Description

Type specifies the kind of storage system to use. Most everyone will want to use "ufs" as the type. If you are using Async I/O (--enable async-io) on Linux or Solaris, then you may want to try "aufs" as the type. Async IO support may be buggy, however, so beware.

Maxobjsize refers to the max object size this storedir supports. It is used to initially choose the storedir to dump the object. -1 means 'any size'.

'Directory' is a top-level directory where cache swap files will be stored. If you want to use an entire disk for caching, then this can be the mount-point directory. The directory must exist and be writable by the Squid process. Squid will NOT create any directory.

'Mbytes' is the amount of disk space (MB) to use under this directory.

'Level-1' is the number of first-level subdirectories, which will be created under the 'Directory'.

'Level-2' is the number of second-level subdirectories, which will be created under each first-level directory. To create swap directory use /usr/local/squid/bin/squid –z option.

For the diskd type, Q1 specifies the number of unacknowledged I/O requests when Squid stops opening new files. If this many messages are in the queues, Squid won't open new files. Q2 specifies the number of unacknowledged messages when Squid starts blocking. If this many messages are in the queues, Squid blocks until it receives some replies.

Example
cache_dir ufs /cache1 5000 16 256
cache_dir ufs /cache2 7000 16 256

Note
Can specify multiple cache_dir lines to spread the cache among different disk partitions. Click Here to find more informations on file systems and cache_dir.

Description
This tag is used to specify the path of the access.log file, which logs the client request activity. It contains an entry for every HTTP and ICP queries received. Log Details can be customized using log_mime_hdrs, log_fqdn, client_netmask and emulate_httpd_log.

See for Detailed information about this log file. See also log_icp_queries.

Example
cache_access_log /var/log/squid_access.log

Caution
It is safe to set log_mime_hdrs off.

Description
This tag is used to set the path of the Cache logging file. This is where general information about the cache's behaviour goes. Amount of data logged to this file can be increased with the debug_options tag below.

Example
cache_log /var/log/squid_cache.log

Caution
Do not change the default value of debug_options unless otherwise needed. Because if debug_options value is high, then logging information goes high. This leads to undesirable growth in log file.

Description
This tag is used to specify the location of the store.log, the file that logs the activities of the storage manager. The file shows which objects are ejected from the cache, and which objects are saved and for how long.

Example
cache_store_log /var/log/squid_store.log

Caution
There are no real utilities to analyze this data. So it is recommended to disable this tag

Note
To disable, enter "none" instead of the filename.

Description
This tag specifies the location for the cache "swap.log." This log file holds the metadata of objects saved on disk. It is used to rebuild the cache during startup. Normally this file resides in the first 'cache_dir' directory, but you may specify an alternate pathname here. Note, you must give a full filename, not just a directory. Since this is the index for the whole object list you CANNOT periodically rotate it.

If you have more than one 'cache_dir', these swap logs will have names such as:

• cache_swap_log.00
• cache_swap_log.01
• cache_swap_log.02

The numbered extension (which is added automatically) corresponds to the order of the 'cache_dir' lines in this configuration file.

Example
cache_ swap _log /var/log/squid_ swap.log

Caution
If you change the order of the 'cache_dir' lines in this file, then these log files will NOT correspond to the correct 'cache_dir' entry (unless you manually rename them). We recommend that you do NOT use this option. It is better to keep these log files in each 'cache_dir' directory.

Description
The Cache can emulate the log file format, which many 'httpd' programs use. To disable/enable this emulation, set emulate_httpd_log to 'off' or 'on'.

Example
emulate_httpd_log on

Caution
Before setting this to ON, make sure you have httpd_log file analyzers which will analyze log files and give us useful information.

Description
This tag is used to enable/disable logging of the destination IP address in the hierarchy log tag when the cache directs the request to the origin server.

Example
log_ip_on_direct off

Note
Earlier Squid versions logged the hostname here. If you prefer the old way, set this to off.

Description
This tag is used to set the pathname to Squid's MIME table. This file contains Squid's supported mime types.

Caution
Shouldn't need to change this, but the default file contains examples and formatting information if done.

Description
The Cache can record both the request and the response MIME headers for each HTTP transaction. The headers are encoded safely and will appear as two bracketed fields at the end of the access log (for either the native or httpd-emulated log formats). To enable this logging, set log_mime_hdrs to 'on'.

Description
If configured with the "--enable-useragent_log" configure option, Squid will write the User-Agent field from HTTP requests to the filename specified here.

Example
useragent_log /var/log/useragent.log

Description
If configured with the "--enable-referer_log" configure option, Squid will write the Referer field from HTTP requests to the filename specified here.

Example
referer_log /var/log/referer.log

Description
This tag specifies the location of the file in which Squid writes its process-ids.

Example
pid_filename /var/lock/squid.pid

Caution
To disable, enter "none".

Description
Logging options are set as section, level, where each source file is assigned a unique section. Lower levels result in less output. The magic word "ALL" sets debugging levels for all sections. We recommend normally running with "ALL, 1".

Example
debug_options ALL, 9

Caution
Full debugging (level 9) can result in a very large log file, so be careful. Normally, running with "ALL, 1" is recommended.

Description
This tag can be set to ON, if you wish to log fully qualified domain names in the access.log.

Example
log_fqdn on

Caution
To do this, Squid does a DNS lookup of all IP's connecting to it. This can (in some situations) increase latency, which makes your cache seem slower for interactive browsing.

Description
A netmask for client addresses in log files and cachemgr output. Change this to protect the privacy of your cache clients. A netmaskof 255.255.255.0 will log all IP's in that range with the last digit set to '0'.

Example
client_netmask 255.255.255.0

Caution
When you enable this tag, then the client's visit pages cannot be identified.