keepalived实现web高可用集群

1、实验环境

两台CentOS-7.5虚拟机
web1：10.0.11.203
web2：10.0.11.204
VIP ：10.0.11.210
web类型：nginx
客户端：自用笔记本(win10)

2、准备两台web服务器

1）web1网卡情况
[root@CentOS ~]#
[root@CentOS ~]# ip a

2）web2网卡情况
[root@CentOS-2 ~]#
[root@CentOS-2 ~]# ip a

3）安装nginx

web1端：
[root@CentOS ~]#
[root@CentOS ~]# yum install nginx
[root@CentOS ~]# rpm -qa nginx
nginx-1.16.1-1.el7.x86_64
[root@CentOS ~]#
[root@CentOS ~]#
[root@CentOS ~]# > /usr/share/nginx/html/index.html #清空默认网页
[root@CentOS ~]# echo web1 > /usr/share/nginx/html/index.html #让网页显示web1
[root@CentOS ~]# cat /usr/share/nginx/html/index.html
web1
[root@CentOS ~]#
[root@CentOS ~]# systemctl start nginx #启动nginx
[root@CentOS ~]# systemctl enable nginx #设置nginx开机自启动
C:\Users\Administrator>curl 10.0.11.203

web2端：
[root@CentOS-2 ~]#
[root@CentOS-2 ~]# yum install nginx
[root@CentOS-2 ~]# rpm -qa nginx
nginx-1.16.1-1.el7.x86_64
[root@CentOS-2 ~]#
[root@CentOS-2 ~]#
[root@CentOS-2 ~]# > /usr/share/nginx/html/index.html
[root@CentOS-2 ~]# echo web2 > /usr/share/nginx/html/index.html
[root@CentOS-2 ~]# cat /usr/share/nginx/html/index.html
web2
[root@CentOS-2 ~]#
[root@CentOS-2 ~]# systemctl start nginx
[root@CentOS-2 ~]# systemctl enable nginx
C:\Users\Administrator>curl 10.0.11.204

4）安装keepalived
说明：两台web服务器都需要安装keepalived服务

web1端：
[root@CentOS ~]#
[root@CentOS ~]# yum install keepalived
[root@CentOS ~]# rpm -qa keepalived
keepalived-1.3.5-16.el7.x86_64
[root@CentOS ~]#

web2端：
[root@CentOS-2 ~]#
[root@CentOS-2 ~]# yum install keepalived
[root@CentOS-2 ~]# rpm -qa keepalived
keepalived-1.3.5-16.el7.x86_64
[root@CentOS-2 ~]#

5）配置两台keepalived并启动

web1端：
[root@CentOS ~]#
[root@CentOS ~]# > /etc/keepalived/keepalived.conf #清空原来的配置
[root@CentOS ~]# vim /etc/keepalived/keepalived.conf #编辑配置文件，自定义keepalived配置文件
[root@CentOS ~]# cat /etc/keepalived/keepalived.conf

[root@CentOS ~]#
[root@CentOS ~]# systemctl start keepalived #启动
[root@CentOS ~]# systemctl enable keepalived #设置开机启动

web2端：
[root@CentOS-2 ~]#
[root@CentOS-2 ~]# > /etc/keepalived/keepalived.conf
[root@CentOS-2 ~]# vim /etc/keepalived/keepalived.conf
[root@CentOS-2 ~]# cat /etc/keepalived/keepalived.conf

[root@CentOS-2 ~]#
[root@CentOS-2 ~]# systemctl start keepalived #启动
[root@CentOS-2 ~]# systemctl enable keepalived #设置开机启动

3、测试访问
方法：用客户端通过VIP测试访问web

C:\Users\Administrator>curl 10.0.11.210 #个人笔记本通过VIP测试访问web

拔掉web1服务器的网线，用客户端通过VIP测试访问web：
C:\Users\Administrator>curl 10.0.11.210

再次将web1服务器的网线接好，用客户端通过VIP测试访问web：
C:\Users\Administrator>curl 10.0.11.210

4、实验结论：
利用keepalived成功实现了web服务器集群的高可用