Juniper Networks J-Series manual System Log Message Destinations, System Logging Facilities

Chapter 8: Monitoring Events and Managing System Log Files

The JUNOS system logging utility is similar to the UNIX syslogd utility. Each system log message identifies the software process that generated the message and briefly describes the operation or error that occurred.

Reboot requests are recorded to the system log files, which you can view with the show log command. Also, you can view the names of any processes running on your system with the show system processes command.

System Log Message Destinations

You can send system logging information to one or more destinations. The destinations can be one or more files, one or more remote hosts, the terminals of one or more users if they are logged in, and the system console.

■To direct messages to a named file in a local file system, see “Sending System Log Messages to a File” on page 160.

■To direct messages to the terminal session of one or more specific users (or all users) when they are logged into the router, see “Sending System Log Messages to a User Terminal” on page 161.

■To direct messages to the router console, see the JUNOS System Log Messages Reference.

■To direct messages to a remote machine that is running the UNIX syslogd utility, see the JUNOS System Log Messages Reference.

System Log Facilities and Severity Levels

When specifying the destination for system log messages, you can specify the class (facility) of messages to log and the minimum severity level (level) of the message for each location.

Each system log message belongs to a facility, which is a group of messages that are either generated by the same software process or concern a similar condition or activity.

Table 81 on page 157 lists the system logging facilities, and Table 82 on page 158 lists the system logging severity levels. For more information about system log messages, see the JUNOS System Log Messages Reference.

Table 81: System Logging Facilities

Facility	Description
any	Any facility
authorization	Any authorization attempt
change-log	Any change to the configuration
cron	Cron scheduling process
daemon	Various system processes

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