Lvs+keepalived实现负载均衡、故障剔除(DR模式)

Node1: 192.168.1.253

Node2: 192.168.1.254

VIP: 192.168.1.250

环境 centos5.2（我这里是用两台机实现的）

1、安装ipvsadm

yum -y install ipvsadm

2、安装keepalived

[root@node1 ~]# wget http://www.keepalived.org/software/keepalived-1.1.15.tar.gz

[root@node1 ~]# tar zxvf keepalived-1.1.15.tar.gz

[root@node1 ~]# cd keepalived-1.1.15

[root@node1 keepalived-1.1.15]# ./configure --prefix=/ --mandir=/usr/local/share/man/ --with-kernel-dir=/usr/src/kernels/2.6.18-92.el5-i686/

configure后会输入这结果为正确

Keepalived configuration

------------------------

Keepalived version : 1.1.15

Compiler : gcc

Compiler flags : -g -O2

Extra Lib : -lpopt -lssl -lcrypto

Use IPVS Framework : Yes #支持lvs

IPVS sync daemon support : Yes

Use VRRP Framework : Yes

Use LinkWatch : No

Use Debug flags : No

[root@node1 keepalived-1.1.15]# make && make install

到此，lvs+keepalived安装完成。但是还不能使用lvs功能，接下来以dr模式配置lvs+keepalived

3、[root@node1 ~]# cd /etc/keepalived/

[root@node1 keepalived]# vim keepalived.conf

! Configuration File for keepalived

global_defs {

notification_email {

shanswei@gmail.com

}

notification_email_from shanswei@gmail.com

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_instance VI_1 {

state MASTER ##主lvs设置成master

interface eth0

virtual_router_id 51

priority 102 ##从lvs设置成 99

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.1.250 ## 如多个vip，继续换行填写。

}

virtual_server 192.168.1.250 80 {

delay_loop 6

lb_algo wlc

lb_kind DR

persistence_timeout 50

protocol TCP

real_server 192.168.1.253 80 {

weight 3

TCP_CHECK {

connect_port 80

connect_timeout 30

}

real_server 192.168.1.254 80 {

weight 1

TCP_CHECK {

connect_port 80

connect_timeout 30

}

好了，keepalived配置完成了。

启动keepalived
[root@node1 ~]# /etc/init.d/keepalived start
如果要随系统启动，执行chkconfig --add keepalived
chkconfig keepalived on

4、接着配置真实服务器，这里通过脚本来实现吧(这个脚本只在WEB机上执行，我现在是用两台机。服务器既充当lvs、也充当web机)

[root@node1 keepalived]# vim realserver

#!/bin/bash

#description : start realserver

VIP=192.168.1.250

/etc/rc.d/init.d/functions

case "$1" in

start)

echo " start LVS of REALServer"

/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up

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

;;

stop)

/sbin/ifconfig lo:0 down

echo "close LVS Directorserver"

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 "Usage: $0 {start|stop}"

exit 1

esac

[root@node1 keepalived]# chmod +x realserver

[root@node1 keepalived]# ./realserver start

5、启动keepalived (附启动日志)

[root@node1 ~]# /etc/init.d/keepalived start (主LVS)

Oct 15 13:59:36 vmtest Keepalived: Starting Keepalived v1.1.15 (10/15,2009)

Oct 15 13:59:36 vmtest Keepalived_healthcheckers: Using MII-BMSR NIC polling thread...

Oct 15 13:59:36 vmtest Keepalived_healthcheckers: Netlink reflector reports IP 192.168.1.253 added

Oct 15 13:59:36 vmtest Keepalived_healthcheckers: Netlink reflector reports IP 10.0.0.253 added

Oct 15 13:59:36 vmtest Keepalived_healthcheckers: Registering Kernel netlink reflector

Oct 15 13:59:36 vmtest Keepalived_healthcheckers: Registering Kernel netlink command channel

Oct 15 13:59:36 vmtest Keepalived_healthcheckers: Opening file '/etc/keepalived/keepalived.conf'.

Oct 15 13:59:36 vmtest Keepalived_healthcheckers: Configuration is using : 11891 Bytes

Oct 15 13:59:36 vmtest Keepalived_healthcheckers: Activating healtchecker for service [192.168.1.253:80]

Oct 15 13:59:36 vmtest Keepalived_healthcheckers: Activating healtchecker for service [192.168.1.254:80]

Oct 15 13:59:36 vmtest Keepalived: Starting Healthcheck child process, pid=28419

Oct 15 13:59:36 vmtest Keepalived_vrrp: Using MII-BMSR NIC polling thread...

Oct 15 13:59:36 vmtest Keepalived_vrrp: Netlink reflector reports IP 192.168.1.253 added

Oct 15 13:59:36 vmtest Keepalived: Starting VRRP child process, pid=28420

Oct 15 13:59:36 vmtest Keepalived_vrrp: Netlink reflector reports IP 10.0.0.253 added

Oct 15 13:59:36 vmtest Keepalived_vrrp: Registering Kernel netlink reflector

Oct 15 13:59:36 vmtest Keepalived_vrrp: Registering Kernel netlink command channel

Oct 15 13:59:36 vmtest Keepalived_vrrp: Registering gratutious ARP shared channel

Oct 15 13:59:36 vmtest Keepalived_vrrp: Opening file '/etc/keepalived/keepalived.conf'.

Oct 15 13:59:36 vmtest Keepalived_vrrp: Configuration is using : 36278 Bytes

Oct 15 13:59:36 vmtest Keepalived_vrrp: VRRP sockpool: [ifindex(2), proto(112), fd(8,9)]

Oct 15 13:59:37 vmtest Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE

Oct 15 13:59:38 vmtest Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE

Oct 15 13:59:38 vmtest Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.

Oct 15 13:59:38 vmtest Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.1.250

Oct 15 13:59:38 vmtest Keepalived_healthcheckers: Netlink reflector reports IP 192.168.1.250 added

Oct 15 13:59:38 vmtest avahi-daemon[2580]: Registering new address record for 192.168.1.250 on eth0.

Oct 15 13:59:38 vmtest Keepalived_vrrp: Netlink reflector reports IP 192.168.1.250 added

Oct 15 13:59:43 vmtest Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.1.250

[root@node1 ~]# /etc/init.d/keepalived start (从LVS)

Oct 15 15:40:26 node1 Keepalived: Starting Keepalived v1.1.15 (10/12,2009)

Oct 15 15:40:26 node1 Keepalived_healthcheckers: Using MII-BMSR NIC polling thread...

Oct 15 15:40:26 node1 Keepalived: Starting Healthcheck child process, pid=11157

Oct 15 15:40:26 node1 Keepalived: Starting VRRP child process, pid=11159

Oct 15 15:40:26 node1 Keepalived_vrrp: Using MII-BMSR NIC polling thread...

Oct 15 15:40:26 node1 Keepalived_vrrp: Registering Kernel netlink reflector

Oct 15 15:40:26 node1 Keepalived_vrrp: Registering Kernel netlink command channel

Oct 15 15:40:26 node1 Keepalived_vrrp: Registering gratutious ARP shared channel

Oct 15 15:40:26 node1 Keepalived_vrrp: Opening file '/etc/keepalived/keepalived.conf'.

Oct 15 15:40:26 node1 Keepalived_vrrp: Configuration is using : 36712 Bytes

Oct 15 15:40:26 node1 Keepalived_vrrp: VRRP_Instance(VI_1) Entering BACKUP STATE

Oct 15 15:40:26 node1 Keepalived_vrrp: VRRP sockpool: [ifindex(2), proto(112), fd(7,8)]

Oct 15 15:40:26 node1 Keepalived_healthcheckers: Registering Kernel netlink reflector

Oct 15 15:40:26 node1 Keepalived_healthcheckers: Registering Kernel netlink command channel

Oct 15 15:40:26 node1 Keepalived_healthcheckers: Opening file '/etc/keepalived/keepalived.conf'.

Oct 15 15:40:26 node1 Keepalived_healthcheckers: Configuration is using : 12417 Bytes

Oct 15 15:40:26 node1 Keepalived_healthcheckers: Activating healtchecker for service [192.168.1.253:80]

Oct 15 15:40:26 node1 Keepalived_healthcheckers: Activating healtchecker for service [192.168.1.254:80]

绿色字体表示启动成功

6、测试，我现在停掉主lvs上面的keepalived，从lvs会出现以下日志，表示从lvs能正常接管主的lvs，从而实现lvs主从互备功能，当主lvs的keepalived启动后。会自动切换回来

[root@node1 ~]# tali -f /var/log/messages

Oct 15 15:43:18 node1 Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE

Oct 15 15:43:19 node1 Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE

Oct 15 15:43:19 node1 Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.

Oct 15 15:43:19 node1 Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.1.250

Oct 15 15:43:19 node1 avahi-daemon[3087]: Registering new address record for 192.168.1.250 on eth0.

Oct 15 15:43:24 node1 Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.1.250

7、测试down机，比如我这机跑的是web服务，我现在停止apache，出现以下现像

绿线画的是lvs正常，当我停止httpd的时候，再看lvs时，192.168.1.253这个IP已不在lvs表中（画红线处），因为我停掉了httpd服务。

我再启动httpd服务时，再查看lvs，192.168.1.253又自动加进表中（画蓝线处），此时已实现了负载均衡、故障剔除功能。

8、心得

这个配置只需要两个软件就可以了，ipvsadm、keepalived，再加上一个脚本，这个脚本只在
web机上执行

还有keepalived的配置文件，在一台机上配置好了之后，直接拷到另一台机去，拷到另一台
机只需要改动两个地方
vrrp_instanceVI_1{

    stateMASTER       ##主lvs设置成master
    interfaceeth0
    virtual_router_id51

priority102 ##从lvs设置成 99
stateMASTER 如果是从lvs，则改成BACKUP，priority102 改为小于100.

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Lvs+keepalived实现负载均衡、故障剔除(DR模式)

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