How to install and configure keepalived in centos7

How to install and configure keepalived in centos7 system? I believe that most people have not yet learned this skill, in order to let you learn, to give you a summary of the following content, do not say much, let's move on.

1. Basic environment system version nginx version keepalived version ip function CentOS Linux release 7.5.1804 (Core) nginx/1.16.1keepalived-2.0.1810.1.1.31masterCentOS Linux release 7.5.1804 (Core) nginx/1.16.1keepalived-2.0.1810.1.1.32slave

VIP 10.1.1.111

II. Install nginx

Install nignx

Yum install nginx-y

Modify nginx configuration file

Master

Echo 'this is master 31' > / usr/share/nginx/html/index.html

Slave

Echo 'this is slave 32' > / usr/share/nginx/html/index.html

Start nginx

Systemctl start nginx

Test nginx startup

Curl localhostthis is master III. Install keepalived1, create a dependent environment yum-y install openssl-devel gcc gcc-c++mkdir / etc/keepalivedwget https://www.keepalived.org/software/keepalived-2.0.18.tar.gz2, install keepalivedtar-zxvf keepalived-2.0.18.tar.gzmv keepalived-2.0.18 / usr/local/keepalivedcd / usr/local/keepalived./configure & & make & & make install3, Create startup file cp-a / usr/local/etc/keepalived / etc/init.d/cp-a / usr/local/etc/sysconfig/keepalived / etc/sysconfig/cp-a / usr/local/sbin/keepalived / usr/sbin/4, create configuration file

Master

Cat > / etc/keepalived/keepalived.conf / etc/keepalived/keepalived.conf