Nginx+Keepalived 实现反代 负载均衡 高可用(HA)配置

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　　Nginx+Keepalived实现反代负载均衡高可用(HA)配置

Nginx+Keepalived实现反代负载均衡高可用配置

OS	IP	子网掩码	路由网关
Centos6.6 nginx Keepalived	Eth0:192.168.26.210	255.255.252.0	192.168.25.3
	VIP:192.168.27.210
Centos6.6 Nginx Keepalived	Eth0:192.168.26.211	255.255.252.0	192.168.25.3
	VIP:192.168.27.210
Centos6.6(WEB) (nginx/apache)	Eth0:192.168.26.212	255.255.252.0	192.168.25.3
Centos6.6(WEB) (nginx/apache)	Eth0:192.168.26.218	255.255.252.0	192.168.25.3

后端：192.168.26.212和192.168.26.218服务器配置安装这里略过。
192.168.26.210和192.168.26.211安装Keepalived 和Nginx:
Yum install nginx


编辑配置文件：vim /usr/local/nginx/conf/nginx.conf

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    #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  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;
upstream nginx.jerry.com {
# ip_hash;
server 192.168.26.212:80;
server 192.168.26.218:80;


}
    #gzip  on;

    server {
        listen       80;
        server_name  nginx.jerry.com;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html;
           index  index.html index.htm;
           proxy_pass http://nginx.jerry.com;
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }


    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;

    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}
注意：192.168.26.211安装nginx配置完全相同这里略过。
192.168.26.210安装keepalived。

yum install -y keepalived

安装成功后编辑配置文件：vim /etc/keepalived/keepalived.conf


Keepalived配置文件：keepalived.conf

! Configuration File for keepalived

global_defs {
notification_email {
        jwenshan@hysec.com
        jwenshan@gmail.com
   }

   notification_email_from jwenshan@163.com
   smtp_server smtp.hysec.com
   smtp_connect_timeout 30
   router_id nginx

}

vrrp_script Monitor_Nginx {
       script "/etc/keepalived/chk_nginx.sh"
       interval 2
       weight 2
}
vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {
          Monitor_Nginx
    }
    virtual_ipaddress {
        192.168.27.210
    }
}

Nginx状态检测脚本：vim /etc/keepalived/chk_nginx.sh
#!/bin/bash
A=`ps -C nginx --no-header |wc -l`
if [ $A -eq 0 ];then
    echo 'nginx server is died'
    /etc/init.d/keepalived stop
fi

192.168.26.211keepalived配置文件基本相同：
! Configuration File for keepalived

global_defs {
notification_email {
        jwenshan@hysec.com
        jwenshan@gmail.com
   }

   notification_email_from jwenshan@163.com
   smtp_server smtp.hysec.com
   smtp_connect_timeout 30
   router_id nginx

}

vrrp_script Monitor_Nginx {
       script "/etc/keepalived/chk_nginx.sh"
       interval 2
       weight 2
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {
          Monitor_Nginx
    }
    virtual_ipaddress {
        192.168.27.210
    }
}

Nginx状态检测脚本：vim /etc/keepalived/chk_nginx.sh
#!/bin/bash
A=`ps -C nginx --no-header |wc -l`
if [ $A -eq 0 ];then
    echo 'nginx server is died'
    /etc/init.d/keepalived stop
fi

安装完成后启动NGINX和keepalived服务。
通过vip:192.168.27.210访问网站：

http://192.168.27.210







访问成功实现了RR负载均衡。


测试通过域名访问网站：http://nginx.jerry.com






同样实现了RR负载均衡。

再把192.168.26.210上的NGINX关闭，测试能否实现vip转移(ha)





仍然可以访问：

测试成功

基于ip_hash访问效果（配置前端NGINX参数）