Keepalived + LVS high-availability Load Balancing

 

1. Install keepalived on two scheduling servers)
Vim/etc/yum. repo. d/rhel. repo
[Local-cdrom]
Name = local from cdrom
Baseurl = file: // mnt/
Enable = 1
Gpgcheck = 0

Yum-y install kernel-devel openssl-devel popt-devel
Rpm-ivh/mnt/Packgets/ipvsadm-1.25-9.el6.i686.rpm
Tar zxvf keepalived-1.2.2.tar.gz-C/usr/src/
Cd/usr/src/keepalived-1.2.2/
./Configure -- prefix =/-- with-kernel-dir =/usr/src/kernels/2.6.32-131.0.15.el6.i686
Make & make install
Chkconfig -- add keepalived
Chkconfig keepalived on
2. Configure the scheduler master: 192.168.13.95, slave: 192.168.13.96, drifting ip: 192.168.13.100) web Server pool Node 1: 192.168.13.41, node 2: 192.168.13.47)
1) configure the master HA scheduling Server
Cd/etc/keepalived/
Cp keepalived. conf keepalived. conf. bak
Vi/etc/keepalived. conf
################# Global configuration ################## 33
Global_defs {
Router_id LVS_HA_R1
}
################## HA settings ##############
Vrrp_instance VI_1 {
State MASTER
Interface eth0
Virtual_route_id 1
Priority100
Advert_int 1
Authentication {
Auth_type PASS
Auth_pass 123123
}
Virtual_ipaddress {
192.168.13.100
}
}
################### Server pool configuration ################# #####
Virtual_server 192.168.13.100 80 {
Delay_loop 15
Lb_algo rr
Lb_kind DR
Protocol TCP
Real_server 192.168.13.41 80 {
Weight 1
TCP_CHECK {
Connect_port 80
Connect_timeout 3
Nb_get_retry 3
Delay_before_retry 4
}
}
Real_server 192.168.13.41 80 {
Weight 1
TCP_CHECK {
Connect_port 80
Connect_timeout 3
Nb_get_retry 3
Delay_before_retry 4
}
}
}

Modprobe ip_vs
Lsmod | grep ip_vs
Echo "modprobe ip_vs">/etc/rc. local
/Etc/init. d/keepalived restart
Chkconfig ipvsadm off
Ip addr show dev eth0
2) configure the HA slave scheduling Server
Cd/etc/keepalived/
Cp keepalived. conf keepalived. conf. bak
Vi/etc/keepalived. conf
################# Global configuration ################## 33
Global_defs {
Router_id LVS_HA_R2
}
################## HA settings ##############
Vrrp_instance VI_1 {
State SLAVE
Interface eth0
Virtual_route_id 1
Priority 99
Advert_int 1
Authentication {
Auth_type PASS
Auth_pass 123123
}
Virtual_ipaddress {
192.168.13.100
}
}
################### Server pool configuration ################# #####
Virtual_server 192.168.13.100 80 {
Delay_loop 15
Lb_algo rr
Lb_kind DR
Protocol TCP
Real_server 192.168.13.41 80 {
Weight 1
TCP_CHECK {
Connect_port 80
Connect_timeout 3
Nb_get_retry 3
Delay_before_retry 4
}
}
Real_server 192.168.13.47 80 {
Weight 1
TCP_CHECK {
Connect_port 80
Connect_timeout 3
Nb_get_retry 3
Delay_before_retry 4
}
}
}

Modprobe ip_vs
Lsmod | grep ip_vs
Echo "modprobe ip_vs">/etc/rc. local
/Etc/init. d/keepalived restart
Chkconfig ipvsadm off
Ip addr show dev eth0
###### Set the firewall and selinux here for testing )#########
Iptables-F
Setenforce 0

3. Configure the DR working mode of the Web node server and make the following settings on the node server respectively)
Cd/etc/sysconfig/network-script/
Cp ifcfg-lo: 0
Vi ifcfg-lo: 0
DEVICE = lo: 0
IPADDR = 192.168.13.100
NETMASK = 255.255.255.255.255
ONBOOT = yes

Echo "route add-host 192.168.13.100 dev lo: 0">/etc/rc. local
Route add-host 192.168.13.100 dev lo: 0
Ip addr show dev lo

Vi/etc/sysctl. conf
Net. ipv4.conf. all. arp_ignore = 1
Net. ipv4.conf. all. arp_announce = 2
Net. ipv4.conf. default. arp_ignore = 1
Net. ipv4.conf. default. arp_announce = 2
Net. ipv4.conf. lo. arp_ignore = 1
Net. ipv4.conf. lo. arp_announce = 2

Sysctl-p
Yum install-y httpd
Vi/var/www/html/index.html
Test page !!!!

/Etc/init. d/httpd start
Chkconfig httpd on
Iptables-F
Setenforce 0

4. Test the high-availability cluster of lvs + Keepalived
When the client browser accesses 192.168.13.100, the scheduling server may be broken down, and at least one node server must be good.
Use the/var/log/message log File to track the Failover process. Use ipvsadm-Ln to view LVS.