176 lines
4.9 KiB
Markdown
176 lines
4.9 KiB
Markdown
---
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stage: Create
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group: Ecosystem
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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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---
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# Kroki diagrams **(FREE SELF)**
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> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/241744) in GitLab 13.7.
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When [Kroki](https://kroki.io) integration is enabled and configured in
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GitLab you can use it to create diagrams in AsciiDoc and Markdown documents.
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## Kroki Server
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When Kroki is enabled, GitLab sends diagrams to an instance of Kroki to display them as images.
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You can use the free public cloud instance `https://kroki.io` or you can [install Kroki](https://docs.kroki.io/kroki/setup/install/)
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on your own infrastructure.
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After you've installed Kroki, make sure to update the server URL to point to your instance.
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### Docker
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With Docker, run a container like this:
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```shell
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docker run -d --name kroki -p 8080:8000 yuzutech/kroki
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```
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The **Kroki URL** is the hostname of the server running the container.
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The [`yuzutech/kroki`](https://hub.docker.com/r/yuzutech/kroki) image contains the following diagrams libraries out-of-the-box:
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<!-- vale gitlab.Spelling = NO -->
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- [Bytefield](https://bytefield-svg.deepsymmetry.org/)
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- [Ditaa](http://ditaa.sourceforge.net)
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- [Erd](https://github.com/BurntSushi/erd)
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- [GraphViz](https://www.graphviz.org/)
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- [Nomnoml](https://github.com/skanaar/nomnoml)
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- [PlantUML](https://github.com/plantuml/plantuml)
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- [C4 model](https://github.com/RicardoNiepel/C4-PlantUML) (with PlantUML)
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- [Svgbob](https://github.com/ivanceras/svgbob)
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- [UMlet](https://github.com/umlet/umlet)
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- [Vega](https://github.com/vega/vega)
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- [Vega-Lite](https://github.com/vega/vega-lite)
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- [WaveDrom](https://wavedrom.com/)
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<!-- vale gitlab.Spelling = YES -->
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If you want to use additional diagram libraries,
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read the [Kroki installation](https://docs.kroki.io/kroki/setup/install/#_images) to learn how to start Kroki companion containers.
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## Enable Kroki in GitLab
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You need to enable Kroki integration from Settings under Admin Area.
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To do that, log in with an administrator account and follow these steps:
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1. Select the Admin Area (**{admin}**) icon.
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1. Go to **Settings > General**.
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1. Expand the **Kroki** section.
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1. Select **Enable Kroki** checkbox.
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1. Enter the **Kroki URL**.
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## Create diagrams
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With Kroki integration enabled and configured, you can start adding diagrams to
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your AsciiDoc or Markdown documentation using delimited blocks:
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- **Markdown**
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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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- **AsciiDoc**
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```plaintext
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[plantuml]
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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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The above blocks are converted to an HTML image tag with source pointing to the
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Kroki instance. If the Kroki server is correctly configured, this should
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render a nice diagram instead of the block:
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Kroki supports more than a dozen diagram libraries. Here's a few examples:
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**GraphViz**
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```plaintext
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[graphviz]
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....
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digraph finite_state_machine {
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rankdir=LR;
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node [shape = doublecircle]; LR_0 LR_3 LR_4 LR_8;
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node [shape = circle];
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LR_0 -> LR_2 [ label = "SS(B)" ];
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LR_0 -> LR_1 [ label = "SS(S)" ];
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LR_1 -> LR_3 [ label = "S($end)" ];
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LR_2 -> LR_6 [ label = "SS(b)" ];
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LR_2 -> LR_5 [ label = "SS(a)" ];
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LR_2 -> LR_4 [ label = "S(A)" ];
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LR_5 -> LR_7 [ label = "S(b)" ];
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LR_5 -> LR_5 [ label = "S(a)" ];
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LR_6 -> LR_6 [ label = "S(b)" ];
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LR_6 -> LR_5 [ label = "S(a)" ];
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LR_7 -> LR_8 [ label = "S(b)" ];
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LR_7 -> LR_5 [ label = "S(a)" ];
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LR_8 -> LR_6 [ label = "S(b)" ];
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LR_8 -> LR_5 [ label = "S(a)" ];
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}
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....
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```
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**C4 (based on PlantUML)**
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```plaintext
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[c4plantuml]
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....
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@startuml
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!include C4_Context.puml
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title System Context diagram for Internet Banking System
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Person(customer, "Banking Customer", "A customer of the bank, with personal bank accounts.")
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System(banking_system, "Internet Banking System", "Allows customers to check their accounts.")
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System_Ext(mail_system, "E-mail system", "The internal Microsoft Exchange e-mail system.")
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System_Ext(mainframe, "Mainframe Banking System", "Stores all of the core banking information.")
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Rel(customer, banking_system, "Uses")
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Rel_Back(customer, mail_system, "Sends e-mails to")
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Rel_Neighbor(banking_system, mail_system, "Sends e-mails", "SMTP")
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Rel(banking_system, mainframe, "Uses")
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@enduml
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....
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```
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<!-- vale gitlab.Spelling = NO -->
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**Nomnoml**
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<!-- vale gitlab.Spelling = YES -->
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```plaintext
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[nomnoml]
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....
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[Pirate|eyeCount: Int|raid();pillage()|
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[beard]--[parrot]
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[beard]-:>[foul mouth]
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]
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[<abstract>Marauder]<:--[Pirate]
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[Pirate]- 0..7[mischief]
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[jollyness]->[Pirate]
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[jollyness]->[rum]
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[jollyness]->[singing]
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[Pirate]-> *[rum|tastiness: Int|swig()]
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[Pirate]->[singing]
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[singing]<->[rum]
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....
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```
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