5.3 Initializing Cache Directories

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Before running Squid for the first time, and whenever you add a new cache_dir , you must initialize the cache directories. The command is simply:

 % squid -z 

For the UFS- related storage schemes ( ufs , aufs , and diskd ; see Chapter 8), this command creates the subdirectories needed under each cache_dir . You don't need to worry that Squid will wipe out your current cache directories (if any).

Ownership and permissions are a common problem at this stage. Squid runs under a certain user ID, specified with cache_effective_user in squid.conf . This user ID must have read and write permission under each cache_dir directory. If not, you'll see a message like this:

 Creating Swap Directories FATAL: Failed to make swap directory /usr/local/squid/var/cache/00:     (13) Permission denied 

In this case, you should make sure that all components of /usr/local/squid/var/cache are accessible to the user ID given in squid.conf . The final component ”the cache directory ”must be writable by this user ID as well.

Cache directory initialization may take a couple of minutes, depending on the size and number of cache directories, and the speed of your disk drives . If you want to watch the progress, use the -X option:

 % squid -zX 
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Squid
Squid: The Definitive Guide
ISBN: 0596001622
EAN: 2147483647
Year: 2004
Pages: 401
Authors: Duane Wessels

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