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This article introduces you how to connect to the memcache server in telnet, the content is very detailed, interested friends can refer to, hope to be helpful to you.

As an excellent out-of-process cache, memcache is often used in high concurrency system architecture. Here we mainly talk about how to use the telnet tool to view the health of memcache and manage and maintain its key. Suppose the memcache installation directory: / usr/local/memcached

1. Start memcache

The copy code is as follows:

[root@localhost] # / usr/local/memcached/bin/memcached-d-m 512-u root-l 192.168.119.70-p 12000-c 512-P / usr/local/memcached/memcached.pid

Detailed explanation of startup parameters

-d: start as a daemon. If this parameter is not specified, memcache automatically shuts down when pressing the ctrl+c command ends.

-m: the maximum number of memory allocated to memcache is m, and the default is 64m

-u: specify the user running memcache

-l: specify the ip address of the listener

-p: specify the tcp port number to listen on. You can specify the udp port by-u. The default is 11211

-c: maximum number of concurrent connections

-P: the file of the error process id

After memcache starts, we can connect to memcache through telnet for simple operation and management.

2. Telnet connects to memcache

The copy code is as follows:

[root@localhost] # telnet 192.168.119.70 12000

Trying 192.168.119.70...

Connected to 192.168.119.70 (192.168.119.70).

Escape character is'^]'.

After the connection is successful, the memcache can be operated and managed. The common commands are:

Ⅰ, add and modify

Command format:\ r\ n\ r\ n

: add, set or replace

Name of the cache

A 16-bit unsigned integer that is stored with the data to be stored by key and is returned when the program get caches

: past time. 0 means never expires. If non-zero, it means unix time or seconds away.

Number of bytes to store data

\ r\ n: indicates line break and enter

Command result:

STORED: indicates success

NOT_STORED: indicates failure

A), add cache

The copy code is as follows:

Add id 1 0 4

1234

STORED

If the key already exists, a failure will be added.

B), modify the cache

The copy code is as follows:

Replace id 1 0 4

3456

STORED

When key exists, it succeeds; when it does not exist, it fails.

C), set the cache

The copy code is as follows:

Set id 1 0 4

2345

STORED

Add [add] when key does not exist, and replace [replace] if it already exists.

Ⅱ, read

Command format: get +\ r\ n

+: indicates one or more key, separated by a space when multiple key

A), read the cache of a single key

The copy code is as follows:

Get id

VALUE id 1 4

1234

END

B), read the cache of multiple key

The copy code is as follows:

Get id name

VALUE id 1 4

3456

VALUE name 1 3

Jim

END

Ⅲ, deletion

Command format: delete\ r\ n

: key to be deleted

Delete id

The copy code is as follows:

Delete id

DELETED

Ⅳ, clear all caches

Command format: flush_all

The copy code is as follows:

Flush_all

OK

Ⅴ, view cache server status

Command: stats

The copy code is as follows:

Stats

STAT pid 2711 / / process id

STAT uptime 2453 / / Total elapsed time, unit description

STAT time 1344856333 / / current time

STAT version version 1.4.0 / /

STAT pointer_size 32 / / server pointer bits, generally 32-bit operating system is 32

Cumulative user time for the STAT rusage_user 0.002999 / / process

Cumulative system events for the STAT rusage_system 1.277805 / / process

STAT curr_connections 1 / / current connections

Total number of connections after STAT total_connections 11 / / server starts

Number of STAT connection_structures 11 / / connection structur

STAT cmd_get 17 / / Total number of fetches

STAT cmd_set 1 / / Total number of writes

Total emptying times of STAT cmd_flush 1 / /

STAT get_hits 1 / / Total number of hits

STAT get_misses 7 / / get the number of missed hits

STAT delete_misses / / Delete missed number of times

STAT delete_hits 4 / / Delete hits

STAT incr_misses / / incremental operation has no hit times

STAT incr_hits / / increasing the number of operation hits

STAT decr_misses / / the number of times the decrement operation missed

STAT decr_hits / / decrease the number of hits of the operation

STAT cas_misses / / cas setting has no hit times

Number of STAT cas_hits / / cas hits

STAT cas_badval / / cas operation found key, but the version is out of date and the setting is not successful.

STAT bytes_read 455 / / Total amount of data obtained

STAT bytes_written 1175 / / Total amount of data written

STAT limit_maxbytes 1048576 / / maximum allowed memory (in bytes)

STAT accepting_conns 1

STAT listen_disabled_num 0

STAT threads 5 / / number of current threads

STAT conn_yields 0

STAT bytes 56 / / used cache space

STAT curr_items 1 / / number of keyvalue currently cached

STAT total_items 7 / / Total number of cached keyvalue, including expired deleted

STAT evictions / / number of times memory is freed by deleting keyvalue

END

Ⅵ, print version

Command: version

The copy code is as follows:

Version

VERSION 1.4.0

Ⅶ, print memory information

Command: stats slabs

The copy code is as follows:

Stats slabs

STAT 1:chunk_size 80

STAT 1:chunks_per_page 13107

STAT 1:total_pages 1

STAT 1:total_chunks 13107

STAT 1:used_chunks 1

STAT 1:free_chunks 1

STAT 1:free_chunks_end 13105

STAT 1:get_hits 10

STAT 1:cmd_set 10

STAT 1:delete_hits 4

STAT 1:incr_hits 0

STAT 1:decr_hits 0

STAT 1:cas_hits 0

STAT 1:cas_badval 0

STAT active_slabs 1

STAT total_malloced 1048560

END

3. Exit telnet

Quit

On how to connect to the memcache server in telnet to share here, I hope the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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