CentOS 7 下 Keepalived + Nginx 实现双机高可用-Toy模板网

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CentOS 7 下 Keepalived + Nginx 实现双机高可用

服务器准备

服务信息

主机名	IP	角色	其他
my-web01	192.168.157.31	nginx keepalived	master
my-web02	192.168.157.32	nginx keepalived	backup
VIP	192.168.157.30

服务架构

CentOS 7 下 Keepalived + Nginx 实现双机高可用,centos,nginx,keepalived

服务安装

nginx

# 所有主机
[root@my-web01 ~]$ yum -y install nginx

Keepalived

# 所有主机
[root@my-web01 ~]$ yum -y install keepalived

服务配置

nginx

web01

[root@my-web01 ~]$ cat /usr/share/nginx/html/index.html 
<!DOCTYPE html>
<h1>my web01 ~~~</h1>

web02

[root@my-web02 ~]$ cat /usr/share/nginx/html/index.html
<!DOCTYPE html>
<h1>my web02 ~~~</h1>

Keepalived

web01

[root@my-web01 ~]$ cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

vrrp_script check_nginx {
    script "killall -0 nginx"
    interval 2
}

vrrp_instance VI_1 {
    interface ens33
    state MASTER
    priority 200

    virtual_router_id 33
    virtual_ipaddress {
        192.168.157.30
    }

    authentication {
        auth_type PASS
        auth_pass password
    }

    track_script {
        check_nginx
    }
}

web02

[root@my-web02 ~]$ cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

vrrp_script check_nginx {
    script "killall -0 nginx"
    interval 2
}

vrrp_instance VI_1 {
    interface ens33
    state BACKUP
    priority 100

    virtual_router_id 33
    virtual_ipaddress {
        192.168.157.30
    }

    authentication {
        auth_type PASS
        auth_pass password
    }

    track_script {
        check_nginx
    }
}

启动服务

nginx

# 所有节点
systemctl start nginx

keepalived

# 所有节点
systemctl start nginx

服务验证

查看 VIP 状态

# web01 -- 获取 VIP
[root@my-web01 ~]$ ip addr | grep '192.168.157'
    inet 192.168.157.31/24 brd 192.168.157.255 scope global ens33
    inet 192.168.157.30/32 scope global ens33

# web01 -- 未获取 VIP
[root@my-web02 ~]$ ip addr | grep '192.168.157'
    inet 192.168.157.32/24 brd 192.168.157.255 scope global ens33

CURL 命令访问

# VIP -- 访问到 web01
[root@my-web01 ~]$ curl 192.168.157.30
<!DOCTYPE html>
<h1>my web01 ~~~</h1>

# web01
[root@my-web01 ~]$ curl 192.168.157.31
<!DOCTYPE html>
<h1>my web01 ~~~</h1>

# web02
[root@my-web01 ~]$ curl 192.168.157.32
<!DOCTYPE html>
<h1>my web02 ~~~</h1>

浏览器访问

vip && web01

CentOS 7 下 Keepalived + Nginx 实现双机高可用,centos,nginx,keepalived

vip && web02

CentOS 7 下 Keepalived + Nginx 实现双机高可用,centos,nginx,keepalived

高可用验证

停止 web01 下 Nginx

停止服务

# web01
[root@my-web01 ~]$ systemctl stop nginx

验证 VIP

# web01 -- VIP 漂移
[root@my-web01 ~]$ ip addr | grep '192.168.157'
    inet 192.168.157.31/24 brd 192.168.157.255 scope global ens33
    
# web02 -- 获取 VIP
[root@my-web02 ~]$ ip addr | grep '192.168.157'
    inet 192.168.157.32/24 brd 192.168.157.255 scope global ens33
    inet 192.168.157.30/32 scope global ens33

浏览器访问

CentOS 7 下 Keepalived + Nginx 实现双机高可用,centos,nginx,keepalived

恢复 web01 下 Nginx

恢复服务

[root@my-web01 ~]$ systemctl start nginx

验证 VIP

# web01 -- 获取 vip
[root@my-web01 ~]$ ip addr | grep '192.168.157'
    inet 192.168.157.31/24 brd 192.168.157.255 scope global ens33
    inet 192.168.157.30/32 scope global ens33
    
# web02 -- vip 漂移
[root@my-web02 ~]$ ip addr | grep '192.168.157'
    inet 192.168.157.32/24 brd 192.168.157.255 scope global ens33