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syslogd and syslog.conf
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The syslogd daemon manages all the logs on your system, as well as coordinating with any of the logging operations of other systems on your network. Configuration information for syslogd is held in the /etc/syslog.conf file, which contains the names and locations for your system log files. Here you find entries for /var/log/messages and /var/log/maillog, among others. Whenever you make changes to the syslog.conf file, you need to restart the syslogd daemon using the following command (or use redhat-config-services, Server Settings | Services): service syslog restart
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An entry in syslog.conf consists of two fields: a selector and an action. The selector is the kind of service to be logged, such as mail or news, and the action is the location where messages are to be placed. The action is usually a log file, but it can also be a remote host or a pipe to another program. This kind of service is referred to as a facility. syslogd has several terms it uses to specify certain kinds of service (see Table 1-9). A facility can be further qualified by a priority. A priority specifies the kind of message generated by the facility. syslogd uses several designated terms to indicate different priorities. A sector is constructed from both the facility and priority, separated by a period. For example, to save error messages generated by mail systems, you use a sector consisting of the mail facility and the err priority, as shown here: mail.err To save these messages to the /var/log/maillog file, you specify that file as the action, giving you the following entry: mail.err /var/log/maillog syslogd also supports the use of * as a matching character to match either all the facilities or priorities in a sector. cron.* would match on all cron messages no matter what the priority, *.err would match on error messages from all the facilities, and *.* would match on all messages. The following example saves all mail messages to the /var/log/maillog file and all critical messages to the /var/log/mycritical file: mail.* /var/log/maillog *.crit /var/log/mycritical
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When you specify a priority for a facility, all messages with a higher priority are also included. So the err priority also includes the crit, alert, and emerg priorities. If you just want to select the message for a specific priority, you qualify the priority with the = operator. For example, mail.=err
Basic System Administration
Facilities auth priv cron daemon kern lpr mail mark news syslog user uucp
Description Security/authorization messages (private) Clock daemon (cron and at) messages Other system daemon messages Kernel messages Line printer subsystem messages Mail subsystem messages Internal use only Usenet news subsystem messages Syslog internal messages Generic user-level messages UUCP subsystem messages
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local0 through Reserved for local use local7 Priorities debug info notice warning err crit alert emerg Operators * = ! / @ | Table 1-9. Description 7, Debugging messages, lowest priority 6, Informational messages 5, Notifications, normal, but significant, condition 4, Warnings 3, Error messages 2, Critical conditions 1, Alerts, action must be taken immediately 0, Emergency messages, system is unusable , highest priority Description Matches all facilities or priorities in a sector Restrict to a specified priority Exclude specified priority and higher ones A file to save messages to A host to send messages to FIFO pipe to send messages to Syslogd Facilities, Priorities, and Operators
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will select only error messages, not crit, alert, and emerg messages. You can also restrict priorities with the ! operator. This will eliminate messages with the specified priority and higher. For example, mail.!crit will exclude crit messages, and the higher alert and emerg messages. To specifically exclude all the messages for an entire facility, you use the none priority. mail.none excludes all mail messages. This is usually used when you re defining several sectors in the same entry. You can list several priorities or facilities in a given sector by separating them with commas. You can also have several sectors in the same entry by separating them with semicolons. The first example saves to the /var/log/messages file all messages with info priority, excluding all mail, and authentication messages (authpriv). The second saves all crit messages and higher for the uucp and news facilities to the /var/log/spooler file:
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