Nginx+keepalived实现七层的负载均衡的高可用(最新解决方案)

[root@proxy-master ~]# systemctl stop firewalld         //关闭防火墙
[root@proxy-master ~]# sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/sysconfig/selinux        //关闭selinux，重启生效
[root@proxy-master ~]# setenforce 0        　　　　　　　　//关闭selinux，临时生效

[root@proxy-master ~]# cd /etc/yum.repos.d/
[root@proxy-master yum.repos.d]# vim nginx.repo
[nginx-stable]
name=nginx stable repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=0
enabled=1
[root@proxy-master yum.repos.d]# yum install yum-utils -y
[root@proxy-master yum.repos.d]# yum install nginx -y

[root@proxy-slave conf.d]# mv default.conf default.conf.back

upstream backend {
    server 10.12.153.114:80 weight=1 max_fails=3 fail_timeout=20s;
    server 10.12.153.187:80 weight=1 max_fails=3 fail_timeout=20s;
    }
    server {
        listen 80;
        server_name localhost;
        location / {
        proxy_pass http://backend;
        proxy_set_header Host $host:$proxy_port;
        proxy_set_header X-Forwarded-For $remote_addr;
}
}

[root@proxy-master ~]# nginx -s reload

[root@server2 ~]# cat >>/usr/share/nginx/html/index.html<<EOF
> 187
> EOF
[root@server1 html]# cat >/usr/share/nginx/html/index.html<<EOF
> 114
> EOF

[root@proxy-master ~]# yum install -y keepalived
[root@proxy-slave ~]# yum install -y keepalived

[root@proxy-master ~]# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak

[root@proxy-master ~]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {
   router_id directory1   #辅助改为directory2
}
：
vrrp_instance VI_1 {
    state MASTER        #定义主还是备
    interface ens33     #VIP绑定接口
    virtual_router_id 80  #整个集群的调度器一致
    priority 100         #back改为50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.12.153.151/24   # vip
    }
}

[root@proxy-slave ~]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {
   router_id directory2
}
vrrp_instance VI_1 {
    state BACKUP    #设置为backup
    interface ens33
    nopreempt        #设置到back上面，不抢占资源
    virtual_router_id 80
    priority 50   #辅助改为50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.12.153.151/24
    }
}

[root@proxy-master ~]# systemctl enable keepalived
[root@proxy-slave ~]# systemctl start keepalived

! Configuration File for keepalived
global_defs {
   router_id directory1   #辅助改为directory2
}
：
vrrp_script check_nginx {
   script "/etc/keepalived/check_nginx_status.sh"
   interval 5
}
vrrp_instance VI_1 {
    state MASTER        #定义主还是备
    interface ens33     #VIP绑定接口
    virtual_router_id 80  #整个集群的调度器一致
    priority 100         #back改为50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.12.153.151/24   # vip
    }
  track_script {
        check_nginx         
    }
}