nginx+keepalived主辅切换

旧城等待， 2022-07-13 12:54 176阅读 0赞

1、Nginx的安装，在前面的博客讲到。具体见下面的连接

Nginx的安装  [http://blog.csdn.net/zbw18297786698/article/details/52556293 ][http_blog.csdn.net_zbw18297786698_article_details_52556293]

2、Keepalived的安装

2.1 下载地址，[http://www.keepalived.org/download.html][http_www.keepalived.org_download.html]

2.2 安装依赖包

yum install -y openssl openssl-devel

2.3 解压安装

tar -zxvf keepalived-1.2.18.tar.gz -C /usr/local/
    cd keepalived-1.2.18/ && ./configure --prefix=/usr/local/keepalived
    make && make install

2.4 将Keepalived安装成Linux系统服务,因为没有使用keepalived的默认安装路径（默认路径：/usr/local）,安装完成之后，需要做一些修改工作。

首先创建文件夹，将keepalived配置文件进行复制

mkdir /etc/keepalived
    cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

然后复制keepalived脚本文件

cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
    cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
    ln -s /usr/local/sbin/keepalived /usr/sbin/
    ln -s /usr/local/keepalived/sbin/keepalived /sbin/

设置开机启动

chkconfig keepalived on

3、对Master节点的Keepalived进行修改

keepalived.conf配置文件

! Configuration File for keepalived
    
    global_defs {
       router_id Keepalive_Nginx  ##两个节点要一致
    }
    vrrp_script chk_nginx {
        script "/etc/keepalived/nginx_check.sh" ##执行脚本位置
        interval 2 ##检测时间间隔
    }
    vrrp_instance VI_1 {
        state MASTER   ## 主节点为MASTER，备份节点为BACKUP
        interface eth1 ## 绑定虚拟IP的网络接口（网卡），与本机IP地址所在的网络接口相同
        virtual_router_id 51 ## 两个主机主机要一致
        mcast_src_ip 192.168.2.112  ## 本机ip地址 
        priority 100 ##优先级配置（0-254的值）
        advert_int 1 ## 组播信息发送间隔，俩个节点必须配置一致，默认1s
        authentication {
            auth_type PASS ##对密码加密
            auth_pass 1111
        }
        track_script {
            chk_nginx
        }
    
        virtual_ipaddress {
            192.168.2.114
        }
    }

4、对Backup节点的Keepalived进行修改

keepalived.conf配置文件

! Configuration File for keepalived
    
    global_defs {
       router_id Keepalive_Nginx ##俩个节点必须配置一致
    }
    
    vrrp_script chk_nginx {
        script "/etc/keepalived/nginx_check.sh" ##执行脚本位置
        interval 2 ##检测时间间隔
    }
    vrrp_instance VI_1 {
        state BACKUP     ## 备份节点为BACKUP
        interface eth1 ## 绑定虚拟IP的网络接口（网卡）与本机IP地址所在的网络接口相同
        virtual_router_id 51  ## 两个主机主机要一致
        mcast_src_ip 192.168.2.113  ## 本机ip地址
        priority 90 ##优先级配置（0-254的值）
        advert_int 1 ## 组播信息发送间隔，俩个节点必须配置一致，默认1s
        authentication {
            auth_type PASS ##对密码加密
            auth_pass 1111
        }
        
        track_script {
            chk_nginx
        }
    
        virtual_ipaddress {
            192.168.2.114
        }
    }

5、检查Nginx状态的脚本文件，nginx\_check.sh

#!/bin/bash
    A=`ps -C nginx --no-header |wc -l`
    if [ $A -eq 0 ];then
        /usr/local/nginx/sbin/nginx
        sleep 2
        if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
            killall keepalived
        fi
    fi

6、需要给检查Nginx状态的脚本文件，加上执行权限

chmod +x nginx_check.sh

7、关于Keepalived和nginx\_check.sh脚本存放的位置，统一存放在下面的目录

/etc/keepalived

8、关于查看当前的网卡信息

![20170110143235556][]

9、[用到的软件和资料下载][Link 1]

10、类似的好的博客

https://segmentfault.com/a/1190000002881132

[http_blog.csdn.net_zbw18297786698_article_details_52556293]: http://blog.csdn.net/zbw18297786698/article/details/52556293
[http_www.keepalived.org_download.html]: http://www.keepalived.org/download.html
[20170110143235556]: /images/20220713/8a18c8c0fb8c44578d137457915c7f2a.png
[Link 1]: http://pan.baidu.com/s/1gf3I1JP