CentOS7 Keepalived+LVS 实现高可用

摘要: CentOS7操作系统下，使用Keepalived+LVS 实现高可用性

系统环境：

操作系统：Centos7.2

依赖软件：net-tools

网络环境：

Keepalived Master：192.168.5.251

Keepalived Backup：192.168.5.252

VIP： 192.168.5.100

RIP： 192.168.5.254

Keepalived Master

! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_mantaince_down {
script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
interval 1
weight 2
}

vrrp_instance VI_1 {
state MASTER
interface eno16777736
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
}
virtual_ipaddress {
192.168.5.100/24 label eno16777736:0
}
track_script {
chk_mantaince_down
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault  "/etc/keepalived/notify.sh fault"
}
virtual_server 192.168.5.100 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.255.255
persistence_timeout 50
protocol TCP
#
real_server 192.168.5.254 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
}
}
}

Keepalived Backup

! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Casse
3ff0
n@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_mantaince_down {
script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
interval 1
weight 2
}

vrrp_instance VI_1 {
state BACKUP
interface eno16777736
virtual_router_id 51
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
}
virtual_ipaddress {
192.168.5.100/24 label eno16777736:0
}
track_script {
chk_mantaince_down
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault  "/etc/keepalived/notify.sh fault"
}
virtual_server 192.168.5.100 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.255.255
persistence_timeout 50
protocol TCP
#
real_server 192.168.5.254 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
}
}
}

Real Script

#!/bin/bash
#!/bin/bash
#chkconfig: 2345 79 20
#description:LVS realserver
DR_VIP=192.168.5.100

case "$1" in
start)
/sbin/ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
/sbin/route add -host $SNS_VIP dev lo:0
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
echo "LVS RealServer Start OK"
;;
stop)
ifconfig lo:0 down
route del $SNS_VIP >/dev/null 2>&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 "LVS RealServer Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac

notify Scrip

# !/bin/bash
# Author: MageEdu <linuxedu@foxmail.com>
# description: An example of notify script
#
vip=172.16.100.1
contact='root@localhost'
notify() {
mailsubject="`hostname` to be $1: $vip floating"
mailbody="`date '+%F %H:%M:%S'`: vrrp transition, `hostname` changed to be $1"
echo $mailbody | mailx -s "$mailsubject" $contact
}
case "$1" in
master)
notify master
exit 0
;;
backup)
notify backup
exit 0
;;
fault)
notify fault
exit 0
;;
*)
echo 'Usage: `basename $0` {master|backup|fault}'
exit 1
;;
esac