Tags: 101.1, commands, dmesg, linux, logs
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What does Linux use to produce and maintain log files? Where do you configure it?
syslogd - otherwise known as the syslog daemon.
The syslogd daemon handles messages from servers and other user-mode programs. It’s usually paired with a daemon called klogd, which is generally installed from the same sysklogd package as syslogd. The klogd daemon manages logging of kernel messages.
For configuration, this is done through the /etc/syslog.conf file. (The rsyslogd configuration file is /etc/rsyslog.conf and is similar to syslog.conf.)
The syslogd daemon handles messages from servers and other user-mode programs. It’s usually paired with a daemon called klogd, which is generally installed from the same sysklogd package as syslogd. The klogd daemon manages logging of kernel messages.
For configuration, this is done through the /etc/syslog.conf file. (The rsyslogd configuration file is /etc/rsyslog.conf and is similar to syslog.conf.)
Tags: /etc, 101.1, daemon, klog, linux, logs, syslog
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What format do configuration lines in the syslog configuration file use?
facility.priority action
- Facility being the type of program or service
- Priority being the importance of the message
- Action is the file or computer that accepts the message
Tags: /etc, configuration, logs, syslog
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What are some of the valid codes for the facility value? What do they generally mean?
- auth - security/authorization related
- authpriv - privilege related
- cron - cron job related
- daemon - servers/processes that aren't covered by a more specific facilitiy
- kern - kernel related
- lpr -
- mail - used for mail servers and other mail-processing tools
- mark - reserved for internal use
- news - server update/news related
- security - identical to auth, though auth is the preferred facility
- syslog - related to the system logging daemon
- user - user related
- uucp - printing related
- local0 through local7
Asterisk * is a wildcard for all facilities, while the . character can be used to select multiple facilities.
Tags: 101.1, facilities, linux, logs, syslog
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What are the valid codes for the priority portion, and what do they imply?
- debug
- notice
- info
- warning - currently used, self-explanatory
- warn - deprecated
- error - deprecated
- err
- crit
- alert
- emerg
- panic - deprecated
Aside from the deprecated codes, the above are listed in escalating importance.
Tags: 101.1, codes, linux, logs, priority, syslog
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Flashcard set info:
Author: Ryan Robson
Main topic: Informatics
Topic: Linux
City: Houston
Published: 08.02.2011
Card tags:
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