- Published on
Flush Memcached Using Bash
- Authors
- Name
- Kevin van Zonneveld
- @kvz
If you store application data in memcache, you may want to invalidate it once you deploy a new version to avoid corruption or weird results. There are several ways to do this but I recently tried one using nothing but Bash, and I like it.
Flush Memcache in Bash
Just add this to your deploy script:
$ echo "flush_all" | /bin/netcat -q 2 127.0.0.1 11211
(remember, all entries will be flushed. this is not the way to fly in high performance environments)
Bonus: Flush Disk Cache
Also, if you have cache files on disk, this is probably one of the best ways to trash them:
$ find YOUR/WEB/DIR/app/tmp/cache/ -type f -print0 | xargs -0 rm
It's actually a simplified version from what PHP uses to clean up session
garbage files (see /etc/cron.d/php5)
What's good about this elaborate approach, is that it deals with
- "argument list too long" by using find instead of a
rm * - non-unix characters
print0 will delimit files by the 0 character, so you won't have to escape
spaces or any other 'crazy' chars
Legacy Comments (7)
These comments were imported from the previous blog system (Disqus).
Nice and to the point article...
a little off topic maybe: why not use the -delete option in find to delete all the found files instead of piping it to xargs etc? Does that have a special reason to it?
@ Robin Speekenbrink: thx. No not really. Guess I\'m just really used to xargs as it gives you the power to do anything with files found. But -delete should work just fine!
Thanks for sharing how to flush memcache in bash.. good article!
Good tip. I added this to the end of my Hg hook to refresh things when I push out an update. Thanks!
What does the "-q 2" part mean?
Janis, it's a netcat option. From the man page:
-q seconds after EOF on stdin, wait the specified number of seconds and then quit. If seconds is negative, wait forever.
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