2018-4-11 Linux Learning Notes

18.11 LVS Dr Mode construction

• The LVS NAT mode requires fewer public IP addresses and is suitable for up to 10 servers. Then the DR mode is more suitable for large-scale speech.
• (1) Prepare three machines
• Dispatcher, also known as the Scheduler (dir)
  192.168.168.129
• Rs1
  192.168.168.130
• Rs2
  192.168.168.131

• VIP (need to set up on all three machines)
  192.168.168.200

• (2) Scripting on Dir
• vim/usr/local/sbin/lvs_dr.sh
• Add content as follows
  ----------------------------------------------------------------------------------------------
  #! /bin/bash
  Echo 1 >/proc/sys/net/ipv4/ip_forward
  ipv=/usr/sbin/
  Ipvsadm
  vip=192.168.168.200
  rs1=192.168.168.130
  rs2=192.168.168.131
  #注意这里的网卡名字
  Ifdown Ens33
  Ifup Ens33
  #以上2句作用是让再次执行脚本时不用再次设置vip
  Ifconfig ens33:2 $VIP broadcast $VIP netmask 255.255.255.255 up
  Route add-host $vip Dev ens33:2
  $IPV-C
  $IPV-A-t $VIP: 80-s WRR
  $IPV-A-t $vip: 80-r $rs 1:80-g-W 1
  $IPV-A-t $vip: 80-r $rs 2:80-g-W 1
  ----------------------------------------------------------------------------------------------
  Note: -G in the last 2 lines above represents the DR Mode .

• Set the execution script to complete
  sh/usr/local/sbin/lvs_dr.sh

• (3) scripts are also written on both Rs
• vim/usr/local/sbin/lvs_rs.sh
• Add content as follows
  ----------------------------------------------------------------------------------------------------------
  #/bin/bash
  vip=192.168.168.200
  #把vip绑定在lo上, is to implement RS directly return the results to the client
  Ifdown Lo
  Ifup Lo
  Ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
  Route Add-host $vip lo:0
  #以下操作为更改arp内核参数 to enable RS to send the MAC address to the client successfully
  #参考文档www. cnblogs.com/lgfeng/archive/2012/10/16/2726308.html
  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
  ---------------------------------------------------------------------------------------------------------
• Execute these scripts on Dir and two RS respectively
  sh/usr/local/sbin/lvs_rs.sh
• (4) Dr Mode Test
  Access VIP 192.168.168.200 in the browser
  

18.12 keepalived + LVS DR

• Extended Learning:
  Haproxy+keepalived http://blog.csdn.net/xrt95050/article/details/40926255
  Nginx, LVS, haproxy comparison http://www.csdn.net/article/2014-07-24/2820837
  Custom Script Vrrp_script http://my.oschina.net/hncscwc/blog/158746 in keepalived
  The LVS Dr Mode only uses a public IP implementation method http://storysky.blog.51cto.com/628458/338726

2018-4-11 Linux Learning Notes