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Trace Event Script Processing on Devices Running Junos OS

Event script tracing operations track event script operations and record them in a log file. The logged error descriptions provide detailed information to help you solve problems faster.

On Junos OS, the default operation of event script tracing is to log important events, which include errors, warnings, progress messages, and script processing events, in the /var/log/escript.log file on the device. When the file escript.log reaches 128 kilobytes (KB), it is renamed with a number 0 through 9 (in ascending order) appended to the end of the file and then compressed. The resulting files are escript.log.0.gz, then escript.log.1.gz, until there are 10 trace files. Then the oldest trace file (escript.log.9.gz) is overwritten.

Junos OS Evolved captures trace data for all applications by default and collects the data for all script types in trace files that correspond to the cscript application. To view the trace data, issue the show trace application cscript command. For more information, see Trace Script Processing on Devices Running Junos OS Evolved.

Minimum Configuration for Enabling Traceoptions for Event Scripts

If no event script trace options are configured, the simplest way to view the trace output of an event script is to configure the output trace flag and issue the show log escript.log | last command. To do this, perform the following steps:

  1. If you have not done so already, enable an event script by including the file statement at the [edit event-options event-script] hierarchy level:

  2. Enable trace options by including the traceoptions flag output statement at the [edit event-options event-script] hierarchy level:

  3. Commit the configuration.

  4. Display the resulting trace messages recorded in the /var/log/escript.log file. At the end of the log is the output generated by the event script you enabled in Step 1 after a configured event policy is triggered and invokes the script. To display the end of the log, issue the show log escript.log | last operational mode command:

Table 1 summarizes useful filtering commands that display selected portions of the escript.log file.

Table 1: Event Script Tracing Operational Mode Commands

Task

Command

Display logging data associated with all event script processing.

show log escript.log

Display processing for only the most recent operation.

show log escript.log | last

Display processing for script errors.

show log escript.log | match error

Display processing for a particular script.

show log escript.log | match filename

Example: Minimum Configuration for Enabling Traceoptions for Event Scripts

Display the trace output of the event script file source-route.xsl:

Configure Tracing of Event Scripts

You cannot change the directory (/var/log) to which trace files are written. However, you can customize other trace file settings by including the following statements at the [edit event-options event-script traceoptions] hierarchy level:

These statements are described in the following sections:

Configure the Event Script Log Filename

By default, the name of the file that records trace output for event scripts is escript.log. You can specify a different name by including the file statement at the [edit event-options event-script traceoptions] hierarchy level:

Configure the Number and Size of Event Script Log Files

By default, when the trace file reaches 128 KB in size, it is renamed and compressed to filename.0.gz, then filename.1.gz, and so on, until there are 10 trace files. Then the oldest trace file (filename.9.gz) is overwritten.

You can configure the limits on the number and size of trace files by including the following statements at the [edit event-options event-script traceoptions file filename] hierarchy level:

For example, set the maximum file size to 640 KB and the maximum number of files to 20. When the file that receives the output of the tracing operation (filename) reaches 640 KB, it is renamed and compressed to filename.0.gz, and a new file called filename is created. When filename reaches 640 KB, filename.0.gz is renamed filename.1.gz and filename is renamed and compressed to filename.0.gz. This process repeats until there are 20 trace files. Then the oldest file (filename.19.gz) is overwritten.

The number of files can range from 2 through 1000 files. The file size can range from 10 KB through 1 gigabyte (GB).

Note:

If you set either a maximum file size or a maximum number of trace files, you also must specify the other parameter and a filename.

Configure Access to Event Script Log Files

By default, access to the event script log file is restricted to the owner. You can manually configure access by including the world-readable or no-world-readable statement at the [edit event-options event-script traceoptions file filename] hierarchy level.

The no-world-readable statement restricts event script log access to the owner. The world-readable statement enables unrestricted access to the event script log file.

Configure the Event Script Trace Operations

By default, the traceoptions events flag is turned on, regardless of the configuration settings, and only important events are logged. This includes errors, warnings, progress messages, and script processing events. You can configure the trace operations to be logged by including the following statements at the [edit event-options event-script traceoptions] hierarchy level:

Table 2 describes the meaning of the event script tracing flags.

Table 2: Event Script Tracing Flags

Flag

Description

Default Setting

all

Trace all operations.

Off

events

Trace important events, including errors, warnings, progress messages, and script processing events.

On

input

Trace event script input data.

Off

offline

Generate data for offline development.

Off

output

Trace event script output data.

Off

rpc

Trace event script RPCs.

Off

xslt

Trace the Extensible Stylesheet Language Transformations (XSLT) library.

Off

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