KEEPALIVED+LVS-DR mode configuration high Availability load Balancing cluster

Environment: Virtual machine: VMware Workstation operating system: CentOS 5.5

First, KEEPALIVED+LVS-DR mode configuration high available load balancing

The topology is as follows:

Second, server IP configuration information

1. IP_LB Host (Master):

2.ip_lb_2 Host (Backup)

3.WEB1 Host

4.WEB2 Host

See if Ipvsadm software is available separately in master and backup

1. Check whether the Ipvsadm is installed successfully. can be entered directly

[Root@localhost ~]# ipvsadm IP Virtual Server version 1.2.1 (size=4096) prot localaddress:port Scheduler Flags-> Rem Oteaddress:port Forward Weight activeconn inactconn
2. Check whether the template is added to the kernel
[Root@localhost ~]# lsmod |grep ip_vs ip_vs 78081 0

Four, respectively installs the Apache service on the Web1 and the web2 above.
# Installing the Apache service is not explained. Open ports are: 8099

V. Install keepalived on Master Host (192.168.96.2) and backup host (192.168.96.22)
1. keepalived-1.2.1.tar.gz # Extract this file and install (TAR-ZXVF keepalived-1.2.1.tar.gz)
2./configure--prefix=/home/keepalived/--with-kernel-dir=/usr/src/kernels/2.6.18-164.el5-i686
3.make
4.make Install
5. Path to configuration file
cp/home/keepalived/etc/rc.d/init.d/keepalived/etc/init.d/
cp/home/keepalived/etc/sysconfig/keepalived/etc/sysconfig/
cp/home/keepalived/etc/keepalived/keepalived.conf/etc/keepalived/
cp/home/keepalived/sbin/keepalived/sbin/

6. Configure the keepalived.conf file. (IP_LB host <master>)
Vim/etc/keepalived/keepalived.conf

#global define Global_defs {router_id Lvs_t1} vrrp_sync_group bl_group {group {bl_one}} vrrp_instance Bl_one { State MASTER interface eth0 lvs_sync_daemon_interface eth0 virtual_router_id T_int 3 Authentication {Auth_type pass Auth_pass 1111} virtual_ipaddress {192.168.96. Virtual_server 192.168.96.100 8099 {delay_loop 3 Lb_algo RR lb_kind DR persistence_timeout                                                                                                                                      
        1 Protocol TCP Real_server 192.168.96.33 8099 {weight 1                                                                                                                                   
      Tcp_check {                                                                                                                        
 Connect_timeout 10           Nb_get_retry 3                                                                                                                      
            Delay_before_retry 3                                                                                                                         
        Connect_port 8099                                                                                                                                             
       }                                                                                                                                                 
                                                                       }                                                       
    Real_server 192.168.96.4 8099 {                                                                                                                                      
        Weight 1                                                                                                                                   
            Tcp_check {                                                                                                                        
            Connect_timeout 10                                                                                                                            
            Nb_get_retry 3                                                                                                                      
            Delay_before_retry 3 Co         Nnect_port 8099                                                                                                                
        }                                                                                                                                                 
}                  }

7, configure keepalived.conf files. (ip_lb_2 host <backup>)
Vim/etc/keepalived/keepalived.conf

#global define Global_defs {router_id Lvs_t2} vrrp_sync_group bl_group {group {bl_one}} vrrp_instance Bl_one { State BACKUP interface eth0 lvs_sync_daemon_interface eth0 virtual_router_id T_int 3 Authentication {Auth_type pass Auth_pass 1111} virtual_ipaddress {192.168.96. Virtual_server 192.168.96.100 8099 {delay_loop 3 Lb_algo RR lb_kind DR persistence_timeout                                                                                                                  
        1 Protocol TCP Real_server 192.168.96.33 8099 {                                                                                                                                      
        Weight 1                                                                                                                                   
            Tcp_check { Co        Nnect_timeout 10                                                                                                                
         Nb_get_retry 3                                                                                                                      
            Delay_before_retry 3                                                                                                                         
        Connect_port 8099                                                                                                                                             
               }                                                                                                                               }                  
                                                                                                       Real_server 192.168.96.4 8099 {                                                                                                                                      
        Weight 1 Tcp_chec                                                                                                                                   
            K                                                                                                                        
            Connect_timeout 10                                                                                                                            
            Nb_get_retry 3                                           Delay_before_retry 3                                                                           
            Connect_port 8099                                                                                                                                  }                                                                                                                                                 
}       }

8. Start the keepalived on the main standby separately
[Root@ip_lb home]#/etc/init.d/keepalived start
Starting keepalived: [OK]

[Root@ip_lb home]# tail-f/var/log/message


PS: Here is the LVS. It is not configured with Ipvsadm software, but is controlled directly by keepalived virtual_server configuration items.
# Install IPVSADM only can see the load condition. In fact, only need keepalived can also achieve load Balancing cluster.

Configure the LVS-DR configuration on the Web1 and WEB2 hosts.
1. Vim/etc/init.d/lvsdr_node (Web1 host)

#! /bin/sh 
# Descript:start Real Server Dr.
vip=192.168.96.100
./etc/rc.d/init.d/functions case
"$" in< C4/>start)
             echo "Start LVS of Realserver DR"
             /sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
  echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
             echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
               ;;
       Stop)
             /sbin/ifconfig lo:0 down
             echo "Close LVS of Realserver DR"
             echo "0" >/proc/sys/net/ipv4/conf/ All/arp_ignore
             echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
              ;
         *)
              echo "Usage: $ {start|stop}"
              exit 1
Esac

2. Copy this file to the WEB2 host.
3. Start this script separately on Web1 and WEB2:
/etc/init.d/lvsdr_node start

Seven, Web1 and WEB2 host on the Open httpd service.
/ETC/INIT.D/HTTPD start

# ================= TEST =======================================

Test if the load balance can be measured.
To write a test script:

#! /bin/sh for
((i=1;i<=100;i++));d o 
curl http://192.168.96.100:8099 >>/tmp/q;
Done

Results:


IX. Test Disconnect a Web service or join a Web service
Now turn off the WEB2 host (192.168.96.4) Web service.
View the log to see:


Now add the WEB2 host (192.168.96.4) Web services:
View the log to see:


Ten, Test ha
Now simulate Master (Master) 's keepalived host dies.
Log files for the standby machine:


You can see the keepalived of the standby has already begun to work ....

The entire deployment is complete.

Official reference Chinese Document: Http://www.keepalived.org/pdf/sery-lvs-cluster.pdf