--- stage: Package group: Container Registry info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/product/ux/technical-writing/#assignments --- # GitLab Container Registry **(FREE)** > - The group-level Container Registry was [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/23315) in GitLab 12.10. > - Searching by image repository name was [introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/31322) in GitLab 13.0. NOTE: If you pull container images from Docker Hub, you can also use the [GitLab Dependency Proxy](../dependency_proxy/index.md#use-the-dependency-proxy-for-docker-images) to avoid running into rate limits and speed up your pipelines. With the Docker Container Registry integrated into GitLab, every GitLab project can have its own space to store its Docker images. You can read more about Docker Registry at . This document is the user guide. To learn how to enable the Container Registry for your GitLab instance, visit the [administrator documentation](../../../administration/packages/container_registry.md). ## View the Container Registry You can view the Container Registry for a project or group. 1. Go to your project or group. 1. Go to **Packages and registries > Container Registry**. You can search, sort, filter, and [delete](#delete-images-from-within-gitlab) containers on this page. You can share a filtered view by copying the URL from your browser. Only members of the project or group can access a private project's Container Registry. If a project is public, so is the Container Registry. ### View the tags of a specific image You can view a list of tags associated with a given container image: 1. Go to your project or group. 1. Go to **Packages and registries > Container Registry**. 1. Select the container image you are interested in. This brings up the Container Registry **Tag Details** page. You can view details about each tag, such as when it was published, how much storage it consumes, and the manifest and configuration digests. You can search, sort (by tag name), filter, and [delete](#delete-images-from-within-gitlab) tags on this page. You can share a filtered view by copying the URL from your browser. ## Use images from the Container Registry To download and run a container image hosted in the GitLab Container Registry: 1. Copy the link to your container image: - Go to your project or group's **Packages and registries > Container Registry** and find the image you want. - Next to the image name, select **Copy**. ![Container Registry image URL](img/container_registry_hover_path_13_4.png) 1. Use `docker run` with the image link: ```shell docker run [options] registry.example.com/group/project/image [arguments] ``` [Authentication](#authenticate-with-the-container-registry) is needed to download images from private repository. For more information on running Docker containers, visit the [Docker documentation](https://docs.docker.com/get-started/). ## Image naming convention Images follow this naming convention: ```plaintext /// ``` If your project is `gitlab.example.com/mynamespace/myproject`, for example, then your image must be named `gitlab.example.com/mynamespace/myproject` at a minimum. You can append additional names to the end of an image name, up to two levels deep. For example, these are all valid image names for images within the project named `myproject`: ```plaintext registry.example.com/mynamespace/myproject:some-tag ``` ```plaintext registry.example.com/mynamespace/myproject/image:latest ``` ```plaintext registry.example.com/mynamespace/myproject/my/image:rc1 ``` ## Authenticate with the Container Registry To authenticate with the Container Registry, you can use a: - [Personal access token](../../profile/personal_access_tokens.md). - [Deploy token](../../project/deploy_tokens/index.md). - [Project access token](../../project/settings/project_access_tokens.md). - [Group access token](../../group/settings/group_access_tokens.md). All of these require the minimum scope to be: - For read (pull) access, `read_registry`. - For write (push) access, `write_registry` & `read_registry`. To authenticate, run the `docker` command. For example: ```shell docker login registry.example.com -u -p ``` ## Build and push images by using Docker commands Before you can build and push images, you must [authenticate](#authenticate-with-the-container-registry) with the Container Registry. To build and push to the Container Registry: 1. Authenticate with the Container Registry. 1. Run the command to build or push. For example, to build: ```shell docker build -t registry.example.com/group/project/image . ``` Or to push: ```shell docker push registry.example.com/group/project/image ``` To view these commands, go to your project's **Packages and registries > Container Registry**. ## Build and push by using GitLab CI/CD Use [GitLab CI/CD](../../../ci/yaml/index.md) to build and push images to the Container Registry. Use it to test, build, and deploy your project from the Docker image you created. ### Authenticate by using GitLab CI/CD Before you can build and push images by using GitLab CI/CD, you must authenticate with the Container Registry. To use CI/CD to authenticate, you can use: - The `CI_REGISTRY_USER` CI/CD variable. This variable has read-write access to the Container Registry and is valid for one job only. Its password is also automatically created and assigned to `CI_REGISTRY_PASSWORD`. ```shell docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY ``` - A [CI job token](../../../ci/jobs/ci_job_token.md). ```shell docker login -u $CI_REGISTRY_USER -p $CI_JOB_TOKEN $CI_REGISTRY ``` - A [deploy token](../../project/deploy_tokens/index.md#gitlab-deploy-token) with the minimum scope of: - For read (pull) access, `read_registry`. - For write (push) access, `write_registry`. ```shell docker login -u $CI_DEPLOY_USER -p $CI_DEPLOY_PASSWORD $CI_REGISTRY ``` - A [personal access token](../../profile/personal_access_tokens.md) with the minimum scope of: - For read (pull) access, `read_registry`. - For write (push) access, `write_registry`. ```shell docker login -u -p $CI_REGISTRY ``` ### Configure your `.gitlab-ci.yml` file You can configure your `.gitlab-ci.yml` file to build and push images to the Container Registry. - If multiple jobs require authentication, put the authentication command in the `before_script`. - Before building, use `docker build --pull` to fetch changes to base images. It takes slightly longer, but it ensures your image is up-to-date. - Before each `docker run`, do an explicit `docker pull` to fetch the image that was just built. This is especially important if you are using multiple runners that cache images locally. If you use the Git SHA in your image tag, each job is unique and you should never have a stale image. However, it's still possible to have a stale image if you re-build a given commit after a dependency has changed. - Don't build directly to the `latest` tag because multiple jobs may be happening simultaneously. ### Container Registry examples with GitLab CI/CD If you're using Docker-in-Docker on your runners, this is how your `.gitlab-ci.yml` should look: ```yaml build: image: docker:20.10.16 stage: build services: - docker:20.10.16-dind script: - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY - docker build -t $CI_REGISTRY/group/project/image:latest . - docker push $CI_REGISTRY/group/project/image:latest ``` You can also make use of [other CI/CD variables](../../../ci/variables/index.md) to avoid hard-coding: ```yaml build: image: docker:20.10.16 stage: build services: - docker:20.10.16-dind variables: IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG script: - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY - docker build -t $IMAGE_TAG . - docker push $IMAGE_TAG ``` Here, `$CI_REGISTRY_IMAGE` would be resolved to the address of the registry tied to this project. Since `$CI_COMMIT_REF_NAME` resolves to the branch or tag name, and your branch name can contain forward slashes (for example, `feature/my-feature`), it is safer to use `$CI_COMMIT_REF_SLUG` as the image tag. This is due to that image tags cannot contain forward slashes. We also declare our own variable, `$IMAGE_TAG`, combining the two to save us some typing in the `script` section. Here's a more elaborate example that splits up the tasks into 4 pipeline stages, including two tests that run in parallel. The `build` is stored in the container registry and used by subsequent stages, downloading the image when needed. Changes to `main` also get tagged as `latest` and deployed using an application-specific deploy script: ```yaml image: docker:20.10.16 services: - docker:20.10.16-dind stages: - build - test - release - deploy variables: # Use TLS https://docs.gitlab.com/ee/ci/docker/using_docker_build.html#tls-enabled DOCKER_HOST: tcp://docker:2376 DOCKER_TLS_CERTDIR: "/certs" CONTAINER_TEST_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG CONTAINER_RELEASE_IMAGE: $CI_REGISTRY_IMAGE:latest before_script: - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY build: stage: build script: - docker build --pull -t $CONTAINER_TEST_IMAGE . - docker push $CONTAINER_TEST_IMAGE test1: stage: test script: - docker pull $CONTAINER_TEST_IMAGE - docker run $CONTAINER_TEST_IMAGE /script/to/run/tests test2: stage: test script: - docker pull $CONTAINER_TEST_IMAGE - docker run $CONTAINER_TEST_IMAGE /script/to/run/another/test release-image: stage: release script: - docker pull $CONTAINER_TEST_IMAGE - docker tag $CONTAINER_TEST_IMAGE $CONTAINER_RELEASE_IMAGE - docker push $CONTAINER_RELEASE_IMAGE only: - main deploy: stage: deploy script: - ./deploy.sh only: - main environment: production ``` NOTE: This example explicitly calls `docker pull`. If you prefer to implicitly pull the built image using `image:`, and use either the [Docker](https://docs.gitlab.com/runner/executors/docker.html) or [Kubernetes](https://docs.gitlab.com/runner/executors/kubernetes.html) executor, make sure that [`pull_policy`](https://docs.gitlab.com/runner/executors/docker.html#how-pull-policies-work) is set to `always`. ### Using a Docker-in-Docker image from your Container Registry To use your own Docker images for Docker-in-Docker, follow these steps in addition to the steps in the [Docker-in-Docker](../../../ci/docker/using_docker_build.md#use-docker-in-docker) section: 1. Update the `image` and `service` to point to your registry. 1. Add a service [alias](../../../ci/services/index.md#available-settings-for-services). Below is an example of what your `.gitlab-ci.yml` should look like: ```yaml build: image: $CI_REGISTRY/group/project/docker:20.10.16 services: - name: $CI_REGISTRY/group/project/docker:20.10.16-dind alias: docker stage: build script: - docker build -t my-docker-image . - docker run my-docker-image /script/to/run/tests ``` If you forget to set the service alias, the `docker:20.10.16` image is unable to find the `dind` service, and an error like the following is thrown: ```plaintext error during connect: Get http://docker:2376/v1.39/info: dial tcp: lookup docker on 192.168.0.1:53: no such host ``` ### Using a Docker-in-Docker image with Dependency Proxy To use your own Docker images with Dependency Proxy, follow these steps in addition to the steps in the [Docker-in-Docker](../../../ci/docker/using_docker_build.md#use-docker-in-docker) section: 1. Update the `image` and `service` to point to your registry. 1. Add a service [alias](../../../ci/services/index.md#available-settings-for-services). Below is an example of what your `.gitlab-ci.yml` should look like: ```yaml build: image: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/docker:20.10.16 services: - name: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/docker:18.09.7-dind alias: docker stage: build script: - docker build -t my-docker-image . - docker run my-docker-image /script/to/run/tests ``` If you forget to set the service alias, the `docker:20.10.16` image is unable to find the `dind` service, and an error like the following is thrown: ```plaintext error during connect: Get http://docker:2376/v1.39/info: dial tcp: lookup docker on 192.168.0.1:53: no such host ``` ## Delete images You can delete images from your Container Registry in multiple ways. WARNING: Deleting images is a destructive action and can't be undone. To restore a deleted image, you must rebuild and re-upload it. On self-managed instances, deleting an image doesn't free up storage space - it only marks the image as eligible for deletion. To actually delete images and recover storage space, in case they're unreferenced, administrators must run [garbage collection](../../../administration/packages/container_registry.md#container-registry-garbage-collection). On GitLab.com, the latest version of the Container Registry includes an automatic online garbage collector. For more information, see [this blog post](https://about.gitlab.com/blog/2021/10/25/gitlab-com-container-registry-update/). This is an instance-wide feature, rolling out gradually to a subset of the user base, so some new image repositories created from GitLab 14.5 onwards are served by this new version of the Container Registry. In this new version of the Container Registry, layers that aren't referenced by any image manifest, and image manifests that have no tags and aren't referenced by another manifest (such as multi-architecture images), are automatically scheduled for deletion after 24 hours if left unreferenced. ### Delete images from within GitLab To delete images from within GitLab: 1. Navigate to your project's or group's **Packages and registries > Container Registry**. 1. From the **Container Registry** page, you can select what you want to delete, by either: - Deleting the entire repository, and all the tags it contains, by selecting the red **{remove}** **Trash** icon. - Navigating to the repository, and deleting tags individually or in bulk by selecting the red **{remove}** **Trash** icon next to the tag you want to delete. 1. In the dialog box, select **Remove tag**. ### Delete images using the API If you want to automate the process of deleting images, GitLab provides an API. For more information, see the following endpoints: - [Delete a Registry repository](../../../api/container_registry.md#delete-registry-repository) - [Delete an individual Registry repository tag](../../../api/container_registry.md#delete-a-registry-repository-tag) - [Delete Registry repository tags in bulk](../../../api/container_registry.md#delete-registry-repository-tags-in-bulk) ### Delete images using GitLab CI/CD WARNING: GitLab CI/CD doesn't provide a built-in way to remove your images, but this example uses a third-party tool called [reg](https://github.com/genuinetools/reg) that talks to the GitLab Registry API. You are responsible for your own actions. For assistance with this tool, see [the issue queue for reg](https://github.com/genuinetools/reg/issues). The following example defines two stages: `build`, and `clean`. The `build_image` job builds the Docker image for the branch, and the `delete_image` job deletes it. The `reg` executable is downloaded and used to remove the image matching the `$CI_PROJECT_PATH:$CI_COMMIT_REF_SLUG` [predefined CI/CD variable](../../../ci/variables/predefined_variables.md). To use this example, change the `IMAGE_TAG` variable to match your needs: ```yaml stages: - build - clean build_image: image: docker:20.10.16 stage: build services: - docker:20.10.16-dind variables: IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG script: - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY - docker build -t $IMAGE_TAG . - docker push $IMAGE_TAG only: - branches except: - main delete_image: image: docker:20.10.16 stage: clean services: - docker:20.10.16-dind variables: IMAGE_TAG: $CI_PROJECT_PATH:$CI_COMMIT_REF_SLUG REG_SHA256: ade837fc5224acd8c34732bf54a94f579b47851cc6a7fd5899a98386b782e228 REG_VERSION: 0.16.1 before_script: - apk add --no-cache curl - curl --fail --show-error --location "https://github.com/genuinetools/reg/releases/download/v$REG_VERSION/reg-linux-amd64" --output /usr/local/bin/reg - echo "$REG_SHA256 /usr/local/bin/reg" | sha256sum -c - - chmod a+x /usr/local/bin/reg script: - /usr/local/bin/reg rm -d --auth-url $CI_REGISTRY -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $IMAGE_TAG only: - branches except: - main ``` NOTE: You can download the latest `reg` release from [the releases page](https://github.com/genuinetools/reg/releases), then update the code example by changing the `REG_SHA256` and `REG_VERSION` variables defined in the `delete_image` job. ### Delete images by using a cleanup policy You can create a per-project [cleanup policy](reduce_container_registry_storage.md#cleanup-policy) to ensure older tags and images are regularly removed from the Container Registry. ## Limitations - Moving or renaming existing Container Registry repositories is not supported once you have pushed images, because the images are stored in a path that matches the repository path. To move or rename a repository with a Container Registry, you must delete all existing images. Community suggestions to work around this limitation have been shared in [issue 18383](https://gitlab.com/gitlab-org/gitlab/-/issues/18383#possible-workaround). - Prior to GitLab 12.10, any tags that use the same image ID as the `latest` tag are not deleted by the cleanup policy. ## Disable the Container Registry for a project The Container Registry is enabled by default. You can, however, remove the Container Registry for a project: 1. Go to your project's **Settings > General** page. 1. Expand the **Visibility, project features, permissions** section and disable **Container Registry**. 1. Select **Save changes**. The **Packages and registries > Container Registry** entry is removed from the project's sidebar. ## Change visibility of the Container Registry > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/18792) in GitLab 14.2. By default, the Container Registry is visible to everyone with access to the project. You can, however, change the visibility of the Container Registry for a project. See the [Container Registry visibility permissions](#container-registry-visibility-permissions) for more details about the permissions that this setting grants to users. 1. Go to your project's **Settings > General** page. 1. Expand the section **Visibility, project features, permissions**. 1. Under **Container Registry**, select an option from the dropdown list: - **Everyone With Access** (Default): The Container Registry is visible to everyone with access to the project. If the project is public, the Container Registry is also public. If the project is internal or private, the Container Registry is also internal or private. - **Only Project Members**: The Container Registry is visible only to project members with Reporter role or higher. This is similar to the behavior of a private project with Container Registry visibility set to **Everyone With Access**. 1. Select **Save changes**. ## Container Registry visibility permissions The ability to view the Container Registry and pull images is controlled by the Container Registry's visibility permissions. You can change this through the [visibility setting on the UI](#change-visibility-of-the-container-registry) or the [API](../../../api/container_registry.md#change-the-visibility-of-the-container-registry). [Other permissions](../../permissions.md) such as updating the Container Registry, pushing or deleting images, and so on are not affected by this setting. However, disabling the Container Registry disables all Container Registry operations. | | | Anonymous
(Everyone on internet) | Guest | Reporter, Developer, Maintainer, Owner | | -------------------- | --------------------- | --------- | ----- | ------------------------------------------ | | Public project with Container Registry visibility
set to **Everyone With Access** (UI) or `enabled` (API) | View Container Registry
and pull images | Yes | Yes | Yes | | Public project with Container Registry visibility
set to **Only Project Members** (UI) or `private` (API) | View Container Registry
and pull images | No | No | Yes | | Internal project with Container Registry visibility
set to **Everyone With Access** (UI) or `enabled` (API) | View Container Registry
and pull images | No | Yes | Yes | | Internal project with Container Registry visibility
set to **Only Project Members** (UI) or `private` (API) | View Container Registry
and pull images | No | No | Yes | | Private project with Container Registry visibility
set to **Everyone With Access** (UI) or `enabled` (API) | View Container Registry
and pull images | No | No | Yes | | Private project with Container Registry visibility
set to **Only Project Members** (UI) or `private` (API) | View Container Registry
and pull images | No | No | Yes | | Any project with Container Registry `disabled` | All operations on Container Registry | No | No | No | ## Troubleshooting the GitLab Container Registry ### Migrating OCI container images to GitLab Container Registry Migrating built container images to the GitLab registry is not a current feature. However, an [epic](https://gitlab.com/groups/gitlab-org/-/epics/5210) is open to track the work on this feature. Some third-party tools can help migrate container images, for example, [skopeo](https://github.com/containers/skopeo), which can [copy container images](https://github.com/containers/skopeo#copying-images) between various storage mechanisms. You can use skopeo to copy from container registries, container storage backends, local directories, and local OCI-layout directories to the GitLab Container Registry. ### Docker connection error A Docker connection error can occur when there are special characters in either the group, project or branch name. Special characters can include: - Leading underscore - Trailing hyphen/dash To get around this, you can [change the group path](../../group/manage.md#change-a-groups-path), [change the project path](../../project/settings/index.md#rename-a-repository) or change the branch name. You may also get a `404 Not Found` or `Unknown Manifest` message if you are using a Docker Engine version earlier than 17.12. Later versions of Docker Engine use [the v2 API](https://docs.docker.com/registry/spec/manifest-v2-2/). The images in your GitLab Container Registry must also use the Docker v2 API. For information on how to update your images, see the [Docker help](https://docs.docker.com/registry/spec/deprecated-schema-v1). ### `Blob unknown to registry` error when pushing a manifest list When [pushing a Docker manifest list](https://docs.docker.com/engine/reference/commandline/manifest/#create-and-push-a-manifest-list) to the GitLab Container Registry, you may receive the error `manifest blob unknown: blob unknown to registry`. This is likely caused by having multiple images with different architectures, spread out over several repositories instead of the same repository. For example, you may have two images, each representing an architecture: - The `amd64` platform - The `arm64v8` platform To build a multi-arch image with these images, you must push them to the same repository as the multi-arch image. To address the `Blob unknown to registry` error, include the architecture in the tag name of individual images. For example, use `mygroup/myapp:1.0.0-amd64` and `mygroup/myapp:1.0.0-arm64v8`. You can then tag the manifest list with `mygroup/myapp:1.0.0`. ### Troubleshoot as a GitLab server administrator Troubleshooting the GitLab Container Registry, most of the times, requires you to sign in to GitLab server with administrator access. [Read how to troubleshoot the Container Registry](../../../administration/packages/container_registry.md#troubleshooting). ### Unable to change path or transfer a project If you try to change a project's path or transfer a project to a new namespace, you may receive one of the following errors: - "Project cannot be transferred, because tags are present in its container registry." - "Namespace cannot be moved because at least one project has tags in container registry." This issue occurs when the project has images in the Container Registry. You must delete or move these images before you can change the path or transfer the project. The following procedure uses these sample project names: - For the current project: `gitlab.example.com/org/build/sample_project/cr:v2.9.1` - For the new project: `gitlab.example.com/new_org/build/new_sample_project/cr:v2.9.1` Use your own URLs to complete the following steps: 1. Download the Docker images on your computer: ```shell docker login gitlab.example.com docker pull gitlab.example.com/org/build/sample_project/cr:v2.9.1 ``` NOTE: For container registry authentication, use either a [personal access token](../../profile/personal_access_tokens.md) or a [deploy token](../../project/deploy_tokens/index.md). 1. Rename the images to match the new project name: ```shell docker tag gitlab.example.com/org/build/sample_project/cr:v2.9.1 gitlab.example.com/new_org/build/new_sample_project/cr:v2.9.1 ``` 1. Delete the images in the old project by using the [UI](#delete-images) or [API](../../../api/packages.md#delete-a-project-package). There may be a delay while the images are queued and deleted. 1. Change the path or transfer the project by going to **Settings > General** and expanding **Advanced**. 1. Restore the images: ```shell docker push gitlab.example.com/new_org/build/new_sample_project/cr:v2.9.1 ``` Follow [this issue](https://gitlab.com/gitlab-org/gitlab/-/issues/18383) for details. ### Tags on S3 backend remain after successful deletion requests With S3 as your storage backend, tags may remain even though: - In the UI, you see that the tags are scheduled for deletion. - In the API, you get an HTTP `200` response. - The registry log shows a successful `Delete` request. An example `DELETE` request in the registry log: ```shell {"content_type":"","correlation_id":"01FQGNSKVMHQEAVE21KYTJN2P4","duration_ms":62,"host":"localhost:5000","level":"info","method":"DELETE","msg":"access","proto":"HTTP/1.1","referrer":"","remote_addr":"127.0.0.1:47498","remote_ip":"127.0.0.1","status":202,"system":"http","time":"2021-12-22T08:58:15Z","ttfb_ms":62,"uri":"/v2//tags/reference/","user_agent":"GitLab/","written_bytes":0} ``` There may be some errors not properly cached. Follow these steps to investigate further: 1. In your configuration file, set the registry's log level to `debug`, and the S3 driver's log level to `logdebugwithhttpbody`. For Omnibus, make these edits in the `gitlab.rb` file: ```shell # Change the registry['log_level'] to debug registry['log_level'] = 'debug' # Set log level for registry log from storage side registry['storage'] = { 's3' => { 'bucket' => 'your-s3-bucket', 'region' => 'your-s3-region' }, 'loglevel' = "logdebugwithhttpbody" } ``` Then save and reconfigure GitLab: ```shell sudo gitlab-ctl reconfigure ``` 1. Attempt to delete one or more tags using the GitLab UI or API. 1. Inspect the registry logs and look for a response from S3. Although the response could be `200 OK`, the body might have the error `AccessDenied`. This indicates a permission problem from the S3 side. 1. Ensure your S3 configuration has the `deleteObject` permission scope. Here's an [example role for an S3 bucket](../../../administration/object_storage.md#iam-permissions). Once adjusted, trigger another tag deletion. You should be able to successfully delete tags. Follow [this issue](https://gitlab.com/gitlab-org/container-registry/-/issues/551) for details. ### Tags temporarily cannot be marked for deletion GitLab is [migrating to the next generation of the Container Registry](https://gitlab.com/groups/gitlab-org/-/epics/5523). During the migration, you may encounter difficulty deleting tags. If you encounter an error, it's likely that your image repository is in the process of being migrated. Wait a few minutes and try again. ### `unauthorized: authentication required` when pushing large images When pushing large images, you might get an error like the following: ```shell docker push gitlab.example.com/myproject/docs:latest The push refers to a repository [gitlab.example.com/myproject/docs] 630816f32edb: Preparing 530d5553aec8: Preparing ... 4b0bab9ff599: Waiting d1c800db26c7: Waiting 42755cf4ee95: Waiting unauthorized: authentication required ``` On self-managed GitLab instances, by default, tokens for the Container Registry expire every five minutes. When pushing larger images, or images that take longer than five minutes to push, you might encounter this error. On GitLab.com, the expiration time is 15 minutes. If you are using self-managed GitLab, you can ask an administrator to [increase the token duration](../../../administration/packages/container_registry.md#increase-token-duration) if necessary.