# Actions

- Change Node Power State
- Change Nova Service State
- Migrate
- Nop
- Resize
- Sleep
- Stop
- Volume Migration

## Actions Overview

This section provides detailed documentation for each action available in Watcher. Actions are the building blocks of action plans that implement the optimization strategies recommended by the decision engine.

## Available Actions

> Action Name | Description
> --- | ---
> Change Node Power State | Compute node power on/off through Ironic
> Change Nova Service State | Disables or enables the nova-compute service on a host
> Migrate | Migrates a server to a destination nova-compute host (live or cold)
> Resize | Resizes a server with the specified flavor
> Stop | Stops a server instance
> Volume Migration | Migrates a volume to a destination node or type

Following Actions are intended to be used only for testing purposes and do not produce any meaningful task.

> Action Name | Description
> --- | ---
> Nop | Logs a message (testing only)
> Sleep | Waits for a given duration (testing only)

this page last updated: 2026-04-01 21:51:00

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