Memcached是一个基于key=>value的分布式对象缓存系统,虽说现在redis的功能相对强大,但是某些场景Memcached还是占有优势,如数据库缓存。

×以下安装均在CentOS 5/6 64位操作系统上完成×

目录:

  1. Libevent的安装

  2. Memcached的安装与配置

  3. Zabbix监控Memcached

  4. Web管理Memcached


1.Libevent安装

wget 
tar zxf release-1.4.15-stable.tar.gz
cd libevent-release-1.4.15-stable/

一般来说直接运行./configure就可以的,而且里面的文档也是这样说的

[root@Nginx libevent-release-1.4.15-stable]# ./configure
-bash: ./configure: No such file or directory

会发现提示错误,其实这个时候还没有生成configure文件,需要执行以下目录下的./autogen.sh

[root@Nginx libevent-release-1.4.15-stable]# ./autogen.sh
./autogen.sh: line 11: aclocal: command not found

又提示找不到aclocal,这是因为没有安装autoconf automake libtool

yum -y install autoconf automake libtool
./autogen.sh
./configure --prefix=/usr/local/libevent1.4.15
make && make install

注意:libevent安装的时候需要先生成configure文件,这里应该会走不少弯路


2.Memcached的安装

wget 
tar zxf memcached-1.4.25.tar.gz
cd memcached-1.4.25
./configure --prefix=/usr/local/memcached1.4.25 --with-libevent=/usr/local/libevent1.4.15
#注意这里需要指定libevent的安装地址
make && make install

memcached命令行监控工具:

将附件中的memcached-tool上传到/usr/local/memcached1.4.25/bin目录下

将附件中的memcached文件上传到/etc/init.d/目录下

chmod +x /etc/init.d/memcached
chmod +x /usr/local/memcached1.4.25/bin/memcached-tool
mkdir -p /var/run/memcached
ln -s /usr/local/memcached1.4.25/bin/* /usr/bin/

如果需要自定义memcached的启动参数,可以直接修改/etc/init.d/memcached文件

PORT=11211
USER=nobody
MAXCONN=10240
CACHESIZE=3096
OPTIONS=""


Memcache的状态查看

[root@Nginx ~]# memcached-tool 127.0.0.1:11211 stats
#127.0.0.1:11211   Field       Value
         accepting_conns           1
               auth_cmds           0
             auth_errors           0
                   bytes           0
              bytes_read           7
           bytes_written           0
              cas_badval           0
                cas_hits           0
              cas_misses           0
               cmd_flush           0
                 cmd_get           0
                 cmd_set           0
               cmd_touch           0
             conn_yields           0
   connection_structures          11
   crawler_items_checked           0
       crawler_reclaimed           0
        curr_connections          10
              curr_items           0
               decr_hits           0
             decr_misses           0
             delete_hits           0
           delete_misses           0
       evicted_unfetched           0
               evictions           0
       expired_unfetched           0
                get_hits           0
              get_misses           0
              hash_bytes      524288
       hash_is_expanding           0
        hash_power_level          16
               incr_hits           0
             incr_misses           0
                libevent      1.4.15
          limit_maxbytes  3246391296
     listen_disabled_num           0
       lrutail_reflocked           0
            malloc_fails           0
                     pid       13376
            pointer_size          64
               reclaimed           0
            reserved_fds          20
           rusage_system    0.000999
             rusage_user    0.000000
                 threads           4
                    time  1452663956
time_in_listen_disabled_us           0
       total_connections          11
             total_items           0
              touch_hits           0
            touch_misses           0
                  uptime          13
                 version      1.4.25

以上是memcached的状态项目


3.Zabbix监控脚本:

在zabbix_agentd.conf文件末尾添加

UserParameter=memcached.stats[*],/usr/bin/memcached-tool 127.0.0.1:11211 stats|awk '/$1/{print $$2}'|head -1

然后重启zabbix_agentd服务

然后导入zabbix memcached模板

Memcached安装、配置及监控_第1张图片


4.利用memadmin监控管理memcached

这个需要在一台安装了php环境带有memcache模块下运行


下载地址:http://down.51cto.com/data/2149158


Memcached安装、配置及监控_第2张图片


总体来说memcached的安装还是比较简单的,而且还带有简单的状态接口,便于我们对其进行监控。