Ubuntu Manpage: log_db_daemon - Database logging daemon for Squid

Provided by: squid-openssl_6.6-1ubuntu5.1_amd64

NAME

       log_db_daemon - Database logging daemon for Squid

       Version 0.5.

SYNOPSIS

       log_db_daemon DSN [options]

DESCRIPTION

       This program writes Squid access.log entries to a database.  Presently only accepts the
       squid native log format.

       The script has been developed and tested in the following environment:

       squid-2.7 Squid-3.2
       mysql 5.0.26 and 5.1
       perl 5.8.8
       OpenSUSE 10.2

OPTIONS

       DSN         Database DSN encoded as a path. This is sent as the access_log file path.

                   Sample configuration:
                     access_log daemon:/host/database/table/username/password squid

                     to leave a parameter unspecified use a double slash:
                     access_log daemon://database/table/username/password squid

                   Default "DBI:mysql:database=squid"

       --debug     Write debug info to stderr.

CONFIGURATION

Squid configuration
access_log directive

The path to the access log file is used to provide the database connection parameters.

access_log daemon:/mysql_host:port/database/table/username/password squid

The 'daemon' prefix is mandatory and tells squid that the logfile_daemon helper is to be
used instead of the normal file logging.

The last parameter tells squid which log format to use when writing lines to the log
daemon. Presently squid format is supported.

mysql_host:port
Host where the mysql server is running. If left empty, 'localhost' is assumed.

database
Name of the database to connect to. If left empty, 'squid_log' is assumed.

table
Name of the database table where log lines are stored. If left empty, 'access_log' is
assumed.

username
Username to use when connecting to the database. If left empty, 'squid' is assumed.

password
Password to use when connecting to the database. If left empty, no password is used.

To leave all fields to their default values, you can use a single slash:

access_log daemon:/ squid

To specify only the database password, which by default is empty, you must leave
unspecified all the other parameters by using null strings:

access_log daemon://///password squid

logfile_daemon directive

This is the current way of telling squid where the logfile daemon resides.

logfile_daemon /path/to/squid/libexec/logfile-daemon_mysql.pl

The script must be copied to the location specified in the directive.

Database configuration
Let's call the database 'squid_log' and the log table 'access_log'. The username and
password for the db connection will be both 'squid'.

Database

Create the database:

CREATE DATABASE squid_log;

User

Create the user:

GRANT INSERT,SELECT,CREATE ON squid_log.* TO 'squid'@'localhost' IDENTIFIED BY 'squid';
FLUSH PRIVILEGES;

Note that only CREATE, INSERT and SELECT privileges are granted to the 'squid' user. This
ensures that the logfile daemon script cannot change or modify the log entries.

Table

The Daemon will attempt to initialize this table if none exists when it starts.

The table created should look like:

CREATE TABLE access_log (
id INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY,
time_since_epoch DECIMAL(15,3),
time_response INTEGER,
ip_client CHAR(15),
ip_server CHAR(15),
http_status_code VARCHAR(10),
http_reply_size INTEGER,
http_method VARCHAR(20),
http_url TEXT,
http_username VARCHAR(20),
http_mime_type VARCHAR(50),
squid_hier_status VARCHAR(20),
squid_request_status VARCHAR(20)
);

DATA EXTRACTION

   Sample queries.
       Clients accessing the cache
             SELECT DISTINCT ip_client FROM access_log;

       Number of request per day
             SELECT
               DATE(FROM_UNIXTIME(time_since_epoch)) AS date_day,
               COUNT(*) AS num_of_requests
             FROM access_log
             GROUP BY 1
             ORDER BY 1;

       Request status count
           To obtain the raw count of each request status:

             SELECT squid_request_status, COUNT(*) AS n
             FROM access_log
             GROUP BY squid_request_status
             ORDER BY 2 DESC;

           To calculate the percentage of each request status:

             SELECT
               squid_request_status,
               (COUNT(*)/(SELECT COUNT(*) FROM access_log)*100) AS percentage
             FROM access_log
             GROUP BY squid_request_status
             ORDER BY 2 DESC;

           To distinguish only between HITs and MISSes:

             SELECT
               'hits',
               (SELECT COUNT(*)
               FROM access_log
               WHERE squid_request_status LIKE '%HIT%')
               /
               (SELECT COUNT(*) FROM access_log)*100
               AS percentage
             UNION
             SELECT
               'misses',
               (SELECT COUNT(*)
               FROM access_log
               WHERE squid_request_status LIKE '%MISS%')
               /
               (SELECT COUNT(*) FROM access_log)*100
               AS percentage;

       Response time ranges
             SELECT
               '0..500',
               COUNT(*)/(SELECT COUNT(*) FROM access_log)*100 AS percentage
             FROM access_log
             WHERE time_response >= 0 AND time_response < 500
             UNION
             SELECT
               '500..1000',
               COUNT(*)/(SELECT COUNT(*) FROM access_log)*100 AS percentage
             FROM access_log
             WHERE time_response >= 500 AND time_response < 1000
             UNION
             SELECT
               '1000..2000',
               COUNT(*)/(SELECT COUNT(*) FROM access_log)*100 AS percentage
             FROM access_log
             WHERE time_response >= 1000 AND time_response < 2000
             UNION
             SELECT
               '>= 2000',
               COUNT(*)/(SELECT COUNT(*) FROM access_log)*100 AS percentage
             FROM access_log
             WHERE time_response >= 2000;

       Traffic by mime type
             SELECT
               http_mime_type,
               SUM(http_reply_size) as total_bytes
             FROM access_log
             GROUP BY http_mime_type
             ORDER BY 2 DESC;

       Traffic by client
             SELECT
               ip_client,
               SUM(http_reply_size) AS total_bytes
             FROM access_log
             GROUP BY 1
             ORDER BY 2 DESC;

KNOWN ISSUES

   Speed issues
       The MyISAM storage engine is known to be faster than the InnoDB one, so although it
       doesn't support transactions and referential integrity, it might be more appropriate in
       this scenario. You might want to append "ENGINE=MYISAM" at the end of the table creation
       code in the above SQL script.

       Indexes should be created according to the queries that are more frequently run. The DDL
       script only creates an implicit index for the primary key column.

   Table cleanup
       This script currently implements only the "L" (i.e. "append a line to the log") command,
       therefore the log lines are never purged from the table. This approach has an obvious
       scalability problem.

       One solution would be to implement e.g. the "rotate log" command in a way that would
       calculate some summary values, put them in a "summary table" and then delete the lines
       used to calculate those values.

       Similar cleanup code could be implemented in an external script and run periodically
       independently from squid log commands.

   Testing
       This script has only been tested in low-volume scenarios (single client, less than 10
       req/s). Tests in high volume environments could reveal performance bottlenecks and bugs.

AUTHOR

       This program was written by Marcello Romani <marcello.romani@libero.it> , Amos Jeffries
       <amosjeffries@squid-cache.org>

COPYRIGHT

        * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
        *
        * Squid software is distributed under GPLv2+ license and includes
        * contributions from numerous individuals and organizations.
        * Please see the COPYING and CONTRIBUTORS files for details.

       Copyright (C) 2008 by Marcello Romani

       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself, either Perl version 5.8.8 or, at your option, any later version of
       Perl 5 you may have available.

QUESTIONS

       Questions on the usage of this program can be sent to the Squid Users mailing list
       <squid-users@lists.squid-cache.org>

REPORTING BUGS

       Bug reports need to be made in English.  See
       https://wiki.squid-cache.org/SquidFaq/BugReporting for details of what you need to include
       with your bug report.

       Report bugs or bug fixes using https://bugs.squid-cache.org/

       Report serious security bugs to Squid Bugs <squid-bugs@lists.squid-cache.org>

       Report ideas for new improvements to the Squid Developers mailing list
       <squid-dev@lists.squid-cache.org>