244 lines
8 KiB
Markdown
244 lines
8 KiB
Markdown
---
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stage: Create
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group: Source Code
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info: "To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments"
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type: reference, howto
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---
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# PlantUML and GitLab **(FREE)**
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When the [PlantUML](https://plantuml.com) integration is enabled and configured in
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GitLab, you can create diagrams in snippets, wikis, and repositories. This integration
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is enabled on GitLab.com for all SaaS users and does not require any additional configuration.
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To set up the integration on a self-managed instance, you must:
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1. [Configure your PlantUML server](#configure-your-plantuml-server).
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1. [Configure local PlantUML access](#configure-local-plantuml-access).
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1. [Configure PlantUML security](#configure-plantuml-security).
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1. [Enable the integration](#enable-plantuml-integration).
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After completing the integration, PlantUML converts `plantuml`
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blocks to an HTML image tag, with the source pointing to the PlantUML instance. The PlantUML
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diagram delimiters `@startuml`/`@enduml` aren't required, as these are replaced
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by the `plantuml` block:
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- **Markdown** files with the extension `.md`:
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````markdown
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```plantuml
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Bob -> Alice : hello
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Alice -> Bob : hi
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```
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````
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For additional acceptable extensions, review the
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[`languages.yaml`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/vendor/languages.yml#L3174) file.
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- **AsciiDoc** files with the extension `.asciidoc`, `.adoc`, or `.asc`:
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```plaintext
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[plantuml, format="png", id="myDiagram", width="200px"]
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----
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Bob->Alice : hello
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Alice -> Bob : hi
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----
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```
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- **reStructuredText**
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```plaintext
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.. plantuml::
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:caption: Caption with **bold** and *italic*
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Bob -> Alice: hello
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Alice -> Bob: hi
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```
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Although you can use the `uml::` directive for compatibility with
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[`sphinxcontrib-plantuml`](https://pypi.org/project/sphinxcontrib-plantuml/),
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GitLab supports only the `caption` option.
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If the PlantUML server is correctly configured, these examples should render a
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diagram instead of the code block:
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```plantuml
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Bob -> Alice : hello
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Alice -> Bob : hi
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```
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Inside the block you can add any of the diagrams PlantUML supports, such as:
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- [Activity](https://plantuml.com/activity-diagram-legacy)
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- [Class](https://plantuml.com/class-diagram)
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- [Component](https://plantuml.com/component-diagram)
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- [Object](https://plantuml.com/object-diagram)
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- [Sequence](https://plantuml.com/sequence-diagram)
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- [State](https://plantuml.com/state-diagram)
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- [Use Case](https://plantuml.com/use-case-diagram)
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You can add parameters to block definitions:
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- `format`: Can be either `png` (default) or `svg`. Use `svg` with care, as it's
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not supported by all browsers, and isn't supported by Markdown.
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- `id`: A CSS ID added to the diagram HTML tag.
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- `width`: Width attribute added to the image tag.
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- `height`: Height attribute added to the image tag.
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Markdown does not support any parameters, and always uses PNG format.
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## Configure your PlantUML server
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Before you can enable PlantUML in GitLab, set up your own PlantUML
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server to generate the diagrams:
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- [In Docker](#docker).
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- [In Debian/Ubuntu](#debianubuntu).
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### Docker
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To run a PlantUML container in Docker, run this command:
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```shell
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docker run -d --name plantuml -p 8080:8080 plantuml/plantuml-server:tomcat
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```
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The **PlantUML URL** is the hostname of the server running the container.
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When running GitLab in Docker, it must have access to the PlantUML container.
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To achieve that, use [Docker Compose](https://docs.docker.com/compose/).
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In this basic `docker-compose.yml` file, PlantUML is accessible to GitLab at the URL
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`http://plantuml:8080/`:
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```yaml
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version: "3"
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services:
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gitlab:
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image: 'gitlab/gitlab-ee:12.2.5-ee.0'
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environment:
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GITLAB_OMNIBUS_CONFIG: |
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nginx['custom_gitlab_server_config'] = "location /-/plantuml/ { \n proxy_cache off; \n proxy_pass http://plantuml:8080/; \n}\n"
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plantuml:
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image: 'plantuml/plantuml-server:tomcat'
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container_name: plantuml
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```
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### Debian/Ubuntu
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You can install and configure a PlantUML server in Debian/Ubuntu distributions
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using Tomcat:
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1. Run these commands to create a `plantuml.war` file from the source code:
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```shell
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sudo apt-get install graphviz openjdk-8-jdk git-core maven
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git clone https://github.com/plantuml/plantuml-server.git
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cd plantuml-server
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mvn package
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```
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1. Deploy the `.war` file from the previous step with these commands:
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```shell
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sudo apt-get install tomcat8
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sudo cp target/plantuml.war /var/lib/tomcat8/webapps/plantuml.war
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sudo chown tomcat8:tomcat8 /var/lib/tomcat8/webapps/plantuml.war
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sudo service tomcat8 restart
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```
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The Tomcat service should restart. After the restart is complete, the
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PlantUML service is ready and listening for requests on port 8080:
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`http://localhost:8080/plantuml`
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To change these defaults, edit the `/etc/tomcat8/server.xml` file.
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NOTE:
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The default URL is different when using this approach. The Docker-based image
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makes the service available at the root URL, with no relative path. Adjust
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the configuration below accordingly.
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## Configure local PlantUML access
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The PlantUML server runs locally on your server, so it can't be accessed
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externally by default. Your server must catch external PlantUML
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calls to `https://gitlab.example.com/-/plantuml/` and redirect them to the
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local PlantUML server. Depending on your setup, the URL is either of the
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following:
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- `http://plantuml:8080/`
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- `http://localhost:8080/plantuml/`
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If you're running [GitLab with TLS](https://docs.gitlab.com/omnibus/settings/ssl.html)
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you must configure this redirection, because PlantUML uses the insecure HTTP protocol.
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Newer browsers such as [Google Chrome 86+](https://www.chromestatus.com/feature/4926989725073408)
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don't load insecure HTTP resources on pages served over HTTPS.
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To enable this redirection:
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1. Add the following line in `/etc/gitlab/gitlab.rb`, depending on your setup method:
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```ruby
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# Docker deployment
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nginx['custom_gitlab_server_config'] = "location /-/plantuml/ { \n proxy_cache off; \n proxy_pass http://plantuml:8080/; \n}\n"
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# Built from source
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nginx['custom_gitlab_server_config'] = "location /-/plantuml { \n rewrite ^/-/(plantuml.*) /$1 break;\n proxy_cache off; \n proxy_pass http://localhost:8080/plantuml; \n}\n"
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```
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1. To activate the changes, run the following command:
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```shell
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sudo gitlab-ctl reconfigure
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```
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### Configure PlantUML security
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PlantUML has features that allow fetching network resources. If you self-host the
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PlantUML server, put network controls in place to isolate it.
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```plaintext
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@startuml
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start
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' ...
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!include http://localhost/
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stop;
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@enduml
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```
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## Enable PlantUML integration
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After configuring your local PlantUML server, you're ready to enable the PlantUML integration:
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1. Sign in to GitLab as an [Administrator](../../user/permissions.md) user.
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1. On the top bar, select **Main menu > Admin**.
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1. On the left sidebar, go to **Settings > General** and expand the **PlantUML** section.
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1. Select the **Enable PlantUML** checkbox.
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1. Set the PlantUML instance as `https://gitlab.example.com/-/plantuml/`,
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and select **Save changes**.
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Depending on your PlantUML and GitLab version numbers, you may also need to take
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these steps:
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- For PlantUML servers running v1.2020.9 and above, such as [plantuml.com](https://plantuml.com),
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you must set the `PLANTUML_ENCODING` environment variable to enable the `deflate`
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compression. In Omnibus GitLab, you can set this value in `/etc/gitlab.rb` with
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this command:
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```ruby
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gitlab_rails['env'] = { 'PLANTUML_ENCODING' => 'deflate' }
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```
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In GitLab Helm chart, you can set it by adding a variable to the
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[global.extraEnv](https://gitlab.com/gitlab-org/charts/gitlab/blob/master/doc/charts/globals.md#extraenv)
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section, like this:
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```yaml
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global:
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extraEnv:
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PLANTUML_ENCODING: deflate
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```
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- For GitLab versions 13.1 and later, PlantUML integration now
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[requires a header prefix in the URL](https://github.com/plantuml/plantuml/issues/117#issuecomment-6235450160)
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to distinguish different encoding types.
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