memcached Implementing primary master replication and keepalive high-availability methods

Experimental topology

Experimental environment

Server	IP Address	Operating System	main software
Memcached1	192.168.144.122	centos7.3	libevent2.1.8, memcached1.5.6, KeepAlive, Telnet, magent0.5
Memcached2	192.168.144.129	centos7.3	Libevent, memcached, KeepAlive, Telnet
Client	192.168.144.141	centos7.3	Lamp Architecture or Telnet

Configuration of the Memcached1

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

• 1, first install libevent, specify the installation path, MEMCACHED2 on the same operation

Cd/opt/libevent-2.1.8-stable
./configure--prefix=/usr/local/libevent
Make && make install

• 2, install the same operation on Memcached,memcached2

cd/opt/memcached-1.5.6
./configure \
--prefix=/usr/local/memcached \
--with-libevent=/usr/local/libevent/#需要跟上事件通知库模块

Make && make install

• 3, let memcached command can let the system identification, MEMCACHED2 on the same operation

Ln-s/usr/local/memcached/bin/*/usr/local/bin/

• 4. Copy the compiled and installed libevent-2.1.so.6 module to the/usr/lib64, or you will get an error when starting the memcached service with replication function.
• Same operation on Memcached2.

Ln-s/usr/local/libevent/lib/libevent-2.1.so.6/usr/lib64/libevent-2.1.so.6

• 5, Memcached1 installs the magent, and sends the generated command to Memcached2, and on each server the command can be recognized by the system.

Tar magent-0.5.tar.gz-c/opt/
Cd/opt
VI ketama.h

#ifndef SSIZE_MAX#define SSIZE_MAX 32767  //前两行带#的改成这样#endif    //位置上调

Systemctl Stop Firewalld.service
Setenforce 0
VI Makefile

LIBS = -levent -lm -L/usr/local/libevent/lib   //注意libevent的安装路径，否则make会报错INCLUDE = -I/usr/local/libevent/include

• 6. Generate Magent Program
• It is important to note that you need to shut down the firewall before magent generates the executable program, or you cannot make it.

Make

• 7, let Magent program for system identification

CP magent/usr/local/bin/

• 8, the Magent program sent to Memcached2, so that its system identification

SCP magent [Email protected]:/usr/bin/

Two servers installed keepalived

• M1 and M2 Two server keepalive configuration files have been noted in different places.

Yum Install Keepalved-y
Vim/etc/keepalived/keepalived.conf

! Configuration File for keepalivedglobal_defs {   notification_email {     [email protected]     [email protected]     [email protected]   }   notification_email_from [email protected]   smtp_server 192.168.200.1   smtp_connect_timeout 30   router_id 001    //两台服务器不同}vrrp_script magent {                    //添加主主数据复制实例，函数名为magent，只要keepalive启动就可启动复制        script "/opt/shell/magent.sh"   //设置magent启动脚本,注意后面脚本位置要与之相同        interval 2}vrrp_instance VI_1 {    state MASTER   //从为BACKUP    interface ens33    //网卡为ens33    virtual_router_id 51   //与从服务器需要区别开    priority 100       //从服务器优先级应当比主的低    advert_int 1    authentication {        auth_type PASS        auth_pass 1111    }track_script {              //调用函数执行            magent}    virtual_ipaddress {        192.168.144.188    //设置虚拟IP    }}

Memcached1 Creating a primary master Replication monitoring script

Cd/opt/shell #没有该目录, you need to create
Vim magent.sh

#!/bin/bashK=`ps -ef | grep keepalived | grep -v grep | wc -l`if [ $K -gt 0 ]; then        magent -u root -n 51200 -l 192.168.144.188 -p 12000 -s 192.168.144.122:11211 -b 192.168.144.129:11211elsepkill -9 magentfi

-N 51200//define user maximum number of connections
-L 192.168.175.188//Specify virtual IP
-P 12000//Specify port number
-S//Specify primary cache server
-b//specify from cache server

• Increase execution permissions.

chmod +x/opt/shell/magent.sh

• Memcached1 on KeepAlive Services, and Memcache services

Memcached-d-M 32m-p 11211-u Root
Systemctl Start Keepalived.service

Memcached2 Creating a primary master Replication monitoring script

VI magent.sh #注意脚本位置要跟配置文件中对应, otherwise call execution

#!/bin/bashK=`ip addr | grep 192.168.144.188 | grep -v grep | wc -l`if [ $K -gt 0 ]; then        magent -u root -n 51200 -l 192.168.144.188 -p 12000 -s 192.168.144.122:11211 -b 192.168.144.129:11211elsepkill -9 magentfi  

• Increase execution permissions.

chmod +x/opt/shell/magent.sh

• Memcached2 on KeepAlive Services, and Memcache services

Memcached-d-M 32m-p 11211-u Root
Systemctl Start Keepalived.service

In the client test

• Accessing virtual IP and virtual ports on clients

Telnet 192.168.144.188 12000

• Writing data on the client
• Access the database on both servers, and the data is automatically replicated synchronously

Add Username 0 0 7
1234567

• Analog fault, shutdown M1 keepalive, client no-sense, virtual IP can still log on, and read and write data

Systemctl Stop Keepalived.service

memcached Implementing primary master replication and keepalive high-availability methods