一、下载

https://www.keepalived.org/download.html

keepalived-1.4.5.tar.gz

二、编译安装

yum install -y gcc openssl-devel libnl libnl3-devel libnfnetlink-devel
tar -zxvf keepalived-1.4.5.tar.gz
cd keepalived-1.4.5
./configure prefix=/usr/local/keepalived
make && make install

三、修改配置文件

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

! Configuration File for keepalived

# 定义用于实例执行的脚本内容
vrrp_script chk_http_nginx {
        script "/opt/nginx/check_nginx.sh"
        interval 10
        weight 2
}

# 全局配置
global_defs {
    router_id LVS_DEVEL
}

# 定义一个虚拟路由器的实例名称
vrrp_instance VI_1 {
    # 定义初始状态，可以是MASTER或者BACKUP
    state MASTER
    # 工作接口，通告选举使用哪个接口进行
    interface eth0
    # 优先级
    priority 100
    # 本地IP地址
    unicast_src_ip 192.168.100.11
    # 配置从节点的目标IP地址
    unicast_peer {
        192.168.100.12
    }
    # ID还是虚拟MAC最后一段地址的信息，取值范围0-255
    virtual_router_id 6
    # 工作模式，nopreempt表示工作在非抢占模式，默认是抢占模式 preempt
    nopreempt
    # 通告频率，单位为秒
    advert_int 1
    # 通信认证机制，这里是明文认证还有一种是加密认证
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    # 追踪脚本，通常用于去执行上面的vrrp_script定义的脚本内容
    track_script {
        chk_http_nginx
    }
    # 设置虚拟VIP地址
    virtual_ipaddress {
        192.168.100.10
    }
}

四、启动

/usr/local/keepalived/sbin/keepalived -f /usr/local/keepalived/conf/keepalived.conf