keepalived检测Nginx高可用-Toy模板网

这篇具有很好参考价值的文章主要介绍了keepalived检测Nginx高可用。希望对大家有所帮助。如果存在错误或未考虑完全的地方，请大家不吝赐教，您也可以点击"举报违法"按钮提交疑问。

node1 192.168.136.55

node2 192.168.136.56

两台机器都安装dnf install keepalived nginx

[root@node1 ~]# echo "web test page, ip is `hostname -I`." > /usr/share/nginx/html/index.html 
[root@node2 ~]# echo "web test page, ip is `hostname -I`." > /usr/share/nginx/html/index.html

主的配置

[root@node1 ~]# vim /etc/keepalived/keepalived.conf 
global_defs {
    router_id Nginx1
}

vrrp_instance Nginx {
    state MASTER
    interface ens160
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.136.100
    }
}

从的配置

[root@node2 ~]# vim /etc/keepalived/keepalived.conf 
global_defs {
    router_id Nginx2
}

vrrp_instance Nginx {
    state BACKUP
    interface ens160
    virtual_router_id 51
    priority 80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.136.100
    }
}

[root@node1 ~]# systemctl start keepalived.service 
[root@node2 ~]# systemctl start keepalived.service

测试访问虚拟IP 访问的是master

keepalived检测Nginx高可用,nginx,负载均衡,keepalive

当master的keepalived停掉

keepalived检测Nginx高可用,nginx,负载均衡,keepalive

访问的是backup

keepalived检测Nginx高可用,nginx,负载均衡,keepalive

健康检查Nginx的状态

目前 Keepalived 仅能通过主机是否宕机来进行业务切换，如果仅 Nginx 业务出现故障是无法切换的，需在 Keepalive 中添加健康检查来达到检测 Nginx 是否可用的目的。

[root@openEuler-node1 ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
    router_id Nginx1
}

vrrp_script chk_ngx{
    script "killall -0 nginx"
    interval 1
}

vrrp_instance Nginx {
    state MASTER
    interface ens160
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }

    track_script {
        chk_ngx
    }

    virtual_ipaddress {
        192.168.136.100
    }
}

node2上修改类似 killall -0 nginx 一刀切直接切换

[root@openEuler-node2 ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
    router_id Nginx2
}

vrrp_script chk_ngx{
    script "killall -0 nginx"
    interval 1
}

vrrp_instance Nginx {
    state BACKUP
    interface ens160
    virtual_router_id 51
    priority 80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }

    track_script {
        chk_ngx
    }

    virtual_ipaddress {
        192.168.136.100
    }
}

当MATSER的nginx停掉之后

keepalived检测Nginx高可用,nginx,负载均衡,keepalive

当检测到nginx异常，然后停止keepalive，VIP漂移

1、检测到web服务异常

2、重启web

3、启动不了，再VIP漂移

更改配置文件

node1 和Node2一样

keepalived检测Nginx高可用,nginx,负载均衡,keepalive

vim /etc/keepalived/chk_ngx.sh
#!/bin.bash
systemctl status nginx | grep "active (running)" > /dev/null
if [ $? -ne 0 ]; then
    systemctl restart nginx &> /dev/null
    sleep 1
    systemctl status nginx | grep "active (running)" > /dev/null
    if [ $? -ne 0 ]; then
      systemctl stop keepalived
    else
      exit
  fi
fi
[root@openEuler-node1 ~]# chmod +x /etc/keepalived/chk_ngx.sh

检验1 将node1上nginx stop了

keepalived检测Nginx高可用,nginx,负载均衡,keepalive