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1.KeepAlived安装
1.下载keepalived
wget http://www.keepalived.org/software/keepalived-1.2.18.tar.gz
2.解压安装：
tar -zxvf keepalived-1.2.18.tar.gz -C /usr/local/
3.下载插件openssl
yum install -y openssl openssl-devel（需要安装一个软件包）
4.开始编译keepalived
cd keepalived-1.2.18/ && ./configure --prefix=/usr/local/keepalived
5.make一下
make && make install
常见错误1
执行yum install 报错如下：
File contains no section headers.
解决方案：
步骤1
删除yum.repos.d目录下所有文件
rm -f /etc/yum.repos.d/*
步骤2
然后重新下载阿里的镜像
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
步骤3
清理缓存
yum clean all
步骤4
测试下载安装
yum install gcc
常见错误2
报错: eepalived执行./configure --prefix=/usr/local/keepalived时报错：configure: error: Popt libraries is required
出现此错误的原因：
未安装popt的开发包
解决方法：
yum install popt-devel
安装好popt的开发包。重新./configure 即可。
2.KeepAlived设置为服务，开启启动
将keepalived安装成Linux系统服务，因为没有使用keepalived的默认安装路径（默认路径：/usr/local）,安装完成之后，需要做一些修改工作：
首先创建文件夹，将keepalived配置文件进行复制：
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
然后复制keepalived脚本文件：
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
ln -s /usr/local/sbin/keepalived /usr/sbin/
ln -s /usr/local/keepalived/sbin/keepalived /sbin/
可以设置开机启动：chkconfig keepalived on，到此我们安装完毕!
3.KeepAlived常用命令
service keepalived start
service keepalived stop
systemctl stop firewalld
启动报错Starting keepalived (via systemctl): Job for keepalived.service failed. See 'systemctl status keepalived.service' and 'journalctl -xn' for details.
解决办法
[root@edu-proxy-01 sbin]# cd /usr/sbin/
[root@edu-proxy-01 sbin]# rm -f keepalived
[root@edu-proxy-01 sbin]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
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