带来一篇CentOS下Keepalived+LVS完成高可用集群

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软件：LVS+keepalived

LVS+Keepalived引见

LVS

LVS是LinuxVirtualServer的简写，意即Linux虚拟办事器，是一个虚拟的办事器集群体系。本项目在1998年5月由章文嵩博士成立，是中国国际最早涌现的自在软件项目之一。今朝有三种IP负载平衡技巧（VS/NAT、VS/TUN和VS/DR）；
十种调剂算法（rrr|wrr|lc|wlc|lblc|lblcr|dh|sh|sed|nq）。
Keepalvied
Keepalived在这里重要用作RealServer的安康状况检讨和LoadBalance主机和BackUP主机之间failover的完成



IP设置装备摆设信息:

• LVS-DR-Master192.168.2.166
  
  
• LVS-DR-BACKUP192.168.2.167
  
  
• LVS-DR-VIP192.168.2.170
  
  
• WEB1-Realserver192.168.2.171
  
  
• WEB2-Realserver192.168.2.172
  
  
• GateWay192.168.2.253
  装置LVS和Keepalvied软件包
  
  1.下载相干软件包
  #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
  
  2.装置LVS和Keepalived
  
  
• #lsmod|grepip_vs
  
  
• #uname-r
  
  
• 2.6.18-53.el5PAE
  
  
• #ln-s/usr/src/kernels/2.6.18-53.el5PAE-i686//usr/src/linux
  
  
• 
  
  
• #tarzxvfipvsadm-1.24.tar.gz
  
  
• #cdipvsadm-1.24
  
  
• #make&&makeinstall
  
  
• #find/-nameipvsadm#检查ipvsadm的地位
  
  
• 
  
  
• #tarzxvfkeepalived-1.1.15.tar.gz
  
  
• #cdkeepalived-1.1.15
  
  
• #./configure&&make&&makeinstall
  
  
• #find/-namekeepalived#检查keepalived地位
  
  
• 
  
  
• #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/
  
  
• #servicekeepalivedstart|stop#做成体系启动办事便利治理.
  四.设置装备摆设LVS完成负载平衡
  1．LVS-DR，设置装备摆设LVS剧本完成负载平衡
  
  vi/usr/local/sbin/lvs-dr.sh
  
  #!/bin/bash
  #description:startLVSofDirectorServer
  #Writtenby:NetSeek
  http://www.linuxtone.org
  GW=192.168.2.253
  
  #websitedirectorvip.
  WEB_VIP=192.168.2.170
  WEB_RIP1=192.168.2.171
  WEB_RIP2=192.168.2.172
  ./etc/rc.d/init.d/functions
  
  logger$0calledwith$1
  
  case"$1"in
  
  start)
  #Clearalliptablesrules.
  /sbin/iptables-F
  #Resetiptablescounters.
  /sbin/iptables-Z
  #Clearallipvsadmrules/services.
  /sbin/ipvsadm-C
  
  #setlvsvipfordr
  /sbin/ipvsadm--set30560
  /sbin/ifconfigeth0:0$WEB_VIPbroadcast$WEB_VIPnetmask255.255.255.255up
  /sbin/routeadd-host$WEB_VIPdeveth0:0
  /sbin/ipvsadm-A-t$WEB_VIP:80-swrr-p3
  /sbin/ipvsadm-a-t$WEB_VIP:80-r$WEB_RIP1:80-g-w1
  /sbin/ipvsadm-a-t$WEB_VIP:80-r$WEB_RIP2:80-g-w1
  touch/var/lock/subsys/ipvsadm>/dev/null2>&1
  
  #setArp
  /sbin/arping-Ieth0-c5-s$WEB_VIP$GW>/dev/null2>&1
  ;;
  stop)
  /sbin/ipvsadm-C
  /sbin/ipvsadm-Z
  ifconfigeth0:0down
  routedel$WEB_VIP>/dev/null2>&1
  rm-rf/var/lock/subsys/ipvsadm>/dev/null2>&1
  /sbin/arping-Ieth0-c5-s$WEB_VIP$GW
  echo"ipvsadmstoped"
  ;;
  
  status)
  
  if[!-e/var/lock/subsys/ipvsadm];then
  echo"ipvsadmisstoped"
  exit1
  else
  ipvsadm-ln
  echo"..........ipvsadmisOK."
  fi
  ;;
  
  *)
  echo"Usage:$0{start|stop|status}"
  exit1
  esac
  
  exit0
  2．设置装备摆设Realserver剧本.
  
  #!/bin/bash
  #WrittenbyNetSeek
  #description:Configrealserverloandapplynoarp
  WEB_VIP=192.168.2.170
  
  ./etc/rc.d/init.d/functions
  
  case"$1"in
  start)
  ifconfiglo:0$WEB_VIPnetmask255.255.255.255broadcast$WEB_VIP
  /sbin/routeadd-host$WEB_VIPdevlo: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/null2>&1
  echo"RealServerStartOK"
  
  ;;
  stop)
  ifconfiglo:0down
  routedel$WEB_VIP>/dev/null2>&1
  echo"0">/proc/sys/net/ipv4/conf/lo/arp_ignore
  echo"0">/proc/sys/net/ipv4/conf/lo/arp_announce
  echo"0">/proc/sys/net/ipv4/conf/all/arp_ignore
  echo"0">/proc/sys/net/ipv4/conf/all/arp_announce
  echo"RealServerStoped"
  ;;
  status)
  #StatusofLVS-DRrealserver.
  islothere=`/sbin/ifconfiglo:0|grep$WEB_VIP`
  isrothere=`netstat-rn|grep"lo:0"|grep$web_VIP`
  if[!"$islothere"-o!"isrothere"];then
  #Eithertherouteorthelo:0device
  #notfound.
  echo"LVS-DRrealserverStopped."
  else
  echo"LVS-DRRunning."
  fi
  ;;
  *)
  #Invalidentry.
  echo"$0:Usage:$0{start|status|stop}"
  exit1
  ;;
  esac
  exit0
  
  附上realserver机上的/etc/sysctl.conf：
  
  #KernelsysctlconfigurationfileforRedHatLinux
  #
  #Forbinaryvalues,0isdisabled,1isenabled.Seesysctl(8)and
  #sysctl.conf(5)formoredetails.
  #ControlsIPpacketforwarding
  net.ipv4.ip_forward=1
  #Controlssourcerouteverification
  net.ipv4.conf.default.rp_filter=1
  #Donotacceptsourcerouting
  net.ipv4.conf.default.accept_source_route=0
  #ControlstheSystemRequestdebuggingfunctionalityofthekernel
  kernel.sysrq=0
  #ControlswhethercoredumpswillappendthePIDtothecorefilename.
  #Usefulfordebuggingmulti-threadedapplications.
  kernel.core_uses_pid=1
  net.ipv4.conf.lo.arp_ignore=1
  net.ipv4.conf.lo.arp_announce=2
  net.ipv4.conf.all.arp_ignore=1
  net.ipv4.conf.all.arp_announce=2
  或许采取secondaryipaddress方法设置装备摆设
  #vi/etc/sysctl.conf
  
  添加以下内容如上所示：
  
  net.ipv4.conf.lo.arp_ignore=1
  net.ipv4.conf.lo.arp_announce=2
  net.ipv4.conf.all.arp_ignore=1
  net.ipv4.conf.all.arp_announce=2
  #sysctlCp
  #ipaddradd61.164.122.8/32devlo
  #ipaddlist检查能否绑定
  3.启动lvs-dr剧本和realserver启本，在DR上可以检查LVS以后状况:
  #watchipvsadmCln
  
  五．应用Keepalvied完成负载平衡和和高可用性
  
  1.设置装备摆设在主负载平衡办事器上设置装备摆设keepalived.conf
  #vi/etc/keepalived/keepalived.conf(主调剂器)
  !ConfigurationFileforkeepalived
  global_defs{
  notification_email{
  
  acassen@firewall.loc
  
  failover@firewall.loc
  
  sysadmin@firewall.loc
  }
  notification_email_from
  Alexandre.Cassen@firewall.loc
  smtp_server127.0.0.1
  smtp_connect_timeout30
  router_idLVS_DEVEL
  }
  vrrp_instanceVI_1{
  stateMASTER
  interfaceeth0
  virtual_router_id51
  priority100
  advert_int1
  authentication{
  auth_typePASS
  auth_pass1111
  }
  virtual_ipaddress{
  192.168.2.170
  }
  }
  virtual_server192.168.2.17080{
  delay_loop6
  lb_algowrr
  lb_kindDR
  persistence_timeout60
  protocolTCP
  
  real_server192.168.2.17180{
  weight3
  TCP_CHECK{
  connect_timeout10
  nb_get_retry3
  delay_before_retry3
  connect_port80
  }
  }
  real_server192.168.2.17280{
  weight3
  TCP_CHECK{
  connect_timeout10
  nb_get_retry3
  delay_before_retry3
  connect_port80
  }
  }
  }
  
  在备用调剂器上：
  #vi/etc/keepalived/keepalived.conf(备用调剂器)
  !ConfigurationFileforkeepalived
  global_defs{
  notification_email{
  
  acassen@firewall.loc
  
  failover@firewall.loc
  
  sysadmin@firewall.loc
  }
  notification_email_from
  Alexandre.Cassen@firewall.loc
  smtp_server127.0.0.1
  smtp_connect_timeout30
  router_idLVS_DEVEL
  }
  vrrp_instanceVI_1{
  stateBACKUP
  interfaceeth0
  virtual_router_id51
  priority99
  advert_int1
  authentication{
  auth_typePASS
  auth_pass1111
  }
  virtual_ipaddress{
  192.168.2.170
  }
  }
  virtual_server192.168.2.17080{
  delay_loop6
  lb_algowrr
  lb_kindDR
  persistence_timeout60
  protocolTCP
  
  real_server192.168.2.17180{
  weight3
  TCP_CHECK{
  connect_timeout10
  nb_get_retry3
  delay_before_retry3
  connect_port80
  }
  }
  real_server192.168.2.17280{
  weight3
  TCP_CHECK{
  connect_timeout10
  nb_get_retry3
  delay_before_retry3
  connect_port80
  }
  }
  }
  
  2.BACKUP办事器同上设置装备摆设，先装置lvs再按装keepalived,仍后设置装备摆设/etc/keepalived/keepalived.conf，只需将白色标示的部门改一下便可.
  3.vi/etc/rc.local
  #/usr/local/sbin/lvs-dr.sh将lvs-dr.sh这个剧本正文失落。
  #/usr/local/sbin/lvs-dr.shstop停滞lvs-dr剧本
  #/etc/init.d/keepalivedstart启动keepalived办事，keepalived就可以应用keepalived.conf配
  置文件，完成负载平衡和高可用.
  4.检查lvs办事能否正常
  
  #watchipvsadmCln
  IPVirtualServerversion1.2.1(size=4096)
  ProtLocalAddressortSchedulerFlags
  ->RemoteAddressortForwardWeightActiveConnInActConn
  TCP61.164.122.8:80wrrpersistent60
  ->61.164.122.10:80Route300
  ->61.164.122.9:80Route300
  复制代码
  #tailCf/var/log/message监听日记，检查状况，测试LVS负载平衡及高可用性能否有用。
  5．停Master办事器的keepalived办事，检查BAKCUP办事器能否能正常接收办事。
  四．相干参考
  1．LVS基本常识汇总
  LVS的算法引见
  http://www.linuxtone.org/viewthread.php?tid=69
  进修LVS的三种转发形式
  http://www.linuxtone.org/viewthread.php?tid=77
  LVS中的IP负载平衡技巧
  http://www.linuxtone.org/viewthread.php?tid=68
  更多的请到
  http://www.linuxtone.org
  负载平衡版检查
  Keepalived相干参考材料。
  
  http://www.keepalived.org/documentation.html
  
  

如果您觉得本篇CentOSLinux教程讲得好，请记得点击右边漂浮的分享程序，把好文章分享给你的小伙伴们！

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