Docker Registry User Interface

Overview

This project aims to provide a simple and complete user interface for your private docker registry. You can customize the interface with various options. The major option is SINGLE_REGISTRY which allows you to disable the dynamic selection of docker registeries (same behavior as the old static tag).

You may need the migration guide from 1.x to 2.x or the 1.x readme

This web user interface uses Riot the react-like user interface micro-library and riot-mui components.

If you like my work and want to support it, don't hesitate to sponsor me.

Supported Docker tags

• latest: image with the latest release of Docker Registry UI based on nginx:alpine
• latest-debian: image with the latest release of Docker Registry UI based on nginx:debian
• main, master: image with the beta version of Docker Registry UI based on nginx:alpine
• main-debian, master-debian: image with the beta version of Docker Registry UI based on nginx:debian
• 2: image with the latest release of Docker Registry UI v2 (includes latest minor and patch version)
• 2.x: image with the latest release of Docker Registry UI v2.x (includes latest patch version)
• 2.x.y: image with the specific release of Docker Registry UI v2.x.y

Project Page, Live Demo, Examples, Helm Chart

Hidden Features

• Many ways to delete multiple images at once
  • Select multiple tags to delete with checkboxes (see #29 and #79). Since 1.2.0
  • Select all tags of the page with ALT + Click on the indeterminate checkbox (see #80 and #81). Since 1.2.1
  • Select all contigous tags between two tags with Shift + Click on the first tag then Shift + Click on the second tag (see #287). Since 2.4.0
• Show sha256 for specific tag (hover image tag).
• Sort the tag list with number compatibility (see #45 and #46). Since 0.4.0
• Share your docker registry UI without installation or when you are deploying a UI with SINGLE_REGISTRY=false.
  • Use the public demo and the query parameter url (e.g. https://joxit.dev/docker-registry-ui/demo?url=https://registry.example.com). If you need credentials on your private registry, you must set the Access-Control-Allow-Origin to https://joxit.dev.
  • You can use a single interface with many registry, add them in the menu in the top right of the page.
• Filter images and tags with the search bar.
  • You can select the search bar with the shortcut CRTL + F or F3. When the search bar is already focused, the shortcut will fallback to the default behavior (see #213). Since 2.1.0
• Multi arch support in history page (see #130 and #134). Since 1.5.0
• Show the content of the dockerfile (see #286). Since 2.4.0
• The UI will cache requests from your registry, such as blobs and some manifests (URL with sha256:).

Checkout all options in Available options section.

FAQ

• What is the difference between SINGLE_REGISTRY=false and SINGLE_REGISTRY=true options ?
  • When SINGLE_REGISTRY is set to false, a menu appears on the interface allowing you to dynamically change docker registry URLs.
• Why, when I delete all tags of an image, the image is still in the UI ?
  • This is a limitation of docker registry, the garbage collector don't remove empty images. If you want to delete dangling images, you will need to delete the folder in your registry data. (see #77)
• Why the image size in the UI is not the same as displayed during docker images ?
  • The UI displays the compressed size of the image and not the extracted size version.
• Can I use HTTPS on the UI ?
  • Yes, put your favourite reverse proxy on the front of the UI. Your reverse proxy will take care of HTTPS connection.
• Does the UI support authentication ?
  • Yes, but it supports only basic auth. It's a simple standalone frontend, it will use your browser window for authentication.
• Can I use the UI and docker client with an insecure registry (registry url without https) ?
  • Yes you can, you must first configure your docker client. (see #76)
• What does Mixed Content error mean ?
  • This means you are using a UI with HTTPS and your registry is using HTTP (unsecured). When you are on a HTTPS site, you can't get HTTP content. Upgrade you registry with a HTTPS connection.
• Why the default nginx Host is set to $http_host ?
  • This fixes the issue #88. More about this in #113.
• Why OPTIONS (aka preflight requests) and DELETE fails with 401 status code (using Basic Auth) ?
  • This is caused by a bug in docker registry, it returns 401 status requests on preflight requests, this breaks W3C preflight-request specification. I suggest to have your UI on the same domain than your registry e.g. registry.example.com/ui/ or use NGINX_PROXY_PASS_URL or configure a nginx/apache/haproxy in front of your registry that returns 200 on each OPTIONS requests. (see #104, #204, #207, #214, #266).
• Can I use the docker registry ui as a standalone application (with Electron) ?
  • Yes, check out the example here. (see #129)
• I deleted images through the UI, but they are still present on the server. How can I delete them?
  • When you delete an image with the UI, only the reference is deleted and not the content. To remove dangling images, you need to run the garbage collector of the registry with the command registry garbage-collect config.yml or docker exec registry registry garbage-collect config.yml. (see #77 #147)
• Why when I delete one tag, all tags with the same SHA are deleted ?
  • This a docker registry API limitation, there is only one way to delete images with tag, it's by its name and its manifest (it's a sha of the content). So when you delete a tag, this will delete all tags of this image with the same SHA/manifest.
• Can I run the container with an unprivileged user ?
  • Yes you can run the container with the nginx user with the option --user nginx, this will also update the listen port to 8080 (see #224 and #234).
• Can I use the UI with a docker hub mirror and show library/* images ?
  • Yes but it is at your own risk using two regstry servers, check the comment #155.
• How to fix CORS issue on s3 bucket ?
  • You should add a CORS Policy on your bucket, check the issue #193.
• Why my docker registry server is returning an error pagination number invalid ?
  • Since docker registry server 2.8.2 there is default limit of 1000 images in catalog. If you need more images update the configuration REGISTRY_CATALOG_MAXENTRIES with your max value and check the issue #306.
• I'm using NGINX_PROXY_PASS_URL, my registry server has been recreated and the UI cannot connect with the message [error] 176#176: *2 connect() failed (111: Connection refused) while connecting to upstream, what can I do?
  • Nginx get the IP of all addresses only once at runtime, since your container has been recreated, its IP changed too. To prevent this kind of issue, you may use the option NGINX_RESOLVER and set to 127.0.0.11.

Need more informations ? Try my examples or open an issue.

Available options

You can run the container with the unprivileged user nginx, see the discussion #224.

Some env options are available for use this interface for only one server (when SINGLE_REGISTRY=true).

• REGISTRY_URL: The default url of your docker registry. You may need CORS configuration on your registry. This is usually the domain name or IP of your registry reachable by your computer (e.g http://registry.example.com). (default: derived from the hostname of your UI).
• REGISTRY_TITLE: Set a custom title for your user interface. (default: value derived from REGISTRY_URL) (see #28 and #32). Since 0.3.4
• PULL_URL: Set a custom url when you copy the docker pull command (see #71). (default: value derived from REGISTRY_URL). Since 1.1.0
• DELETE_IMAGES: Set if we can delete images from the UI. (default: false)
• SHOW_CONTENT_DIGEST: Show/Hide content digest in docker tag list (see #126 and #131). (default: false). Since 1.4.9
• CATALOG_ELEMENTS_LIMIT: Limit the number of elements in the catalog page (see #39, #127, #132) and #306. (default: 1000). Since 1.4.9
• SINGLE_REGISTRY: Remove the menu that show the dialogs to add, remove and change the endpoint of your docker registry. (default: false). Since 2.0.0
• NGINX_PROXY_PASS_URL: Update the default Nginx configuration and set the proxy_pass to your backend docker registry (this avoid CORS configuration). This is usually the name of your registry container in the form http://registry:5000. Since 2.0.0
• NGINX_PROXY_HEADER_*: Update the default Nginx configuration and set custom headers for your backend docker registry via environment variable and file (/etc/nginx/.env). Only when NGINX_PROXY_PASS_URL is used (see #89). Since 1.2.3
• NGINX_PROXY_PASS_HEADER_*: Update the default Nginx configuration and forward custom headers to your backend docker registry via environment variable and file (/etc/nginx/.env). Only when NGINX_PROXY_PASS_URL is used (see #206). Since 2.1.0
• NGINX_LISTEN_PORT: Listen on a port other than 80, you can also change the default user and set to nginx --user nginx (see #224 and #234). (default: 80 when the user is root, 8080 otherwise). Since 2.2.0
• NGINX_RESOLVER: Add resolver directive to the nginx configuration for dynamic dns resolving. The value when you are using a docker network is 127.0.0.11, you can set a custom DNS server too with a valid time. This is not needed when you are using kubernetes. (see #333 and #339). (default: ``). Since 2.5.5
• DEFAULT_REGISTRIES: List of comma separated registry URLs (e.g http://registry.example.com,http://registry:5000), available only when SINGLE_REGISTRY=false (see #219). (default: ). Since 2.1.0
• READ_ONLY_REGISTRIES: Deactivate dialog for remove and add new registries, available only when SINGLE_REGISTRY=false (see #219). (default: false). Since 2.1.0
• SHOW_CATALOG_NB_TAGS: Show number of tags per images on catalog page and hide images with 0 tags. This will produce + nb images requests, not recommended on large registries (see #161 and #239). (default: false). Since 2.2.0
• HISTORY_CUSTOM_LABELS: Expose custom labels in history page, custom labels will be processed like maintainer label (see #160 and #240). Since 2.2.0
• USE_CONTROL_CACHE_HEADER: Use Control-Cache header and set to no-store, no-cache. This will avoid some issues on multi-arch images (see #260 and #265). This option requires registry configuration: Access-Control-Allow-Headers with Cache-Control. (default: false). Since 2.3.0
• THEME: Chose your default theme, could be dark, light or auto (see #283). When auto is selected, you will have a switch to manually change from light to dark and vice-versa (see #291). (default: auto). Since 2.4.0
• THEME_*: See table in Theme options section (see #283). Since 2.4.0
• TAGLIST_ORDER: Set the default order for the taglist page, could be num-asc;alpha-asc, num-desc;alpha-asc, num-asc;alpha-desc, num-desc;alpha-desc, alpha-asc;num-asc, alpha-asc;num-desc, alpha-desc;num-asc or alpha-desc;num-desc (see #307). (default: alpha-asc;num-desc). Since 2.5.0
• CATALOG_DEFAULT_EXPANDED: Expand by default all repositories in catalog (see #302). (default: false). Since 2.5.0
• CATALOG_MIN_BRANCHES: Set the minimum repository/namespace to expand (e.g. joxit/docker-registry-ui joxit/ is the repository/namespace). Can be 0 to disable branching. (see #319). (default: 1). Since 2.5.0
• CATALOG_MAX_BRANCHES: Set the maximum repository/namespace to expand (e.g. joxit/docker-registry-ui joxit/ is the repository/namespace). Can be 0 to disable branching. (see #319). (default: 1). Since 2.5.0
• TAGLIST_PAGE_SIZE: Set the number of tags to display in one page. (default: 100). Since 2.5.0
• REGISTRY_SECURED: By default, the UI will check on every requests if your registry is secured or not (you will see 401 responses in your console). Set to true if your registry uses Basic Authentication and divide by two the number of call to your registry. (default false). Since 2.5.0

There are some examples with docker-compose and docker-registry-ui as proxy here or docker-registry-ui as standalone here.

Theme options

This featureswas added to version 2.4.0. See more about this in #283.

Environment variable	light theme value	dark theme value
THEME_PRIMARY_TEXT	#25313b	#8A9EBA
THEME_NEUTRAL_TEXT	#777777	#36527A
THEME_BACKGROUND	#ffffff	#22272e
THEME_HOVER_BACKGROUND	#eeeeee	#30404D
THEME_ACCENT_TEXT	#6680a1	#5684FF
THEME_HEADER_TEXT	#ffffff	#ffffff
THEME_HEADER_BACKGROUND	#25313b	#333A45
THEME_FOOTER_TEXT	#ffffff	#ffffff
THEME_FOOTER_NEUTRAL_TEXT	#999999	#999999
THEME_FOOTER_BACKGROUND	#555555	#555555

Recommended Docker Registry Usage

Here is a simple usage of Docker Registry UI with Docker Registry Server using docker-compose. This example should work for most of your use case and your UI will be on the same domain as you registry.

version: '3.8'

services:
  registry-ui:
    image: joxit/docker-registry-ui:main
    restart: always
    ports:
      - 80:80
    environment:
      - SINGLE_REGISTRY=true
      - REGISTRY_TITLE=Docker Registry UI
      - DELETE_IMAGES=true
      - SHOW_CONTENT_DIGEST=true
      - NGINX_PROXY_PASS_URL=http://registry-server:5000
      - SHOW_CATALOG_NB_TAGS=true
      - CATALOG_MIN_BRANCHES=1
      - CATALOG_MAX_BRANCHES=1
      - TAGLIST_PAGE_SIZE=100
      - REGISTRY_SECURED=false
      - CATALOG_ELEMENTS_LIMIT=1000
    container_name: registry-ui

  registry-server:
    image: registry:2.8.2
    restart: always
    environment:
      REGISTRY_HTTP_HEADERS_Access-Control-Allow-Origin: '[http://registry.example.com]'
      REGISTRY_HTTP_HEADERS_Access-Control-Allow-Methods: '[HEAD,GET,OPTIONS,DELETE]'
      REGISTRY_HTTP_HEADERS_Access-Control-Allow-Credentials: '[true]'
      REGISTRY_HTTP_HEADERS_Access-Control-Allow-Headers: '[Authorization,Accept,Cache-Control]'
      REGISTRY_HTTP_HEADERS_Access-Control-Expose-Headers: '[Docker-Content-Digest]'
      REGISTRY_STORAGE_DELETE_ENABLED: 'true'
    volumes:
      - ./registry/data:/var/lib/registry
    container_name: registry-server

Using CORS

Your server should be configured to accept CORS.

If your docker registry does not need credentials, you will need to send this HEADER:

Access-Control-Allow-Origin: ['*']

If your docker registry need credentials, you will need to send these HEADERS (you must add the protocol http/https and the port when not default 80/443):

http:
  headers:
    Access-Control-Allow-Origin: ['http://registry.example.com']
    Access-Control-Allow-Credentials: [true]
    Access-Control-Allow-Headers: ['Authorization', 'Accept', 'Cache-Control']
    Access-Control-Allow-Methods: ['HEAD', 'GET', 'OPTIONS'] # Optional

An alternative for CORS issues is a plugin on your browser, more info here (thank you xmontero).

⚠️ If you are using credential and still having issues, please read the the line about preflight requests and the bug in docker registry server in the FAQ before posting any issues.

Using delete

For deleting images, you need to activate the delete feature in the UI with DELETE_IMAGES=true and in your registry:

storage:
    delete:
      enabled: true

And you need to add these HEADERS:

http:
  headers:
    Access-Control-Allow-Methods: ['HEAD', 'GET', 'OPTIONS', 'DELETE']
    Access-Control-Allow-Headers: ['Authorization', 'Accept', 'Cache-Control']
    Access-Control-Expose-Headers: ['Docker-Content-Digest']

Registry example

Example of docker registry configuration file:

version: 0.1
log:
  fields:
    service: registry
storage:
  delete:
    enabled: true
  cache:
    blobdescriptor: inmemory
  filesystem:
    rootdirectory: /var/lib/registry
http:
  addr: :5000
  headers:
    X-Content-Type-Options: [nosniff]
    Access-Control-Allow-Origin: ['http://127.0.0.1:8000']
    Access-Control-Allow-Methods: ['HEAD', 'GET', 'OPTIONS', 'DELETE']
    Access-Control-Allow-Headers: ['Authorization', 'Accept', 'Cache-Control']
    Access-Control-Max-Age: [1728000]
    Access-Control-Allow-Credentials: [true]
    Access-Control-Expose-Headers: ['Docker-Content-Digest']
auth:
  htpasswd:
    realm: basic-realm
    path: /etc/docker/registry/htpasswd

Standalone Application

If you do not want to install the docker-registry-ui on your server, you may check out the Electron standalone application (not updated).

All examples

• Use docker-registry-ui as a proxy (use REGISTRY_URL)
• Use docker-registry-ui as standalone (use URL)
• Use docker-registry-ui with traefik
• Use docker-registry-ui with docker registry and Amazon s3 (#75)
• FIX revproxy to registry does not work when published under non-root url (#73)
• Use docker-registry-ui with HTTPS (#20)
• Unable to push image when docker-registry-ui is used as a proxy on non 80 port (#88)
• Add custom headers bases on environment variable and/or file when the ui is used as proxy (#89)
• UI showing same sha256 content digest for all tags + Delete is not working (#116)
• Electron-based Standalone Application (#129)
• Use docker-registry-ui as proxy with read-only right (#47)
• Use DEFAULT_REGISTRIES and READ_ONLY_REGISTRIES (#219)