Keepalived以VRRP协议为基础实现的高可用（HA）,VRRP(Virtual Router Redundancy Protocol)协议是用于实现路由冗余的协议，VRRP协议 两台或多台路由设备虚拟成一个设备网，对外提供虚拟路由ip(一个或者多个)

下载地址

#管网下载地址
http://www.keepalived.org/software/keepalived-1.2.18.tar.gz

#俺七牛下载地址
http://yellowcong.qiniudn.com/keepalived-1.2.18.tar.gz

安装前准备

软件是需要编译安装的，所以需要安装编译工具，下面一堆，和直接安装Nginx的编译包是一样的，所以安装过nginx的，可以直接忽略这一步

yum -y install gcc gcc-c++ autoconf automake make      
yum -y install zlib zlib-devel openssl openssl-devel pcre pcre-devel

安装Keepalived

#下载安装文件
wget http://yellowcong.qiniudn.com/keepalived-1.2.18.tar.gz -C /user/locl 

#解压文件
tar -zxvf keepalived-1.2.18.tar.gz

#编译
cd keepalived-1.2.18/
#--prefix 指定安装地址
#/usr/local/keepalived/ 安装的目录，不要和自己安装文件一个目录，不然报错
./configure --prefix=/usr/local/keepalived/

#编译并安装
make && make install

配置的时候，需要到解压的目录里面，执行configure 命令，外面执行会报错

配置安装

配置完成

编译并安装

添加到系统服务

将Keepalived添加到系统服务

#创建keepalived配置文件目录
mkdir /etc/keepalived

#拷贝配置文件到/etc/keepalived目录下
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

#复制keepalived脚本到/etc/init.d/ 目录
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
#拷贝keepalived脚本到/etc/sysconfig/ 目录
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

#建立软连接
ln -s /usr/local/keepalived/sbin/keepalived /sbin/
#这个软连接，这个没有。。。。我就尴尬了
ln -s /usr/local/sbin/keepalived /usr/sbin/

#添加到开机启动
chkconfig keepalived on
#查看服务状况
systemctl status keepalived

错误合集

OpenSSL is not properly installed on your system.

openssl没有 完全安装所导致的，需要安装openssl和openssl-devel

configure: error:
  !!! OpenSSL is not properly installed on your system. !!!
  !!! Can not include OpenSSL headers files.            !!!

解决办法

yum install -y penssl 
yum install -y openssl-devel