1.yum 安装

yum clean all
yum -y update
yum -y install memcached

2.Memcached 运行

memcached -h

//查看考号修改配置
vim /etc/sysconfig/memcached
内容如下：
PORT=”11211″
USER=”memcached”
MAXCONN=”1024″
CACHESIZE=”64″
OPTIONS=”"

可以修改端口，用户和最大内存，缓存大小
//重启，启动，开机启动，状态，关闭
systemctl restart memcached
systemctl start memcached
systemctl enable memcached
systemctl status memcached
systemctl stop memcached

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
        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 2.0.21-stable
          limit_maxbytes    67108864
     listen_disabled_num           0
                     pid       27929
            pointer_size          64
               reclaimed           0
            reserved_fds          20
           rusage_system    0.055134
             rusage_user    0.091092
                 threads           4
                    time  1429863174
       total_connections          11
             total_items           0
              touch_hits           0
            touch_misses           0
                  uptime         910
                 version      1.4.15

3.扩展一下，安装PHP-memcache扩展，防火墙放开11211端口

yum -y install php-pecl-memcache
如果是PHP56版本的应该运行
yum -y install php56w-pecl-memcache
防火墙放开11211

firewall-cmd --permanent --zone=public --add-port=11211/tcp
检查端口是否开放

echo stats | nc memcache_host_name_or_ip 11211

在centos7上安装memcached服务

memcached是一套分布式的快取系统，与redis相似,其本质上就是一个内存key-value数据库。用python读取memcached数据很方便，所以我们项目通常使用memcached．

️安装gcc

yum install gcc
yum install gcc-c++

️安装libevent

wget https://github.com/libevent/libevent/releases/download/release-2.1.11-stable/libevent-2.1.11-stable.tar.gz
tar xvf libevent-2.1.11-stable.tar.gz 
cd libevent-2.1.11-stable
./configure --prefix=/usr --libdir=/usr/lib64
make
make install

️安装memcached

wget http://www.memcached.org/files/memcached-1.6.6.tar.gz
tar xvf memcached-1.6.6.tar.gz
cd memcached-1.6.6
./configure && make && sudo make install

️启动memcached

/usr/local/bin/memcached -d -m 512 -l 0.0.0.0 -p 11211 -u root

如果需要随系统启动，需要把上面命令加入到/etc/rc.d/rc.local 文件里．如果加入后还不好用，可能是rc.local文件没有可执行权限，给执行权限就好了

chmod 755 /etc/rc.d/rc.local