Centos 7安装配置keepalived:


yum -y install gcc gcc-c++ openssl openssl-devel
wget http://www.keepalived.org/software/keepalived-1.4.5.tar.gz
tar zxf keepalived-1.4.5.tar.gz
cd keepalived-1.4.5
./configure
make && make install
mkdir -p /etc/keepalived

cat <<-ENDKP > /etc/keepalived/keepalived.conf
global_defs {  
   router_id MASTER
} 
vrrp_instance MT{
    state MASTER
    interface ens192
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication{
        auth_type PASS
        auth_pass 654321
    }
    virtual_ipaddress{
        192.168.18.56
    }
}
ENDKP

setenforce 0
getenforce
sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
systemctl stop firewalld
systemctl disable firewalld
service keepalived start
systemctl enable keepalived

上面的配置文件内容为Master节点的配置，Slave节点配置如下：

global_defs {  
   router_id BACKUP
} 
vrrp_instance MT{
    state BACKUP
    interface ens192
    virtual_router_id 51
    priority 99
    advert_int 1
    authentication{
        auth_type PASS
        auth_pass 654321
    }
    virtual_ipaddress{
        192.168.18.56
    }
}

也可以配置双主的策略，配置和Master节点基本相同。详情如下：

global_defs {  
   router_id BACKUP
} 
vrrp_instance MT{
    state MASTER
    interface ens192
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication{
        auth_type PASS
        auth_pass 654321
    }
    virtual_ipaddress{
        192.168.18.56
    }
}

注：interface ens192参数中：ens192代表当前网卡设备名，请根据自己系统实际情况调整。