Step by Step build LVS-DR model lb cluster (ii)

Persistent connection of LVS:

A persistent connection is a forwarding method that does not consider LVS, ensuring that all connections from the same user are forwarded to the same realserver

-P//indicates that this connection is a persistent connection
N//Indicates the time to maintain this persistent connection. The default is 6 minutes.

Types of persistent connections:

1.PCC (Persistent client connector, persistent user connection) all requests from the same user are located on the same realserver within the time-out range, when the port is specified with port 0, and all requests are forwarded.
All requests of the 2.PPC (persistent port connector) user are located on different RS within the timeout range according to the port.
3. Firewall tag: The associated port on the firewall with the same mark, the user access to the two associated services, will be located on the same realserver.

PCC instance

Ipvsadm-a-T 192.168.1.110:0-S RR-P 600

PPC is based on the different services, directed to different Realserver, in the directory to write a few more ipvsadm point, note that the port to distinguish between the line

Persistent connection for firewall tagging

Iptables-t mangle-a prerouting-d 192.168.1.110-p tcp--dport 80-j Mark--set-mark 10 destinations 1982.168.1.110:80 marked as 10ipvs Adm-a-F 10-s rr-p 60//Use the 10 defined above to define the Cluster service ipvsadm-a-F 10-r 192.168.1.116-g/For cluster definition realserveripvsadm-a-f 10-r 192.1 68.1.117-g

Simple back-Office RS Health Monitoring script

#!/bin/bash#vip=192.168.1.110cport=80fail_back=127.0.0.1fbstatus=0rs= ("192.168.1.116"   "192.168.1.117") Rstatus= ("1"   "1") rw= ("2"   "1") Rport=80type=gadd ()  {  ipvsadm -a -t  $VIP : $CPORT  -r $1: $RPORT  -$TYPE  -w $2  [ $? -eq 0 ]  && return 0 | |  return 1}del ()  {  ipvsadm -d -t  $VIP: $CPORT  -r $1: $RPORT   [ $? -eq 0 ] && return 0 | |  return 1}while :; do  let count=0  for i in ${rs[ *]}; do    if curl --connect-timeout 1 http://$I  &>  /dev/null; then      if [ ${rstatus[$COUNT]} -eq  0 ]; then         add  $I  ${rw[$COUNT]}          [ $? -eq 0 ] && rstatus[$COUNT] =1      fi    else      if  [ ${rstatus[$COUNT]} -eq 1 ]; then          del  $I          [ $? -eq 0 ]  && rstatus[$COUNT]=0      fi    fi     let count++  done  sleep 5done

This article is from the "Linux is belong to You" blog, make sure to keep this source http://jwh5566.blog.51cto.com/7394620/1664077

Step by Step build LVS-DR model lb cluster (ii)