# LXD

> This is the documentation for LXD, a system container and virtual machine manager.


2014-2026 AGPL-3.0, LXD contributors

## Pages in this subsection

- [How to track changed blocks on virtual machine volumes](https://canonical.com/lxd/docs/latest/howto/storage_block_tracking/index.html.md): Changed block tracking records the blocks of a block volume that a guest writes to after a snapshot.

## Optional

- [Top-level llms.txt](https://canonical.com/lxd/docs/latest/llms.txt): Complete documentation index.