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Last pushed: a month ago
Short Description
UI for Confluent's Schema Registry
Full Description

Schema Registry UI

This is a small docker image for Landoop's schema-registry-ui.
It serves the schema-registry-ui from port 8000 by default.
A live version can be found at

The software is stateless and the only necessary option is your Schema Registry

To run it:

docker run --rm -p 8000:8000 \
           -e "SCHEMAREGISTRY_URL=http://schema.registry.url" \

Visit http://localhost:8000 to see the UI.

Advanced Settings

Three of the Schema Registry UI settings need to be enabled explicitly. These

  1. Support for global compatibility level configuration support —i.e change the
    default compatibility level of your schema registry.
  2. Support for transitive compatibility levels (Schema Registry version 3.1.1 or better).
  3. Support for Schema deletion (Schema Registry version 3.3.0 or better).

environment variables. E.g:

docker run --rm -p 8000:8000 \
           -e "SCHEMAREGISTRY_URL=http://schema.registry.url" \
           -e ALLOW_GLOBAL=1 \
           -e ALLOW_TRANSITIVE=1 \
           -e ALLOW_DELETION=1 \

Proxying Schema Registry

If you have CORS issues or want to pass through firewalls and maybe share your
server, we added the PROXY option. Run the container with -e PROXY=true and
Caddy server will proxy the traffic to Schema Registry:

docker run --rm -p 8000:8000 \
           -e "SCHEMAREGISTRY_URL=http://schema.registry.url" \
           -e "PROXY=true" \

Important: When proxying, for the SCHEMAREGISTRY_URL you have to use an
IP address or a domain that can be resolved to it. You can't use
localhost even if you serve Schema Registry from your localhost. The reason
for this is that a docker container has its own network, so your localhost
is different from the container's localhost. As an example, if you are in
your home network and have an IP address of and run Schema
Registry from your computer, instead of http://127.0.1:8082 you must use

If your Schema Registry uses self-signed SSL certificates, you can use the
PROXY_SKIP_VERIFY=true environment variable to instruct the proxy to
not verify the backend TLS certificate.

Configuration options

Schema Registry UI

You can control most of Kafka Topics UI settings via environment variables:

  • ALLOW_GLOBAL=[true|false] (default false)
  • ALLOW_TRANSITIVE=[true|false] (default false)
  • ALLOW_DELETION=[true|false] (default false).

Docker Options

  • PROXY=[true|false]

    Whether to proxy Schema Registry endpoint via the internal webserver

  • PROXY_SKIP_VERIFY=[true|false]

    Whether to accept self-signed certificates when proxying Schema Registry
    via https


    The port number to use for schema-registry-ui. The default is 8000.
    Usually the main reason for using this is when you run the
    container with --net=host, where you can't use docker's publish
    flag (-p HOST_PORT:8000).


    The webserver that powers the image is Caddy. Via this variable
    you can add options that will be appended to its configuration
    (Caddyfile). Variables than span multiple lines are supported.

    As an example, you can set Caddy to not apply timeouts via:

    -e "CADDY_OPTIONS=timeouts none"

    Or you can set basic authentication via:

    -e "CADDY_OPTIONS=basicauth / [USER] [PASS]"
  • RELATIVE_PROXY_URL=[true|false]

    When proxying Schema Registry, enabling this option will set the Schema
    Registry endpoint in the UI as a relative URL. This can help when running
    Schema Registry UI under a subpath of your server (e.g
    http://url:8000/sr-ui instead of http://url:8000/).

Schema Registry Configuration

If you don't wish to proxy Schema Registry's api, you should permit CORS via setting
access.control.allow.methods=GET,POST,PUT,DELETE,OPTIONS and


In the latest iterations, the container will print informational messages during
startup at stderr and web server logs at stdout. This way you may sent the logs
(stdout) to your favorite log management solution.

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