keepalived+nginx实现nginx高可用

标签：real   nginx   keepalived   real server   

前期准备：

1、实验拓扑图

2、地址规划

一、安装keepalived和nginx

Master和Backup分别安装:

1、安装keepalived

[root@node1 ~]# yum install keepalived -y

2、配置repo源

[root@node1 ~]# vim /etc/yum.repos.d/nginx.repo

[nginx]

name=nginx repo

baseurl=http://nginx.org/packages/centos/6/$basearch/

gpgcheck=0

enabled=1

3、安装ngxin

[root@node1 ~]# yum install nginx -y

4、Master修改

(1).修改keepaliaved配置文件

[root@node1 ~]# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak

[root@node1 ~]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

   notification_email {

        root@localhost

   }

   notification_email_from Alexandre.Cassen@firewall.loc

   smtp_server 127.0.0.1

   smtp_connect_timeout 30

   router_id LVS1

}

vrrp_script chk_nginx{

        script "killall -0 nginx"

        interval 1

        weight -2

        fall 2

        rise 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

    }

    virtual_ipaddress {

        10.10.0.220 dev eth0 label eth0:0

}

track_script {

        chk_nginx

}

}

(3).拷贝一份配置文件到Backup服

[root@node1 ~]# scp -r /etc/keepalived/keepalived.conf root@10.10.0.226:/etc/keepalived/

[root@node1 ~]# scp -r /etc/nginx/nginx.conf root@10.10.0.226:/etc/nginx/

(4).开启服务并开机自动启动

[root@node1 ~]# service keepalived restart

[root@node1 ~]# service nginx restart

[root@node1 ~]# chkconfig keepalived on

[root@node1 ~]# chkconfig nginx on

5、Backup修改

(1).修改keepalived配置文件

[root@node2 ~]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

   notification_email {

        root@localhost

   }

   notification_email_from Alexandre.Cassen@firewall.loc

   smtp_server 127.0.0.1

   smtp_connect_timeout 30

   router_id LVS2     #修改唯一标识

}

vrrp_script chk_nginx{

        script "killall -0 nginx"

        interval 1

        weight -2

        fall 2

        rise 2

}

vrrp_instance VI_1 {

    state BACKUP

    interface eth0

    virtual_router_id 51

    priority 90

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        10.10.0.220 dev eth0 label eth0:0

}

track_script {

        chk_nginx

}

}

(2).开启服务并开机自动启动

[root@node2 ~]# service keepalived restart

[root@node2 ~]# service nginx restart

[root@node2 ~]# chkconfig keepalived on

[root@node2 ~]# chkconfig nginx on

6、Real Server 1

(1).安装httpd

[root@realserver1]# yum install httpd -y

(2).建立测试页

[root@realserver1]# vim /var/www/html/index.html

<h1>real server 1</h1>

(3).开启服务

[root@realserver1]# service httpd restart   

[root@realserver1]# chkconfig httpd on

(4).测试

7、Real Server 2

(1).安装httpd

[root@realserver2]# yum install httpd -y

(2).建立测试页

[root@realserver2]# vim /var/www/html/index.html

<h1>real server 2</h1>

(3).开启服务

[root@realserver2]# service httpd restart   

[root@realserver2]# chkconfig httpd on

(4).测试

8、nginx实现后端real server的负载均衡，在Master上配置

(1).修改nginx配置文件

[root@node1 ~]# cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.bak

[root@node1 ~]# vim /etc/nginx/nginx.conf

user  nginx;

worker_processes  1;

error_log  /var/log/nginx/error.log warn;

pid        /var/run/nginx.pid;

events {

    worker_connections  1024;

}

http {

    include       /etc/nginx/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  /var/log/nginx/access.log  main;

    sendfile        on;

    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    upstream apacheweb {

        server 10.10.0.225:80 max_fails=3 fail_timeout=2s;

        server 10.10.0.221:80 max_fails=3 fail_timeout=2s;

    }

server {

    listen       80;

    server_name  localhost;

    #charset koi8-r;

    #access_log  /var/log/nginx/log/host.access.log  main;

    location / {

        root   /usr/share/nginx/html;

        index  index.html index.htm;

    }

    location ~ \.(html|htm|gif|jpg|jpeg|bmp|png|ico|txt|js|css)$ {

        root        /var/www/html;  #此处定义后端服务器网页存放路径    

        proxy_pass   http://apacheweb;

    }

    #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   /usr/share/nginx/html;

    }

｝

(2).拷贝一份配置文件到Backup

[root@node1 ~]# scp -r /etc/nginx/nginx.conf root@10.10.0.226:/etc/nginx/

(3).重启nginx服务

[root@node1 ~]# service nginx restart 

[root@node2 ~]# service nginx restart 

9、测试

(1).在浏览器中输入vip地址

刷新浏览器之后

(2).模拟故障：

[root@realserver1]# service httpd stop

停掉real server 1的apache服务,刷新浏览器发现访问的内容一直是real server2的内容

启用之后real server 1会被加入会话。反之停掉real server 2,访问的内容就一直是real server 1啦

本文出自 “ngames” 博客，请务必保留此出处http://ngames.blog.51cto.com/3187187/1652782

keepalived+nginx实现nginx高可用

标签：real   nginx   keepalived   real server   

原文地址：http://ngames.blog.51cto.com/3187187/1652782