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Nginx+keepalived实现七层的负载均衡的高可用(最新解决方案)

2024-03-16 10:29:23 作者：Starts️

这篇文章主要介绍了Nginx+keepalived实现七层的负载均衡的高可用,本文给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值，需要的朋友参考下吧

Nginx+keepalived实现七层的负载均衡的高可用

一、准备服务器

1、主机清单

主机名	ip	系统
Proxy-master	10.12.153.105	centos7.5
Proxy-slave	10.12.153.176	centos7.5
Real-server1	10.12.153.114	Centos7.5
Real-server2	10.12.153.187	centos7.5

2、配置安装nginx 所有的机器，关闭防火墙和selinux

[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

3.安装nginx，全部4台

[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

二、部署负载均衡

1、选择两台nginx服务器作为代理服务器。
2、给两台代理服务器安装keepalived制作高可用生成VIP
3、配置nginx的负载均衡

#两台代理配置一样

1、修改nginx的配置文件，添加以下内容，

#注意：将/etc/nginx/conf.d/default.conf改名，不然转发不过去

[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;
}
}

2、重启nginx

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

3.修改server1、server2的web页面测试

[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

4..访问负载均衡

负载均衡正常

三、Keepalived实现调度器HA

注：主/备调度器均能够实现正常调度

1、主/备调度器安装软件

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

2、备份keepalived配置文件

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

3、修改配置文件

①修改master

[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
    }
}

②修改slave

[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
    }
}

4、启动keepalived（主备均启动）

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

5、通过停止keepalived来测试VIP是否飘逸

①在master，slave上查看

②停掉master的keepalived来模仿master宕机，看VIP是否飘逸

由此可见nginx的高可用成功

到此：
可以解决心跳故障keepalived
不能解决Nginx服务故障

四、解决nginx服务故障

扩展对调度器Nginx健康检查（可选）两台都设置

1、作用

让Keepalived以一定时间间隔执行一个外部脚本，脚本的功能是当Nginx失败，则关闭本机的Keepalived

2、检查nginx健康的脚本

! 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         
    }
}

注：必须先启动nginx，再启动keepalived

3、测试

停止master的nginx，VIP会飘逸到salve上，

再次启动master的nginx，重启master的keepalived，VIP会飘到master上。

到此这篇关于Nginx+keepalived实现七层的负载均衡的高可用的文章就介绍到这了,更多相关Nginx keepalived七层负载均衡内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！

Nginx+keepalived实现七层的负载均衡的高可用(最新解决方案)