Xenserver 虚拟机下配置LVS+keepalived
Xenserver 虚拟机下配置LVS+keepalived测试环境：
思杰xenserver 5.5
与vmware 和真实机不一样需要安装kernel-xen并切换至Xen内核启动
之前是物理机配置。一路正常。今天却遇到了问题。所以做个记录。
测试机相关信息：
LVS-DR-Master 192.1.1.36
LVS-DR-BACKUP 192.1.1.37
LVS-DR-VIP 192.1.1.38
WEB1-Realserver 192.1.1.31
WEB2-Realserver 192.1.1.32
GateWay 192.1.1.1
一、系统配置
安装相应的包：yum -y install kernel-xen kernel-devel openssl openssl-devel
修改menu.lst文件：
[*]# more /boot/grub/menu.lst
[*]# grub.conf generated by anaconda
[*]#
[*]# Note that you do not have to rerun grub after making changes to this file
[*]# NOTICE:You have a /boot partition.This means that
[*]# all kernel and initrd paths are relative to /boot/, eg.
[*]# root (hd0,0)
[*]# kernel /vmlinuz-version ro root=/dev/xvda2
[*]# initrd /initrd-version.img
[*]#boot=/dev/xvda
[*]default=0
[*]timeout=5
[*]splashimage=(hd0,0)/grub/splash.xpm.gz
[*]hiddenmenu
[*]#title CentOS (2.6.18-128.1.10.el5.xs5.5.0.51xen)
[*]# root (hd0,0)
[*]# kernel /vmlinuz-2.6.18-128.1.10.el5.xs5.5.0.51xen ro root=LABEL=/ console=xvc0 rhgb quiet
[*]# initrd /initrd-2.6.18-128.1.10.el5.xs5.5.0.51xen.img
[*]title CentOS (2.6.18-92.el5xen)
[*] root (hd0,0)
[*] kernel /vmlinuz-2.6.18-92.el5xen ro root=LABEL=/ console=xvc0 rhgb quiet
[*] initrd /initrd-2.6.18-92.el5xen.img
#uname -r
2.6.18-128.el5xen
#ln -s /usr/src/kernels/2.6.18-128.el5xen-x86_64/ /usr/src/linux
二、安装相应的包
#mkdir /usr/local/src/lvs
#cd /usr/local/src/lvs
#wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz
#wget http://www.keepalived.org/software/keepalived-1.1.15.tar.gz
[*]#lsmod |grep ip_vs
[*] #tar zxvf ipvsadm-1.24.tar.gz
[*] #cd ipvsadm-1.24
[*]#make && make install
[*] #find / -name ipvsadm# 查看ipvsadm的位置
[*]
[*]#tar zxvf keepalived-1.1.15.tar.gz
[*] #cd keepalived-1.1.15
[*]#./configure&& make && make install
[*]#find / -name keepalived# 查看keepalived位置
[*] #cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
[*] #cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
[*] #mkdir /etc/keepalived
[*] #cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
[*] #cp /usr/local/sbin/keepalived /usr/sbin/
[*] #service keepalived start|stop # 做成系统启动服务方便管理.
三、配置keepalived
[*]! Configuration File for keepalived
[*]
[*]global_defs {
[*] router_id LVS_DEVEL
[*]}
[*]
[*]vrrp_sync_group VGM {
[*] group {
[*] VI_OUT1
[*] }
[*]}
[*]
[*]#vip1
[*]vrrp_instance VI_OUT1 {
[*] state MASTER
[*] interface eth0
[*] virtual_router_id 51
[*] priority 100
[*] advert_int 1
[*] authentication {
[*] auth_type PASS
[*] auth_pass 1111
[*] }
[*] virtual_ipaddress {
[*] 192.1.1.38
[*] }
[*]}
[*]
[*]virtual_server 192.1.1.38 80 {
[*] delay_loop 6
[*] lb_algo rr
[*] lb_kind DR
[*] persistence_timeout 50
[*] protocol TCP
[*]
[*] real_server 192.1.1.31 80 {
[*] weight 100
[*] TCP_CHECK {
[*] connect_timeout 3
[*] nb_get_retry 3
[*] delay_before_retry 3
[*] connect_port 80
[*] }
[*] }
[*]
[*] real_server 192.1.1.32 80 {
[*] weight 100
[*] TCP_CHECK {
[*] connect_timeout 3
[*] nb_get_retry 3
[*] delay_before_retry 3
[*] connect_port 80
[*] }
[*] }
[*]}
Backup 机器的keepalived需要修改：
State BACKUP
weight 10 数值比master小即可
四、客户端绑定VIP
脚本：
[*]#vi /usr/local/sbin/realserver.sh
[*] #!/bin/bash
[*] SNS_VIP=192.1.1.38（只需要修改此处）
[*] . /etc/rc.d/init.d/functions
[*]
[*] case "$1" in
[*] start)
[*] ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
[*] /sbin/route add -host $SNS_VIP dev 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"
[*] ;;
[*] stop)
[*] ifconfig lo:0 down
[*] route del $SNS_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"
[*] ;;
[*] *)
[*] echo "Usage: $0 {start|stop}"
[*] exit 1
[*] esac
[*] exit 0
五、测试客户端绑定VIP
启动脚本。使用ip a 查看是否在lo绑定了VIP停止后消失。
六、启动master backup 的keepalived查看日志。是否正常。
启动客户端apache 定义一个index.html 即可测试
本文不写测试过程。
就是停WEB1 再停WEB2 再停master看backup是否接管
七、错误
之前是在真实机上搞、一步没有出错。今天在Xenserver上需要注意一定要切到Xen内核启动。
由于配置客户端apache时。习惯性指定了listen IP：80 这是个错误。
原因：客户端绑定VIP后。监听127.0.0.1 80 用这个与LVS端进行通讯。
如果指定IP需要加上127 要不然就会出现拒绝请求的错误。
这个问题折腾了我一下午。在秋香的帮助下得到解决。低级错误了。长记性了。
参考：linuxtone sery.blog.运维网.com
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