一、实验背景

keepalived作为一款高可用软件，经常和LVS等负载均衡配合使用。

keepalived可以实现vip的自动漂移，并且会检测后端服务器的状态，当主服务器工作出现故障时会将其剔除，并将备用服务器上线；当主服务器修复后，又会自动将备用服务器下线，让主服务器上线。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服务器。

联网yum安装的keepalived版本为1.x，keepalived最新版本已经到了2.x,那么我们如何编译安装最新版本的keepalived?

二、实验环境

操作系统： CentOS7.5

ip: 192.168.1.104

测试用vip: 192.168.1.110

三、编译工具及编译依赖安装

# yum -y install epel-release vim wget

# yum -y install psmisc

# yum -y install libnl libnl-devel libnfnetlink-devel popt-devel gcc make openssl openssl-devel

四、keepalived软件包下载

官网：http://www.keepalived.org/download.html

# wget http://www.keepalived.org/software/keepalived-2.0.12.tar.gz

五、编译keepalived

# tar -zxf keepalived-2.0.12.tar.gz

# cd keepalived-2.0.12

# ./configure --help

方式一、用 --with-init=SYSV 的方式编译

# ./configure --prefix=/usr/local/keepalived --with-init=SYSV

# make && make install

# ll /usr/local/keepalived/

方式二、用--with-init=systemd 的方式编译

# ./configure --prefix=/usr/local/keepalived --with-init=systemd

# make && make install

# ll /usr/local/keepalived/

相关配置文件模板

# mkdir /etc/keepalived

编译后，生成的keepalived.service文件路径

# ll /usr/lib/systemd/system/keepalived.service

###########################################

如果不用编译后的keepalived.service默认文件，可以定义为 /etc/systemd/system/keepalived.service

# cp keepalived-2.0.12/keepalived/keepalived.service /etc/systemd/system/

# cat /etc/systemd/system/keepalived.service

实际上 keepalived.service 放在 /etc/systemd/system/ 优先级会高于放在 /usr/lib/systemd/system/ 下

#############################################

# cat /usr/lib/systemd/system/keepalived.service

# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

# vim /etc/keepalived/keepalived.conf

###############################

! Configuration File for keepalived

global_defs {

router_id LVS_DEVEL

}

vrrp_script check_sshd {

script "killall -0 sshd"

interval 2

fall 3

rise 3

}

vrrp_instance VI_1 {

state MASTER

interface ens33

virtual_router_id 120

priority 100

advert_int 1

nopreempt

authentication {

auth_type PASS

auth_pass 1111

}

track_script {

check_sshd

}

virtual_ipaddress {

192.168.1.110

}

##################################

# systemctl daemon-reload

# systemctl start keepalived

# systemctl enable keepalived

# systemctl status keepalived

用--with-init=systemd 的方式编译，可以不用systemd的keepalived.service，而用SYSV的 keepalived启动脚本启动，反之亦然，只是需要自己写keepalived.service文件了！

# mkdir /etc/keepalived

# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

# cp keepalived-2.0.12/keepalived/etc/init.d/keepalived /etc/init.d/

# chmod 700 /etc/init.d/keepalived

# ln -s /usr/local/keepalived/bin/genhash /usr/bin/

# ln -s /usr/local/keepalived/sbin/keepalived /usr/sbin/

# chkconfig --add keepalived

# chkconfig keepalived on

# service keepalived start

# service keepalived status

六、参考

Keepalived 2.0.6编译安装

http://blog.51cto.com/lajifeiwomoshu/2152667

Keepalived 2.07编译安装与配置教程

http://www.linuxe.cn/post-266.html

Keepalived系列一：安装Keepalived

https://www.cnblogs.com/xiaoit/p/4499703.html

kill -0 pid是做什么用的？

http://www.zhixing123.cn/stdq/57281.html

http://blog.51cto.com/dzm911/1940295

https://bbs.csdn.net/topics/391890814

https://stackoverflow.com/questions/11012527/what-does-kill-0-pid-in-a-shell-script-do

CentOS7精简安装后使用发现没有killall命令

https://my.oschina.net/zhangxu0512/blog/383297

How To Set Up Highly Available Web Servers with Keepalived and Floating IPs on Ubuntu 16.04

https://vexxhost.com/resources/tutorials/highly-available-web-servers-keepalived-floating-ips-ubuntu-16-04

【keepalived】How to compile and install keepalived on CentOS7.x