LVS+KEEPALIVED负载均衡

时间 2019-12-20

标签 lvs+keepalived lvs keepalived 负载均衡栏目负载均衡繁體版

原文原文链接

1、环境准备 Master-lvs：192.168.0.5 Backup-lvs：192.168.0.10 App-web01：192.168.0.15 App-web02192.168.0.20 VIP：192.168.0.50

2、部署master-lvs服务器 javascript

修改内核参数 vi /etc/sysctl.conf html

net.ipv4.conf.lo.arp_ignore = 1 java

安装ipvsadm软件 linux

wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz web

tar zxvf ipvsadm-1.24.tar.gz 后端

cd ipvsadm-1.24 bash

ln -s /usr/src/kernels/2.6.18-128.el5-PAE-i686 /usr/src/linux 服务器

make 并发

make install ide

安装Keepalived包

ln -s /usr/src/kernels/2.6.18-128.el5-PAE-i686 /usr/src/linux

wget http://www.keepalived.org/software/keepalived-1.1.17.tar.gz
tar -xvzf keepalived-1.1.17.tar.gz
cd keepalived-1.1.17
./configure --sysconfdir=/etc/ --sbindir=/usr/sbin/

make&make install

修改keepalived.conf

!Configuration File for keepalived

global_defs {

notification_email {

lvze@163.com

}

notification_email_from lzspf@163.com

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL_1

}

vrrp_instance VI_1 {

state MASTER

interface eth0

virtual_router_id 51

priority 150

advert_int 1

authentication {

auth_type PASS

auth_pass 1234

}

virtual_ipaddress {

192.168.0.50

}

virtual_server 192.168.0.50 80 {

delay_loop 6

lb_algo wrr

lb_kind DR

persistence_timeout 50

protocol TCP

real_server 192.168.0.15 80 {

weight 3

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

real_server 192.168.0.20 80 {

weight 3

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

3、部署Backup-lvs服务器

安装ipvsadm以及keepalived的包

内核参数须要修改以下值：

net.ipv4.conf.lo.arp_ignore = 1

将master-lvs上的配置文件拷贝到Backup-lvs服务器上

在master-lvs上运行以下命令拷贝到backup-lvs上面前提是ipvsadm和keepalived已经安装。

Scp /etc/keepalived/keepalived.conf 192.168.0.10:/etc/keepalived/

Scp /sbin/lvsdr.sh 192.168.0.10:/sbin

可能须要输入密码进行文件的传输

主要修改keepalived的配置文件,标红的位置是须要修改的。

!Configuration File for keepalived

global_defs {

notification_email {

lvze@163.com

}

notification_email_from lzspf@163.com

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL_2

}

vrrp_instance VI_1 {

state BACKUP

interface eth0

virtual_router_id 51

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1234

}

virtual_ipaddress {

192.168.0.50

}

virtual_server 192.168.0.50 80 {

delay_loop 6

lb_algo wrr

lb_kind DR

persistence_timeout 50

protocol TCP

real_server 192.168.0.15 80 {

weight 3

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

real_server 192.168.0.20 80 {

weight 3

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

分别在master和backup运行keepalived服务

/etc/init.d/keepalived start

4、配置后端WEB服务器

在192.168.0.15和192.168.0.20上分别创建以下脚本。

vi /sbin/realdr.sh

#!/bin/bash

VIP=172.16.83.126

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

/sbin/route add -host $VIP dev lo:0

echo "1">/proc/sys/net/ipv4/conf/default/arp_ignore

echo "2">/proc/sys/net/ipv4/conf/default/arp_announce

echo "1">/proc/sys/net/ipv4/conf/all/arp_ignore

echo "2">/proc/sys/net/ipv4/conf/all/arp_announce

sysctl -p

配置权限

chmod 755 /sbin/realdr.sh

在两台web服务器上分别执行其指命。

/sbin/realdr.sh start

5、模拟故障测试

测试keepalived

1 当我把master的lvs服务关掉的时候，会将用户请求自动切换到backup上面进行工做。

中止Master-LVS的keepalived服务，人为形成故障
[root@Master-LVS]# service keepalived stop

这时查看Backup-LVS的log信息
[root@Backup-LVS]# tail -f /var/log/message

?[Copy to clipboard]View Code LOG

Sep 3 11:23:28 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE

Sep 3 11:23:29 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE

Sep 3 11:23:29 localhost Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.

Sep 3 11:23:29 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.108.180

Sep 3 11:23:29 localhost Keepalived_vrrp: Netlink reflector reports IP 192.168.0.50 added

Sep 3 11:23:29 localhost Keepalived_healthcheckers: Netlink reflector reports IP 192.168.0.50 added

Sep 3 11:23:34 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.0.50

由日志能够看出，Backup-LVS监测到Master-LVS故障后当即将本身的身份切换为Master而后将VIP设置到本身的eth0端口上并发送ARP广播。

如今我手动将Master-LVS的keepalived的服务起来，而后再查看Backup-LVS的log信息
[root@Master-LVS]# service keepalived start

[root@Backup-LVS]# tail -f /var/log/message

?[Copy to clipboard]View Code LOG

Sep 3 11:30:44 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Received higher prio advert

Sep 3 11:30:44 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Entering BACKUP STATE

Sep 3 11:30:44 localhost Keepalived_vrrp: VRRP_Instance(VI_1) removing protocol VIPs.

Sep 3 11:30:44 localhost Keepalived_vrrp: Netlink reflector reports IP 192.168.0.50 removed

Sep 3 11:30:44 localhost Keepalived_healthcheckers: Netlink reflector reports IP 192.168.0.50 removed

由Backup-LVS的日志能够看到，其检测到比本身优先级高的实例后将本身的身份切换成了Backup，而后将VIP从eth0端口移除，并发送心跳给Master-LVS。

测试lvs

1当我把web服务关掉的时候，lvs上面会显示web消失，当启用后，web会自动显示

Web20关闭后：

[root@localhost ~]# ipvsadm -ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddressort Scheduler Flags

-> RemoteAddressort Forward Weight ActiveConn InActConn

TCP 192.168.0.50:80 wrr

-> 192.168.0.15:80 Route 10 0 0

[root@localhost ~]# ipvsadm -ln

Web20启用后：

root@localhost ~]# ipvsadm -ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddressort Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.0.50:80 wlc

-> 192.168.0.15:80 Route 1 0 0

-> 192.168.0.20:80 Route 1 0 0