Tracing Static Subscriber Operations

Static subscribers support tracing operations. Static subscriber tracing operations track static subscriber operations and record them in a log file. The error descriptions captured in the log file provide detailed information to help you solve problems.

By default, nothing is traced. When you enable the tracing operation, the default tracing behavior is as follows:

1. Important events are logged in a file called jsscd located in the /var/log directory. You cannot change the directory (/var/log) in which trace files are located.
2. When the file jsscd reaches 128 kilobytes (KB), it is renamed jsscd.0, then jsscd.1, and so on, until there are three trace files. Then the oldest trace file (jsscd.2) is overwritten.

   You can optionally configure the maximum file size to be from 10 KB through 1 gigabyte (GB). You can also specify the number of trace files to be from 2 through 1000. (For more information about how log files are created, see the JUNOS System Log Messages Reference.)

By default, only the user who configures the tracing operation can access log files. You can optionally configure read-only access for other users.

To configure static subscriber tracing operations:

1. Specify that you want to configure tracing options.

   [edit system processes static-subscribers]

   user@host# edit traceoptions

2. (Optional) Configure the name for the file used for the trace output.

   See trace log filename.

3. (Optional) Configure the number and size of the log files.

   See number size of files.

4. (Optional) Configure access to the log file.

   See access to log file.

5. (Optional) Configure a regular expression to filter logging events.

   See regular expression.

6. (Optional) Configure flags to filter the operations to be logged.

   See flags.

The static subscriber traceoptions operations are described in the following sections:

• Configuring the Static Subscribers Trace Log Filename
• Configuring the Number and Size of Static Subscribers Log Files
• Configuring Access to the Static Subscribers Log File
• Configuring a Regular Expression for Static Subscriber Lines to Be Logged
• Configuring the Static Subscribers Tracing Flags

Configuring the Static Subscribers Trace Log Filename

By default, the name of the file that records trace output for static subscribers is jsscd. You can specify a different name with the file option.

To configure the filename for static subscribers tracing operations:

• Specify the name of the file used for the trace output.

  [edit system processes static-subscribers traceoptions]

  user@host# set file stat-subs_1

Configuring the Number and Size of Static Subscribers Log Files

By default, when the trace file reaches 128 kilobytes (KB) in size, it is renamed filename.0, then filename.1, and so on, until there are three trace files. Then the oldest trace file (filename.2) is overwritten.

You can optionally configure the maximum file size to be from 10 KB through 1 gigabyte (GB). You can also specify the number of trace files to be from 2 through 1000.

For example, you can set the maximum file size to 2 MB, and the maximum number of files to 20. When the file that receives the output of the tracing operation (filename) reaches 2 MB, filename is renamed filename.0, and a new file called filename is created. When the new filename reaches 2 MB, filename.0 is renamed filename.1 and filename is renamed filename.0. This process repeats until there are 20 trace files. Then the oldest file (filename.19) is overwritten by the newest file (filename.0).

To configure the number and size of trace files:

• Specify the name, number, and size of the file used for the trace output.

  [edit system processes static-subscribers traceoptions]

  user@host# set file stat-subs_1 _logfile_1 files 20 size 2097152

Configuring Access to the Static Subscribers Log File

By default, only the user who configures the tracing operation can access the log files. You can enable all users to read the log file and you can explicitly set the default behavior of the log file.

To specify that all users can read the log file:

• Configure the log file to be world-readable.

  [edit system processes static-subscribers traceoptions]

  user@host# set file stat-subs_1 _logfile_1 world-readable

To explicitly set the default behavior, only the user who configured tracing can read the log file:

• Configure the log file to be no-world-readable.

  [edit system processes static-subscribers traceoptions]

  user@host# set file stat-subs_1 _logfile_1 no-world-readable

Configuring a Regular Expression for Static Subscriber Lines to Be Logged

By default, the trace operation output includes all lines relevant to the logged events.

You can refine the output by including regular expressions to be matched.

To configure regular expressions to be matched:

• Configure the regular expression.

  [edit system processes static-subscribers traceoptions]

  user@host# set file stat-subs_1 _logfile match regex

Configuring the Static Subscribers Tracing Flags

By default, only important events are logged. You can specify which trace operations are logged by including specific tracing flags. The following table describes the flags that you can include.

To configure the flags for the events to be logged:

• Configure the flags.

  [edit system processes static-subscribers traceoptions]

  user@host# set flag authentication