CentOS5.5环境下布署LVS+keepalived

dirtysea 发表于 2010-12-21 09:55:51

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#!/bin/bash # BY kerryhu # MAIL:king_819@163.com # BLOG:http://kerry.blog.51cto.com # Please manual operation yum of before Operation..... 系统环境`：CentOS 5.5（定制安装） 组件： Base Development Libraries Development Tools Editors Text-based Internet
lvs-master：192.168.9.201 lvs-backup：192.168.9.202 vip：192.168.9.200 web1：192.168.9.203 web2：192.168.9.204 netmask：255.255.255.0 gateway：192.168.9.1
网络拓扑： 
<A href="http://img1.51cto.com/attachment/201010/154055336.jpg" target=_blank><IMG onclick='window.open("http://blog.51cto.com/viewpic.php?refimg=" + this.src)' border=0 alt="" src="http://img1.51cto.com/attachment/201010/154055336.jpg" onload="if(this.width>650) this.width=650;"></A>
echo "============================ 更新系统时间 ======================" yum install -y ntp ntpdate time.nist.gov echo "00 01 * * * /usr/sbin/ntpdate time.nist.gov" /etc/crontab
echo “============================ 关闭不用服务 =======================” /root/del_servcie.sh           # 附件中自定义脚本
echo “========================= 安装ipvsadm、keepalived ==================” # cd /usr/local/src # wget <A href="http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz">http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz</A> # wget <A href="http://www.keepalived.org/software/keepalived-1.1.17.tar.gz">http://www.keepalived.org/software/keepalived-1.1.17.tar.gz</A> # ln -sv /usr/src/kernels/2.6.18-194.el5-i686/ /usr/src/linux # tar -zxvf ipvsadm-1.24.tar.gz # cd ipvsadm-1.24 # make;make install # cd .. # tar -zxvf keepalived-1.1.17.tar.gz # cd keepalived-1.1.17 # ./configure configure: error:   !!! OpenSSL is not properly installed on your system. !!!   !!! Can not include OpenSSL headers files. 解决办法： # yum -y install openssl-devel # ./configure # make;make install 编译的时候出现这个提示，说明keepalived和内核结合了，如果不是这样的，需要加上这个参数./configure --with-kernel-
dir=/kernel/path Keepalived configuration ------------------------ Keepalived version       : 1.1.17 Compiler                 : gcc Compiler flags           : -g -O2 Extra Lib                : -lpopt -lssl -lcrypto Use IPVS Framework       : Yes IPVS sync daemon support : Yes Use VRRP Framework       : Yes Use LinkWatch            : No Use Debug flags          : No
echo “======================= 配置keepalived ===========================” #  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/sbin/keepalived /usr/sbin/ # vi /etc/keepalived/keepalived.conf ! Configuration File for keepalived   global_defs {    notification_email {       <A href="mailto:king_819@163.com">king_819@163.com</A>    }    notification_email_from <A href="mailto:king_819@163.com">king_819@163.com</A>    smtp_server smtp.163.com   # smtp_connect_timeout 30    router_id LVS_DEVEL }   # VIP1 vrrp_instance VI_1 {     state MASTER             #备份服务器上将MASTER改为BACKUP       interface eth0     lvs_sync_daemon_inteface eth0     virtual_router_id 51     priority 100    # 备份服务上将100改为90     advert_int 5     authentication {         auth_type PASS         auth_pass 1111     }     virtual_ipaddress {         192.168.9.200           #(如果有多个VIP，继续换行填写.)     } }   virtual_server 192.168.9.200 80 {     delay_loop 6                  #(每隔10秒查询realserver状态)     lb_algo wlc                  #(lvs 算法)     lb_kind DR                  #(Direct Route)     persistence_timeout 60        #(同一IP的连接60秒内被分配到同一台realserver)     protocol TCP                #(用TCP协议检查realserver状态)       real_server 192.168.9.203 80 {         weight 100               #(权重)         TCP_CHECK {         connect_timeout 10       #(10秒无响应超时)         nb_get_retry 3         delay_before_retry 3         connect_port 80         }     }     real_server 192.168.9.204 80 {         weight 100         TCP_CHECK {         connect_timeout 10         nb_get_retry 3         delay_before_retry 3         connect_port 80         }      } } #  service keepalived start|stop # chkconfig –level 2345 keepalived on
echo “====================== 配置realserver =========================” # vi /root/lvs_real.sh #!/bin/bash # description: Config realserver #Written by : <A href="http://kerry.blog.51cto.com/">http://kerry.blog.51cto.com</A>
SNS_VIP=192.168.9.200   /etc/rc.d/init.d/functions   case "$1" in start)        /sbin/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)        /sbin/ifconfig lo:0 down        /sbin/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
# chmod +x /roo/lvs_real.sh # /root/lvs_real.sh start # ifconfig<A href="http://img1.51cto.com/attachment/201010/154138720.jpg" target=_blank><IMG onclick='window.open("http://blog.51cto.com/viewpic.php?refimg=" + this.src)' border=0 alt="" src="http://img1.51cto.com/attachment/201010/154138720.jpg" onload="if(this.width>650) this.width=650;"></A>
# echo “/root/lvs_real.sh start” >> /etc/rc.local
echo “===================== 测试LVS+keepalived ========================” #LVS_master、LVS_backup上开启keepalived，LVS_master先绑定VIP LVS_master：
<A href="http://img1.51cto.com/attachment/201010/154209809.jpg" target=_blank><IMG onclick='window.open("http://blog.51cto.com/viewpic.php?refimg=" + this.src)' border=0 alt="" src="http://img1.51cto.com/attachment/201010/154209809.jpg" onload="if(this.width>650) this.width=650;"></A>
LVS_backup：
<A href="http://img1.51cto.com/attachment/201010/154241173.jpg" target=_blank><IMG onclick='window.open("http://blog.51cto.com/viewpic.php?refimg=" + this.src)' border=0 alt="" src="http://img1.51cto.com/attachment/201010/154241173.jpg" onload="if(this.width>650) this.width=650;"></A>
#解析域名，测试访问，LVS转发
<A href="http://img1.51cto.com/attachment/201010/154407568.jpg" target=_blank><IMG onclick='window.open("http://blog.51cto.com/viewpic.php?refimg=" + this.src)' border=0 alt="" src="http://img1.51cto.com/attachment/201010/154407568.jpg" onload="if(this.width>650) this.width=650;"></A>
#测试关闭LVS_master，短暂的掉包后，LVS_backup马上接替工作
<A href="http://img1.51cto.com/attachment/201010/154438783.jpg" target=_blank><IMG onclick='window.open("http://blog.51cto.com/viewpic.php?refimg=" + this.src)' border=0 alt="" src="http://img1.51cto.com/attachment/201010/154438783.jpg" onload="if(this.width>650) this.width=650;"></A>
 LVS_backup接替LVS_master绑定VIP
<A href="http://img1.51cto.com/attachment/201010/154506634.jpg" target=_blank><IMG onclick='window.open("http://blog.51cto.com/viewpic.php?refimg=" + this.src)' border=0 alt="" src="http://img1.51cto.com/attachment/201010/154506634.jpg" onload="if(this.width>650) this.width=650;"></A>
LVS_backup负责转发
<A href="http://img1.51cto.com/attachment/201010/154530799.jpg" target=_blank><IMG onclick='window.open("http://blog.51cto.com/viewpic.php?refimg=" + this.src)' border=0 alt="" src="http://img1.51cto.com/attachment/201010/154530799.jpg" onload="if(this.width>650) this.width=650;"></A>
LVS_master重启完成后，就会自动接回控制权，继续负责转发
<A href="http://img1.51cto.com/attachment/201010/154552509.jpg" target=_blank><IMG onclick='window.open("http://blog.51cto.com/viewpic.php?refimg=" + this.src)' border=0 alt="" src="http://img1.51cto.com/attachment/201010/154552509.jpg" onload="if(this.width>650) this.width=650;"></A>
#测试关闭其中一台realserver
<A href="http://img1.51cto.com/attachment/201010/154613452.jpg" target=_blank><IMG onclick='window.open("http://blog.51cto.com/viewpic.php?refimg=" + this.src)' border=0 alt="" src="http://img1.51cto.com/attachment/201010/154613452.jpg" onload="if(this.width>650) this.width=650;"></A>
通过上面测试可以知道，当realserver故障或者无法提供服务时，负载均衡器通过健康检查自动把失效的机器从转发队列删除掉，
实现故障隔离，保证用户的访问不受影响
#重启被关闭的realserver
<A href="http://img1.51cto.com/attachment/201010/154632533.jpg" target=_blank><IMG onclick='window.open("http://blog.51cto.com/viewpic.php?refimg=" + this.src)' border=0 alt="" src="http://img1.51cto.com/attachment/201010/154632533.jpg" onload="if(this.width>650) this.width=650;"></A>
当realserver故障恢复后，负载均衡器通过健康检查自动把恢复后的机器添加到转发队列中 
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CentOS5.5环境下布署LVS+keepalived