Concourse CI docker image

A docker image for concourse using the standalone distribution.

It provides entry points for concourse web as well as for concourse worker.

Table of content

• Links
• Building
• Running
  • Run concourse web
  • Run concourse worker
  • Run single node concourse web/worker
• Test
• License

Links

• Concourse home page
• Image on docker hub
• Travis-CI build
• Source code repository

Building

Just run

docker build -t <image tag> .

Running

Run concourse web

For the default configuration just run

docker run --entrypoint concourse-web.sh meteogroup/concourse-ci

By default all keys are generated. The public key for TSA is printed to stdout as well as the private key workers may use to register with TSA!

It is possible to mount a directory containing required keys for TSA into /var/lib/concourse/keys. The following files are looked up there:

• tsa_key will be used as private TSA host key
• authorized_worker_keys will be used to verify workers. It will be reread each time a worker connects to the TSA.

docker run --entrypoint concourse-web.sh \
  -v /path/to/dir/containing/keys:/var/lib/concourse/keys \
  meteogroup/concourse-ci

To allow sharing /var/lib/concourse/keys between concourse web and concourse worker, private keys may be accessible by root only. They are copied and made accessible to concourse web which will be run as non-root user.

A single public key can be passed in the CONCOURSE_WORKER_PUBKEY environment variable. If /var/lib/concourse/keys is writable by the container authorized_worker_keys will be created from that key and used instead. Otherwise the key in CONCOURSE_WORKER_PUBKEY is used as sole key to verify workers.

If concourse web is firewalled or run behind a proxy the external visible URL can be configured by setting the CONCOURSE_URL environment variable.

docker run --entrypoint concourse-web.sh \
  --env CONCOURSE_URL=http://192.168.99.100:8080 \
  meteogroup/concourse-ci

The default login is concourse with password ci . This can be changed by setting the CONCOURSE_LOGIN and CONCOURSE_PASSWORD environment variables.

docker run --entrypoint concourse-web.sh \
  --env CONCOURSE_LOGIN=ci-user \
  --env CONCOURSE_PASSWORD=rumpelstiltskin \
  meteogroup/concourse-ci

The image comes with an internal postgres database (which will be lost when the container is removed). To use an external postgres database set the CONCOURSE_DATA_SOURCE environment variable.

docker run --entrypoint concourse-web.sh \
  --env CONCOURSE_DATA_SOURCE=postgres://pg-user:pg-password@192.168.99.100 \
  meteogroup/concourse-ci

Run a concourse worker

To run a worker use

docker run --entrypoint concourse-worker.sh --privileged \
  meteogroup/concourse-ci

As concourse worker is running containers for builds it is essential to run it in privileged mode and have a none layering filesystem mounted to /var/lib/concourse/work. Your builds will break and/or hang indefinitely otherwise.

By default the TSA public key will be fetched from the TSA server during startup and a key pair is generated for the worker. The public worker key is then printed to stdout and has to be added to the authorized worker keys for TSA.

The TSA host and port can be configured by setting the CONCOURSE_TSA_HOST and CONCOURSE_TSA_PORT environment variables. By default the worker tries to register at 0.0.0.0:2222.

docker run --entrypoint concourse-worker.sh \
  --privileged --v /var/lib/concourse/work \
  --env CONCOURSE_TSA_HOST=192.168.99.100 \
  --env CONCOURSE_TSA_PORT=2222 \
  meteogroup/concourse-ci

It is possible to mount a directory containing required keys for the worker into /var/lib/concourse/keys. The following files are looked up there:

• tsa_key.pub will be used as public TSA host key
• worker_key will be used as the workers private host key.

If /var/lib/concourse/keys is writable by the container the workers public key is appended authorized_worker_keys (which will be created if it not exists). After keys are setup /var/lib/concourse/keys will be unmounted from the container to protect private keys.

docker run --entrypoint concourse-worker.sh \
  --privileged --v /var/lib/concourse/work \
  -v /path/to/dir/containing/keys:/var/lib/concourse/keys \
  meteogroup/concourse-ci

The workers private key may be passed in the CONCOURSE_WORKER_KEY environment variable. In that case /var/lib/concourse/keys/worker_key is ignored.

The public TSA host key can be passed in the CONCOURSE_TSA_PUBKEY environment variable. In that case /var/lib/concourse/keys/tsa_key.pub is ignored.

docker run --entrypoint concourse-worker.sh \
  --privileged --v /var/lib/concourse/work \
  --env CONCOURSE_WORKER_KEY="<worker's private key>" \
  --env CONCOURSE_TSA_PUBKEY="<public TSA key>" \
  meteogroup/concourse-ci

Run single node concourse web/worker

For your convenience there is a docker-compose.yml file to stand up a ready to use concourse web/worker deployment, no key management involved. Just run

docker-compose up

If concourse web is firewalled or run behind a proxy the external visible URL can be configured by setting the CONCOURSE_URL environment variable.

CONCOURSE_URL=http://192.168.99.100:8080 docker-compose up

Test

To test worker and CI server just run

./test.sh

This will start a busybox docker container, download fly and goes through the following steps:

• create a pipeline using a slightly modified version of the Hello, world! example.
• Unpause the pipeline.
• Trigger the job.
• Wait for the job to complete.
• Delete the pipeline.
• Check the job output against the expected Hello, world! output.

By default the script tries to connect to http://0.0.0.0:8080 using concourse/ci as username/password. That can be changed by setting the CONCOURSE_HOST, CONCOURSE_PORT, CONCOURSE_LOGIN and CONCOURSE_PASSWORD environment variables for the test.sh script.

Be aware that username and password will be echoed in the script output!

If concourse web running behind a proxy and is not reachable at the hosts root path you have to set the CONCOURSE_URL environment variable to the externally reachable URL of concourse web. In that case username and password have to be repeated in the authority part of that URL, otherwise the test script will not be able to download the fly binary.

Connecting to custom host/port:

CONCOURSE_HOST=192.168.99.100 CONCOURSE_PORT=8080 test.sh

Using custom username/password:

CONCOURSE_LOGIN=ci-user CONCOURSE_PASSWORD=rumpelstiltskin test.sh

Connecting to concourse behind a proxy:

CONCOURSE_URL=https://ci-user:rumpelstiltskin@my-ci/concourse \
  CONCOURSE_LOGIN=ci-user CONCOURSE_PASSWORD=rumpelstiltskin test.sh

License

Concourse – Copyright © 2014-2016 Alex Suraci & Chris Brown, licensed under Apache License 2.0

Copyright © 2016 MeteoGroup Deutschland GmbH

Licensed under the Apache License, Version 2.0 (the "License"); you may not use any file from this repository except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.