Introduction to memcache startup and telnet commands

This article provides a detailed analysis of memcache startup and telnet commands. For more information, see

1. start common Memcache parameters
The code is as follows:
-P TCP port of The Listener (default: 11211)
-U UDP listening port (default: 11211, disabled at 0)
-D run as a daemon
-U The account running Memcached is not a root user.
-M The maximum memory usage unit is MB. the default value is 64 MB.
-C The default number of soft connections is 1024.
-V output warning and error message
-Vv: print the client's request and return information
-H: Print Help information
-I print the copyright information of memcached and libevent.
-L Binding address (default: all allow, regardless of the intranet and internet or the local machine to change the IP address, there is a security risk, if set to 127.0.0.1, only local access is allowed)
-P Write PID to file In this way, the following process can be terminated quickly and must be used together with-d.

2. Memcache telnet commands

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

3. stats command details

Pid	Memcache server process ID
Uptime	Number of seconds that the server has run
Time	Current unix timestamp of the server
Version	Memcache version
Pointer_size	Pointer size of the current operating system (32-bit system is generally 32bit)
Rusage_user	Cumulative user time of the process
Rusage_system	Cumulative system time of processes
Curr_items	Number of items currently stored on the server
Total_items	Total number of items stored after Server startup
Bytes	Number of bytes occupied by items stored on the current server
Curr_connections	Number of currently opened connections
Total_connections	Number of connections that have been opened since the server is started
Connection_structures	Number of connections allocated by the server
Pai_get	Total get Command (get) requests
Performance_set	Total number of set command (save) requests
Get_hits	Total hits
Get_misses	Total number of missed hits
Evictions	Number of items deleted to get idle memory (the old items need to be deleted after the space allocated to memcache is full to get the space allocated to the new items)
Bytes_read	Total number of read bytes (number of request bytes)
Bytes_written	Total number of sent bytes (number of returned bytes)
Limit_maxbytes	Memory size (bytes) allocated to memcache)
Threads	Current thread count

4. start tips for Memcache
A: listener intranet address
B: modify the default port number.
C: set the maximum number of connections and the maximum memory usage.