Memcached集群

Memcached集群

配置memcached主缓存节点和从缓存节点-----两台配置相同 开启三台虚拟机： 192.168.80.100 配置memcached主缓存节点 192.168.80.101 配置memcached从缓存节点 192.168.80.102

1.关闭防火墙机及Selinux[重要]（三台开始都要启动） systemctl stop firewalld //关闭防火墙 setenforce 0 //关闭监控

2.安装环境包 yum install gcc gcc-c++ make -y

3.编译安装libevent（必须先安装） 安装上传软件 yum install lrz* -y

#解压 tar xf libevent-2.1.8-stable.tar.gz -C /opt tar xf memcached-1.5.6.tar.gz -C /opt/ #切换到libevent目录 cd /opt/libevent-2.1.8-stable/

#配置 ./configure --prefix=/usr/local/libevent

#编译及安装 make && make install

3.编译安装memcached #切换到memcached cd /opt/memcached-1.5.6/

#配置（指定libevent路径） ./configure \ --prefix=/usr/local/memcached \ --with-libevent=/usr/local/libevent/

#编译及安装 make && make install

4.优化启动（支持复制功能的Mencached需要安装后的libevent-2.1.so.6模块，不然启动服务会报错） ln -s /usr/local/libevent/lib/libevent-2.1.so.6.0.2 /usr/lib64/libevent-2.1.so.6

5.分别在两台服务器上启动memcached #主服务器 cd /usr/local/memcached/bin/ ./memcached -d -m 32m -l 192.168.80.100 -p 11211 -u root #从服务器 cd /usr/local/memcached/bin/ ./memcached -d -m 32m -l 192.168.80.101 -p 11211 -u root 6.检查memcached是否启动 netstat -anpt | grep memcached netstat -ntap | grep 11211

magent在主服务器安装，从服务器不用安装 编译安装magent 1.创建magent目录 mkdir /opt/magent 2.解压 tar xf magent-0.5.tar.gz -C /opt/magent 3.切换到目录 cd /opt/magent 4.让动态链接库为系统所共享 /sbin/ldconfig

5.编辑ketama.h，添加文件头部信息 vi ketama.h #ifndef SSIZE_MAX #define SSIZE_MAX 32767

6.修改Makefile vi Makefile //libevent安装路径在/usr/local/libevent中使用以下内容： LIBS = -levent -lm -L /usr/local/libevent/lib INCLUDE=-I /usr/local/libevent/include

Magent + Keepalived实现Memcached高可用群集 7.编译（完成后会生成一个manage的可执行文件） make

8.复制mgent命令到系统管理中，便于使用 cp /opt/magent/magent /usr/bin/ 9.发送至从服务器 scp /opt/magent/magent root@192.168.80.101:/usr/bin

安装keepalived yum -y install keepalived

1.编辑keepalived配置文件 vi /etc/keepalived/keepalived.conf 把里面内容删除添加以下内容 ! Configuration File for keepalived global_defs { router_id magent_H1 #指定router_id } vrrp_script magent { #定义函数 script "/root/shell/magent.sh" interval 2 } vrrp_instance VI_1 { state MASTER interface ens32 #本地网卡名称 virtual_router_id 51 #id主从一致 priority 100 #主优先级大于从优先级 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { #调用函数 magent } virtual_ipaddress { #vip地址 192.168.80.188 } }

2.建立shell目录 mkdir /root/shell 3.创建magent.sh脚本 vi /root/shell/magent.sh #!/bin/bash Keepalived=`ps -ef | grep keepalived | grep -v grep | wc -l` if [ $Keepalived -gt 0 ]; then magent -u root -n 51200 -l 192.168.80.188 -p 12000 -s 192.168.80.100:11211 -b 192.168.80.101:11211 else pkill -9 magent fi

参数说明： -n 51200 #定义用户最大连接数 -l 192.168.175.188 #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

4.赋予脚本执行权限 chmod +x /root/shell/magent.sh 5.启动keepalived服务 systemctl enable keepalived systemctl start keepalived netstat -anpt | grep 12000

6.检查keepalived服务状态 systemctl status keepalived

7.检查vip地址 ip addr show ens32

netstat -anpt | grep 11211

在从服务器上操作 1.安装keepalived yum -y install keepalived

2.将主服务器上keepalived配置文件复制过来 scp root@192.168.80.100:/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf

3.编辑keepalived配置文件 vi /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { router_id magent_H2 #指定router_id } vrrp_script magent { #定义函数 script "/root/shell/magent.sh" interval 2 } vrrp_instance VI_1 { state BACKUP interface ens33 #本地网卡名称 virtual_router_id 51 #id主从一致 priority 90 #主优先级大于从优先级 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { #vip地址 192.168.80.188 } track_script { #调用函数 magent } }

4.新建shell目录 mkdir /root/shell 5.创建magent.sh脚本 vi /root/shell/magent.sh #!/bin/bash Keepalived=`ip addr | grep 192.168.80.188 | grep -v grep | wc -l` if [ $Keepalived -gt 0 ]; then magent -u root -n 51200 -l 192.168.80.188 -p 12000 -s 192.168.80.100:11211 -b 192.168.80.101:11211 else pkill -9 magent fi

6.赋予脚本执行权限 chmod +x /root/shell/magent.sh 7.启动keepalived服务 systemctl enable keepalived systemctl start keepalived

8.检查keepalived服务状态 systemctl status keepalived

9.检查vip地址 ip addr show ens32

在客户端测试 1.安装telnet客户端 yum install telnet -y

2.连接memcached 测试复制功能 //连接vip进行测试，插入user键值 telnet 192.168.80.188 12000 Trying 192.168.80.188... Connected to 192.168.80.188. Escape character is '^]'. set user 0(标签) 0(缓存时间永不过期) 5(缓存内容) 12345 STORED get user VALUE user 0 5 12345 END quit Connection closed by foreign host. //连接Memcached1，查询user键值，可以获取，成功！ telnet 192.168.80.100 11211 Trying 192.168.80.100... Connected to 192.168.80.100. Escape character is '^]'. get user VALUE user 0 5 12345 END quit Connection closed by foreign host.

//连接Memcached2，查询user键值，也可以获取，成功！ [root@centos7-1 ~]# telnet 192.168.80.101 11211 Trying 192.168.80.101... Connected to 192.168.80.101. Escape character is '^]'. get user VALUE user 0 5 12345 END quit Connection closed by foreign host.

测试单点故障 停止主服务器，去连接漂移地址，查看有木有出现内容

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