Centos7.4下keepalived-2.0.16的安装使用

keepalived两个功能，一个是使lvs使用的vip高可用，一个是监控下游各个子节点的对应端口是否正常工作，以保证快速剔除坏掉的节点。
1.1下载
https://www.keepalived.org/download.html

或者下面连接下载：
链接：https://pan.baidu.com/s/1ONAXBVxoOKdsM8HIJp2Spg
提取码：b3k7
1.2 keepalived安装—Lunix

1. 安装依赖
   yum install -y gcc gcc-c++ openssl-devel
   2.创建文件夹并上传到apps路径下
   mkdir /apps
   mkdir -p /etc/keepalived
   3.解压缩
   tar -zvxf keepalived-2.0.16.tar.gz
2. 进入解压后的目录中，执行以下命令：
   cd keepalived-2.0.16/
   ./configure --prefix=/usr/local/keepalived && make && make install
   cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
   cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf
   cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
   cp keepalived/etc/init.d/keepalived /etc/init.d/
   chmod 755 /etc/init.d/keepalived
   
   、编辑keepalived.service
   vim /lib/systemd/system/keepalived.service

将所有的字符串 “/usr/local/keepalived” 替换为空白，vi编辑器命令:%s//usr/local/keepalived//g

1.3centos7对keepalived操作的基本命令

#查找keepalived 命令
find / -name keepalived
#设置开机自动启动
systemctl enable keepalived
#重新加载
systemctl daemon-reload
#取消开机自动启动
systemctl disable keepalived
#启动
systemctl start keepalived
#停止
systemctl stop keepalived
pkill keepalived
#重启
systemctl restart keepalived
#查看状态及进程
systemctl status keepalived
ps -ef|grep keepalived
#修改配置文件
vim /etc/keepalived/keepalived.conf
#查看日志
tail -f /var/log/messages