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docs: Add storage configuration options to README

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Vincent Ambo 2019-10-28 18:37:31 +01:00 committed by Vincent Ambo
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tools/nixery/README.md
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@ -74,13 +74,17 @@ interactive images.
Nixery supports the following configuration options, provided via environment
variables:
* `BUCKET`: [Google Cloud Storage][gcs] bucket to store & serve image layers
* `PORT`: HTTP port on which Nixery should listen
* `NIXERY_CHANNEL`: The name of a Nix/NixOS channel to use for building
* `NIXERY_PKGS_REPO`: URL of a git repository containing a package set (uses
locally configured SSH/git credentials)
* `NIXERY_PKGS_PATH`: A local filesystem path containing a Nix package set to
use for building
* `NIXERY_STORAGE_BACKEND`: The type of backend storage to use, currently
supported values are `gcs` (Google Cloud Storage) and `filesystem`.
For each of these additional backend configuration is necessary, see the
[storage section](#storage) for details.
* `NIX_TIMEOUT`: Number of seconds that any Nix builder is allowed to run
(defaults to 60)
* `NIX_POPULARITY_URL`: URL to a file containing popularity data for
@ -91,6 +95,26 @@ account key, Nixery will also use this key to create [signed URLs][] for layers
in the storage bucket. This makes it possible to serve layers from a bucket
without having to make them publicly available.
### Storage
Nixery supports multiple different storage backends in which its build cache and
image layers are kept, and from which they are served.
Currently the available storage backends are Google Cloud Storage and the local
file system.
In the GCS case, images are served by redirecting clients to the storage bucket.
Layers stored on the filesystem are served straight from the local disk.
These extra configuration variables must be set to configure storage backends:
* `GCS_BUCKET`: Name of the Google Cloud Storage bucket to use (**required** for
`gcs`)
* `GOOGLE_APPLICATION_CREDENTIALS`: Path to a GCP service account JSON key
(**optional** for `gcs`)
* `STORAGE_PATH`: Path to a folder in which to store and from which to serve
data (**required** for `filesystem`)
## Roadmap
### Kubernetes integration