Example: Generate a Custom Warning Message
Junos OS commit scripts can generate custom warning messages during a commit operation to alert you when the configuration does not comply with custom configuration rules. The commit process is not affected by warnings. This example creates a commit script that generates a custom warning message when a specific statement is not included in the device configuration.
Requirements
Junos OS Release 16.1R3 or later release when using a Python script.
Overview and Commit Script
Using a commit script, write a custom warning message that appears
when the source-route statement is not included at the [edit chassis] hierarchy level.
The script is shown in XSLT, SLAX, and Python.
XSLT Syntax
<?xml version="1.0" standalone="yes"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:junos="http://xml.juniper.net/junos/*/junos"
xmlns:xnm="http://xml.juniper.net/xnm/1.1/xnm"
xmlns:jcs="http://xml.juniper.net/junos/commit-scripts/1.0">
<xsl:import href="../import/junos.xsl"/>
<xsl:template match="configuration">
<xsl:if test="not(chassis/source-route)">
<xnm:warning>
<xsl:call-template name="jcs:edit-path">
<xsl:with-param name="dot" select="chassis"/>
</xsl:call-template>
<message>IP source-route processing is not enabled.</message>
</xnm:warning>
</xsl:if>
</xsl:template>
</xsl:stylesheet>SLAX Syntax
version 1.2;
ns junos = "http://xml.juniper.net/junos/*/junos";
ns xnm = "http://xml.juniper.net/xnm/1.1/xnm";
ns jcs = "http://xml.juniper.net/junos/commit-scripts/1.0";
import "../import/junos.xsl";
match configuration {
if (not(chassis/source-route)) {
<xnm:warning> {
call jcs:edit-path($dot = chassis);
<message> "IP source-route processing is not enabled.";
}
}
}Python Syntax
from junos import Junos_Configuration
import jcs
def main():
root = Junos_Configuration
if not(root.xpath("./chassis/source-route")):
jcs.emit_warning("IP source-route processing is not enabled.")
if __name__ == '__main__':
main()
Configuration
Procedure
Step-by-Step Procedure
Download, enable, and test the script. To test that a
commit script generates a warning message correctly, make sure that
the candidate configuration contains the condition that elicits the
warning. For this example, ensure that the source-route statement is not included at the [edit chassis] hierarchy
level.
To test the example in this topic:
Copy the script into a text file, name the file source-route.xsl, source-route.slax, or source-route.py as appropriate, and copy it to the /var/db/scripts/commit/ directory on the device.
Note:Unsigned Python scripts must be owned by either root or a user in the Junos OS
super-userlogin class, and only the file owner can have write permission for the file.In configuration mode, configure the
filestatement and the script filename at the[edit system scripts commit]hierarchy level.[edit] user@host# set system scripts commit file source-route.xsl
If the script is written in Python, enable the execution of unsigned Python scripts.
[edit] user@host# set system scripts language python
Note:Configure the
language python3statement to use Python 3 to execute Python scripts, or configure thelanguage pythonstatement to use Python 2.7 to execute Python scripts. For more information, see language.If the
source-routestatement is included at the[edit chassis]hierarchy level, issue thedelete chassis source-routeconfiguration mode command.[edit] user@host# delete chassis source-route
Verification
Verifying Script Execution
Purpose
Verify the warning message generated by the commit script.
Action
Execute the commit check or commit command
and review the output. The commit script generates a warning message
when the source-route statement is not included at the [edit chassis] hierarchy level of the configuration. The warning
does not affect the commit process.
[edit] user@host# commit check [edit chassis] warning: IP source-route processing is not enabled. configuration check succeeds
[edit] user@host# commit [edit chassis] warning: IP source-route processing is not enabled. commit complete
To display the XML-formatted version of the warning
message, issue the commit check | display xml command.
[edit]
user@host# commit check | display xml
<rpc-reply xmlns:junos="http://xml.juniper.net/junos/10.0R1/junos">
<commit-results>
<routing-engine junos:style="normal">
<name>re0</name>
<xnm:warning>
<edit-path>
[edit chassis]
</edit-path>
<message>
IP source-route processing is not enabled.
</message>
</xnm:warning>
<commit-check-success/>
</routing-engine>
</commit-results>
</rpc-reply>To display a detailed trace of commit script processing,
issue the commit check | display detail command.
[edit] user@host# commit check | display detail 2009-06-15 14:40:29 PDT: reading commit script configuration 2009-06-15 14:40:29 PDT: testing commit script configuration 2009-06-15 14:40:29 PDT: opening commit script '/var/db/scripts/commit/source-route-warning.xsl' 2009-06-15 14:40:29 PDT: reading commit script 'source-route-warning.xsl' 2009-06-15 14:40:29 PDT: running commit script 'source-route-warning.xsl' 2009-06-15 14:40:29 PDT: processing commit script 'source-route-warning.xsl' [edit chassis] warning: IP source-route processing is not enabled. 2009-06-15 14:40:29 PDT: no errors from source-route-warning.xsl 2009-06-15 14:40:29 PDT: saving commit script changes 2009-06-15 14:40:29 PDT: summary: changes 0, transients 0 (allowed), syslog 0 2009-06-15 14:40:29 PDT: no commit script changes 2009-06-15 14:40:29 PDT: exporting juniper.conf 2009-06-15 14:40:29 PDT: expanding groups 2009-06-15 14:40:29 PDT: finished expanding groups 2009-06-15 14:40:29 PDT: setup foreign files 2009-06-15 14:40:29 PDT: propagating foreign files 2009-06-15 14:40:30 PDT: complete foreign files 2009-06-15 14:40:30 PDT: daemons checking new configuration configuration check succeeds