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docs: add kosa8 to supported Docker environments #1134

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docs: add kosa8 to supported Docker environments
drvt69talati Oct 15, 2026
0909970
docs: update kosa8 section for kosa8 v0.9.10
drvt69talati Oct 15, 2026
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20 changes: 20 additions & 0 deletions docs/system_requirements/docker.md
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Expand Up @@ -49,3 +49,23 @@ DockerCompose(".", docker_command_path="podman")
```

Note that Podman does not support host port ranges (`published: "5000-5999"`) in compose files.

## kosa8

[kosa8](https://kosa8.com) runs containers inside a local microVM and serves a Docker-compatible API on a Unix socket. Start the daemon, point `DOCKER_HOST` at the socket and disable Ryuk:

```bash
kosa8 daemon start
export DOCKER_HOST="unix://${HOME}/.kosa8/run/kosa8.sock"
export TESTCONTAINERS_RYUK_DISABLED=true
```

Ryuk has to be disabled because it bind-mounts the Docker socket, and kosa8 never shares its API socket with a container (the error message says so). Without Ryuk, containers are still removed when `stop()` runs (for example at the end of a `with` block), but a test process that crashes can leave them running; `docker rm -f` cleans them up.

Tested with kosa8 v0.9.10 on macOS (arm64): `RedisContainer`, `PostgresContainer` and `KafkaContainer` pass.

Known limitations:

- Ryuk is not supported (see above); keep `TESTCONTAINERS_RYUK_DISABLED=true`.
- Bind mounts (`with_volume_mapping`) work only for host directories allowed when starting the daemon, for example `kosa8 daemon start --allow-mount /path/to/dir` (read-only) or `--allow-mount /path/to/dir:rw`.
- On Apple silicon, images published only for `linux/amd64` do not run.