Keepalived+LVS-DR方式配置高可用负载均衡集群

环境: 虚拟机:VMware Workstation

          操作系统:CentOS 5.5

 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<master> )
vim /etc/keepalived/keepalived.conf
#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 <backup> )
vim /etc/keepalived/keepalived.conf
#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
[root@ip_lb home]# /etc/init.d/keepalived start
Starting keepalived: [  OK  ]

[root@ip_lb home]# tail -f /var/log/message


# 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）
#! /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:
#! /bin/sh for((i=1;i<=100;i++));do curl http://192.168.96.100:8099 >> /tmp/q; done
结果:


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:


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:


十、 测试HA
现在模拟主(master)的keepalived主机死掉.
备机的日志文件:


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