memcached的安装、设置及状态查看

Memcached是国外社区网站LiveJournal团队开发，目的是为了通过缓存数据库查询结果，减少数据库访问次数，从而提高动态web站点性能。

一、安装memcached

yum install -y memcached libmemcached libevent

systemctl start memcached

二、设置memcached
修改加载参数有2种，分为命令修改及配制文件修修改
(1 ) 命令修改 :/usr/bin/memcached -u xxx -p xxx -m xxx -c xxx

(2)  配制文件修改：修改memcached的配置文件，主要参数

PORT="11211"
USER="memcached"
MAXCONN="1024"
CACHESIZE="64"
OPTIONS=""

三、查看memcached运行情况
1、安装nc工具，命令：
 yum install -y nc
2、memcached运行查看命令：
echo stats |nc 127.0.0.1 11211

四、Memcached 运行结果范例：

echo stats |nc 127.0.0.1 11211

STAT pid 617

STAT uptime 2754

STAT time 1530611759

STAT version 1.4.15

STAT libevent 2.0.21-stable

STAT pointer_size 64

STAT rusage_user 0.037363

STAT rusage_system 0.041996

STAT curr_connections 10

STAT total_connections 12

STAT connection_structures 11

STAT reserved_fds 20

STAT cmd_get 0

STAT cmd_set 0

STAT cmd_flush 0

STAT cmd_touch 0

STAT get_hits 0

STAT get_misses 0

STAT delete_misses 0

STAT delete_hits 0

STAT incr_misses 0

STAT incr_hits 0

STAT decr_misses 0

STAT decr_hits 0

STAT cas_misses 0

STAT cas_hits 0

STAT cas_badval 0

STAT touch_hits 0

STAT touch_misses 0

STAT auth_cmds 0

STAT auth_errors 0

STAT bytes_read 13

STAT bytes_written 1024

STAT limit_maxbytes 67108864

STAT accepting_conns 1

STAT listen_disabled_num 0

STAT threads 4

STAT conn_yields 0

STAT hash_power_level 16

STAT hash_bytes 524288

STAT hash_is_expanding 0

STAT bytes 0

STAT curr_items 0

STAT total_items 0

STAT expired_unfetched 0

STAT evicted_unfetched 0

STAT evictions 0

STAT reclaimed 0

END

注：memcached-tool是查看memcached状态的一款工具

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