Executing a Clean

This page contains the information required to execute pyATS Clean and its available arguments. There are two different methods of using pyATS Clean – Integrated or Standalone.

Prerequisites

To use pyATS clean with either method, the following is required:

• Testbed YAML file

• Clean YAML file

Running before a pyATS Script

Running before a pyATS script is designed to make sure the device is in a good state, has the correct image, and the expected configuration.

Run with this command:

pyats run job </path/to/job.py> --testbed-file </path/to/testbed.yaml> --clean-file </path/to/clean.yaml> --invoke-clean

Running without a pyATS Script

Running without a pyATS script is designed to only clean the device; there isn’t a need to run a pyATS Script after.

Run with this command:

pyats clean --testbed-file </path/to/testbed.yaml> --clean-file </path/to/clean.yaml>

Passing images through CLI

Providing the images through CLI arguments

• Can provide a new image at every run without modifying the Clean YAML file.

• Can provide the image to a specific device, to all devices in a group, to all devices with a given OS, or all devices with a specific platform.

• --clean-device-image, --clean-os-image, --clean-group-image and --clean-platform-image can all be specified simultaneously. Conflicts are resolved by device > group > platform > os.

• Images specified with the CLI override images specified in the YAML file, i.e. CLI device > CLI group > CLI platform > CLI os > YAML device > YAML group > YAML platform > YAML os

# Example of passing an image to a device called 'PE1'
pyats clean --clean-device-image PE1:</path/to/image.bin> --testbed-file </path/to/testbed.yaml> --clean-file </path/to/clean.yaml>

# Example of passing an image to all devices with the 'nxos' os
pyats clean --clean-os-image nxos:</path/to/image.bin> --testbed-file </path/to/testbed.yaml> --clean-file </path/to/clean.yaml>

# Example of passing an image to all devices belonging to a group called 'group1'
pyats clean --clean-group-image group1:</path/to/image.bin> --testbed-file </path/to/testbed.yaml> --clean-file </path/to/clean.yaml>

# Example of passing an image to all devices with the 'n9k' platform
pyats clean --clean-platform-image n9k:</path/to/image.bin> --testbed-file </path/to/testbed.yaml> --clean-file </path/to/clean.yaml>

Image names can use Callable Markup which will be replaced by the return value of the callable

# Example of passing an image to a device called 'PE1' using a callable
pyats clean --clean-device-image 'PE1:%CALLABLE{path.to.callable(args)}' --testbed-file </path/to/testbed.yaml> --clean-file </path/to/clean.yaml>

CLI image format

• Single image

--clean-device-image PE1:/path/to/image.bin

is equivalent to the following in Clean YAML:

images:
- /path/to/image.bin

• URL image

--clean-device-image PE1:http://<url>:21/path/to/image.bin

is equivalent to the following in Clean YAML:

images:
- http://<url>:21/path/to/image.bin

• List of images

--clean-device-image PE1:/path/to/image.bin PE1:/path/to/optional_package1

is equivalent to the following in Clean YAML:

images:
- /path/to/image.bin
- /path/to/optional_package1

• Key structure

--clean-device-image PE1:image:file:/path/to/image.bin PE1:packages:file:/path/to/optional_package1 PE1:packages:file:/path/to/optional_package2

is equivalent to the following in Clean YAML:

images:
  image:
    file:
    - /path/to/image.bin
  packages:
    file:
    - /path/to/optional_package1
    - /path/to/optional_package2

Clean Schema Validation

Validating your clean datafile is very useful when writing a new clean as it gives immediate feedback.

Run with this command:

pyats validate clean --testbed-file /path/to/testbed.yaml --clean-file /path/to/clean.yaml