Linux-实现双主模型的nginx的高可用

2019-09-27 17:46 来源:未知

实现双主模型的ngnix高可用(一)

图片 1

实验目的:使用keepalived实现Nginx的双主高可用负载均衡集群。

准备:主机7台

client:

172.18.x.x

调度器:keepalived+nginx 带172.18.x.x/16 网卡

192.168.234.27

192.168.234.37

real_server

192.168.234.47

192.168.234.57

192.168.234.67

192.168.234.77

实验环境:两台Nginx proxy(双主Nginx,各需要两块网卡,eth0连接内网,eth1连接外网)、两台web server(请求的负载均衡)、一台client用于验证结果。

实验结果

  1 [root@234c17 ~]# for i in {1..4};do curl www.a.com;curl www.b.com;sleep 1;done
  2 234.57
  3 234.77
  4 234.47
  5 234.67
  6 234.57
  7 234.77
  8 234.47
  9 234.67

图片 2

过程:

注意:为了不影响实验结果,在实验开始前先关闭iptables和selinux

一、先配置4台real_server,安装好测试用的httpd

  1 [root@234c47 ~]# curl 192.168.234.47;curl 192.168.234.57;curl 192.168.234.67;curl 192.168.234.77
  2 234.47
  3 234.57
  4 234.67
  5 234.77

操作步骤:

二、配置keepalived

因为是双主模型

一、配置IP

1.配置keepalived主机234.27

[root@234c27 ~]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
    notification_email {
      root@localhost
    }
    notification_email_from keepalived@localhost
    smtp_server 127.0.0.1
    smtp_connect_timeout 30
    router_id kpone
    vrrp _mcast_group4 234.10.10.10
 }
 vrrp_instance VI_1 {
     state MASTER
     interface ens33
     virtual_router_id 50
     priority 100
     advert_int 1
     authentication {
         auth_type PASS
         auth_pass 1111
     }
     virtual_ipaddress {
         172.18.0.100/16  //这ip调度 192.168.234.47/57
     }
 }
vrrp_instance VI_2 {
     state BACKUP
     interface ens33
     virtual_router_id 51
     priority 80
     advert_int 1
     authentication {
         auth_type PASS
         auth_pass 2222
     }
     virtual_ipaddress {
         172.18.0.200/16  //这ip调度 192.168.234.147/157
     }
}

1.配置A主机的IP

2.配置keepalived主机234.37

[root@234c37 ~]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
    notification_email {
      root@localhost
    }
    notification_email_from keepalived@localhost
    smtp_server 127.0.0.1
    smtp_connect_timeout 30
    router_id kpone
    vrrp _mcast_group4 234.10.10.10
 }
 vrrp_instance VI_1 {
     state BACKUP
     interface ens33
     virtual_router_id 50
     priority 80
     advert_int 1
     authentication {
         auth_type PASS
         auth_pass 1111
     }
     virtual_ipaddress {
         172.18.0.100/16  //这ip调度 192.168.234.47/57
     }
 }
vrrp_instance VI_2 {
     state MASTER
     interface ens33
     virtual_router_id 51
     priority 100
     advert_int 1
     authentication {
         auth_type PASS
         auth_pass 2222
     }
     virtual_ipaddress {
         172.18.0.200/16  //这ip调度 192.168.234.147/157
     }
}

这样双主模型简单的就搭建好了

# ip addr add dev eth0 192.168.10.2/24

3.配置nginx主机234.27/37

先配置http语块

http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;
    upstream web1{  //
        server 192.168.234.47:80;
        server 192.168.234.57:80;
        }
    upstream web2{
        server 192.168.234.67:80;
        server 192.168.234.77:80;
        }

/*
ngx_http_upstream_module
ngx_http_upstream_module模块
用于将多个服务器定义成服务器组,而由proxy_pass, fastcgi_pass等指令
进行引用
1、upstream name { ... }
定义后端服务器组,会引入一个新的上下文
默认调度算法是wrr
Context: http
upstream httpdsrvs {
server ...
server...
...
*/

然后配置server

    server {
        listen       80 default_server; //默认监听80端口
        server_name www.a.com //域名
        listen       [::]:80 default_server;
        root         /usr/share/nginx/html;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

        location / {
                proxy_pass http://web1 ;  //定义访问80端口的请求,以web1提供服务。而指定的web1在http语块中为 192.168.234.47/57:80 提供服务
        }

        error_page 404 /404.html;
            location = /40x.html {
        }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }
    }
    server {
        server_name www.b.com
        listen 80;
        location / {
                proxy_pass http://web2 ; //定义访问80端口的请求,以web2提供服务。而指定的web2在http语块中为 192.168.234.147/157:80 提供服务

        }
    }
}

这样访问 www.a.com就是访问192.168.234.47/57:80

访问 www.b.com就是访问192.168.234.67/77:80

现在客户机将host添加www.a/b.com

172.18.0.100 www.a.com
172.18.0.200
www.b.com

    客户端将www.a.com 解析 172.18.0.100

[root@234c17 ~]# ping www.a.com
PING www.a.com (172.18.0.100) 56(84) bytes of data.
64 bytes from www.a.com (172.18.0.100): icmp_seq=1 ttl=64 time=0.358 ms
64 bytes from www.a.com (172.18.0.100): icmp_seq=2 ttl=64 time=0.376 ms
64 bytes from www.a.com (172.18.0.100): icmp_seq=3 ttl=64 time=0.358 ms
64 bytes from www.a.com (172.18.0.100): icmp_seq=4 ttl=64 time=0.366 ms

    客户端将www.b.com 解析 172.18.0.200

[root@234c17 ~]# ping www.b.com
PING www.b.com (172.18.0.200) 56(84) bytes of data.
64 bytes from www.b.com (172.18.0.200): icmp_seq=1 ttl=64 time=0.582 ms
64 bytes from www.b.com (172.18.0.200): icmp_seq=2 ttl=64 time=0.339 ms
64 bytes from www.b.com (172.18.0.200): icmp_seq=3 ttl=64 time=0.524 ms
64 bytes from www.b.com (172.18.0.200): icmp_seq=4 ttl=64 time=0.337 ms

结果:

  1 [root@234c17 ~]# for i in {1..4};do curl www.a.com;curl www.b.com;sleep 1;done
  2 234.57
  3 234.77
  4 234.47
  5 234.67
  6 234.57
  7 234.77
  8 234.47
  9 234.67

2.配置B主机的IP

实现双主模型的ngnix高可用(二)

图片 3

# ip addr add dev eth0 192.168.10.23/24

现在扩展实验

3.配置C主机的IP

将192.168.234.47/57主机加ip地址

[root@234c47 ~]#ip a a dev ens37 192.168.167/24

[root@234c57 ~]#ip a a dev ens37 192.168.177/24

# ip addr add dev eth0 192.168.10.3/24

编辑http的的配置文件增加基于FQDN虚拟主机

[root@234c47 ~]# vim /etc/httpd/conf.d/vhost.conf

<virtualhost 192.168.234.167:80>
 documentroot /data/web1
 servername www.a.com
< directory /data/web1>
 require all granted
< /directory>
< /virtualhost>

4.配置D主机的IP

另一个主机也加上虚拟主机

[root@234c57 ~]# vim /etc/httpd/conf.d/vhost.conf

<virtualhost 192.168.234.177:80>
documentroot /data/web1
servername www.a.com
<directory /data/web1>
require all granted
< /directory>
< /virtualhost>

# ip addr add dev eth0 192.168.10.33/24

重启httpd服务

结果:访问www.a.com

  1 [root@234c17 ~]# for i in {1..8};do curl www.a.com;done
  2 234.167
  3 234.177
  4 234.47
  5 234.57
  6 234.167
  7 234.167
  8 234.177
  9 234.47
 10 

访问www.b.com

  1 [root@234c17 ~]# for i in {1..8};do curl www.b.com;done
  2 234.67
  3 234.67
  4 234.77
  5 234.67
  6 234.77
  7 234.67
  8 234.77
  9 234.77

二、配置web服务(C和D主机都做同样配置,只需修改默认主页中的IP地址为本机的IP即可,以示区别)

1.安装apache

# yum -y install apache

2.创建默认主页

# vim /var/www/html/index.html

<h1>192.168.10.3</h1>

3.启动apache

# service httpd start

三、配置sorry_server(此服务配置于Nginx proxy主机上,两台Nginx proxy都做同样配置,只需修改默认主页中的IP地址为本机的IP即可,以示区别)

1.安装apache

# yum -y install apache

2.创建默认主页

# vim /var/www/html/index.html

<h1>sorry_server:192.168.10.2</h1>

3.修改监听端口为8080,以免与nginx所监听的端口冲突

# vim /etc/httpd/conf/httpd.conf

Listen 8080

4.启动apache服务

四、配置代理(两台Nginx proxy都做同样配置)

1.安装nginx

# yum -y install nginx

2.定义upstream集群组,在http{}段中定义;

# vim /etc/nginx/nginx.conf

        http {

            upstream websrvs {

                server 192.168.10.3:80;

                server 192.168.10.33:80;

                server 127.0.0.1:8080 backup;

            }

        }

3.调用定义的集群组,在server{}段的location{}段中调用;

# vim /etc/nginx/conf.d/default.conf

        server {

            location / {

                proxy_pass http://wersrvs;

                index index.html;

            }

        }

4.启动服务

# service nginx start

五、配置keepalived

A主机上操作

1.安装keepalived

# yum -y install keepalived

2.编辑A主机的配置文件/etc/keepalived/keepalived.conf,作如下配置:

! Configuration File for keepalived

    global_defs {

    notification_email {

        root@localhost

    }

    notification_email_from keepalived@localhost

    smtp_server 127.0.0.1

    smtp_connect_timeout 30

    router_id CentOS6

    vrrp_mcast_group4 224.0.100.39

    }

    vrrp_script chk_down {

        script “[[ -f /etc/keepalived/down ]] && exit 1 || exit 0”

        interval 1

        weight -5

    }

    vrrp_script chk_nginx {

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