四层负载企业实战

news2024/9/21 16:45:27

通过四层负载LVS+keepalived将请求转发到nginx代理服务器。通过代理服务器访问后端真实应用服务。

拓补图：

准备环境6台机器；

lvs+keepalived---两台

nginx代理 ---两台

tomcat----一台

php ----一台

所有机器关闭防火墙和selinux

所有机器解析如下：

192.168.246.142 lvs-keep-master   192.168.30.129
192.168.246.143 lvs-keep-backup   192.168.30.130
192.168.246.144 nginx-web1        192.168.30.131
192.168.246.145 nginx-web2        192.168.30.132
192.168.246.146 tomcat-server     192.168.30.133
192.168.246.147 php-server        192.168.30.134

步骤一部署lvs-keepalived服务

[root@lvs-keep-master ~]# yum -y install ipvsadm keepalived
[root@lvs-keep-master ~]# cd /etc/keepalived/
[root@lvs-keep-master keepalived]# cp keepalived.conf keepalived.conf.bak
[root@lvs-keep-master keepalived]# vim keepalived.conf
! Configuration File for keepalived

global_defs {
   router_id master
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 80
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.246.16/32
    }
}

virtual_server 192.168.246.16 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    net_mask 255.255.255.0
    protocol TCP

    real_server 192.168.246.144 80 {
        weight 1
        inhibit_on_failure
        TCP_CHECK {
        connect_port 80
        connect_timeout 3
    }
}

    real_server 192.168.246.145 80 {
        weight 1
        inhibit_on_failure
        TCP_CHECK {
                connect_port 80
                connect_timeout 3
        }
}
}

[root@lvs-keep-backup ~]# yum -y install ipvsadm keepalived
[root@lvs-keep-backup ~]# cd /etc/keepalived/
[root@lvs-keep-backup keepalived]# cp keepalived.conf keepalived.conf.bak
将master上面的配置文件拷贝backup机器上面
[root@lvs-keep-master keepalived]# scp keepalived.conf 192.168.30.131:/etc/keepalived/
修改backup机器配置文件如下：
[root@lvs-keep-backup keepalived]# vim keepalived.conf
! Configuration File for keepalived

global_defs {
   router_id backup   #修改为backup
}

vrrp_instance VI_1 {
    state BACKUP    #修改为backup
    interface ens33
    nopreempt       #不抢占资源
    virtual_router_id 80
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.30.16/32
    }
}

virtual_server 192.168.30.16 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    net_mask 255.255.255.0
    protocol TCP

    real_server 192.168.30.133 80 {
        weight 1
        inhibit_on_failure
        TCP_CHECK {
        connect_port 80
        connect_timeout 3
    }
}

    real_server 192.168.30.134 80 {
        weight 1
        inhibit_on_failure
        TCP_CHECK {
                connect_port 80
                connect_timeout 3
        }
}
}
两台均启动keepalived
[root@lvs-keep-master ~]# systemctl start keepalived
[root@lvs-keep-backup ~]# systemctl start keepalived
master检查vip是生成：
[root@lvs-keep-master ~]# ip a

第二步部署nginx服务

1.两台机器部署nginx服务

[root@nginx-web1 ~]# cd /etc/yum.repos.d/
[root@nginx-web1 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@nginx-web1 yum.repos.d]# yum install yum-utils -y
[root@nginx-web1 yum.repos.d]# yum install nginx -y
2.给两台机器lo配置vip
[root@nginx-web1 ~]# ip addr add dev lo 192.168.30.16/32
[root@nginx-web1 ~]# echo "net.ipv4.conf.all.arp_ignore = 1" >> /etc/sysctl.conf
[root@nginx-web1 ~]# sysctl -p
================================
[root@nginx-web2 ~]# ip addr add dev lo 192.168.30.16/32
[root@nginx-web2 ~]# echo "net.ipv4.conf.all.arp_ignore = 1" >> /etc/sysctl.conf
[root@nginx-web2 ~]# sysctl -p
3.配置nginx反向代理
[root@nginx-web1 conf.d]# cp default.conf default.conf.bak
[root@nginx-web1 conf.d]# mv default.conf proxy.conf
[root@nginx-web1 conf.d]# vim proxy.conf
server {
        listen 80;
        server_name localhost;

        charset koi8-r;
        access_log /var/log/nginx/host.access.log main;

        location / {
                proxy_pass http://192.168.30.133:8080;
                proxy_set_header Host $host:$server_port;
                proxy_set_header X-Real-IP $remote_port;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }

        location ~ \.php$ {
                proxy_pass http://192.168.30.134;
                proxy_set_header Host $host:$server_port;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }
}
nginx-web2操作：
[root@nginx-web2 ~]# cd /etc/nginx/conf.d/
[root@nginx-web2 conf.d]# mv default.conf default.conf.bak
将nginx-web1上面的proxy.con拷贝到nginx-web2上面
[root@nginx-web1 conf.d]# scp proxy.conf 192.168.30.133:/etc/nginx/conf.d/
启动两台nginx

第三步：部署tomcat服务。。。略

启动tomcat浏览器访问：

第四步部署php服务

1.安装php 略
2.配置nginx
配置nginx源与安装nginx略
[root@php-server ~ ]# cd /etc/nginx/conf.d/
[root@php-server conf.d]# cp default.conf default.conf.bak
[root@php-server conf.d]# mv default.conf server.conf
[root@php-server conf.d]# vim server.conf
server {
    listen       80;
    server_name  localhost;

    charset koi8-r;
    access_log  /var/log/nginx/host.access.log  main;

    location ~ \.php$ {
        root           /usr/share/nginx/html;
        fastcgi_pass   127.0.0.1:9000;
        fastcgi_index  index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include        fastcgi_params;
    }

}
创建index.php文件
[root@php-server conf.d]# cd /usr/share/nginx/html/
[root@php-server html]# vim index.php
<?php
phpinfo();
?>
启动nginx

浏览器访问nginx服务：