keepalived安装与简单配置

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本文详细介绍在CentOs7上安装Keepalived1.4.5版本的过程，包括从官网下载、解压、编译安装及配置文件设置。通过两台机器的主备配置示例，实现虚拟IP的高可用性。

系统 CentOs7
版本 keeplived 1.4.5

官网下载
keeplived官网下载地址

#解压
tar -zxvf keepalived-1.4.5.tar.gz
#进入目录
cd keepalived-1.4.5
#编译前配置
./configure
#编译并安装
make && make install

此时在keepalived-1.4.5会生成安装后的文件
该目录下有一些配置文件要移动到linux的对应位置

cp   keepalived-1.4.5/keepalived   /usr/sbin/
cp   keepalived-1.4.5/keepalived/etc/init.d/keepalived   /etc/init.d/
cp   keepalived-1.4.5/keepalived/etc/sysconfig/keepalived    /etc/sysconfig/

#创建放配置文件的文件夹
mkdir -p /etc/keepalived
cp   keepalived-1.4.5/keepalived/etc/keepalived/keepalived.conf   /etc/keepalived


#添加可执行权限
chmod +x /etc/init.d/keepalived
#添加keepalived到开机启动
chkconfig --add keepalived	
chkconfig keepalived on

配置

修改/etc/keepalived/keepalived.conf

此处贴上我的简单配置：
功能：
一共两台机器上安装keeplived，一主一备
访问虚拟IP 192.168.23.250
映射到master IP 192.168.23.18
master挂了则映射到backup IP 192.168.23.17

192.168.23.18上的配置：

global_defs {
}
vrrp_instance VI_1 {
	#主节点定义
    state MASTER
    #网卡名称 linux ip addr 查看自己的网卡名称
    interface ens33
    #虚拟路由Id 两台要一致
    virtual_router_id 51
    #权重，根据访问成功失败会自行修改
    priority 100
    advert_int 2
    #验证方式，两台一致
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    #虚拟IP，两台一致
    virtual_ipaddress {
        192.168.23.250/24
    }
}

192.168.23.17上的配置：

global_defs {
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 99
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.23.250/24
    }
}

服务启动