LVS + Keepalived DR Mode

LVS + Keepalived DR Mode

Installation and deployment of LVS + Keepalived
 
Front-end master scheduling: IP address> 10.252.3.10
Frontend scheduling backup: IP> 10.252.3.11
VIP: 10.252.3.12
RealServer: 10.252.3.15
RealServer: 10.252.3.16
1: Install keepalivedipvsadm together with the master and slave nodes.
Yum installkeepalived ipvsadm-y
Note: You can use ipvsadm-Ln to view the LVS scheduling status.
 
 
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2: Configure/etc/keepalived. conf.
The configuration of host 10.252.3.10 is as follows:
Vrrp_instanceVI_1 {
State MASTER # What is the difference between the MASTER and slave databases?
Interface eth1 # corresponding Nic
Virtual_router_id 60
Priority 101 # priority, who is the master (the greater the value, the higher the priority)
Advert_int 2
Authentication {# authentication method, and the password must be the same as the Master/Slave Password
Auth_type PASS
Auth_pass 1234 # Password
}
Virtual_ipaddress {# Switch Mode. Switch virtual IP Address
10.252.3.12/4
}
}
Virtual_server10.252.3.12 80 {# the corresponding port can be modified here
Delay loop 6 # health check time
Lb_algo rr # There are 12 balanced scheduling algorithms. The Round-Robin method is used here.
Lb_kind DR # There are three forwarding rules for Server Load balancer: NAT, DR, And TUN
Real_server 10.252.3.15 80 {
Weight 3
TCP_CHECK {# tcp polling check settings
Connect_timeout 3
Nb_get_retry 3
Delay_before_retry 3
Connect_port 80
}
}
Real_server 10.252.3.16 80 {
Weight 3
TCP_CHECK {# tcp polling check settings
Connect_timeout 3
Nb_get_retry 3
Delay_before_retry 3
Connect_port 80
}
}
}
 
Backup Machine configuration: 10.252.3.11
The keepalived configuration of Backup is mainly to modify two places, and the others are the same:
State BACKUP # What is the difference between the master and slave databases?
Priority 100 # priority, who is the master (the greater the value, the higher the priority)
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3: run the script on realserver
Because DR is used, we need to deploy the DIP address and VIP address on the actual Virtual Machine for communication.
The script for compiling lvs_init.sh is as follows. The lvs_init scripts of the two backend VMS are the same:
#! /Bin/bash
# Description: Config realserver lo and apply noarp
SNS_VIP = 10.252.3.12
./Etc/rc. d/init. d/functions
Case "$1" in
Start)
Ifconfig lo: 0 $ SNS_VIP netmask000000000000255 broadcast $ SNS_VIP up # Set lo: 0 IP Address
/Sbin/route add-host $ SNS_VIP dev lo: 0 # add a route
Echo "1">/proc/sys/net/ipv4/conf/lo/arp_ignore
Echo "2">/proc/sys/net/ipv4/conf/lo/arp_announce
Echo "1">/proc/sys/net/ipv4/conf/all/arp_ignore
Echo "2">/proc/sys/net/ipv4/conf/all/arp_announce
Sysctl-p>/dev/null 2> & 1 # Update Configuration
Echo "RealServer Start OK"
;;
Stop)
Ifconfig lo: 0 down
Route del $ SNS_VIP>/dev/null2> & 1
Echo "0">/proc/sys/net/ipv4/conf/lo/arp_ignore
Echo "0">/proc/sys/net/ipv4/conf/lo/arp_announce
Echo "0">/proc/sys/net/ipv4/conf/all/arp_ignore
Echo "0">/proc/sys/net/ipv4/conf/all/arp_announce
Echo "RealServer Stoped"
;;
*)
Echo "Usage: $0 {start | stop }"
Exit 1
Esac
Exit 0
 
Grant the script permission chmod + x/data/script/lvs_init.sh
./Lvs_init start/stop run and stop scripts
Service keepalived start
Use ipvsadm-Ln to view lvs Server Load balancer. You can use webbech for testing.

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For more information about Keepalived, click here.
Keepalived: click here

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