centos7安裝keepalived

一、基礎環境

系統版本	nginx版本	keepalived版本	ip	作用
CentOS Linux release 7.5.1804 (Core)	nginx/1.16.1	keepalived-2.0.18	10.1.1.31	master
CentOS Linux release 7.5.1804 (Core)	nginx/1.16.1	keepalived-2.0.18	10.1.1.32	slave

VIP 10.1.1.111

二、安裝nginx

1. 安裝nignx

   yum install nginx -y

2. 修改nginx配置文件

   • master

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

   • slave

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

3. 啓動nginx

   systemctl start nginx 

4. 測試nginx啓動

   curl localhost
   
   this is master

三、安裝keepalived

1、 創建依賴環境

yum -y install openssl-devel gcc gcc-c++
mkdir /etc/keepalived
wget https://www.keepalived.org/software/keepalived-2.0.18.tar.gz

2、安裝keepalived

tar -zxvf keepalived-2.0.18.tar.gz
mv keepalived-2.0.18 /usr/local/keepalived
cd /usr/local/keepalived
./configure && make && make install

3、創建啓動文件

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、創建配置文件

1. master

   cat > /etc/keepalived/keepalived.conf << EOF
   ! Configuration File for keepalived
   global_defs {
          router_id 31
   } 
   vrrp_instance VI_1 {
          state MASTER
          interface ens33
          virtual_router_id 3
          mcast_src_ip 10.1.1.132
          priority 200
          advert_int 1 
          authentication {
                  auth_type PASS
                  auth_pass 123456
          }
          virtual_ipaddress {
                  10.1.1.111/24
          }
   }
   EOF

2. slave

   cat > /etc/keepalived/keepalived.conf << EOF
   ! Configuration File for keepalived
   global_defs {
          router_id 32
   } 
   vrrp_instance VI_1 {
          state BACKUP
          interface ens33
          virtual_router_id 3
          mcast_src_ip 10.1.1.132
          priority 90 
          advert_int 1 
          authentication {
                  auth_type PASS
                  auth_pass 123456
          }
          virtual_ipaddress {
                  10.1.1.111/24
          }
   }
   EOF

5、啓動keepalived

systemctl start keepalived
systemctl enable keepalived

四、測試

1、在兩臺服務器上測試

1. master

   $ curl localhost
   this is master
   root@centos7[14:46:07]:~
   $ curl 10.1.1.111
   this is master
   root@centos7[15:03:29]:~

2. slave

   $ curl localhost
   this is slave
   root@centos7[15:03:59]:/etc/keepalived
   $ curl 10.1.1.111
   this is master

2、關閉master的keepalived模仿down機

1. master關閉keepalived

   $ systemctl stop keepalived 

2. 在slave上面進行測試

$  curl localhost
this is slave
root@centos7[15:10:29]:/etc/keepalived
$ curl 10.1.1.111
this is slave

到此keepalived完成