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Add a note for the DNS settings in docs. (#6372) 

* Add a note for the DNS settings

Reason: a lot of people struggle against problems with the DNS configuration when they try to build their first app.

* Merge DNS and proxy notes
This commit is contained in:
Andrea 2018-04-11 00:10:43 +02:00 committed by Joao Fernandes
parent ebf3cef80c
commit c8d2c04876
1 changed files with 38 additions and 15 deletions
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53
get-started/part2.md
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@ -84,21 +84,6 @@ ENV NAME World
CMD ["python", "app.py"] CMD ["python", "app.py"]
``` ```
> Are you behind a proxy server?
>
> Proxy servers can block connections to your web app once it's up and running.
> If you are behind a proxy server, add the following lines to your
> Dockerfile, using the `ENV` command to specify the host and port for your
> proxy servers:
>
> ```conf
> # Set proxy server, replace host:port with values for your servers
> ENV http_proxy host:port
> ENV https_proxy host:port
> ```
>
> Add these lines before the call to `pip` so that the installation succeeds.
This `Dockerfile` refers to a couple of files we haven't created yet, namely This `Dockerfile` refers to a couple of files we haven't created yet, namely
`app.py` and `requirements.txt`. Let's create those next. `app.py` and `requirements.txt`. Let's create those next.
@ -185,7 +170,45 @@ $ docker image ls
REPOSITORY TAG IMAGE ID REPOSITORY TAG IMAGE ID
friendlyhello latest 326387cea398 friendlyhello latest 326387cea398
``` ```
> Troubleshooting for Linux users
>
> _DNS settings_
>
> Proxy servers can block connections to your web app once it's up and running.
> If you are behind a proxy server, add the following lines to your
> Dockerfile, using the `ENV` command to specify the host and port for your
> proxy servers:
>
> ```conf
> # Set proxy server, replace host:port with values for your servers
> ENV http_proxy host:port
> ENV https_proxy host:port
> ```
>
> _Proxy server settings_
>
> DNS misconfgiurations can generate problems with `pip`. You need to set your
> own DNS server address to make `pip` work properly. You might want
> to change the DNS settings of the Docker daemon. You can edit (or create) the
> configurarion file at `/etc/docker/daemon.json` with the `dns` key, as following:
>
> ```json
>{
> "dns": ["your_dns_address", "8.8.8.8"]
>}
> ```
>
> In the example above, the first element of the list is the address of your DNS
> server. The second item is the Google's DNS which can be used when the first one is
> not available.
>
> Before proceeding, save `daemon.json` and restart the docker service.
>
> `sudo service docker restart`
>
> Once fixed, retry to run the `build` command.
## Run the app ## Run the app