keepalived通过vrr_script实现高可用性案例分析

dfdfs

ps -C nginx --no-heading|wc -l
ps -C java --no-heading|wc -l
先确认一下服务器上上面两个数字


cd  /etc/keepalived

vi  /etc/keepalived/check_nginx.sh
#!/bin/bash
counter=$(ps -C nginx --no-heading|wc -l)
if [ "${counter}" = "0" ]; then
   sleep 2
    counter=$(ps -C nginx --no-heading|wc -l)
    if [ "${counter}" = "0" ]; then
        /etc/init.d/keepalived stop
    fi
fi

vi  /etc/keepalived/check_tomcat.sh         
#!/bin/bash
counter=$(ps -C java --no-heading|wc -l)
if [ "${counter}" -lt "3" ]; then
   sleep 2
    counter=$(ps -C java --no-heading|wc -l)
    if [ "${counter}" -lt "3" ]; then
        /etc/init.d/keepalived stop
    fi
fi

chmod u+x check_nginx.sh
chmod u+x check_tomcat.sh
主 192.168.3.214
cat   /etc/keepalived/keepalived.conf
vi  /etc/keepalived/keepalived.conf
global_defs {
  notification_email {  
  752119102@qq.com
   }
  notification_email_from keepalived@localhost  
  smtp_server 127.0.0.1                        
  smtp_connect_timeout 30                       
  router_id LVS_MASTER                          
}
vrrp_script chk_nginx {
   script "/etc/keepalived/check_nginx.sh"  
    interval 2
    fall 3
}
vrrp_script chk_tomcat {
   script "/etc/keepalived/check_tomcat.sh"
    interval 2
    fall 3
}
vrrp_instance VI_1 {                     
#state MASTER
state BACKUP      
   interface eth1
   track_interface
    {
        eth1
    }      
   virtual_router_id 50   
   priority 150
   nopreempt        
   advert_int 1        
   authentication {   
       auth_type PASS
       auth_pass 1111
   }
   virtual_ipaddress {   
       192.168.3.197/24 dev eth1 label eth1:1
   }
  track_script {
       chk_nginx
       chk_tomcat
    }
}
从1服务器 192.168.3.215
global_defs {
  notification_email {
  752119102@qq.com
   }
  notification_email_from keepalive@localhost
  smtp_server 127.0.0.1
  smtp_connect_timeout 30
  router_id LVS_BACKUP
}
vrrp_script chk_nginx {
   script "/etc/keepalived/check_nginx.sh"  
    interval 2
    fall 3
}
vrrp_script chk_tomcat {
   script "/etc/keepalived/check_tomcat.sh"
    interval 2
    fall 3
}
vrrp_instance VI_1 {
  state BACKUP
   interface eth0
     track_interface
    {
        eth0
    }   
   virtual_router_id 50
   priority 100
nopreempt
   advert_int 1
   authentication {
       auth_type PASS
       auth_pass 1111
   }
   virtual_ipaddress {
       192.168.3.197/24 dev eth0 label eth0:1
   }
  track_script {
       chk_nginx
       chk_tomcat
    }
}
从2  192.168.3.207
cat   /etc/keepalived/keepalived.conf
global_defs {
  notification_email {  
  752119102@qq.com
   }
  notification_email_from keepalived@localhost  
  smtp_server 127.0.0.1                        
  smtp_connect_timeout 30                       
  router_id LVS_MASTER                          
}
vrrp_script chk_nginx {
   script "/etc/keepalived/check_nginx.sh"  
    interval 2
    fall 3
}
vrrp_script chk_tomcat {
   script "/etc/keepalived/check_tomcat.sh"
    interval 2
    fall 3
}
vrrp_instance VI_1 {                     
#state MASTER
state BACKUP      
   interface eth0
   track_interface
    {
        eth0
    }      
   virtual_router_id 50   
   priority 50
   nopreempt        
   advert_int 1        
   authentication {   
       auth_type PASS
       auth_pass 1111
   }
   virtual_ipaddress {   
       192.168.3.197/24 dev eth0 label eth0:1
   }
  track_script {
       chk_nginx
       chk_tomcat
    }
}