Nginx load principle + keepalived high availability use

1. Prepare the environment

1. Prepare 4 virtual machines (mine is centos7.5 version)

Two as web test pages, two as load + high availability

2. Turn off the firewall setenforce

[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# setenforce 0

2. Install and configure two web test pages

1. Install apache first

[root@localhost ~]# yum -y install httpd

2. Edit the html test page for easy distinction

[root@localhost ~]# vim /var/www/html/index.html
web1
[root@localhost ~]# vim /var/www/html/index.html
web2

3. Start and view the test page

[root@localhost ~]# systemctl start httpd

3. Installation and configuration nginx+keepalived

1. Install nginx from source code (two 136 137)

先安装依赖
[root@localhost ~]# yum -y install gcc gcc-c++ pcre-devel zlib-devel
下载nginx源码包  http://nginx.org/  nginx官方网址

[root@localhost ~]# tar xzf nginx-1.12.2.tar.gz 
[root@localhost ~]# cd nginx-1.12.2
[root@localhost nginx-1.12.2]# ./configure && make && make install

2. Configure nginx load balancing

[root@localhost nginx-1.12.2]# vim /usr/local/nginx/conf/nginx.conf

3. Start nginx and test load balancing

[root@localhost nginx-1.12.2]# /usr/local/nginx/sbin/nginx 

4. Install and configure keepalived master (136)

[root@localhost ~]# yum -y install keepalived
[root@localhost ~]# vim /etc/keepalived/keepalived.conf 

5. Start keepalived and check whether the VIP is generated

[root@localhost ~]# systemctl start keepalived

6. Install and configure keepalived from (137)

[root@localhost ~]# yum -y install keepalived
[root@localhost ~]# vim /etc/keepalived/keepalived.conf 

7. Test to see if the VIP drifts from

先把从上的keepalived 启动
[root@localhost nginx-1.12.2]# systemctl start keepalived

在主上把keepalived 关掉
[root@localhost ~]# systemctl stop keepalived

4. Test VIP on the web

If you can’t get out, pay attention to your firewall to release the port and VRRP