Directing Messages to a Log File

To direct system log messages to a file on the local disk of the local Routing Engine, include the file statement at the [edit system syslog] hierarchy level:

[edit system syslog]

file filename {

    facility severity;

    explicit-priority;

    match "regular-expression";

    archive {

        files number;

        size size;

        (world-readable | no-world-readable);

    }

}

The default directory for log files is /var/log; to specify a different directory on the local Routing Engine's local disk, include the complete pathname. For the list of logging facilities and severity levels, see Table 7 and Table 8.

To prevent log files from growing too large, the JUNOS system logging utility by default writes messages to a sequence of files of a defined size. By including the archive statement, you can configure the number of files, their maximum size, and who can read them, for either all log files or a certain log file. For more information, see Configuring Log File Archiving.

For information about the explicit-priority statement, see Including Priority in System Log Messages.

For information about the match statement, see Using Regular Expressions to Refine the Set of Logged Messages.