###memcache安装 CentOS7安装Memcached 三步曲 ```` 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 ```` ###多实例端口配置 yum安装memcache配置在/etc/sysconfig复制一份memcached修改里面的端口号如： ```` PORT="10002" USER="memcached" MAXCONN="1024" CACHESIZE="2048" OPTIONS="" ```` 在/usr/lib/systemd/system添加启动服务具体参照memcached.service 复制一份 如：memcached10002.service ```` [Unit] Description=Memcached Before=httpd.service After=network.target [Service] Type=simple EnvironmentFile=-/etc/sysconfig/memcached10002 ExecStart=/usr/bin/memcached -u $USER -p $PORT -m $CACHESIZE -c $MAXCONN $OPTIONS [Install] WantedBy=multi-user.target ```` ###启动服务 systemctl start memcached10002 systemctl enable memcached10002 ```` /etc/systemd/system /usr/lib/systemd/system/ /etc/sysconfig/ ````