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docs(README): added note to specify a docker version #7

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18 changes: 18 additions & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,24 @@ services:
- "./hetzner_config:/etc/gitlab-runner"
```

### Docker Errors

If you face docker problems at runtime (such as the one below), you can specify a Docker version in the `MachineOptions`.

```toml
MachineOptions = [
"engine-install-url=https://releases.rancher.com/install-docker/19.03.9.sh",
]
```

Possible error that is caused by Docker:

```bash
ERROR: Error creating machine: Error running provisioning: Unable to verify the Docker daemon is listening: Maximum number of retries (10) exceeded driver=hetzner name=runner-xxx-xxx operation=create
```

See [this issue](https://github.com/docker/machine/issues/4858) for more information.

## Versions

Currently this image is build using the `gitlab/gitlab-runner:latest` image and the latest docker-machine hetzner plugin. If you need builds for another version feel free to open an PR.
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