keepalived+lvs_dr
一、keepalived+lvs-DR模式配置高可用负载均衡拓扑如下：
http://my.csdn.net/uploads/201206/16/1339841646_9963.jpg
二、服务器ip配置信息
1. ip_lb 主机(master) :
http://my.csdn.net/uploads/201206/17/1339868802_2154.jpg
2.ip_lb_2 主机 (backup)
http://my.csdn.net/uploads/201206/17/1339868877_2839.jpg
3.web1 主机
http://my.csdn.net/uploads/201206/16/1339843488_1431.jpg
4.web2 主机
http://my.csdn.net/uploads/201206/16/1339843535_4842.jpg
三、在master和backup分别查看是否有ipvsadm软件
1. 检查ipvsadm是否安装成功.可以直接输入
# ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
2. 检查模版是否加入内核
# lsmod |grep ip_vs
ip_vs 78081 0
四、分别在web1和web2上面安装apache服务.
#安装apache服务不说明了.开放的端口是:8099
五、在master主机(192.168.96.2)和backup主机(192.168.96.22)上安装keepalived
1. keepalived-1.2.1.tar.gz # 解压这个文件并且安装 (tar -zxvf keepalived-1.2.1.tar.gz)
2. ./configure --prefix=/home/keepalived/ --with-kernel-dir=/usr/src/kernels/2.6.18-164.el5-i686
3.make
4.make install
5.配置文件的路径
cp /home/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp /home/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /home/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /home/keepalived/sbin/keepalived /sbin/
6.配置keepalived.conf文件.( ip_lb 主机 )
vim /etc/keepalived/keepalived.conf
view plaincopy
[*] #global define
[*] global_defs {
[*] router_id LVS_T1
[*] }
[*]
[*]
[*] vrrp_sync_group bl_group {
[*] group {
[*] bl_one
[*] }
[*] }
[*]
[*] vrrp_instance bl_one {
[*] state MASTER
[*] interface eth0
[*] lvs_sync_daemon_interface eth0
[*] virtual_router_id 38
[*] priority 150
[*] advert_int 3
[*] authentication {
[*] auth_type PASS
[*] auth_pass 1111
[*] }
[*] virtual_ipaddress {
[*] 192.168.96.100
[*] }
[*] }
[*]
[*]
[*] virtual_server 192.168.96.100 8099 {
[*] delay_loop 3
[*] lb_algo rr
[*] lb_kind DR
[*] persistence_timeout 1
[*] protocol TCP
[*]
[*]
[*] real_server 192.168.96.33 8099 {
[*] weight 1
[*] TCP_CHECK {
[*] connect_timeout 10
[*] nb_get_retry 3
[*] delay_before_retry 3
[*] connect_port 8099
[*] }
[*]
[*] }
[*]
[*] real_server 192.168.96.4 8099 {
[*] weight 1
[*] TCP_CHECK {
[*] connect_timeout 10
[*] nb_get_retry 3
[*] delay_before_retry 3
[*] connect_port 8099
[*] }
[*] }
[*] }
7、配置keepalived.conf文件.(ip_lb_2 主机)
vim /etc/keepalived/keepalived.conf
copy view plain
[*] #global define
[*] global_defs {
[*] router_id LVS_T2
[*] }
[*]
[*]
[*] vrrp_sync_group bl_group {
[*] group {
[*] bl_one
[*] }
[*] }
[*]
[*] vrrp_instance bl_one {
[*] state BACKUP
[*] interface eth0
[*] lvs_sync_daemon_interface eth0
[*] virtual_router_id 38
[*] priority 120
[*] advert_int 3
[*] authentication {
[*] auth_type PASS
[*] auth_pass 1111
[*] }
[*] virtual_ipaddress {
[*] 192.168.96.100
[*] }
[*] }
[*]
[*]
[*] virtual_server 192.168.96.100 8099 {
[*] delay_loop 3
[*] lb_algo rr
[*] lb_kind DR
[*] persistence_timeout 1
[*] protocol TCP
[*]
[*]
[*] real_server 192.168.96.33 8099 {
[*] weight 1
[*] TCP_CHECK {
[*] connect_timeout 10
[*] nb_get_retry 3
[*] delay_before_retry 3
[*] connect_port 8099
[*] }
[*]
[*] }
[*]
[*] real_server 192.168.96.4 8099 {
[*] weight 1
[*] TCP_CHECK {
[*] connect_timeout 10
[*] nb_get_retry 3
[*] delay_before_retry 3
[*] connect_port 8099
[*] }
[*] }
[*] }
8. 分别在主备上启动keepalived
# /etc/init.d/keepalived start
Starting keepalived:
# tail -f /var/log/message
http://my.csdn.net/uploads/201206/17/1339870735_8872.jpg
# PS:这里说的LVS.并不是用ipvsadm软件配置.而是直接用keepalived的virtual_server配置项控制的.
#安装ipvsadm只是可以看到负载状况.其实只需要keepalived也可以实现负载均衡集群.
六、在web1和web2主机上配置LVS-DR的相关配置.
1. vim /etc/init.d/lvsDR_node （web1主机）
view plaincopy
[*] #! /bin/sh
[*] # descript : start real server DR
[*] VIP=192.168.96.100
[*] . /etc/rc.d/init.d/functions
[*] case "$1" in
[*] start)
[*] echo "start LVS of RealServer DR"
[*] /sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
[*] 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 of RealServer DR"
[*] 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
2. 把这个文件复制到web2主机上.
3. 在web1和web2上分别启动这个脚本:
/etc/init.d/lvsDR_node start
七、web1和web2主机上开启httpd服务.
/etc/init.d/httpd start
# ================= TEST =======================================
八、测试是否可以负载均衡.
编写测试脚本:
view plaincopy
[*] #! /bin/sh
[*] for((i=1;i> /tmp/q;
[*] done
结果:
http://my.csdn.net/uploads/201206/17/1339875821_8932.jpg
九、测试断开一个web服务或加入一个web服务
现在关闭 web2主机(192.168.96.4) 的web 服务..
查看日志可以看到:
http://my.csdn.net/uploads/201206/17/1339876121_7366.jpg
现在再把 web2主机(192.168.96.4)的web 服务加入进来:
查看日志可以看到:
http://my.csdn.net/uploads/201206/17/1339876287_8715.jpg
十、 测试HA
现在模拟主(master)的keepalived主机死掉.
备机的日志文件:
http://my.csdn.net/uploads/201206/17/1339877433_1304.jpg
可以看到备机的keepalived已经开始工作....
整个部署就完成了.
官方参考中文文档:http://www.keepalived.org/pdf/sery-lvs-cluster.pdf
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