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# Image building
The `tools/build-docker-image` script in this repository is
responsible for building docker images. It is symlinked as `./build`
inside each Docker image directory.
When creating new image directories, you can run the
`tools/update-build-links` scripts to install the `build` symlink
(this script will install the symlink anywhere it find a file named
`Dockerfile`).
## Workflow
In general, you will build images like this:
$ cd docker/keystone
$ ./build
By default, the above command would build
`kollaglue/centos-rdo-keystone:CID`, where `CID` is the current short
commit ID. That is, given:
$ git rev-parse HEAD
76a16029006a2f5d3b79f1198d81acb6653110e9
The above command would generate
`kollaglue/centos-rdo-keystone:76a1602`. This tagging is meant to
prevent developers from stepping on each other or on release images
during the development process.
To push the image after building, add `--push`:
$ ./build --push
To use these images, you must specify the tag in your `docker run`
commands:
$ docker run kollaglue/centos-rdo-keystone:76a1602
## Building releases
To build into the `latest` tag, add `--release`:
$ ./build --release
Or to build and push:
$ ./build --push --release
## Build all images at once
The `build-all-docker-images` script in the tools directory is a wrapper for
the `build-docker-image` that builds all images, as the name suggests, in the
correct order. It responds to the same options as `build-docker-image` with the
additional `--from` and `--to` options that allows building only images that
have changed between the specified git revisions.
For example, to build all images contained in docker directory and push new release:
$ tools/build-all-docker-images --release --push
To build only images modified in test-branch along with their children:
$ tools/build-all-docker-images --from master --to test-branch
## Configuration
The `build-docker-image` script will look for a file named `.buildconf`
in the image directory and in the top level of the repository. You
can use this to set defaults, such as:
NAMESPACE=larsks
PREFIX=fedora-rdo-
This setting would cause images to be tagged into the `larsks/`
namespace and use Fedora as base image instead of the default CentOS.
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