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log { source(s_sys); filter(f_defaultmessages); destination(d_defaultmessages); }; log { source(s_sys); filter(f_authentication); destination(d_authentication); }; log { source(s_sys); filter(f_mail); destination(d_mail); }; log { source(s_sys); filter(f_emerg); destination(d_allusers); destination(d_console); }; log { source(s_sys); filter(f_bootlog); destination(d_bootlog); }; log { source(s_sys); filter(f_cron); destination(d_cron); }; To make sure you fully understand what the syslog-ng.conf file is doing, let s step through one of the items being logged here. In the s_sys source statement, you are collecting from the standard logging device, /dev/log. unix-dgram ("/dev/log"); Amongst the messages to this device are security-related messages sent to the auth and auth-priv facilities. In the following line, I have defined a filter statement, f_authentication, to pick these up: filter f_authentication { facility(authpriv) or facility(auth); }; Next I have defined a destination for the messages, d_authentication. This destination that writes to a file in the /var/log directory is called secure. destination d_authentication { file("/var/log/secure"); }; In the global options{} block, I have told syslog-NG using the owner, group, and perm options that this file will be owned by the root user and group and have permissions of 0600 (which allows only the owner to read and write to it).

Lastly, I have defined a log{} statement to actually do the logging itself. log { source(s_sys); filter(f_authentication); destination(d_authentication); }; The log{} statement combines the previous statements to perform the logging function. With the steps defined here, you should be able to build your own logging statements using the powerful options available to you with syslog-NG.

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So why log to a database If you need to store logs for any length of time, most probably for some statistical purpose or because of the need for an audit trail, you should look at logging to a database, because it will make the task considerably easier. Querying megabytes of text files containing log messages using tools such as grep is cumbersome and prone to error. An SQL database, on the other hand, is designed to be queried via a variety of tools. You can even enable ODBC on your database flavor and query it with third-party tools such as Crystal Reports. This also makes the process of pruning and purging your log entries easier, as you can build SQL queries to perform this task much more simply and with considerably more precision than with file-based log archives. So if you have the why of it, then how do you do it I will assume you are using syslog-NG for your logging; however, if you decide to retain syslogd, then you can find a link in the Resources section to instructions for enabling database logging from syslogd.

s Note For the backend database I have chosen to use MySQL, but it is also possible to log to PostgreSQL or even Oracle. This section assumes you have MySQL installed and running on your logging system. See the Resources section for more information.

The compensation has been earned but not yet paid Take some time to reflect Remain calm, and the knowledge will come to the forefront of your mind Allow yourself to become agitated, and panic will take over Expect some questions to throw you Work to control the situation and to keep calm TAKE SOME RISKS Even the best athletes aren t going to keep winning without taking some risks Don t be afraid to take some risk Every now and then, decide that you.

The architecture of database logging is simple. syslog-NG logs the messages you want to store to a pipe, and a script reads those entries from the pipe and writes them to the database. I have used d_mysql as the name of the destination in syslog-NG, mysql.pipe as the name of the proposed pipe, and syslog.logs as the name of the database table. See Figure 5-2.

Figure 5-2. Logging to a database So first you need to tell syslog-NG where to send the messages you want to store to a pipe. I will assume you are going to store all messages sent to the s_sys source. Listing 5-25 shows the statements needed to log to the database. You can add these to the configuration file in Listing 5-24 to allow you to test database logging.

Listing 5-25. syslog-NG Statements to Log to a Database destination d_mysql { pipe("/tmp/mysql.pipe" template("INSERT INTO logs (host, facility, priority, level, tag, date, time, program, msg) VALUES( '$HOST','$FACILITY', '$PRIORITY', '$LEVEL', '$TAG', '$YEAR-$MONTH-$DAY', '$HOUR:$MIN:$SEC', '$PROGRAM', '$MSG' );\n") template-escape(yes)); }; log { source(s_sys); destination(d_mysql); };

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