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debian-mirror-gitlab/doc/workflow/lfs/lfs_administration.md
Sruthi Chandran fa176ca292 New upstream version 12.2.8
2019-10-12 21:52:04 +05:30

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GitLab Git LFS Administration

Documentation on how to use Git LFS are under Managing large binary files with Git LFS doc.

Requirements

  • Git LFS is supported in GitLab starting with version 8.2.
  • Support for object storage, such as AWS S3, was introduced in 10.0.
  • Users need to install Git LFS client version 1.0.1 and up.

Configuration

Git LFS objects can be large in size. By default, they are stored on the server GitLab is installed on.

There are various configuration options to help GitLab server administrators:

  • Enabling/disabling Git LFS support
  • Changing the location of LFS object storage
  • Setting up object storage supported by Fog

Configuration for Omnibus installations

In /etc/gitlab/gitlab.rb:

# Change to true to enable lfs - enabled by default if not defined
gitlab_rails['lfs_enabled'] = false

# Optionally, change the storage path location. Defaults to
# `#{gitlab_rails['shared_path']}/lfs-objects`. Which evaluates to
# `/var/opt/gitlab/gitlab-rails/shared/lfs-objects` by default.
gitlab_rails['lfs_storage_path'] = "/mnt/storage/lfs-objects"

Configuration for installations from source

In config/gitlab.yml:

# Change to true to enable lfs
  lfs:
    enabled: false
    storage_path: /mnt/storage/lfs-objects

Storing LFS objects in remote object storage

Introduced in GitLab Premium 10.0. Brought to GitLab Core in 10.7.

It is possible to store LFS objects in remote object storage which allows you to offload local hard disk R/W operations, and free up disk space significantly. GitLab is tightly integrated with Fog, so you can refer to its documentation to check which storage services can be integrated with GitLab. You can also use external object storage in a private local network. For example, Minio is a standalone object storage service, is easy to set up, and works well with GitLab instances.

GitLab provides two different options for the uploading mechanism: "Direct upload" and "Background upload".

Option 1. Direct upload

  1. User pushes an lfs file to the GitLab instance
  2. GitLab-workhorse uploads the file directly to the external object storage
  3. GitLab-workhorse notifies GitLab-rails that the upload process is complete

Option 2. Background upload

  1. User pushes an lfs file to the GitLab instance
  2. GitLab-rails stores the file in the local file storage
  3. GitLab-rails then uploads the file to the external object storage asynchronously

The following general settings are supported.

Setting Description Default
enabled Enable/disable object storage false
remote_directory The bucket name where LFS objects will be stored
direct_upload Set to true to enable direct upload of LFS without the need of local shared storage. Option may be removed once we decide to support only single storage for all files. false
background_upload Set to false to disable automatic upload. Option may be removed once upload is direct to S3 true
proxy_download Set to true to enable proxying all files served. Option allows to reduce egress traffic as this allows clients to download directly from remote storage instead of proxying all data false
connection Various connection options described below

The connection settings match those provided by Fog.

Here is a configuration example with S3.

Setting Description example
provider The provider name AWS
aws_access_key_id AWS credentials, or compatible ABC123DEF456
aws_secret_access_key AWS credentials, or compatible ABC123DEF456ABC123DEF456ABC123DEF456
aws_signature_version AWS signature version to use. 2 or 4 are valid options. Digital Ocean Spaces and other providers may need 2. 4
enable_signature_v4_streaming Set to true to enable HTTP chunked transfers with AWS v4 signatures (https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-streaming.html). Oracle Cloud S3 needs this to be false true
region AWS region us-east-1
host S3 compatible host for when not using AWS, e.g. localhost or storage.example.com s3.amazonaws.com
endpoint Can be used when configuring an S3 compatible service such as Minio, by entering a URL such as http://127.0.0.1:9000 (optional)
path_style Set to true to use host/bucket_name/object style paths instead of bucket_name.host/object. Leave as false for AWS S3 false
use_iam_profile Set to true to use IAM profile instead of access keys false

Here is a configuration example with GCS.

Setting Description example
provider The provider name Google
google_project GCP project name gcp-project-12345
google_client_email The email address of the service account foo@gcp-project-12345.iam.gserviceaccount.com
google_json_key_location The json key path /path/to/gcp-project-12345-abcde.json

NOTE: The service account must have permission to access the bucket. See more

Here is a configuration example with Rackspace Cloud Files.

Setting Description example
provider The provider name Rackspace
rackspace_username The username of the Rackspace account with access to the container joe.smith
rackspace_api_key The API key of the Rackspace account with access to the container ABC123DEF456ABC123DEF456ABC123DE
rackspace_region The Rackspace storage region to use, a three letter code from the list of service access endpoints iad
rackspace_temp_url_key The private key you have set in the Rackspace API for temporary URLs. Read more here ABC123DEF456ABC123DEF456ABC123DE

NOTES: Regardless of whether the container has public access enabled or disabled, Fog will use the TempURL method to grant access to LFS objects. If you see errors in logs referencing instantiating storage with a temp-url-key, ensure that you have set they key properly on the Rackspace API and in gitlab.rb. You can verify the value of the key Rackspace has set by sending a GET request with token header to the service access endpoint URL and comparing the output of the returned headers.

Manual uploading to an object storage

There are two ways to manually do the same thing as automatic uploading (described above).

Option 1: rake task

$ rake gitlab:lfs:migrate

Option 2: rails console

$ sudo gitlab-rails console            # Login to rails console

> # Upload LFS files manually
> LfsObject.where(file_store: [nil, 1]).find_each do |lfs_object|
>   lfs_object.file.migrate!(ObjectStorage::Store::REMOTE) if lfs_object.file.file.exists?
> end

S3 for Omnibus installations

On Omnibus installations, the settings are prefixed by lfs_object_store_:

  1. Edit /etc/gitlab/gitlab.rb and add the following lines by replacing with the values you want:

    gitlab_rails['lfs_object_store_enabled'] = true
gitlab_rails['lfs_object_store_remote_directory'] = "lfs-objects"
gitlab_rails['lfs_object_store_connection'] = {
  'provider' => 'AWS',
  'region' => 'eu-central-1',
  'aws_access_key_id' => '1ABCD2EFGHI34JKLM567N',
  'aws_secret_access_key' => 'abcdefhijklmnopQRSTUVwxyz0123456789ABCDE',
  # The below options configure an S3 compatible host instead of AWS
  'host' => 'localhost',
  'endpoint' => 'http://127.0.0.1:9000',
  'path_style' => true
}

  2. Save the file and reconfigure GitLabs for the changes to take effect.

  3. Migrate any existing local LFS objects to the object storage:

    gitlab-rake gitlab:lfs:migrate

    This will migrate existing LFS objects to object storage. New LFS objects will be forwarded to object storage unless gitlab_rails['lfs_object_store_background_upload'] is set to false.

S3 for installations from source

For source installations the settings are nested under lfs: and then object_store::

  1. Edit /home/git/gitlab/config/gitlab.yml and add or amend the following lines:

    lfs:
enabled: true
object_store:
  enabled: false
  remote_directory: lfs-objects # Bucket name
  connection:
    provider: AWS
    aws_access_key_id: 1ABCD2EFGHI34JKLM567N
    aws_secret_access_key: abcdefhijklmnopQRSTUVwxyz0123456789ABCDE
    region: eu-central-1
    # Use the following options to configure an AWS compatible host such as Minio
    host: 'localhost'
    endpoint: 'http://127.0.0.1:9000'
    path_style: true

  2. Save the file and restart GitLab for the changes to take effect.

  3. Migrate any existing local LFS objects to the object storage:

    sudo -u git -H bundle exec rake gitlab:lfs:migrate RAILS_ENV=production

    This will migrate existing LFS objects to object storage. New LFS objects will be forwarded to object storage unless background_upload is set to false.

Storage statistics

You can see the total storage used for LFS objects on groups and projects in the administration area, as well as through the groups and projects APIs.

Troubleshooting: Google::Apis::TransmissionError: execution expired

If LFS integration is configred with Google Cloud Storage and background uploads (background_upload: true and direct_upload: false), sidekiq workers may encouter this error. This is because the uploading timed out with very large files. LFS files up to 6Gb can be uploaded without any extra steps, otherwise you need to use the following workaround.

$ sudo gitlab-rails console            # Login to rails console

> # Set up timeouts. 20 minutes is enough to upload 30GB LFS files.
> # These settings are only in effect for the same session, i.e. they are not effective for sidekiq workers.
> ::Google::Apis::ClientOptions.default.open_timeout_sec = 1200
> ::Google::Apis::ClientOptions.default.read_timeout_sec = 1200
> ::Google::Apis::ClientOptions.default.send_timeout_sec = 1200

> # Upload LFS files manually. This process does not use sidekiq at all.
> LfsObject.where(file_store: [nil, 1]).find_each do |lfs_object|
>   lfs_object.file.migrate!(ObjectStorage::Store::REMOTE) if lfs_object.file.file.exists?
> end

See more information in !19581

Known limitations

  • Support for removing unreferenced LFS objects was added in 8.14 onwards.
  • LFS authentications via SSH was added with GitLab 8.12.
  • Only compatible with the GitLFS client versions 1.1.0 and up, or 1.0.2.
  • The storage statistics currently count each LFS object multiple times for every project linking to it.