Lvs别样的自动部署监控shell脚本
l 脚本功能:
l 实验环境图:
l 具体脚本:
l 结果验证:
l 参考资料:
先申明,本文现在已经在我公司的测试环境和生产测试环境使用。正式环境请用keepalived+lvs.
安装ipvsadm不多说了,先说说脚本的功能,脚本分为redirect server 端和realserver 端,脚本分别为 lvs_redirector.sh 和realserver.sh脚本。另外加一个监控脚本lvs_monitor.sh(此脚本来源网友,做了一点修改,算是 取之于网络,共享给网络吧)。
脚本功能:执行 lvs_redirector.sh nat|dr|tun|stop,中的一个选项可以启动或关闭相应的lvs模式,并调用lvs_monitor.sh 监控realserver。当realserver故障,或者重新启动时,自动删除,添加相应的realserver.当realserver 全故障时,自动添加redirector server 本地127.0.0.1的web页面的故障提示。当realserver只要有一台恢复时,自动添加相应的realserver,并删除127.0.0.1。
实验环境图:Lvs具体原理可以看我的博客:Lvs通俗易懂的总结 。
本文脚本的使用如下图的场景:
具体脚本:
lvs_redirector.sh 脚本如下:
#!/bin/bash # blog:http://qiaomiao.blog.51cto.com # # 20151223 v2.8 20160115 # home:http://www.qmlab.cn # # description:this script is use start lvs (nat/dr/tun),and stop lvs. #define the variable NAT_VIP="172.16.8.11" DR_VIP="10.0.8.20" TUN_VIP="10.0.8.20" DIP="10.0.8.11" RIP1="10.0.8.21" RIP2="10.0.8.22" RNET="10.0.8.0/24" DPORT=80 RPORT1=80 RPORT2=80 GATEWAY01=172.16.8.254 #做nat模式时,redirector 服务器的外网卡的路由器网关地址。 GATEWAY02=10.0.8.254 #路由器网关地址,做dr 和 tun 模式时用到。 #两个GATEWAY,请根据具体网络环境做取舍。 logfile=/tmp/myself_log/lvs.log #create log dir mkdir -p /tmp/myself_log # 在这个目录可以看到启动lvs日志。 #general funiction lvs_monitor(){ if [ $1 = stop ];then PS=`ps -ef |grep lvs_monitor.sh |awk '{printf $2" "}'` for X in `echo $PS` do kill -9 $X done else sh ./lvs_monitor.sh & fi } # LVS/NAT mode # start function nat_start { nat_stop VIP=$NAT_VIP echo 1 >/proc/sys/net/ipv4/ip_forward # start NAT mode ifconfig eth1 $VIP netmask 255.255.255.0 up route del -net 0.0.0.0 route add -net 0.0.0.0 netmask 0.0.0.0 gw $GATEWAY01 #ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.0 up ipvsadm -C ipvsadm -A -t $VIP:$DPORT -s wlc ipvsadm -a -t $VIP:$DPORT -r $RIP1:$RPORT1 -m -w 1 ipvsadm -a -t $VIP:$DPORT -r $RIP2:$RPORT2 -m -w 2 ipvsadm -ln ipvsadm -lnc } # stop function nat_stop { VIP=$NAT_VIP echo 0 >/proc/sys/net/ipv4/ip_forward # stop NAT mode ifconfig eth1 down route del -net 0.0.0.0 route add -net 0.0.0.0 netmask 0.0.0.0 gw $GATEWAY02 > /dev/null 2>&1 ipvsadm -C } # LVS/dricert routing mode # start function dr_start { dr_stop VIP=$DR_VIP echo 1 >/proc/sys/net/ipv4/ip_forward ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.255 up route add -host $VIP dev eth0:0 # start DR mode ipvsadm -C ipvsadm -A -t $VIP:$DPORT -s wlc ipvsadm -a -t $VIP:$DPORT -r $RIP1 -g -w 1 ipvsadm -a -t $VIP:$DPORT -r $RIP2 -g -w 2 ipvsadm -ln ipvsadm -lnc } # stop function dr_stop { VIP=$DR_VIP echo 0 >/proc/sys/net/ipv4/ip_forward ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.255 down route del -host $VIP dev eth0:0 > /dev/null 2>&1 # stop DR mode ipvsadm -C } # LVS/tunneling mode # start function tun_start { tun_stop VIP=$TUN_VIP # set interface #echo 1 >/proc/sys/net/ipv4/ip_forward ifconfig tunl0 $VIP broadcast $VIP netmask 255.255.255.255 up route add -host $VIP dev tunl0 # start tun mode ipvsadm -C ipvsadm -A -t $VIP:$DPORT -s wlc ipvsadm -a -t $VIP:$DPORT -r $RIP1 -i -w 1 ipvsadm -a -t $VIP:$DPORT -r $RIP2 -i -w 2 ipvsadm -ln ipvsadm -lnc } # stop function tun_stop { VIP=$TUN_VIP # set interface #echo 1 >/proc/sys/net/ipv4/ip_forward ifconfig tunl0 $VIP broadcast $VIP netmask 255.255.255.255 down ip addr flush tunl0 route del -host $VIP dev tunl0 >/dev/null 2>&1 # stop tun mode ipvsadm -C } service iptables stop case "$1" in nat) echo -e "\n `date +%F" "%H:%M:%S` nat模式启动...." > $logfile tun_stop dr_stop nat_start lvs_monitor $1 ;; dr) echo -e "\n `date +%F" "%H:%M:%S` dr模式启动...." > $logfile tun_stop nat_stop dr_start lvs_monitor $1 ;; tun) echo -e " \n `date +%F" "%H:%M:%S ` tun模式启动...." > $logfile dr_stop nat_stop tun_start lvs_monitor $1 ;; stop) echo -e "\n `date +%F" "%H:%M:%S` 关闭lvs...." > $logfile dr_stop nat_stop tun_stop lvs_monitor $1 ;; *) echo $"Usage: $0 {nat|dr|tun|stop}" ;; esac
lvs_realserver.sh 脚本如下:
#!/bin/bash # write by lijing QQ 858080796, # blog:http://qiaomiao.blog.51cto.com # 20151223 v2.8 20160115 # home:http://www.qmlab.cn # # description:this script is use start lvs (nat/dr/tun). #define the variable #NAT_VIP="10.0.8.20" DR_VIP="10.0.8.20" TUN_VIP="10.0.8.20" DIP="10.0.8.11" RIP1="10.0.8.21" RIP2="10.0.8.22" RNET="10.0.8.0/24" DPORT=80 RPORT1=80 RPORT2=80 GATEWAY="10.0.8.254" # # LVS/NAT mode # start function nat_start { nat_stop # set realserver gateway route del -net 0.0.0.0 route add -net 0.0.0.0 netmask 0.0.0.0 gw $DIP } # stop function nat_stop { # set realserver gateway route del -net 0.0.0.0 route add -net 0.0.0.0 netmask 0.0.0.0 gw $GATEWAY } # LVS/dricert routing mode # start function dr_start { dr_stop VIP=$DR_VIP # set interface ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up route add -host $VIP dev lo:0 # set realserver echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce } # stop function dr_stop { VIP=$DR_VIP # set interface ifconfig lo:0 down route del -host $VIP dev lo:0 >/dev/null 2>&1 # set realserver echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce } # LVS/tunneling mode # start function tun_start { tun_stop VIP=$TUN_VIP # set interface ifconfig tunl0 $VIP broadcast $VIP netmask 255.255.255.255 up route add -host $VIP dev tunl0 # set realserver echo 1 > /proc/sys/net/ipv4/conf/tunl0/arp_ignore echo 2 > /proc/sys/net/ipv4/conf/tunl0/arp_announce echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce echo 0 > /proc/sys/net/ipv4/conf/tunl0/rp_filter echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter } # stop function tun_stop { VIP=$TUN_VIP # set interface ip addr flush tunl0 ifconfig tunl0 down route del -host $VIP dev tunl0 >/dev/null 2>&1 # set realserver echo 0 > /proc/sys/net/ipv4/conf/tunl0/arp_ignore echo 0 > /proc/sys/net/ipv4/conf/tunl0/arp_announce echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce echo 0 > /proc/sys/net/ipv4/conf/tunl0/rp_filter echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter } service iptables stop case "$1" in nat) tun_stop dr_stop nat_start ;; dr) tun_stop nat_stop dr_start ;; tun) nat_stop dr_stop tun_start ;; stop) nat_stop dr_stop tun_stop ;; *) echo $"Usage: $0 {nat|dr|tun|stop}" ;; esac
lvs_monitor.sh 脚本如下:(注意要放在lvs_redirector.sh在同一个目录下)
#!/bin/bash # write by http://small.blog.51cto.com/259970/1728082 # 感谢 网友 super_color rs=("10.0.8.21" "10.0.8.22") vip="10.0.8.20" port=80 logfile="/tmp/myself_log/lvs_monitor.log" function check_alldown { #有一个rs主机能访问,就说明不是全部掉了 #检查到一个rs主机存活就退出检查 #如果全部rs不能访问,说明主机全掉了 for www in `echo ${rs[*]}` do curl --connect-timeout 1 http://$www &> /dev/null if [ $? -eq 0 ] then echo 0 exit 0 fi done echo 100 } function lvs_add { ipvsadm -a -t $vip:$port -r $1 echo "add rs host:$1 to lvs" } function lvs_rm { ipvsadm -d -t $vip:$port -r $1 echo "remove rs host:$1 to lvs" } function lvs_local { #如果全部rs主机掉线,并且lvs中没有127.0.0.1就添加它 #如果可以访问一个rs主机,并且lvs中有127.0.0.1就删除它 all_down=`check_alldown` rip=$(ipvsadm -L -n | gawk '/127.0.0.1/') if [ $all_down -eq 100 ] then if [ "$rip" = "" ] then echo "`date +%F:%H-%M-%S` all rs host is down!" >> $logfile lvs_add "127.0.0.1" fi else if [ $all_down -eq 0 ] && [ ! "$rip" = "" ] then echo "`date +%F:%H-%M-%S` one rs host is up,remove local rs host!" >> $logfile lvs_rm "127.0.0.1" fi fi } function lvs_rs { #如果可以访问一个rs主机,并且lvs中没有它就添加它 #如果不能访问一个rs主机,并且lvs中有它就删除它 lvs_local for www in `echo ${rs[*]}` do rip=$(ipvsadm -L -n | gawk "/$www/") curl --connect-timeout 1 http://$www &> /dev/null if [ $? -eq 0 ] then if [ "$rip" = "" ] then echo "`date +%F:%H-%M-%S` rs host:$www is up!" >> $logfile lvs_add "$www" fi else if [ ! "$rip" = "" ] then echo "`date +%F:%H-%M-%S` rs host:$www is down!" >> $logfile lvs_rm "$www" fi fi done } function lvs_monitor { while true do # echo "check lvs rs health!" lvs_rs sleep 1 done } lvs_monitor
结果验证:在验证结果之前,要保证你的路由器的端口映射是正确,且生效的,上面图中:
当外网客户端192.168.20.200访问时,nat模式路由器192.168.20.14映射到172.16.8.11这个IP,
dr和 tun模式映射到 10.0.8.20这个IP。
验证方法:先测试直接内网访问两台realserver web是不是正常,以及redirector server 的本地127.0.0.1 web 是不是正常,再测试访问192.168.20.14,当其中一台故障时是不是还可以访问,到全故障时,有没有切的本地127.0.0.1(故障提示页)的web,当其中只要有一台恢复时,会不会启动添加启用,并删除127.0.0.1的web.
本文是 巧妙绝情 一个字一个图打出来,参考了好多资料,感谢他们的分享,基于open source分享精神,转载请注明出出。
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参考资料:
http://small.blog.51cto.com/259970/1728082