How to manage actions

See also: Action

This document demonstrates how to manage actions.

Contents:

List all actions

See also: juju actions

To list the actions defined for a deployed application, use the actions command followed by the deployed charm’s name. For example, assuming you’ve already deployed the git charm, you can find out the actions it supports as below:

juju actions git

This should output:

Action            Description
add-repo          Create a git repository.
add-repo-user     Give a user permissions to access a repository.
add-user          Create a new user.
get-repo          Return the repository's path.
list-repo-users   List all users who have access to a repository.
list-repos        List existing git repositories.
list-user-repos   List all the repositories a user has access to.
list-users        List all users.
remove-repo       Remove a git repository.
remove-repo-user  Revoke a user's permissions to access a repository.
remove-user       Remove a user.

By passing various options, you can also do a number of other things such as specify a model or an output format or request the full schema for all the actions of an application. Below we demonstrate the --schema and --format options:

juju actions git --schema --format yaml

Partial output:

add-repo:
  additionalProperties: false
  description: Create a git repository.
  properties:
    repo:
      description: Name of the git repository.
      type: string
  required:
  - repo
  title: add-repo
  type: object

The full schema is under the properties key of the root action. Actions rely on JSON-Schema for validation. The top-level keys shown for the action (description and properties) may include future additions to the feature.

Show details about an action

See also: juju show-action

To see detailed information about an application action, use the show-action command followed by the name of the charm and the name of the action. For example, the code below will show detailed information about the backup action of the postgresql application.

juju show-action postgresql backup

Run an action

See also: juju run (before juju v.3.0, run-action)

To run an action on a unit, use the run command followed by the name of the unit and the name of the action you want to run.

juju run mysql/3 backup

By using various options, you can choose to run the action in the background, specify a timeout time, pass a list of actions in the form of a YAML file, etc. See the command reference doc for more.

Running an action returns the overall operation ID as well as the individual task ID(s) for each unit.

Starting with juju v.3.0, actions are composed of tasks and operations , where an action defines a named unit of work (e.g., back up the database) that can be executed on selected units, a task is the execution of the action on each target unit, and an operation is the group of tasks queued by running an action across one or more units.

View the pending, running, or completed operations

See also: juju operations

To view the pending, running, or completed status of each juju run ... <action> invocation, run the operations command:

juju operations

This will show the operations corresponding to the actions for all the application units. You can filter this by passing various options (e.g., --actions backup, --units mysql/0, --machines 0,1, --status pending,completed, etc.).

Show details about an operation

See also: juju show-operation

To see the status of the individual tasks belonging to a given operation, run the show-operation command followed by the operation ID.

juju show-operation 1

As usual, by adding various options, you can specify specify an output format, choose to watch indefinitely or specify a timeout time, etc.

Show details about a task

See also: juju show-task

To drill down to the result of running an action on a specific unit (the stdout, stderror, log messages, etc.), use the show-task command followed by the task ID (returned by the run command). For example,

juju show-task 1

Cancel a task

See also: juju cancel-task

Suppose you’ve run an action but would now like to cancel the resulting pending or running task. You can do so using the cancel-task command. For example:

juju cancel-task 1

Debug an action

See also: juju debug-code, juju debug-hooks, How to debug charm hooks

To debug an action (or more), use the debug-hooks command followed by the name of the unit and the name(s) of the action(s). For example, if you want to check the add-repo action of the git charm, use:

juju debug-hooks git/0 add-repo

Last updated 6 days ago.