I needed a tool to call from a shell script which could generate new configuration statements for Juniper devices, based on existing config, and load the new configuration to the devices automatically. This tool fits the bill; uses net/ssh, REXML, Erubis, and my own cobbled-together object for interacting with JunOScript.

Pass it SSH credentials, a hostname, and an Erubis template. The REXML::Document object current_config is available from within the template; perform XPath searches (or walk the document) to access the existing configuration. This makes it much easier to build config changes.

Usage: loadconfig [options]
    -u, --username=USERNAME          Juniper username
    -p, --password=PASSWORD          Juniper password
    -k, --ssh-key=KEYFILE            Juniper SSH key filename
    -H, --hostname=HOSTNAME          Hostname of Juniper device
    -f, --filename=FILENAME          Filename of configuration snippet to load
    -n, --dryrun                     Verify configuration commit would succeed but do not commit
    -d, --debug                      Output JunOScript interactions
    -h, --help                       Display usage message

Juniper publishes some great material on JunOScript automation, which is invaluable in learning how to use this tool.

• JunOScript Documentation
• This Week: Applying JunOS Automation
• This Week: JunOS Automation Reference for SLAX 1.0

Released under the MIT license. See the file LICENSE.