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GitLab Container Registry

Since 8.8.0 GitLab introduces a container registry. GitLab is helping to authenticate the user against the registry and proxy it via Nginx. By Registry we mean the registry from docker whereas Container Registry is the feature in GitLab.

Prerequisites

Installation

Setup with Nginx as Reverse Proxy

We assume that you already have Nginx installed on your host system and that you use a reverse proxy configuration to connect to your GitLab container.

In this example we use a dedicated domain for the registry. The URLs for the GitLab installation and the registry are:

  • git.example.com
  • registry.example.com

Note: You could also run everything on the same domain and use different ports instead. The required configuration changes below should be straightforward.

Create auth tokens

GitLab needs a certificate ("auth token") to talk to the registry API. The tokens must be provided in the /certs directory of your container. You could use an existing domain ceritificate or create your own with a very long lifetime like this:

mkdir certs
cd certs
# Generate a random password password_file used in the next commands
openssl rand -hex -out password_file 32
# Create a PKCS#10 certificate request
openssl req -new -passout file:password_file -newkey rsa:4096 -batch > registry.csr
# Convert RSA key
openssl rsa -passin file:password_file -in privkey.pem -out registry.key
# Generate certificate
openssl x509 -in registry.csr -out registry.crt -req -signkey registry.key -days 10000

It doesn't matter which details (domain name, etc.) you enter during key creation. This information is not used at all.

Update docker-compose.yml

First add the configuration for the registry container to your docker-compose.yml.

    registry:
        image: registry
        restart: always
        expose:
            - "5000"
        ports:
            - "5000:5000"
        volumes:
            - ./gitlab/shared/registry:/registry
            - ./certs:/certs
        environment:
            - REGISTRY_LOG_LEVEL=info
            - REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY=/registry
            - REGISTRY_AUTH_TOKEN_REALM=https://git.example.com/jwt/auth
            - REGISTRY_AUTH_TOKEN_SERVICE=container_registry
            - REGISTRY_AUTH_TOKEN_ISSUER=gitlab-issuer
            - REGISTRY_AUTH_TOKEN_ROOTCERTBUNDLE=/certs/registry.crt
            - REGISTRY_STORAGE_DELETE_ENABLED=true

Important:

  1. Don't change REGISTRY_AUTH_TOKEN_SERVICE. It must have container_registry as value.
  2. REGISTRY_AUTH_TOKEN_REALM must look like https://git.example.com/jwt/auth. So the endpoint must be /jwt/auth.

These configuration options are required by the GitLab Container Registry.

Then update the volumes and environment sections of your gitlab container:

    gitlab:
        environment:
            # ...
            # Registry
            - GITLAB_REGISTRY_ENABLED=true
            - GITLAB_REGISTRY_HOST=registry.example.com
            - GITLAB_REGISTRY_PORT=443
            - GITLAB_REGISTRY_API_URL=http://registry:5000
            - GITLAB_REGISTRY_KEY_PATH=/certs/registry.key

        volumes:
            - ./gitlab:/home/git/data
            - ./certs:/certs

Nginx Site Configuration

server {
    root /dev/null;
    server_name registry.example.com;
    charset UTF-8;
    access_log /var/log/nginx/registry.example.com.access.log;
    error_log /var/log/nginx/registry.example.com.error.log;

    # Set up SSL only connections:
    listen *:443 ssl http2;
    ssl_certificate             /etc/letsencrypt/live/registry.example.com/fullchain.pem;
    ssl_certificate_key         /etc/letsencrypt/live/registry.example.com/privkey.pem;

    ssl_ciphers 'ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:ECDHE-RSA-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4';
    ssl_protocols  TLSv1 TLSv1.1 TLSv1.2;
    ssl_prefer_server_ciphers on;
    ssl_session_cache  builtin:1000  shared:SSL:10m;
    ssl_session_timeout  5m;

    client_max_body_size        0;
    chunked_transfer_encoding   on;

    location / {
        proxy_set_header  Host              $http_host;   # required for docker client's sake
        proxy_set_header  X-Real-IP         $remote_addr; # pass on real client's IP
        proxy_set_header  X-Forwarded-For   $proxy_add_x_forwarded_for;
        proxy_set_header  X-Forwarded-Proto $scheme;
        proxy_read_timeout                  900;
        proxy_pass        http://localhost:5000;
    }
}

server {
    listen *:80;
    server_name  registry.example.com;
    server_tokens off; ## Don't show the nginx version number, a security best practice
    return 301 https://$http_host:$request_uri;
}

Configuration

Available Parameters

Here is an example of all configuration parameters that can be used in the GitLab container.

...
gitlab:
    ...
    environment:
    - GITLAB_REGISTRY_ENABLED=true
    - GITLAB_REGISTRY_HOST=registry.gitlab.example.com
    - GITLAB_REGISTRY_API_URL=http://registry:5000
    - GITLAB_REGISTRY_KEY_PATH=/certs/registry-auth.key
    - GITLAB_REGISTRY_ISSUER=gitlab-issuer
    - SSL_REGISTRY_KEY_PATH=/certs/registry.key
    - SSL_REGISTRY_CERT_PATH=/certs/registry.crt

where:

Parameter Description
GITLAB_REGISTRY_ENABLED true or false. Enables the Registry in GitLab. By default this is false.
GITLAB_REGISTRY_HOST The host URL under which the Registry will run and the users will be able to use.
GITLAB_REGISTRY_PORT The port under which the external Registry domain will listen on.
GITLAB_REGISTRY_API_URL The internal API URL under which the Registry is exposed to.
GITLAB_REGISTRY_KEY_PATH The private key location that is a pair of Registry's rootcertbundle. Read the token auth configuration documentation.
GITLAB_REGISTRY_PATH This should be the same directory like specified in Registry's rootdirectory. Read the storage configuration documentation. This path needs to be readable by the GitLab user, the web-server user and the Registry user if you use filesystem as storage configuration. Read more in #container-registry-storage-path.
GITLAB_REGISTRY_ISSUER This should be the same value as configured in Registry's issuer. Otherwise the authentication will not work. For more info read the token auth configuration documentation.
SSL_REGISTRY_KEY_PATH The private key of the SSL_REGISTRY_CERT_PATH. This will be later used in nginx to proxy your registry via https.
SSL_REGISTRY_CERT_PATH The certificate for the private key of SSL_REGISTRY_KEY_PATH. This will be later used in nginx to proxy your registry via https.

For more info look at Available Configuration Parameters.

A minimum set of these parameters are required to use the GitLab Container Registry feature.

...
gitlab:
    environment:
    - GITLAB_REGISTRY_ENABLED=true
    - GITLAB_REGISTRY_HOST=registry.gitlab.example.com
    - GITLAB_REGISTRY_API_URL=http://registry:5000
    - GITLAB_REGISTRY_KEY_PATH=/certs/registry-auth.key
    - GITLAB_REGISTRY_ISSUER=gitlab-issuer
...

Container Registry storage driver

You can configure the Container Registry to use a different storage backend by configuring a different storage driver. By default the GitLab Container Registry is configured to use the filesystem driver, which makes use of storage path configuration. These configurations will all be done in the registry container.

The different supported drivers are:

Driver Description
filesystem Uses a path on the local filesystem
azure Microsoft Azure Blob Storage
gcs Google Cloud Storage
s3 Amazon Simple Storage Service
swift OpenStack Swift Object Storage
oss Aliyun OSS

Read more about the individual driver's config options in the Docker Registry docs.

Warning GitLab will not backup Docker images that are not stored on the filesystem. Remember to enable backups with your object storage provider if desired.

If you use filesystem as storage driver you need to mount the path from GITLAB_REGISTRY_DIR of the GitLab container in the registry container. So both container can access the registry data. If you don't change GITLAB_REGISTRY_DIR you will find your registry data in the mounted volume from the GitLab Container under ./gitlab/shared/registry. This don't need to be seprated mounted because ./gitlab is already mounted in the GitLab Container. If it will be mounted seperated the whole restoring proccess of GitLab backup won't work because gitlab try to create an folder under ./gitlab/shared/registry /GITLAB_REGISTRY_DIR and GitLab can't delete/remove the mount point inside the container so the restoring process of the backup will fail. An example how it works is in the docker-compose.

Example for Amazon Simple Storage Service (s3)

If you want to configure your registry via /etc/docker/registry/config.yml your storage part should like this snippet below.

storage:
  s3:
    accesskey: 'AKIAKIAKI'
    secretkey: 'secret123'
    bucket: 'gitlab-registry-bucket-AKIAKIAKI'
  cache:
    blobdescriptor: inmemory
  delete:
    enabled: true
 ...
 registry:
    restart: always
    image: registry:2.4.1
    volumes:
     - ./certs:/certs
    environment:
    - REGISTRY_LOG_LEVEL=info
    - REGISTRY_AUTH_TOKEN_REALM=https://gitlab.example.com:10080/jwt/auth
    - REGISTRY_AUTH_TOKEN_SERVICE=container_registry
    - REGISTRY_AUTH_TOKEN_ISSUER=gitlab-issuer
    - REGISTRY_AUTH_TOKEN_ROOTCERTBUNDLE=/certs/registry-auth.crt
    - REGISTRY_STORAGE_S3_ACCESSKEY=AKIAKIAKI
    - REGISTRY_STORAGE_S3_SECRETKEY=secret123
    - REGISTRY_STORAGE_S3_BUCKET=gitlab-registry-bucket-AKIAKIAKI
    - REGISTRY_CACHE_BLOBDESCRIPTOR=inmemory
    - REGISTRY_STORAGE_DELETE_ENABLED=true

Generaly for more information about the configuration of the registry container you can find it under registry configuration.

Storage limitations

Currently, there is no storage limitation, which means a user can upload an infinite amount of Docker images with arbitrary sizes. This setting will be configurable in future releases.

Maintenance

If you use another storage configuration than filesystem it will have no impact on your Maintenance workflow.

Creating Backups

Creating Backups is the same like without a container registry. I would recommend to stop your registry container.

docker stop registry gitlab && docker rm registry gitlab

Execute the rake task with a removeable container.

docker run --name gitlab -it --rm [OPTIONS] \
    sameersbn/gitlab:13.4.2 app:rake gitlab:backup:create

Restoring Backups

GitLab also defines a rake task to restore a backup.

Before performing a restore make sure the container is stopped and removed to avoid container name conflicts.

docker stop registry gitlab && docker rm registry gitlab

Execute the rake task to restore a backup. Make sure you run the container in interactive mode -it.

docker run --name gitlab -it --rm [OPTIONS] \
    sameersbn/gitlab:13.4.2 app:rake gitlab:backup:restore

The list of all available backups will be displayed in reverse chronological order. Select the backup you want to restore and continue.

To avoid user interaction in the restore operation, specify the timestamp of the backup using the BACKUP argument to the rake task.

docker run --name gitlab -it --rm [OPTIONS] \
    sameersbn/gitlab:13.4.2 app:rake gitlab:backup:restore BACKUP=1417624827

Upgrading from an existing GitLab installation

If you want enable this feature for an existing instance of GitLab you need to do the following steps.

  • Step 1: Update the docker image.
docker pull sameersbn/gitlab:13.4.2
  • Step 2: Stop and remove the currently running image
docker stop gitlab && docker rm gitlab
  • Step 3: Create a backup
docker run --name gitlab -it --rm [OPTIONS] \
    sameersbn/gitlab:x.x.x app:rake gitlab:backup:create

Important Notice

Storage of the registry must be mounted from gitlab from GitLab. GitLab must have the container of the registry storage folder to be able to create and restore backups

docker run --name registry -d \
--restart=always \
-v /srv/gitlab/shared/registry:/registry \
-v ./certs:/certs \
--env 'REGISTRY_LOG_LEVEL=info' \
--env 'REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY=/registry' \
--env 'REGISTRY_AUTH_TOKEN_REALM=http://gitlab.example.com/jwt/auth' \
--env 'REGISTRY_AUTH_TOKEN_SERVICE=container_registry' \
--env 'REGISTRY_AUTH_TOKEN_ISSUER=gitlab-issuer' \
--env 'REGISTRY_AUTH_TOKEN_ROOTCERTBUNDLE=/certs/registry-auth.crt' \
--env 'REGISTRY_STORAGE_DELETE_ENABLED=true' \
registry:2.4.1
  • Step 6: Start the image
docker run --name gitlab -d [PREVIOUS_OPTIONS] \
-v /srv/gitlab/certs:/certs \
--env 'SSL_REGISTRY_CERT_PATH=/certs/registry.crt' \
--env 'SSL_REGISTRY_KEY_PATH=/certs/registry.key' \
--env 'GITLAB_REGISTRY_ENABLED=true' \
--env 'GITLAB_REGISTRY_HOST=registry.gitlab.example.com' \
--env 'GITLAB_REGISTRY_API_URL=http://registry:5000/' \
--env 'GITLAB_REGISTRY_CERT_PATH=/certs/registry-auth.crt' \
--env 'GITLAB_REGISTRY_KEY_PATH=/certs/registry-auth.key' \
--link registry:registry
sameersbn/gitlab:13.4.2