Nginx的HA高可用的搭建的实现

yum install -y keepalived 

global_defs {
    notification_email {
      acassen@firewall.loc
      failover@firewall.loc
      sysadmin@firewall.loc
    }
    notification_email_from Alexandre.Cassen@firewall.loc
    # ip的地址
    smtp_ server 192.168.111.188  // 改为自己的ip
    smtp_connect_timeout 30
    router_id 192.168.111.188 // 改为自己的ip
}
# 执行脚本
vrrp_script chk_http_port {
    script "/usr/local/src/nginx_check.sh"
    interval 2  # 每2s执行一次该脚本
    weight -20  # keepalive宕机  权重-20 优先级
}

vrrp_instance VI_1 {
    state MASTER # 角色
    interface ens33 # 网卡名
    virtual_router_id 51 # id 保证主从相同
    priority 100  # 优先级 主节点大于从节点
    advert_int 1
    authentication {
        auth type PASS
        auth pass 1111
        }
    virtual_ipaddress { 
        192.168.111.50 # 虚拟ip. 使用逗号隔开
    }
    track_script {
         chk_http_port # 追踪nginx脚本
    }
    
}

global_defs {
    notification_email {
      acassen@firewall.loc
      failover@firewall.loc
      sysadmin@firewall.loc
    }
    notification_email_from Alexandre.Cassen@firewall.loc
    # ip的地址
    smtp_ server 192.168.111.189
    smtp_connect_timeout 30
    router_id 192.168.111.189
}
# 执行脚本
vrrp_script chk_http_port {
    script "/usr/local/src/nginx_check.sh"
    interval 2  # 每2s执行一次该脚本
    weight -20  # keepalive宕机  权重-20 优先级
}

vrrp_instance VI_1 {
    state BACKUP # 角色
    interface ens33 # 网卡名
    virtual_router_id 51 # id 保证主从相同
    priority 90  # 优先级 主节点大于从节点
    advert_int 1
    authentication {
        auth type PASS
        auth pass 1111
        }
    virtual_ipaddress { 
        192.168.111.50 # 虚拟ip. 使用逗号隔开
    }
    track_script {
         chk_http_port # 追踪nginx脚本
    }
    
}

#!/bin/bash
# 检查是否开启nginx---统计nginx进程的个数
A=`ps -C nginx --no-header |wc -l`
if [ $A -eq 0 ];then
        pkill -9 keepalived
fi

nginx         
keepalived    systemctl start|stop keepalived