Build a docker registry with custom authorization

jimmywa 2021-04-16 18:18:53
build docker registry custom authorization

1. Introduction to authentication

build by oneself docker registry Relatively simple , however docker registry It's very elegant how to combine the authentication with the existing system , We can customize some rules to allow / Refuse to pull and push some accounts or push only . The basic idea of realization :

  • Customize a docker registry Mirror image , It can be based on an existing official image , Specify the authentication service address in the definition image
  • Set up an authentication image , In this image, you can include custom authentication logic and warehouse ACL
  • Deploy the above two services

2. Customize Docker Registory

FROM centos:7.6.1810
RUN mkdir -p /var/lib/registry
COPY config/config.yml /etc/docker/registry/config.yml
COPY ssl/ /ssl/
COPY ./cert/ /etc/pki/ca-trust/source/anchors/digicert-ng.pem
RUN update-ca-trust extract
CMD ["/bin/registry", "serve", "/etc/docker/registry/config.yml"]

3. Custom permission image ( a key )

3.1 Mirror image

Here is an open source basic image with full functions : cesanta/docker_auth, In order to understand the image configuration, you need to learn the basic knowledge of the image .

FROM cesanta/docker_auth as cesanta
FROM python:2.7.18-alpine
COPY --from=cesanta /docker_auth/ /docker_auth/
ENTRYPOINT ["/docker_auth/auth_server"]
CMD ["-alsologtostderr=true", "-log_dir=/logs", "/config/extAuth.yml"]
COPY config/ /config/
COPY ssl/ /ssl/
COPY extensions/ /extensions/

3.2 Image configuration

There are two configurations in the image above config/extensions

  • config Configuration parameters , The following configuration is configured auth and registry Communication is https Certificate ,token Of issuer, Extend Authorization ext_auth, also acl, These are the key configurations
server: # Server settings.
addr: ":5001"
certificate: "/ssl/domain.crt"
key: "/ssl/domain.key"
token: # Settings for the tokens.
issuer: "Auth Service" # Must match issuer in the Registry config.
expiration: 900
command: "/extensions/" # Can be a relative path too; $PATH works.
args: [""]
- match: { ip: "" }
actions: ["*"]
comment: "Allow everything from localhost (IPv4)"
- match: { account: "/.+/", type: "registry", name: "catalog" }
actions: ["*"]
comment: "Logged in users can query the catalog."
- match: { labels: { "group": "CICD" } }
actions: ["*"]
comment: "User assigned to group 'CICD' is able to push"
- match: { account: "/.+/" }
actions: ["pull"]
comment: "Logged in users can pull all images."
  • extensions Configuration is based on the above configuration ext_auth, For example, a script :
read u p
if [ "$u" == "cicd" ]; then
if [ "$p" == "$CICD_SECRET" ]; then
echo '{"labels": {"group": ["CICD"]}}'
exit 0
exit 1
python /extensions/ "$u" "$p"
exit $?

3.3 Authentication image project directory

├── Dockerfile
├── config
│ └── extAuth.yml
├── extensions
│ ├──
│ └──
└── ssl
├── domain.crt
├── domain.csr
└── domain.key It's what configuration requires shell Script , Scripts don't configure standard output , Exited code yes 0 perhaps 1. Of Python Scripts can customize more flexible logic , Like sending Restful Request to an existing service , Judge whether the login is successful , Success principle exit(0), otherwise exit(1).

4. Deploy

With mirror deployment, it's easy :

  • Deploy registry And expose an access address
  • Deploy auth And deploy and expose an access address
  • Two access addresses IP Or the domain name is the same , however auth The port of is 5001 After deployment, both services can be accessed , You can check whether the two services are normal through the following command :

5. Troubleshooting


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