构建高可用服务器之五 Keepalive冗余LVS
LVS只是做一个负载均衡，通过访问VIP来访问后端的网站程序，一旦LVS宕机，整个网站就访问不了，这就出现了单点。所以要结合keepalive这种高可用软件来保证整个网站的高可用。本文将介绍如何利用keepalive来实现LVS的高可用(以LVS的DR模式为例，生产环境后台的real server 网站内容是一致的，为了看到实验效果，这里是两个不同的页面)。一、环境介绍
VIP：192.168.1.188
RIP1(Web1): 192.168.1.2
RIP2(Web2): 192.168.1.5
LVS1 :192.168.1.6
LVS2: 192.168.1.7
web1页面
http://s3.运维网.com/wyfs02/M00/6D/89/wKioL1Vlx4HRVzwsAAB4QQhSn2A022.jpg
web2页面
http://s3.运维网.com/wyfs02/M00/6D/8D/wKiom1VlxfGT8hXeAAB26U4-POA544.jpg
二、配置realserver
分别在web1和web2上执行lvs_rserver.sh
# ./lvs_rserver.shstart
RealServer Start OK
#
# ./lvs_rserver.shstart
RealServer Start OK
# lvs_rserver.sh脚本内容如下：
# cat lvs_rserver.sh
#!/bin/sh
#LVS Client Server
VIP=192.168.1.188
case $1in
start)
ifconfig lo:0$VIPnetmask255.255.255.255broadcast$VIP
/sbin/routeadd –host$VIPdev 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 "RealServer Start OK"
exit 0
;;
stop)
ifconfig lo:0 down
route del $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 "RealServer Stoped OK"
exit 1
;;
*)
echo "Usage: $0 {start|stop}"
;;
esac
# 三、安装配置lvs及keepalive
分别在lvs1和lvs2上安装lvs及keepalive
lvs及keppalive的安装见《构建负载均衡服务器之二 LVS详解及应用》 《构建高可用服务器之一 Keepalive介绍及安装》
在lvs1和lvs2上配置VIP并加载相关模块
# ifconfig eth0:0192.168.1.188 netmask 255.255.255.0
# modprobe ip_vs
# modprobe ip_vs_rr
# modprobe ip_vs_wrr
## ifconfig eth0:0192.168.1.188 netmask 255.255.255.0
# modprobe ip_vs
# modprobe ip_vs_rr
# modprobe ip_vs_wrr
# 在lvs1上修改keepalive.conf文件，修改后内容如下
# vim/etc/keepalived/keepalived.conf
# cat/etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
654001593@qq.com
}
notification_email_from 654001593@qq.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
# VIP1
vrrp_instance VI_1 {
state MASTER
interface eth0
lvs_sync_daemon_inteface eth0
virtual_router_id 51
priority 100
advert_int 5
nopreempt
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.188
}
}
virtual_server 192.168.1.188 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
# persistence_timeout 60
protocol TCP
real_server 192.168.1.2 80 {
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.1.5 80 {
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
# lvs2上的keepalive.conf文件基本和lvs1上的一致，但是state这一项lvs1上是MASTER，而lvs2上的BACKUP；优先级priority在lvs1上为100，在lvs2上为90
在lvs2上修改keepalive.conf文件，修改后内容如下
# cat/etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
654001593@qq.com
}
notification_email_from 654001593@qq.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
# VIP1
vrrp_instance VI_1 {
state BACKUP
interface eth0
lvs_sync_daemon_inteface eth0
virtual_router_id 51
priority 90
advert_int 5
nopreempt
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.188
}
}
virtual_server 192.168.1.188 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
# persistence_timeout 60
protocol TCP
real_server 192.168.1.2 80 {
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.1.5 80 {
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
# 四、测试
停掉lvs1的网卡
去ping VIP一样一直在通信(配置有nopreempt)
http://s3.运维网.com/wyfs02/M01/6D/8D/wKiom1VlxjbCuoE_AAKXVkxtx28353.jpg
通过VIP访问网站
http://s3.运维网.com/wyfs02/M02/6D/89/wKioL1Vlx8jAZwxQAAC-GF1rLm0878.jpg
刷新
http://s3.运维网.com/wyfs02/M02/6D/89/wKioL1Vlx8nzo7YPAACYbDYOU9o621.jpg
即使lvs1宕机后又恢复，此时依旧是通过lvs2访问(由是否配置nopreempt决定）。
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