traefik/docs/content/contributing/documentation.md

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# Documentation
Features Are Better When You Know How to Use Them
{: .subtitle }
You've found something unclear in the documentation and want to give a try at explaining it better?
Let's see how.
## Building Documentation
### General
This [documentation](http://docs.traefik.io/) is built with [mkdocs](http://mkdocs.org/).
### Method 1: `Docker` and `make`
You can build the documentation and test it locally (with live reloading), using the `docs` target:
```bash
$ make docs
docker build -t traefik-docs -f docs.Dockerfile .
# […]
docker run --rm -v /home/user/go/github/containous/traefik:/mkdocs -p 8000:8000 traefik-docs mkdocs serve
# […]
[I 170828 20:47:48 server:283] Serving on http://0.0.0.0:8000
[I 170828 20:47:48 handlers:60] Start watching changes
[I 170828 20:47:48 handlers:62] Start detecting changes
```
!!! tip "Default URL"
Your local documentation server will run by default on [http://127.0.0.1:8000](http://127.0.0.1:8000).
If you only want to build the documentation without serving it locally, you can use the following command:
```bash
$ make docs-build
...
```
### Method 2: `mkdocs`
First, make sure you have `python` and `pip` installed.
```bash
$ python --version
Python 2.7.2
$ pip --version
pip 1.5.2
```
Then, install mkdocs with `pip`.
```bash
pip install --user -r requirements.txt
```
To build the documentation locally and serve it locally, run `mkdocs serve` from the root directory.
This will start a local server.
```bash
$ mkdocs serve
INFO - Building documentation...
INFO - Cleaning site directory
[I 160505 22:31:24 server:281] Serving on http://127.0.0.1:8000
[I 160505 22:31:24 handlers:59] Start watching changes
[I 160505 22:31:24 handlers:61] Start detecting changes
```
### Check the Documentation
To check that the documentation meets standard expectations (no dead links, html markup validity, ...), use the `docs-verify` target.
```bash
$ make docs-verify
docker build -t traefik-docs-verify ./script/docs-verify-docker-image ## Build Validator image
...
docker run --rm -v /home/travis/build/containous/traefik:/app traefik-docs-verify ## Check for dead links and w3c compliance
=== Checking HTML content...
Running ["HtmlCheck", "ImageCheck", "ScriptCheck", "LinkCheck"] on /app/site/basics/index.html on *.html...
```
!!! note "Clean & Verify"
If you've made changes to the documentation, it's safter to clean it before verifying it.
```bash
$ make docs-clean docs-verify
...
```
!!! note "Disabling Documentation Verification"
Verification can be disabled by setting the environment variable `DOCS_VERIFY_SKIP` to `true`:
```shell
DOCS_VERIFY_SKIP=true make docs-verify
...
DOCS_LINT_SKIP is true: no linting done.
```