How to create images#
If you want to create and share your own images, you can do this either based on an existing instance or snapshot or by building your own image from scratch.
Publish an image from an instance or snapshot#
If you want to be able to use an instance or an instance snapshot as the base for new instances, you should create and publish an image from it.
To publish an image from an instance, make sure that the instance is stopped. Then enter the following command:
lxc publish <instance_name> [<remote>:]
To publish an image from a snapshot, enter the following command:
lxc publish <instance_name>/<snapshot_name> [<remote>:]
In both cases, you can specify an alias for the new image with the
--alias flag, set an expiration date with
--expire and make the image publicly available with
lxc publish --help for a full list of available flags.
The publishing process can take quite a while because it generates a tarball from the instance or snapshot and then compresses it. As this can be particularly I/O and CPU intensive, publish operations are serialized by LXD.
Prepare the instance for publishing#
Before you publish an image from an instance, clean up all data that should not be included in the image. Usually, this includes the following data:
Instance metadata (use
lxc config metadatato edit)
File templates (use
lxc config templateto edit)
Instance-specific data inside the instance itself (for example, host SSH keys and
Build an image#
For building your own images, you can use
distrobuilder documentation for instructions for installing and using the tool.