命令行访问memcached

有很多的web端和GUI可以访问到Memcached服务，比如phpMemCacheAdmin，但是有些时候需要在命令行进行Memcached的访问。在本教程中使用Telnet来攻取Memcached信息，以及如何读取与删除数据。连接

telnet localhost 11211

获取服务信息，如pid, uptime, version, 条目数, 连接数

stats

获取slab信息，那么什么是slab Memory is allocated in chunks internally and constantly reused. Since memory is broken into different size slabs, you do waste memory if your items do not fit perfectly into the slab the server chooses to put it in. Memcached会根据你数据的大小来存放不同的slab，可以理解为片或分区，这样不会浪费内存。

stats slabs

获取条目信息

stats items

访问和删除数据

知道slab的概念和信息之后，可以使用如下命令访问slab

stats cachedump [slab ID] [number of items, 0 for all items]

如在ID=36的slab中有3个条目

stats cachedump 36 0
ITEM model1 [223301 b; 1383751902 s]
ITEM modelNodeid1 [223301 b; 1383751902 s]
ITEM id1 [223300 b; 1383751902 s]
END

获取id1

get id1

删除id1

delete id1

退出

quit 或 ctrl + ]

Command Description Example

get	Reads a value	get mykey
set	Set a key unconditionally	set mykey 0 60 5
add	Add a new key	add newkey 0 60 5
replace	Overwrite existing key	replace key 0 60 5
append	Append data to existing key	append key 0 60 15
prepend	Prepend data to existing key	prepend key 0 60 15
incr	Increments numerical key value by given number	incr mykey 2
decr	Decrements numerical key value by given number	decr mykey 5
delete	Deletes an existing key	delete mykey
flush_all	Invalidate specific items immediately	flush_all
Invalidate all items in n seconds	flush_all 900
stats	Prints general statistics	stats
Prints memory statistics	stats slabs
Prints memory statistics	stats malloc
Print higher level allocation statistics	stats items
	stats detail
	stats sizes
Resets statistics	stats reset
version	Prints server version.	version
verbosity	Increases log level	verbosity
quit	Terminate telnet session	quit

参考： http://www.alphadevx.com/a/90-Accessing-Memcached-from-the-command-line

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