memcached群集

本实验实现的是memcached+magent+keepalived高可用群集：

• magent：代理memcached实现负载均衡
• keepalived：magent主从HA高可用
• memcached：缓存对象

实验要求：

• 主服务器：192.168.177.140（magent+memcached+libevent+keepalived)
• 从服务器：192.168.177.135（memcached+libevent+keepalived)
• 客户机：192.168.177.132(telnet软件包)

挂载（主从）

# tar zxvf libevent-2.1.8-stable.tar.gz -C /opt# tar zxvf memcached-1.5.6.tar.gz -C /opt# mkdir /opt/magent ==注==从服务器不做# tar zxvf magent-0.5.tar.gz -C /opt/magent/# yum install gcc gcc-c++ make -y---# cd /opt/libevent-2.1.8-stable/  ./configure --prefix=/usr      # make && make install# cd memcached-1.5.6/ ./configure --with-libevent=/usr    # make && make instal--- 只有主：# cd /opt/magent/# vim ketama.h ifndef SSIZE_MAX                 define SSIZE_MAX 32767# vim Makefile LIBS = -levent -lm make

安装openssh-clients

主服务器上：# yum install openssh-clients -y# cp magent /usr/bin/  //便于使用# scp magent root@192.168.177.135:/usr/bin   //将magent复制到从服务器上# systemctl stop firewalld.service  //关闭防火墙# setenforce 0  //增强型安全功能从服务器上：# yum install openssh-clients# systemctl stop firewalld.service# setenforce 0# cd /usr/bin# ls就会发现magent变成一个可执行的文件

安装keepalived

主服务器上：# yum install keepalived -y# vi /etc/keepalived/keepalived.conf  router_id MAGENT_HA interface ens33 virtual_router_id 51 priority 100 virtual_ipaddress {        192.168.177.188  //设置的虚拟IP    }vrrp_script magent {        script "/opt/shell/magent.sh"        interval 2}track_script {        magent}# scp /etc/keepalived/keepalived.conf root@192.168.177.135:/etc/keepalived/keepalived.conf   //将keepalived.conf复制到从服务器上从服务器上：# vim /etc/keepalived/keepalived.conf 修改：state ：BACKUP       interface ens33       virtual_router_id 52       priority 90

编辑脚本文件

主从一样：# mkdir /opt/shell# cd /opt/shell# vi magent.sh#!/bin/bashK=`ps -ef | grep keepalived | grep -v grep | wc -l`if [ $K -gt 0 ]; then        magent -u root -n 51200 -l 192.168.177.188 -p 12000 -s 192.168.177.140:11211 -b 192.168.177.135:11211elsepkill -9 magentfi# chmod +x magent.sh  //为脚本添加执行权限# systemctl start keepalived.service //开启服务

启动memcached服务

# memcached -m 512k -u root -d -l 192.168.177.140 -p 11211 //主服务器上# memcached -m 512k -u root -d -l 192.168.177.135 -p 11211   //从服务器上ip addr //查看虚拟地址

在客户机上安装telnet

# yum install telnet -y