loc
  smtp_server 192.168.180.113
  smtp_connect_timeout 30
  router_id LVS_DEVEL
  }
  vrrp_script chk_http_port {
  script "/usr/local/src/nginx_check.sh"
  interval 2 #（检测脚本执行的间隔）
  weight 2
  }
  vrrp_instance VI_1 {
   state BACKUP # 备份服务器上将 MASTER 改为 BACKUP
   interface ens33 //网卡
   virtual_router_id 51 # 主、备机的 virtual_router_id 必须相同
   priority 40 # 主、备机取不同的优先级，主机值较大，备份机值较小
   advert_int 1
  authentication {
   auth_type PASS
   auth_pass 1111
  }
  virtual_ipaddress {
  192.168.180.114 // VRRP H 虚拟地址
  }
}

[root@topcheer src]# cat nginx_check.sh
#!/bin/bash
A=`ps -C nginx ▒Cno-header |wc -l`
if [ $A -eq 0 ];then
  /usr/local/nginx/sbin/nginx
  sleep 2
  if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
    killall keepalived
  fi
fi[root@topcheer src]#