0d4c6a14d8
This updates redirected links in integration, update, user and workflow dirs. Should now link to final URLs to avoid redirect hops
362 lines
16 KiB
Markdown
362 lines
16 KiB
Markdown
# GitLab.com settings
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In this page you will find information about the settings that are used on
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[GitLab.com](https://about.gitlab.com/pricing/).
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## SSH host keys fingerprints
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Below are the fingerprints for GitLab.com's SSH host keys.
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| Algorithm | MD5 | SHA256 |
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| --------- | --- | ------- |
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| DSA | `7a:47:81:3a:ee:89:89:64:33:ca:44:52:3d:30:d4:87` | `p8vZBUOR0XQz6sYiaWSMLmh0t9i8srqYKool/Xfdfqw` |
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| ECDSA | `f1:d0:fb:46:73:7a:70:92:5a:ab:5d:ef:43:e2:1c:35` | `HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw` |
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| ED25519 | `2e:65:6a:c8:cf:bf:b2:8b:9a:bd:6d:9f:11:5c:12:16` | `eUXGGm1YGsMAS7vkcx6JOJdOGHPem5gQp4taiCfCLB8` |
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| RSA | `b6:03:0e:39:97:9e:d0:e7:24:ce:a3:77:3e:01:42:09` | `ROQFvPThGrW4RuWLoL9tq9I9zJ42fK4XywyRtbOz/EQ` |
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## Mail configuration
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GitLab.com sends emails from the `mg.gitlab.com` domain via [Mailgun] and has
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its own dedicated IP address (`198.61.254.240`).
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## Alternative SSH port
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GitLab.com can be reached via a [different SSH port][altssh] for `git+ssh`.
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| Setting | Value |
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| --------- | ------------------- |
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| `Hostname` | `altssh.gitlab.com` |
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| `Port` | `443` |
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An example `~/.ssh/config` is the following:
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```
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Host gitlab.com
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Hostname altssh.gitlab.com
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User git
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Port 443
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PreferredAuthentications publickey
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IdentityFile ~/.ssh/gitlab
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```
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## GitLab Pages
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Below are the settings for [GitLab Pages].
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| Setting | GitLab.com | Default |
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| ----------------------- | ---------------- | ------------- |
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| Domain name | `gitlab.io` | - |
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| IP address | `35.185.44.232` | - |
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| Custom domains support | yes | no |
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| TLS certificates support| yes | no |
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The maximum size of your Pages site is regulated by the artifacts maximum size
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which is part of [GitLab CI/CD](#gitlab-cicd).
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## GitLab CI/CD
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Below are the current settings regarding [GitLab CI/CD](../../ci/README.md).
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| Setting | GitLab.com | Default |
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| ----------- | ----------------- | ------------- |
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| Artifacts maximum size | 1G | 100M |
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| Artifacts [expiry time](../../ci/yaml/README.md#artifactsexpire_in) | kept forever | deleted after 30 days unless otherwise specified |
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## Repository size limit
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The maximum size your Git repository is allowed to be, including LFS. If you are near
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or over the size limit, you can [reduce your repository size with Git](../project/repository/reducing_the_repo_size_using_git.md).
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| Setting | GitLab.com | Default |
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| ----------- | ----------------- | ------------- |
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| Repository size including LFS | 10G | Unlimited |
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## IP range
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GitLab.com, CI/CD, and related services are deployed into Google Cloud Platform (GCP). Any
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IP based firewall can be configured by looking up all
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[IP address ranges or CIDR blocks for GCP](https://cloud.google.com/compute/docs/faq#where_can_i_find_product_name_short_ip_ranges).
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[Static endpoints](https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/5071) are being considered.
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## Shared Runners
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Shared Runners on GitLab.com run in [autoscale mode] and powered by
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Google Cloud Platform. Autoscaling means reduced
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waiting times to spin up CI/CD jobs, and isolated VMs for each project,
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thus maximizing security.
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They're free to use for public open source projects and limited to 2000 CI
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minutes per month per group for private projects. Read about all
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[GitLab.com plans](https://about.gitlab.com/pricing/).
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All your CI/CD jobs run on [n1-standard-1 instances](https://cloud.google.com/compute/docs/machine-types) with 3.75GB of RAM, CoreOS and the latest Docker Engine
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installed. Instances provide 1 vCPU and 25GB of HDD disk space. The default
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region of the VMs is US East1.
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Each instance is used only for one job, this ensures any sensitive data left on the system can't be accessed by other people their CI jobs.
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Jobs handled by the shared Runners on GitLab.com (`shared-runners-manager-X.gitlab.com`),
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**will be timed out after 3 hours**, regardless of the timeout configured in a
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project. Check the issues [4010] and [4070] for the reference.
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Below are the shared Runners settings.
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| Setting | GitLab.com | Default |
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| ----------- | ----------------- | ---------- |
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| [GitLab Runner] | [Runner versions dashboard][ci_version_dashboard] | - |
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| Executor | `docker+machine` | - |
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| Default Docker image | `ruby:2.5` | - |
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| `privileged` (run [Docker in Docker]) | `true` | `false` |
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[ci_version_dashboard]: https://dashboards.gitlab.com/dashboard/db/ci?from=now-1h&to=now&refresh=5m&orgId=1&panelId=12&fullscreen&theme=light
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### `config.toml`
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The full contents of our `config.toml` are:
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**DigitalOcean**
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```toml
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concurrent = X
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check_interval = 1
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metrics_server = "X"
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sentry_dsn = "X"
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[[runners]]
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name = "docker-auto-scale"
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request_concurrency = X
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url = "https://gitlab.com/"
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token = "SHARED_RUNNER_TOKEN"
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executor = "docker+machine"
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environment = [
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"DOCKER_DRIVER=overlay2"
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]
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limit = X
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[runners.docker]
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image = "ruby:2.5"
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privileged = true
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[runners.machine]
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IdleCount = 20
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IdleTime = 1800
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OffPeakPeriods = ["* * * * * sat,sun *"]
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OffPeakTimezone = "UTC"
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OffPeakIdleCount = 5
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OffPeakIdleTime = 1800
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MaxBuilds = 1
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MachineName = "srm-%s"
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MachineDriver = "digitalocean"
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MachineOptions = [
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"digitalocean-image=X",
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"digitalocean-ssh-user=core",
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"digitalocean-region=nyc1",
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"digitalocean-size=s-2vcpu-2gb",
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"digitalocean-private-networking",
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"digitalocean-tags=shared_runners,gitlab_com",
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"engine-registry-mirror=http://INTERNAL_IP_OF_OUR_REGISTRY_MIRROR",
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"digitalocean-access-token=DIGITAL_OCEAN_ACCESS_TOKEN",
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]
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[runners.cache]
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Type = "s3"
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BucketName = "runner"
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Insecure = true
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Shared = true
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ServerAddress = "INTERNAL_IP_OF_OUR_CACHE_SERVER"
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AccessKey = "ACCESS_KEY"
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SecretKey = "ACCESS_SECRET_KEY"
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```
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**Google Cloud Platform**
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```toml
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concurrent = X
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check_interval = 1
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metrics_server = "X"
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sentry_dsn = "X"
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[[runners]]
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name = "docker-auto-scale"
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request_concurrency = X
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url = "https://gitlab.com/"
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token = "SHARED_RUNNER_TOKEN"
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executor = "docker+machine"
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environment = [
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"DOCKER_DRIVER=overlay2"
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]
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limit = X
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[runners.docker]
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image = "ruby:2.5"
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privileged = true
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[runners.machine]
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IdleCount = 20
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IdleTime = 1800
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OffPeakPeriods = ["* * * * * sat,sun *"]
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OffPeakTimezone = "UTC"
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OffPeakIdleCount = 5
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OffPeakIdleTime = 1800
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MaxBuilds = 1
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MachineName = "srm-%s"
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MachineDriver = "google"
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MachineOptions = [
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"google-project=PROJECT",
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"google-disk-size=25",
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"google-machine-type=n1-standard-1",
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"google-username=core",
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"google-tags=gitlab-com,srm",
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"google-use-internal-ip",
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"google-zone=us-east1-d",
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"google-machine-image=PROJECT/global/images/IMAGE",
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"engine-registry-mirror=http://INTERNAL_IP_OF_OUR_REGISTRY_MIRROR"
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]
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[runners.cache]
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Type = "s3"
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BucketName = "runner"
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Insecure = true
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Shared = true
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ServerAddress = "INTERNAL_IP_OF_OUR_CACHE_SERVER"
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AccessKey = "ACCESS_KEY"
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SecretKey = "ACCESS_SECRET_KEY"
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```
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## Sidekiq
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GitLab.com runs [Sidekiq][sidekiq] with arguments `--timeout=4 --concurrency=4`
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and the following environment variables:
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| Setting | GitLab.com | Default |
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|-------- |----------- |-------- |
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| `SIDEKIQ_MEMORY_KILLER_MAX_RSS` | `1000000` | `1000000` |
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| `SIDEKIQ_MEMORY_KILLER_SHUTDOWN_SIGNAL` | `SIGKILL` | - |
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| `SIDEKIQ_LOG_ARGUMENTS` | `1` | - |
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## Cron jobs
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Periodically executed jobs by Sidekiq, to self-heal GitLab, do external
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synchronizations, run scheduled pipelines, etc.:
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| Setting | GitLab.com | Default |
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|-------- |------------- |------------- |
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| `pipeline_schedule_worker` | `19 * * * *` | `19 * * * *` |
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## PostgreSQL
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GitLab.com being a fairly large installation of GitLab means we have changed
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various PostgreSQL settings to better suit our needs. For example, we use
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streaming replication and servers in hot-standby mode to balance queries across
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different database servers.
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The list of GitLab.com specific settings (and their defaults) is as follows:
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| Setting | GitLab.com | Default |
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|:------------------------------------|:--------------------------------------------------------------------|:--------------------------------------|
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| archive_command | `/usr/bin/envdir /etc/wal-e.d/env /opt/wal-e/bin/wal-e wal-push %p` | empty |
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| archive_mode | on | off |
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| autovacuum_analyze_scale_factor | 0.01 | 0.01 |
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| autovacuum_max_workers | 6 | 3 |
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| autovacuum_vacuum_cost_limit | 1000 | -1 |
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| autovacuum_vacuum_scale_factor | 0.01 | 0.02 |
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| checkpoint_completion_target | 0.7 | 0.9 |
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| checkpoint_segments | 32 | 10 |
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| effective_cache_size | 338688MB | Based on how much memory is available |
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| hot_standby | on | off |
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| hot_standby_feedback | on | off |
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| log_autovacuum_min_duration | 0 | -1 |
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| log_checkpoints | on | off |
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| log_line_prefix | `%t [%p]: [%l-1]` | empty |
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| log_min_duration_statement | 1000 | -1 |
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| log_temp_files | 0 | -1 |
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| maintenance_work_mem | 2048MB | 16 MB |
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| max_replication_slots | 5 | 0 |
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| max_wal_senders | 32 | 0 |
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| max_wal_size | 5GB | 1GB |
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| shared_buffers | 112896MB | Based on how much memory is available |
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| shared_preload_libraries | pg_stat_statements | empty |
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| shmall | 30146560 | Based on the server's capabilities |
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| shmmax | 123480309760 | Based on the server's capabilities |
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| wal_buffers | 16MB | -1 |
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| wal_keep_segments | 512 | 10 |
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| wal_level | replica | minimal |
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| statement_timeout | 15s | 60s |
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| idle_in_transaction_session_timeout | 60s | 60s |
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Some of these settings are in the process being adjusted. For example, the value
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for `shared_buffers` is quite high and as such we are looking into adjusting it.
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More information on this particular change can be found at
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<https://gitlab.com/gitlab-com/infrastructure/issues/1555>. An up to date list
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of proposed changes can be found at
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<https://gitlab.com/gitlab-com/infrastructure/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=database&label_name[]=change>.
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## Unicorn
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GitLab.com adjusts the memory limits for the [unicorn-worker-killer][unicorn-worker-killer] gem.
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Base default:
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- `memory_limit_min` = 750MiB
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- `memory_limit_max` = 1024MiB
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Web front-ends:
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- `memory_limit_min` = 1024MiB
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- `memory_limit_max` = 1280MiB
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## GitLab.com at scale
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In addition to the GitLab Enterprise Edition Omnibus install, GitLab.com uses
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the following applications and settings to achieve scale. All settings are
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located publicly available [chef cookbooks](https://gitlab.com/gitlab-cookbooks).
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### ELK
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We use Elasticsearch, logstash, and Kibana for part of our monitoring solution:
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- [gitlab-cookbooks / gitlab-elk · GitLab](https://gitlab.com/gitlab-cookbooks/gitlab-elk)
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- [gitlab-cookbooks / gitlab_elasticsearch · GitLab](https://gitlab.com/gitlab-cookbooks/gitlab_elasticsearch)
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### Prometheus
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Prometheus complete our monitoring stack:
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- [gitlab-cookbooks / gitlab-prometheus · GitLab](https://gitlab.com/gitlab-cookbooks/gitlab-prometheus)
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### Grafana
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For the visualization of monitoring data:
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- [gitlab-cookbooks / gitlab-grafana · GitLab](https://gitlab.com/gitlab-cookbooks/gitlab-grafana)
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### Sentry
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Open source error tracking:
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- [gitlab-cookbooks / gitlab-sentry · GitLab](https://gitlab.com/gitlab-cookbooks/gitlab-sentry)
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### Consul
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Service discovery:
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- [gitlab-cookbooks / gitlab_consul · GitLab](https://gitlab.com/gitlab-cookbooks/gitlab_consul)
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### Haproxy
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High Performance TCP/HTTP Load Balancer:
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- [gitlab-cookbooks / gitlab-haproxy · GitLab](https://gitlab.com/gitlab-cookbooks/gitlab-haproxy)
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[autoscale mode]: https://docs.gitlab.com/runner/configuration/autoscale.html "How Autoscale works"
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[runners-post]: https://about.gitlab.com/2016/04/05/shared-runners/ "Shared Runners on GitLab.com"
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[GitLab Runner]: https://gitlab.com/gitlab-org/gitlab-runner
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[altssh]: https://about.gitlab.com/2016/02/18/gitlab-dot-com-now-supports-an-alternate-git-plus-ssh-port/ "GitLab.com now supports an alternate git+ssh port"
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[GitLab Pages]: https://about.gitlab.com/features/pages "GitLab Pages"
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[docker in docker]: https://hub.docker.com/_/docker/ "Docker in Docker at DockerHub"
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[mailgun]: https://www.mailgun.com/ "Mailgun website"
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[sidekiq]: http://sidekiq.org/ "Sidekiq website"
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[unicorn-worker-killer]: https://rubygems.org/gems/unicorn-worker-killer "unicorn-worker-killer"
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[4010]: https://gitlab.com/gitlab-com/infrastructure/issues/4010 "Find a good value for maximum timeout for Shared Runners"
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[4070]: https://gitlab.com/gitlab-com/infrastructure/issues/4070 "Configure per-runner timeout for shared-runners-manager-X on GitLab.com"
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## Group and project settings
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On GitLab.com, projects, groups, and snippets created
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after July 2019 have the `Internal` visibility setting disabled.
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You can read more about the change in the
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[relevant issue](https://gitlab.com/gitlab-org/gitlab-ee/issues/12388).
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