【Linux运维-集群技术进阶】Keepalived安装配置

认识Keepalived

Keepalived的作用是检测web服务器的状态，如果有一台web服务器死机，或工作出现故障，Keepalived将检测到，并将有故障的web服务器从系统中剔除，当web服务器工作正常后Keepalived自动将web服务器加入到服务器群中，这些工作全部自动完成，不需要人工干涉，需要人工做的只是修复故障的web服务器。

Keepalived实现服务的高可用（HA），应用已经非常广泛，很多软件都会和他搭配使，比如LVS，Nginx，Redis等等。今天先来看看Linux环境中Keepalived是如何安装配置的。

去Keepalived官网（www.keepalived.org）下载软件包，上传至服务器。

开始安装

解压：

[code][root@localhost ~]# cd /usr/local/software/
[root@localhost software]# tar -zxvf keepalived-1.2.19.tar.gz

安装依赖插件：

[code]yum install -y gcc openssl-devel popt-devel

编译安装：

[code][root@localhost software]# cd keepalived-1.2.19
[root@localhost keepalived-1.2.19]# ./configure --prefix=/usr/local/keepalived
[root@localhost keepalived-1.2.19]#make && make install

编译之后的配置

1. 建立服务启动脚本，以便使用service命令控制

[code]cp /usr/local/keepalived/etc/rc.d/init.d/keepalived     /etc/init.d/keepalived  

//获取权限
chmod +x /etc/init.d/keepalived

2. 因为我们使用非默认路径（/usr/local）安装的keepalived, 故需要修改几处路径，以保证keepalived能正常启动, 需要修改的文件如下：

修改

/etc/init.d/keepalived

, 寻找大约15行左右的

. /etc/sysconfig/keepalived

, 修改为：

.  /usr/local/keepalived/etc/sysconfig/keepalived

, 即指向正确的配置文件位置。

3. 配置环境变量（将keepavlied主程序所在路径导入到环境变量PATH中）：

[code]KEEPALIVED_HOME=/usr/local/keepalived
PATH=$KEEPALIVED_HOME/sbin:$PATH
export PATH

4. 建立可执行文件链接：

[code] ln -s /usr/local/keepalived/sbin/keepalived  /usr/sbin/

5. 修改/usr/local/keepalived/etc/sysconfig/keepalived文件，设置正确的服务启动参数

[code]KEEPALIVED_OPTIONS="-D -f /usr/local/keepalived/etc/keepalived/keepalived.conf"

6. 经过以上修改，keepalived基本安全配置即可完成，启动测试之：

[code]service keepalived restart

7. 将Keepalived服务设置为开机启动

[code]chkconfig keepalived on

启动keepalived

[code][root@localhost keepalived]# service keepalived start
Starting keepalived (via systemctl):                       [  确定  ]
[root@localhost keepalived]#

至此Keepalived的安装配置已经完成，后续会介绍Keepalived如何实现HA。