Brief analysis of Memcache launch and Telnet command detailed

1, start memcache commonly used parameters

Copy Code code as follows:


-P <num> listening TCP ports (default: 11211)


-u <num> UDP listening ports (default: 11211, 0 o'clock off)


-D runs in daemon mode


-u <username> run memcached account not root


-M <num> the largest memory usage unit is MB default is 64MB


-C <num> Soft Connection number default is 1024


-V Output warning and error message


-VV Print Client request and return information


-H Printing Help information


-I printing memcached and libevent copyright information


-L <ip_addr> binding address (default: all allow, regardless of intranet or local replacement IP, there are security risks, if set to 127.0.0.1 can only be local access)


-P <file> writes the PID to the file <file&gt, which allows for quick process termination behind, which needs to be used with-D

2, Memcache telnet common 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 order detailed

Pid	Memcache The process ID of the server
Uptime	Number of seconds the server has been running
Time	Server's current UNIX timestamp
Version	Memcache version
Pointer_size	The current operating system pointer size (32-bit system is typically 32bit)
Rusage_user	Cumulative user time for the process
Rusage_system	Cumulative system time of the process
Curr_items	The number of items currently stored by the server
Total_items	Total number of items stored since server startup
bytes	The number of bytes consumed by the current server storage items
Curr_connections	The number of connections currently open
Total_connections	Number of connections that have been opened since the server was started
Connection_structures	Number of connection constructs that the server assigns
Cmd_get	Get command (gets) the total number of requests
Cmd_set	Set command (save) number of total requests
Get_hits	Total Hit Count
Get_misses	Total missed Hits
Evictions	Number of items deleted to get free memory (the space allocated to memcache needs to be removed from the old items to get space allocated to new items)
Bytes_read	Total Read bytes (number of bytes requested)
Bytes_written	Total Bytes sent (result bytes)
Limit_maxbytes	Size of memory allocated to Memcache (bytes)
Threads	Current number of threads

4, Memcache start tips
A: Monitor intranet addresses
B: Modify the default port number
C: Set maximum number of connections, maximum memory footprint