concourse-in-a-box

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concourse-in-a-box

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All-in-one Concourse CI/CD system based on Docker Compose, with Minio S3-compatible storage and HashiCorp Vault secret manager.

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# concourse-in-a-box

All-in-one [Concourse] CI/CD system based on Docker Compose, with Minio S3-compatible storage and HashiCorp Vault secret manager. This enables to:

1. Learn Concourse pipelines from scratch in a simple environment.
2. Troubleshoot production Concourse pipelines in a stand-alone environment.
3. Write Concourse pipelines that can be reused as-is in your production environment, since it comes with S3 and secret store.

# Security considerations

This project is NOT adapted for production or networked use.

Among other non-production ready settings, it contains hard-coded secrets, stored in the git repo. For production use, all secrets must be regenerated and must not be stored in the git repo!

# What's in the box

* [Concourse] v8.2.1 (ATC and web UI)
* Concourse worker (platform: Linux)
* [PostgreSQL] v18.3 (needed by Concourse web)
* [Minio] latest stable S3-compatible object storage. With this, you can learn writing real-world Concourse pipelines using the [concourse-s3-resource] without the need of setting up an AWS S3 (or any other cloud provider) account.
* [HashiCorp Vault] v1.13.1 secret and credential manager. With this, you can learn writing real-world Concourse pipelines following security and operations best practices. See also [Concourse credential management] for how Concourse uses Vault.
* the incomplete [Concourse primer](doc/concourse-primer.md) tutorial.

# Alternative to Docker: Colima

This is especially useful for macOS. See https://github.com/abiosoft/colima for details.

Short version:

brew install colima
    brew install lima-additional-guestagents
    brew install docker         <== the client only
    brew install docker-buildx  <== "docker build" is deprecated
    brew install docker-compose

Start Colima with defaults, keep it in foreground:

colima start --foreground --memory 8 --cpu 4

It will take a while the first time. When it prints

keeping Colima in the foreground, press ctrl+c to exit...

You are ready to go. In another terminal, verify that the colima context is the default for docker:

docker context list | grep colima
    colima * colima unix:///$HOME/.colima/default/docker.sock

If there is no `*` in the output above, set the default context:

docker context use colima

Now you are ready to use the `docker` and `docker compose` CLI tools and can follow the rest of the instructions.

# Usage

The various credentials (secrets) are in file [env](./.env) and can be changed if you wish. They will be read automatically by `docker compose`.

## Common setup and teardown

### Setup

* Download the images:

$ docker compose pull

* Start the containers:

$ docker compose up

### Verify setup

The docker-compose file uses some short-lived containers to perform initialization. Given the amount of log output from `docker compose up`, failures can be hard to notice.

Run `docker compose ps` and confirm that the containers ending with `-setup` have exited with a `0` state. If any of them exited with a different code, then look back at the logs from `docker compose up` and identify the problem.

For example:

$ docker compose ps -a | grep setup
    concourse-in-a-box_minio-setup_1   /scripts/minio-setup.sh          Exit 1
    concourse-in-a-box_vault-setup_1   /scripts/vault-setup.sh          Exit 0

The minio setup failed.

To troubleshoot the health checks, you can use for example

docker inspect concourse-in-a-box-web-1 | jq -r ".[] | .State.Health"

### Teardown

* When done, remember to stop the containers:

$ docker compose stop

* If you want to also delete the persistent volumes, in order to delete the Concourse build history and the contents of the Minio S3 buckets:

$ docker compose down --rmi local -v

## Concourse setup

* Point your web browser to http://localhost:8080 and follow the instructions there:
  * Download the `fly` command-line tool and put it in your $PATH.
  * Login to the web interface.
* If on macOS, declare that fly is safe to use also if not signed or notarized:

xattr -d com.apple.quarantine ~/bin/fly

* In another terminal, login with `fly` (will open the web browser to finish authentication):

$ fly --target=main login --concourse-url=http://localhost:8080 --open-browser

* You can use anything as the value for `--target`, it is an alias for the connection to the given Concourse with the given credentials (see file `$HOME/.flyrc`).

## Minio S3 setup

* The `minio-setup` container creates a bucket named `concourse`.
* Optional: point your browser to http://localhost:9000 and login.
* Optional: follow [mc documentation] and install the command-line client `mc`.
* If you want to create additional buckets, you can add to [scripts/minio-setup.sh](scripts/minio-setup.sh).

## Vault setup

* For the time being vault is configured in dev mode, which means that the storage backend is in memory and will not be persisted to disk.
* The `vault-setup` container adds the S3 secrets to vault.
* Optional: point your browser to http://localhost:8200 and login.
* Optional: follow [vault download], install the command-line utility `vault` and login.
* If you want to create more secrets, see [scripts/vault-setup.sh](scripts/vault-setup.sh).

# Concourse primer

Have a look at [Concourse incomplete primer](./doc/concourse-primer.md).

# Known issues

* The scheduling of Concourse 7.x is slow, it takes 5-10 seconds to decide what to do next. There are various open tickets about this behavior.
* The same slowness is visible with 8.x. I think it might be a configuration problem, although I am using a docker-compose.yml very similar to upstream, according to the error messages I see from the worker. Need some time to investigate.

# History and credits

This project builds upon what I learned in my previous approach, VM-based: [concourse-ci-formula](https://github.com/marco-m/concourse-ci-formula).

This project is just an humble collection of great open source software.

# License

[MIT](LICENSE).

[concourse]: https://concourse-ci.org/
[concourse credential management]: https://concourse-ci.org/creds.html
[concourse-s3-resource]: https://github.com/concourse/s3-resource/
[minio]: https://min.io/
[mc documentation]: https://docs.min.io/minio/baremetal/reference/minio-cli/minio-mc.html
[HashiCorp Vault]: https://www.hashicorp.com/products/vault
[vault download]: https://www.vaultproject.io/downloads
[PostgreSQL]: https://www.postgresql.org/

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