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Keepalived的安装过程
keepalived的安装非常简单，以操作系统环境RHEL发行版为例，建议通过yum方式直接安装：
[root@keepalived-master app]# yum install keepalived
如果需要lvs功能，还需要安装ipvs模块：
[root@keepalived-master app]# yum install ipvsadm
也可以通过源码安装，过程如下：
yum install -y gcc gcc-c++ wget popt-devel openssl openssl-devel
yum install -y libnl3 libnl3-devel
tar zxvf keepalived-2.3.1.tar.gz
cd keepalived-2.3.1
./configure –sysconf=/etc
make
make install
systemctl enable keepalived
安装完成后，进入keepalived的配置过程。默认模板配置文件位于/etc/keepalived/keepalived.conf.sample 。

修改名字

[root@lnmp keepalived-2.3.1]# cd /etc/keepalived/
[root@lnmp keepalived]# ls
keepalived.conf.sample samples
[root@lnmp keepalived]# mv keepalived.conf.sample keepalived.conf