keepalived配置

一、 安装keepalived

使用源码先安装keepalived 1.2.6

wget  http://www.keepalived.org/software/keepalived-1.2.6.tar.gz

tar zxf keepalived-1.2.6.tar.gz 

cd keepalived-1.2.6

./configure --prefix=/usr/local/keepalived    #安装到/usr/local/keepalived 目录下

make

make install

如果提示缺少组件Openssl，就先去安装（yum很方便）

二、配置keeplived为全局服务

为了能用 service + 服务名 + stop | start | restart 这样的命令去启动服务，需要做以下配置。（再centos7以后的版本都是systemctl + 服务名 + 。。。）

1.  建立服务启动脚本，以便使用service命令控制之 
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/keepalived

chmod +x /etc/init.d/keepalived

因为我们使用非默认路径（/usr/local）安装keepalived, 故需要修改几处路径，以保证keepalived能正常启动, 需要修改的文件如下：

2. 修改/etc/init.d/keepalived, 寻找大约15行左右的. /etc/sysconfig/keepalived, 修改为： 
.  /usr/local/keepalived/etc/sysconfig/keepalived, 即指向正确的文件位置

同时在上述行下添加以下内容（将keepavlied主程序所在路径导入到环境变量PATH中）：

PATH="$PATH:/usr/local/keepalived/sbin"

export PATH

3. 修改/usr/local/keepalived/etc/sysconfig/keepalived文件，设置正确的服务启动参数 
KEEPALIVED_OPTIONS="-D -f /usr/local/keepalived/etc/keepalived/keepalived.conf"

4. 经过以上修改，keepalived基本安装即可完成，启动测试之： 
service keepalived restart

5. 切勿忘记将此服务设置为开机启动

chkconfig keepalived on

TPS：在redhat中查看vip使用的命令是ip add

三、简单的主备配置

配置文件如下：

master：

! Configuration File for keepalived

global_defs {
   notification_email {
#     acassen@firewall.loc
#     failover@firewall.loc
#     sysadmin@firewall.loc
      root@localhost
   }
   notification_email_from root@localhost
   smtp_server localhost
   smtp_connect_timeout 30
   router_id NodeMaster
}

vrrp_script checkrun {
   script "/usr/local/keepalived/etc/keepalived/check.sh"
   interval 5
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 92
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {
       checkrun
    }
    virtual_ipaddress {
         192.168.163.252
    }
}

vrrp_instance VI_2 {
    state MASTER
    interface eth0
    virtual_router_id 90
    priority 100
    advert_int 1
    authentication {
       auth_type PASS
       auth_pass 2222
    }

    virtual_ipaddress {
       192.168.163.251
    }
}

测试脚本代码如下：

#!/bin/bash
echo "hello world" >> /usr/local/keepalived/etc/keepalived/err.log
exit 1

backup配置如下

! Configuration File for keepalived

global_defs {
   notification_email {
#     acassen@firewall.loc
#     failover@firewall.loc
#     sysadmin@firewall.loc
      root@localhost
   }
   notification_email_from root@local host
   smtp_server localhost
   smtp_connect_timeout 30
   router_id NODEB
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 92
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
         192.168.163.252
    }
}

vrrp_instance VI_2 {
     state BACKUP
     interface eth0
     virtual_router_id 90
     priority 90
     advert_int 1
     authentication {
         auth_type PASS
         auth_pass 2222
     }
     
     virtual_ipaddress {
         192.168.163.251
     }

}

　　

关于配置文件的解释下次再好好看下