Tutorial details | |
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Difficulty | Easy (rss) |
Root privileges | No |
Requirements | None |
Time | 1m |
- nc command – The nc (also know as netcat) utility is used for just about anything under the sun involving TCP or UDP.
- telnet command – The telnet command is used to communicate with another host using the TELNET protocol.
netcat (nc) Command Example To Flush Contents Of Memcached Server
The nc (netcat) command is a simple unix utility which reads and writes data across network connections, using TCP or UDP protocol. It can simply connect to the memcached instance and and invalidate all existing cache:
echo 'flush_all' | nc localhost 11211
On some system it may be called netcat, so try it as follows to remove all data of a memcached server running on Linux:
echo 'flush_all' | netcat localhost 11211
Try nc:
nc 192.168.1.10 11211
Where,
- 192.168.1.10 - memcached server instance
- localhost - memcached server instance
- 11211 - memcached server port.
You can create a bash shell alias as follows in your ~/.bashrc file:
## bash shortcut ## alias flush_mem_cache_server="echo 'flush_all' | netcat 127.0.0.1 11211"
And use it as follows:
$ flush_mem_cache_server
Telnet Command Example To Flush Contents Of Memcached Server
Type the following command:
telnet your-memcached-server-ip PORT
In this example connect to 192.168.1.10 11211 and issue the flush_all command as follows:
$ telnet 192.168.1.10 11211
Sample outputs:
Trying 192.168.1.10... Connected to cache01.nixcraft.net.in. Escape character is '^]'. flush_all OK quit Connection to cache01.nixcraft.net.in closed by foreign host.
Use bash only to flush all the content from Memcached
The syntax is:
echo flush_all > /dev/tcp/127.0.0.1/11211
Conclusion
This page explained how to flush contents of a memcached server running on a Linux or Unix-like systems using telnet or nc commands. For more information, see this page here.
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Thanks.
thanks
$ telnet 192.168.1.10 11212 <- wrong port,
should be: $ telnet 192.168.1.10 11211
The faq has been updated. I appreciate your post.
Apart from memcached server, I had css/js on-fly minified cache stored on /var/www/.diskcache. To flush disk cache at /var/www/.diskcache:
With bash only:
echo flush_all >/dev/tcp/127.0.0.1/11211
Thanks
That’s one heck of an escape sequence! :p
Thanks for the heads up. I fixed page rendering.
Some of your examples show “flush all” and not “flush_all” – the latter of the two seems to be the correct command. If possible can you update the post examples with flush_all :)