# Podman Compose
## [![Tests](https://github.com/containers/podman-compose/actions/workflows/test.yml/badge.svg)](https://github.com/containers/podman-compose/actions/workflows/test.yml)

An implementation of [Compose Spec](https://compose-spec.io/) with [Podman](https://podman.io/) backend.
This project focuses on:

* rootless
* daemon-less process model, we directly execute podman, no running daemon.

This project only depends on:

* `podman`
* a podman network backend with DNS name resolution available. This allows containers to be able to resolve each other if they are on the same network.
  * either: [podman dnsname plugin](https://github.com/containers/dnsname) with CNI network backend: It is usually found in the `podman-plugins` or `podman-dnsname` distro packages, those packages are not pulled by default and you need to install them.
  * or: [netavark](https://github.com/containers/netavark)/[aardvark-dns](https://github.com/containers/aardvark-dns): Both are usually installed on new installations of podman 4.
* Python 3.9 or newer
* [PyYAML](https://pyyaml.org/)
* [python-dotenv](https://pypi.org/project/python-dotenv/)

And it's formed as a single Python file script that you can drop into your PATH and run.

## References:

* [spec.md](https://github.com/compose-spec/compose-spec/blob/master/spec.md)
* [docker-compose compose-file-v3](https://docs.docker.com/compose/compose-file/compose-file-v3/)
* [docker-compose compose-file-v2](https://docs.docker.com/compose/compose-file/compose-file-v2/)

## Alternatives

As in [this article](https://fedoramagazine.org/use-docker-compose-with-podman-to-orchestrate-containers-on-fedora/) you can setup a `podman.socket` and use unmodified `docker-compose` that talks to that socket but in this case you lose the process-model (ex. `docker-compose build` will send a possibly large context tarball to the daemon)

For production-like single-machine containerized environment consider

- [k3s](https://k3s.io) | [k3s github](https://github.com/rancher/k3s)
- [MiniKube](https://minikube.sigs.k8s.io/)

For the real thing (multi-node clusters) check any production
OpenShift/Kubernetes distribution like [OKD](https://www.okd.io/).

## Versions

If you have legacy version of `podman` (before 3.1.0) you might need to stick with legacy `podman-compose` `0.1.x` branch.
The legacy branch 0.1.x uses mappings and workarounds to compensate for rootless limitations.

Modern podman versions (>=3.4) do not have those limitations, and thus you can use latest and stable 1.x branch.

If you are upgrading from `podman-compose` version `0.1.x` then we no longer have global option `-t` to set mapping type
like `hostnet`. If you desire that behavior, pass it the standard way like `network_mode: host` in the YAML.


## Installation

### Pip

Install the latest stable version from PyPI:

```bash
pip3 install podman-compose
```

pass `--user` to install inside a regular user's home without being root.

Or latest development version from GitHub:

```bash
pip3 install https://github.com/containers/podman-compose/archive/main.tar.gz
```

### Package repositories

podman-compose is available from the following package repositories:

Debian:

```bash
sudo apt install podman-compose
```

Fedora (starting from f31) repositories:

```bash
sudo dnf install podman-compose
```

Homebrew:

```bash
brew install podman-compose
```

### Generate binary using docker/podman locally
This script will download the repo, generate the binary using [this Dockerfile](https://github.com/containers/podman-compose/blob/main/Dockerfile), and place the binary in the directory where you called this script.
```bash
sh -c "$(curl -sSL https://raw.githubusercontent.com/containers/podman-compose/main/scripts/download_and_build_podman-compose.sh)"
```

### Manual

```bash
curl -o /usr/local/bin/podman-compose https://raw.githubusercontent.com/containers/podman-compose/main/podman_compose.py
chmod +x /usr/local/bin/podman-compose
```

or inside your home

```bash
curl -o ~/.local/bin/podman-compose https://raw.githubusercontent.com/containers/podman-compose/main/podman_compose.py
chmod +x ~/.local/bin/podman-compose
```

## Tests

podman-compose is tested via unit and integration tests.

Unit tests can be run via the following:

```shell
python3 -m unittest discover tests/unit
```

Integration tests can be run via the following:

```shell
python3 -m unittest discover tests/integration
```

# Contributing guide

If you are a user or a developer and want to contribute please check the [CONTRIBUTING](CONTRIBUTING.md) section