Clear Squid Proxy Cache And Re-create the Cache Directories

by on August 25, 2013 · 3 comments· LAST UPDATED November 15, 2013

in , ,

How do I clear squid cache? How do I re-create the cache directories on a server where Squid version 3.x is currently running in Linux or Unix based server?

You can delete/clear cache and re-create the cache directories on a server using the following procedure. Please note that you need to run additional commands if you are using SELinux.

Tutorial details
DifficultyEasy (rss)
Root privilegesYes
RequirementsNone
Estimated completion time5m

Step #1: Find Squid cache dir location

Open a terminal and then type:
# grep cache_dir /etc/squid/squid.conf
Sample outputs:

cache_dir ufs /var/spool/squid 100 16 256

Step #2: Restart Squid with an empty cache

Open a terminal and login as root user. Or use the ssh command to login to the remote server. Once logged in type the following command to shutdown squid proxy server:
# squid -k shutdown

Use the following rm command to delete the directory:
# rm -rf /path/to/dir/cache/
# rm -rf /var/spool/squid/

Please note that you need repeat the rm command for each cache_dir location you wish to empty. Next, use the following mkdir command to create directory and set permission using chown command:
# mkdir /var/spool/squid
# chown squid:squid /var/spool/squid

A note about SELinux user

If you are using SELinux, type the following command to restestore file(s) default SELinux security contexts:
# restorecon -vr /var/spool/squid

Creating cache_dir

Finally, to re-create the cache directories, enter:
# squid -z
Sample outputs:

2013/08/24 04:24:19| Making directories in /var/spool/squid/00
2013/08/24 04:24:19| Making directories in /var/spool/squid/01
2013/08/24 04:24:19| Making directories in /var/spool/squid/02
2013/08/24 04:24:20| Making directories in /var/spool/squid/03
2013/08/24 04:24:20| Making directories in /var/spool/squid/04
2013/08/24 04:24:20| Making directories in /var/spool/squid/05
2013/08/24 04:24:20| Making directories in /var/spool/squid/06
2013/08/24 04:24:20| Making directories in /var/spool/squid/07
2013/08/24 04:24:20| Making directories in /var/spool/squid/08
2013/08/24 04:24:20| Making directories in /var/spool/squid/09
2013/08/24 04:24:20| Making directories in /var/spool/squid/0A
2013/08/24 04:24:20| Making directories in /var/spool/squid/0B
2013/08/24 04:24:20| Making directories in /var/spool/squid/0C
2013/08/24 04:24:20| Making directories in /var/spool/squid/0D
2013/08/24 04:24:20| Making directories in /var/spool/squid/0E
2013/08/24 04:24:20| Making directories in /var/spool/squid/0F

Starting squid proxy server

To start squid type:
# squid
OR
# service squid start
Sample outputs:

Starting squid:                                            [  OK  ]

Step #3: Verify Squid is running

Type the following commands:
# netstat -tulpn | grep :3128
# tail -f /var/log/squid/access.log
# tail -f /var/log/squid/cache.log

TwitterFacebookGoogle+PDF versionFound an error/typo on this page? Help us!

{ 3 comments… read them below or add one }

1 David Stark November 15, 2013 at 6:08 pm

.. thanks but this is the kinda useless bit of recycled and generic documentation which gets novice admins into trouble.

Be weary of doing this on a server hardned with selinux.
Squid will not be able to access the freshly created cache.

EG (centos 6.x) :
[root@server /var/spool]# ls -laZ squid.orig/0F/FF/
drwxr-x—. squid squid unconfined_u:object_r:squid_cache_t:s0 .
drwxr-x—. squid squid unconfined_u:object_r:squid_cache_t:s0 ..
[root@server /var/spool]# ls -laZ squid/0F/FF/
drwxr-x—. squid squid unconfined_u:object_r:var_spool_t:s0 .
drwxr-x—. squid squid unconfined_u:object_r:var_spool_t:s0 ..

Reply

2 nixCraft November 15, 2013 at 7:36 pm

You can simply run restorecon command. The faq has been updated to include a note about SELinux user. Hope this helps and I appreciate your post.

Reply

3 Tiao January 8, 2014 at 9:48 am

Novice sysadmins set SELinux to disabled, so, there is no problem at all ;)
lol

Reply

Leave a Comment

Tagged as: , , , , , , ,

Previous Faq:

Next Faq: