Memcached+magent Implementing Master-Slave synchronization +keepalived high-availability clusters

Memcached+magent implementation of Master-slave synchronization +keepalived High Availability cluster Introduction

Memcached is a high-performance distributed memory object caching system for dynamic Web applications to mitigate database load. It improves the speed of dynamic, database-driven Web sites by caching data and objects in memory to reduce the number of times a database is read. Memcached is based on a hashmap that stores key/value pairs. Its daemon (daemon) is written in C, but the client can write in any language and communicate with the daemon through the memcached protocol.

Experimental deployment

Host name	IP Address	main Service Software
Memcached Primary Server	172.16.10.138	Memcached,libevent,magent,keepalived
Memcached from the server	172.16.10.137	Memcached,libevent,keepalived
Client	172.16.10.134	Telnet test

• Configure memcached Primary cache node Server
  Tar XF libevent-2.1.8-stable.tar.gz-c/opt
  Tar xf memcached-1.5.6.tar.gz-c/opt
  Tar XF magent-0.5.tar.gz-c/opt

  cd/opt/libevent-2.1.8
  ./configure--prefix=/usr #指定安装路径
  Make && Make install #编译安装

  cd/opt/memcached-1.5.6
  ./configure--with-libevent=/usr #指定安装路径
  Make && make Install #编译安装

  Ln-s/usr/lib/libevent-2.1.so.6/usr/lib64/libevent-2.1.so.6 #主服务器上magent服务需要这个模块

  Cd/opt /magent
  Vim ketama.h

  #ifndef ssize_max #修改
  #define SSIZE_MAX 32767 #修改
  #endif

  Vim Makefile
  LIBS =-levent-lm #修改, add-lm

  Make

  cp mgent/usr/bin #把生成的mgent程序让系统识别

• Configuring memcached from a cache node server

  Tar xzvf memcached-1.5.6.tar.gz-c/opt
  Tar xzvf libevent-2.1.8-stable.tar.gz-c/opt

  cd/opt/libevent-2.1.8
  ./configure--PREFIX=/USR
  Make && make install

  cd/opt/memcached-1.5.6
  ./configure--WITH-LIBEVENT=/USR
  Make && make I nstall

  Ln-s/usr/lib/libevent-2.1.so.6/usr/lib64/libevent-2.1.so.6 #主服务器上magent服务需要这个模块

• The master server copies the magent files to the slave server

  Yum Install openssh-clients

  SCP magent [Email protected]:/usr/bin///Copy the resulting magent file directly to the slave server.

• Primary Server Install keepalived service, modify configuration file

  Yum-y install keepalived

  vim/etc/keepalived/keepalived.conf

    router_id Magent_ha #router_id主从不能相同, to modify the  

  Vrrp_script magent {
  Script "/opt/shell/magent.sh"
  Interval 2
  } #定义一个新函数, automatically execute this script every 2s

  vrrp_ Instance vi_1 {
  State MASTER #这边是主服务器, from server is Backup
  interface ens33 #网卡接口是ens33
  virtual_router_id *
  Priority #优先级, from server smaller than primary server
  Advert_int 1
  Authentication {
  Auth_type PASS
  auth_pass 1111
  }

  Track_script {
  magent #出发执行magent脚本
  }

  Virtual_ipaddress {
  172.16.10.200 #虚拟IP (VIP)
  }
  }

    Remove all of the following additional configuration  

• Primary Server Install keepalived service, modify configuration file

  Yum-y install keepalived

  vim/etc/keepalived/keepalived.conf

    router_id MAGENT_HB #router_id主从不相同  

  Vrrp_script magent {
  Script "/opt/shell/magent.sh"
  Interval 2
  } #定义一个新函数, automatically execute this script every 2s

  vrrp_ Instance vi_1 {
  State MASTER #这边是从服务器, Backup
  interface ens33 #网卡接口是ens33
  virtual_router_id *
  Priority 90 #优先级, the server is smaller than the primary server
  Advert_int 1
  Authentication {
  Auth_type PASS
  auth_pass 1111
  }

  Track_script {
  magent #出发执行magent脚本
  }

  Virtual_ipaddress {
  172.16.10.200 #虚拟IP (VIP)
  }
  }
  Remove all of the following redundant configuration

• Home Server writing magnet script

  Mkdir/opt/shell

  vim/opt/shell/magent.sh

    #!/bin/bash  

  k= ps-ef | grep keepalived | grep-v grep | wc-l
  If [$K-gt 0]; then
  Magent-u root-n 5120 0-l 192.168.58.100-p 12000-s 192.168.58.135:11211-b 192.168.58.132:11211
  Else
  pkill-9 magent
  Fi

  -N 51 #定义用户最大连接数
  -L 192.168.58.100 #指定虚拟IP
  -P 12000 #指定端口号
  -S #指定主缓存服务器
  -B #指定从缓存服务器

  # This script means that once the keepalived process is detected in the system process, the magent command is executed, and if not, the magent process is killed. In a way, there is no keepslived process on the primary server, and Magent is connected to the server.

    chmod +x/opt/shell/magent.sh  

  #给脚本添加执行权限

• Writing magent scripts from the server

  Mkdir-p/opt/shell
  vim/opt/shell/magent.sh

  #!/bin/bash
  k=ip addr | grep 192.168.58.100 | grep -v grep | wc -l
  If [$K-gt 0]; Then
  Magent-u root-n 51200-l 192.168.58.100-p 12000-s 192.168.58.135:11211-b 192.168.58.132:11211
  Else
  Pkill-9 magent
  Fi
  #从服务器的脚本意思就是检测到虚拟ip漂移是否到自己身上, if the VIP is drifting to the slave server, the magent command will be executed to start the server normally when the primary server is down.

• Experimental validation

First use the client to install Telnet, remote connection VIP node, after writing to the user, the master-slave cache server will automatically obtain the download of the user.

Memcached+magent Implementing Master-Slave synchronization +keepalived high-availability clusters