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Signed-off-by: Stéphane Graber <[email protected]>
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5 changes: 5 additions & 0 deletions AUTHORS
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Unless mentioned otherwise in a specific file's header, all code in this
project is released under the Apache 2.0 license.

The list of authors and contributors can be retrieved from the git
commit history and in some cases, the file headers.
71 changes: 71 additions & 0 deletions CONTRIBUTING.md
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# Contributing
## Pull requests
Changes to this project should be proposed as pull requests on Github
at: <https://github.com/stgraber/lxd-github-actions>

Proposed changes will then go through code review there and once acked,
be merged in the main branch.

## License and copyright
By default, any contribution to this project is made under the Apache
2.0 license.

The author of a change remains the copyright holder of their code
(no copyright assignment).


## Developer Certificate of Origin
To improve tracking of contributions to this project we use the DCO 1.1
and use a "sign-off" procedure for all changes going into the branch.

The sign-off is a simple line at the end of the explanation for the
commit which certifies that you wrote it or otherwise have the right
to pass it on as an open-source contribution.

> Developer Certificate of Origin
> Version 1.1
>
> Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
> 660 York Street, Suite 102,
> San Francisco, CA 94110 USA
>
> Everyone is permitted to copy and distribute verbatim copies of this
> license document, but changing it is not allowed.
>
> Developer's Certificate of Origin 1.1
>
> By making a contribution to this project, I certify that:
>
> (a) The contribution was created in whole or in part by me and I
> have the right to submit it under the open source license
> indicated in the file; or
>
> (b) The contribution is based upon previous work that, to the best
> of my knowledge, is covered under an appropriate open source
> license and I have the right under that license to submit that
> work with modifications, whether created in whole or in part
> by me, under the same open source license (unless I am
> permitted to submit under a different license), as indicated
> in the file; or
>
> (c) The contribution was provided directly to me by some other
> person who certified (a), (b) or (c) and I have not modified
> it.
>
> (d) I understand and agree that this project and the contribution
> are public and that a record of the contribution (including all
> personal information I submit with it, including my sign-off) is
> maintained indefinitely and may be redistributed consistent with
> this project or the open source license(s) involved.
An example of a valid sign-off line is:

```
Signed-off-by: Random J Developer <[email protected]>
```

Use your real name and a valid e-mail address.
Sorry, no pseudonyms or anonymous contributions are allowed.

We also require each commit be individually signed-off by their author,
even when part of a larger set. You may find `git commit -s` useful.
202 changes: 202 additions & 0 deletions COPYING
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/

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74 changes: 74 additions & 0 deletions README.md
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# Introduction
This repository contains some scripts to create LXD instances suitable
to be used as Github Actions runners as well as tools to spawn a set of
such instances.

Self-hosted Github Actions runners allow for more powerful test runners,
testing with physical hardware attached (USB, serial, GPU, ...), testing
on otherwise unavailable architectures and more.

This will use LXD with a set of ephemeral instances which will then be
added as Github Runners. Each of those will process exactly one job and
then self-destroy. This is to avoid running jobs in unclean
environments, preventing one job from impacting or attacking the next.

# Creating a suitable base instance
Either containers or VMs can be use for this.

For example, for an Ubuntu 20.04 container, you'd use:
```
lxc launch images:ubuntu/20.04 base-container
```

For a VM:
```
lxc launch images:ubuntu/20.04 base-vm
```

(From this point on, I'll refer to that instance as `base-XYZ`)

You'll then use `lxc exec base-XYZ bash` to get a shell inside of the
environment and customize it in whatever way you see fit for your use.
This can be automated with the likes of a shell script, Ansible or Packer.

Now you'll need to fetch the action token from:
https://github.com/ORG/REPO/settings/actions/runners/new

Once you're done, you need to get it ready for use with Github, for that, run:

```
./prepare-instance base-XYZ https://github.com/ORG/REPO TOKEN
```

You can also pass additional labels like this:

```
./prepare-instance base-XYZ https://github.com/ORG/REPO TOKEN vm,gpu
```

Then stop the instance with `lxc stop base-XYZ`.

And before it's ready for use, let's set some limits and security options on it:
- lxc config set base-XYZ security.idmap.isolated=true (only useful for containers)
- lxc config set base-XYZ limits.cpu=2 limits.memory=4GiB
- lxc config device override base-XYZ root size=20GiB

This restricts resources to 2 vCPU, 4GB of RAM and 20GB of disk. Adapt this to whatever makes sense for you.

# Starting some runners
Lastly, you need a set of instances to start and register with Github:

```
./spawn base-XYZ 10
```

This will start an initial set of 10 instances.

# What's next
Currently, the instances will just go away once they're done processing a job, so you'll have to keep adding more with `./spawn`.
This isn't ideal but can be scripted around easily enough.

In the future, it'd be better to have a more complex script or program
which keeps track of instances, can check how many are ready, how many
are in use and re-plenish the pool so that there always are a couple of
instances ready up to a maximum that the system can handle.

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