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[GH-ISSUE #15322] issue: WEBUI_BANNERS on docker compose #56197

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opened 2026-05-05 18:56:21 -05:00 by GiteaMirror · 3 comments
GiteaMirror commented 2026-05-05 18:56:21 -05:00
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Originally created by @devbysb on GitHub (Jun 26, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/15322

Check Existing Issues

  • I have searched the existing issues and discussions.
  • I am using the latest version of Open WebUI.

Installation Method

Docker

Open WebUI Version

0.6.15

Ollama Version (if applicable)

No response

Operating System

ubuntu 24.04 (docker)

Browser (if applicable)

No response

Confirmation

  • I have read and followed all instructions in README.md.
  • I am using the latest version of both Open WebUI and Ollama.
  • I have included the browser console logs.
  • I have included the Docker container logs.
  • I have provided every relevant configuration, setting, and environment variable used in my setup.
  • I have clearly listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
  • I have documented step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation. My steps:
  • Start with the initial platform/version/OS and dependencies used,
  • Specify exact install/launch/configure commands,
  • List URLs visited, user input (incl. example values/emails/passwords if needed),
  • Describe all options and toggles enabled or changed,
  • Include any files or environmental changes,
  • Identify the expected and actual result at each stage,
  • Ensure any reasonably skilled user can follow and hit the same issue.

Expected Behavior

No error on docker compose up

Actual Behavior

yaml: line 13: mapping values are not allowed in this context

Steps to Reproduce

Hi I have followed https://docs.openwebui.com/getting-started/env-configuration/#webui_banners
With this docker compose yaml file

services:
  open-webui:
    image: ghcr.io/open-webui/open-webui:main
    container_name: open-webui
    volumes:
      - ./open-webui/data:/app/backend/data
      - /etc/localtime:/etc/localtime:ro
    ports:
      - 3000:8080
    restart: always
    environment:
      - ENABLE_PERSISTENT_CONFIG=false
      - WEBUI_BANNERS="[{\"id\": \"1\", \"type\": \"warning\", \"title\": \"Your messages are stored.\", \"content\": \"Your messages are stored and may be reviewed by human people. LLM's are prone to hallucinations, check sources.\", \"dismissible\": true, \"timestamp\": 1000}]"

I have done docker compose up
And I have this error
yaml: line 13: mapping values are not allowed in this context

Logs & Screenshots

yaml: line 13: mapping values are not allowed in this context

Additional Information

No response

Originally created by @devbysb on GitHub (Jun 26, 2025). Original GitHub issue: https://github.com/open-webui/open-webui/issues/15322 ### Check Existing Issues - [x] I have searched the existing issues and discussions. - [x] I am using the latest version of Open WebUI. ### Installation Method Docker ### Open WebUI Version 0.6.15 ### Ollama Version (if applicable) _No response_ ### Operating System ubuntu 24.04 (docker) ### Browser (if applicable) _No response_ ### Confirmation - [x] I have read and followed all instructions in `README.md`. - [x] I am using the latest version of **both** Open WebUI and Ollama. - [x] I have included the browser console logs. - [x] I have included the Docker container logs. - [x] I have **provided every relevant configuration, setting, and environment variable used in my setup.** - [x] I have clearly **listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup** (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc). - [x] I have documented **step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation**. My steps: - Start with the initial platform/version/OS and dependencies used, - Specify exact install/launch/configure commands, - List URLs visited, user input (incl. example values/emails/passwords if needed), - Describe all options and toggles enabled or changed, - Include any files or environmental changes, - Identify the expected and actual result at each stage, - Ensure any reasonably skilled user can follow and hit the same issue. ### Expected Behavior No error on docker compose up ### Actual Behavior yaml: line 13: mapping values are not allowed in this context ### Steps to Reproduce Hi I have followed https://docs.openwebui.com/getting-started/env-configuration/#webui_banners With this docker compose yaml file ``` services: open-webui: image: ghcr.io/open-webui/open-webui:main container_name: open-webui volumes: - ./open-webui/data:/app/backend/data - /etc/localtime:/etc/localtime:ro ports: - 3000:8080 restart: always environment: - ENABLE_PERSISTENT_CONFIG=false - WEBUI_BANNERS="[{\"id\": \"1\", \"type\": \"warning\", \"title\": \"Your messages are stored.\", \"content\": \"Your messages are stored and may be reviewed by human people. LLM's are prone to hallucinations, check sources.\", \"dismissible\": true, \"timestamp\": 1000}]" ``` I have done docker compose up And I have this error yaml: line 13: mapping values are not allowed in this context ### Logs & Screenshots yaml: line 13: mapping values are not allowed in this context ### Additional Information _No response_
GiteaMirror added the bug label 2026-05-05 18:56:21 -05:00
GiteaMirror commented 2026-05-05 18:56:25 -05:00
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@guenhter commented on GitHub (Jun 26, 2025):

Can you add a properly formatted compose file please.

<!-- gh-comment-id:3008279636 --> @guenhter commented on GitHub (Jun 26, 2025): Can you add a properly formatted compose file please.
GiteaMirror commented 2026-05-05 18:56:26 -05:00
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@devbysb commented on GitHub (Jun 26, 2025):

Sorry bad copy/paste :)

<!-- gh-comment-id:3008706652 --> @devbysb commented on GitHub (Jun 26, 2025): Sorry bad copy/paste :)
GiteaMirror commented 2026-05-05 18:56:26 -05:00
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@guenhter commented on GitHub (Jun 26, 2025):

Try to change it to

- WEBUI_BANNERS=[{"id":"1","type":"warning","title":"Your messages are stored.","content":"Your messages are stored and may be reviewed by human people. LLM's are prone to hallucinations, check sources.","dismissible":true,"timestamp":1000}]

The problem is, that you compose file is not a proper yaml.

<!-- gh-comment-id:3009381370 --> @guenhter commented on GitHub (Jun 26, 2025): Try to change it to ```yaml - WEBUI_BANNERS=[{"id":"1","type":"warning","title":"Your messages are stored.","content":"Your messages are stored and may be reviewed by human people. LLM's are prone to hallucinations, check sources.","dismissible":true,"timestamp":1000}] ``` The problem is, that you compose file is not a proper yaml.
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Reference: github-starred/open-webui#56197
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