8000 Add Swarm documentation by JeromeGillard · Pull Request #405 · elgalu/docker-selenium · GitHub
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Add Swarm documentation #405

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Add Swarm documentation #405

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36 changes: 36 additions & 0 deletions docs/docker-compose.md
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Expand Up @@ -34,6 +34,42 @@ You can now run your tests by using the `--seleniumUrl="http://localhost:4444/wd
However if your web application under test is running in localhost, e.g. `--appHost=localhost` or is publicly not accessible
you should instead either dockerize your application as shown in the example [adwords_mock](https://github.com/elgalu/google_adwords_mock) within the [docker-compose-tests.yml][]. Its there shown as another [service](https://docs.docker.com/compose/compose-file/#/service-configuration-reference). Another option (if you don't want to dockerize your app yet) is to somehow replace `--appHost=localhost` with `--appHost=d.host.loc.dev` in the config file of your testing framework. The string `d.host.loc.dev` is a place holder inside the docker container that points to the IP of your localhost.

## Docker Swarm mode
You might get the following error if you try to run a `SELENIUM_NODE` as part of a Swarm stack:
```
$ docker stack deploy selenium
Updating service selenium_selenium-chrome (id: joru9fw8xej2imcrvgblcrc85)
failed to create service selenium_selenium-chrome: Error response from daemon: rpc error: code = InvalidArgument desc = expanding env failed: expanding env "SELENIUM_NODE_HOST={{CONTAINER_IP}}": template: expansion:1: function "CONTAINER_IP" not defined
```
Thanks to https://github.com/elgalu/docker-selenium/issues/236 you just have to update your variable `SELENIUM_NODE_HOST` to `{{__CONTAINER_IP__}}`.
Example in a `docker-compose file`:
```
selenium-firefox:
image: elgalu/selenium
depends_on:
- hub
volumes:
- /dev/shm:/dev/shm
deploy:
replicas: 3
environment:
- DEBUG=true
- PICK_ALL_RANDOM_PORTS=true
- SELENIUM_HUB_HOST=hub
- SELENIUM_HUB_PORT=4444
- SELENIUM_NODE_HOST={{__CONTAINER_IP__}}
- SCREEN_WIDTH=1300
- SCREEN_HEIGHT=999
- VIDEO=false
- AUDIO=false
- GRID=false
- CHROME=false
- FIREFOX=true
- MAX_INSTANCES=1
- MAX_SESSIONS=1
```


### Cleanup
Once your tests are done you can clean up:

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