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doc: how to use podman 

how to use podman

Signed-off-by: Matej Vasek <mvasek@redhat.com>

Co-authored-by: Lance Ball <lball@redhat.com>
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docs/guides/developers_tutorial.md
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@ -10,7 +10,7 @@ installed.
* [oc][oc] or [kubectl][kubectl] CLI
* [kn][kn] CLI
* [Docker][docker]
* [Docker][docker] or [Podman](podman.md)
[docker]: https://docs.docker.com/install/
[oc]: https://docs.openshift.com/container-platform/4.6/cli_reference/openshift_cli/getting-started-cli.html#cli-installing-cli_cli-developer-commands

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docs/guides/podman.md Normal file
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# Podman
Under Linux, it is possible to use [podman](https://podman.io/) instead of [docker](https://www.docker.com/).
In order to do this you need to run `podman` as a service. You can do this with the following command.
```
❯ podman system service --time=0
```
This will serve the Docker API on a UNIX socket at `/run/user/{uid}/podman/podman.sock`.
Then set the environment variable `DOCKER_HOST` to the socket so `func` knows where to connect.
```
❯ export DOCKER_HOST="unix:///run/user/$(id -u)/podman/podman.sock"
❯ func build -v
```
Now you may use `func` as usual.