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GitLab.com settings
In this page you will find information about the settings that are used on GitLab.com.
SSH host keys fingerprints
Below are the fingerprints for GitLab.com's SSH host keys.
Algorithm | MD5 | SHA256 |
---|---|---|
DSA | 7a:47:81:3a:ee:89:89:64:33:ca:44:52:3d:30:d4:87 |
p8vZBUOR0XQz6sYiaWSMLmh0t9i8srqYKool/Xfdfqw |
ECDSA | f1:d0:fb:46:73:7a:70:92:5a:ab:5d:ef:43:e2:1c:35 |
HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw |
ED25519 | 2e:65:6a:c8:cf:bf:b2:8b:9a:bd:6d:9f:11:5c:12:16 |
eUXGGm1YGsMAS7vkcx6JOJdOGHPem5gQp4taiCfCLB8 |
RSA | b6:03:0e:39:97:9e:d0:e7:24:ce:a3:77:3e:01:42:09 |
ROQFvPThGrW4RuWLoL9tq9I9zJ42fK4XywyRtbOz/EQ |
Mail configuration
GitLab.com sends emails from the mg.gitlab.com
domain via Mailgun and has
its own dedicated IP address (198.61.254.240
).
Alternative SSH port
GitLab.com can be reached via a different SSH port for git+ssh
.
Setting | Value |
---|---|
Hostname |
altssh.gitlab.com |
Port |
443 |
An example ~/.ssh/config
is the following:
Host gitlab.com
Hostname altssh.gitlab.com
User git
Port 443
PreferredAuthentications publickey
IdentityFile ~/.ssh/gitlab
GitLab Pages
Below are the settings for GitLab Pages.
Setting | GitLab.com | Default |
---|---|---|
Domain name | gitlab.io |
- |
IP address | 35.185.44.232 |
- |
Custom domains support | yes | no |
TLS certificates support | yes | no |
The maximum size of your Pages site is regulated by the artifacts maximum size which is part of GitLab CI/CD.
GitLab CI/CD
Below are the current settings regarding GitLab CI/CD.
Setting | GitLab.com | Default |
---|---|---|
Artifacts maximum size | 1G | 100M |
Artifacts expiry time | kept forever | deleted after 30 days unless otherwise specified |
Repository size limit
The maximum size your Git repository is allowed to be, including LFS. If you are near or over the size limit, you can reduce your repository size with Git.
Setting | GitLab.com | Default |
---|---|---|
Repository size including LFS | 10G | Unlimited |
IP range
GitLab.com, CI/CD, and related services are deployed into Google Cloud Platform (GCP). Any IP based firewall can be configured by looking up all IP address ranges or CIDR blocks for GCP.
Static endpoints are being considered.
Shared Runners
Shared Runners on GitLab.com run in autoscale mode and powered by Google Cloud Platform. Autoscaling means reduced waiting times to spin up CI/CD jobs, and isolated VMs for each project, thus maximizing security. They're free to use for public open source projects and limited to 2000 CI minutes per month per group for private projects. Read about all GitLab.com plans.
All your CI/CD jobs run on n1-standard-1 instances with 3.75GB of RAM, CoreOS and the latest Docker Engine installed. Instances provide 1 vCPU and 25GB of HDD disk space. The default region of the VMs is US East1. 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.
Jobs handled by the shared Runners on GitLab.com (shared-runners-manager-X.gitlab.com
),
will be timed out after 3 hours, regardless of the timeout configured in a
project. Check the issues 4010 and 4070 for the reference.
Below are the shared Runners settings.
Setting | GitLab.com | Default |
---|---|---|
GitLab Runner | Runner versions dashboard | - |
Executor | docker+machine |
- |
Default Docker image | ruby:2.5 |
- |
privileged (run Docker in Docker) |
true |
false |
config.toml
The full contents of our config.toml
are:
DigitalOcean
concurrent = X
check_interval = 1
metrics_server = "X"
sentry_dsn = "X"
[[runners]]
name = "docker-auto-scale"
request_concurrency = X
url = "https://gitlab.com/"
token = "SHARED_RUNNER_TOKEN"
executor = "docker+machine"
environment = [
"DOCKER_DRIVER=overlay2"
]
limit = X
[runners.docker]
image = "ruby:2.5"
privileged = true
[runners.machine]
IdleCount = 20
IdleTime = 1800
OffPeakPeriods = ["* * * * * sat,sun *"]
OffPeakTimezone = "UTC"
OffPeakIdleCount = 5
OffPeakIdleTime = 1800
MaxBuilds = 1
MachineName = "srm-%s"
MachineDriver = "digitalocean"
MachineOptions = [
"digitalocean-image=X",
"digitalocean-ssh-user=core",
"digitalocean-region=nyc1",
"digitalocean-size=s-2vcpu-2gb",
"digitalocean-private-networking",
"digitalocean-tags=shared_runners,gitlab_com",
"engine-registry-mirror=http://INTERNAL_IP_OF_OUR_REGISTRY_MIRROR",
"digitalocean-access-token=DIGITAL_OCEAN_ACCESS_TOKEN",
]
[runners.cache]
Type = "s3"
BucketName = "runner"
Insecure = true
Shared = true
ServerAddress = "INTERNAL_IP_OF_OUR_CACHE_SERVER"
AccessKey = "ACCESS_KEY"
SecretKey = "ACCESS_SECRET_KEY"
Google Cloud Platform
concurrent = X
check_interval = 1
metrics_server = "X"
sentry_dsn = "X"
[[runners]]
name = "docker-auto-scale"
request_concurrency = X
url = "https://gitlab.com/"
token = "SHARED_RUNNER_TOKEN"
executor = "docker+machine"
environment = [
"DOCKER_DRIVER=overlay2"
]
limit = X
[runners.docker]
image = "ruby:2.5"
privileged = true
[runners.machine]
IdleCount = 20
IdleTime = 1800
OffPeakPeriods = ["* * * * * sat,sun *"]
OffPeakTimezone = "UTC"
OffPeakIdleCount = 5
OffPeakIdleTime = 1800
MaxBuilds = 1
MachineName = "srm-%s"
MachineDriver = "google"
MachineOptions = [
"google-project=PROJECT",
"google-disk-size=25",
"google-machine-type=n1-standard-1",
"google-username=core",
"google-tags=gitlab-com,srm",
"google-use-internal-ip",
"google-zone=us-east1-d",
"google-machine-image=PROJECT/global/images/IMAGE",
"engine-registry-mirror=http://INTERNAL_IP_OF_OUR_REGISTRY_MIRROR"
]
[runners.cache]
Type = "s3"
BucketName = "runner"
Insecure = true
Shared = true
ServerAddress = "INTERNAL_IP_OF_OUR_CACHE_SERVER"
AccessKey = "ACCESS_KEY"
SecretKey = "ACCESS_SECRET_KEY"
Sidekiq
GitLab.com runs Sidekiq with arguments --timeout=4 --concurrency=4
and the following environment variables:
Setting | GitLab.com | Default |
---|---|---|
SIDEKIQ_MEMORY_KILLER_MAX_RSS |
1000000 |
1000000 |
SIDEKIQ_MEMORY_KILLER_SHUTDOWN_SIGNAL |
SIGKILL |
- |
SIDEKIQ_LOG_ARGUMENTS |
1 |
- |
Cron jobs
Periodically executed jobs by Sidekiq, to self-heal GitLab, do external synchronizations, run scheduled pipelines, etc.:
Setting | GitLab.com | Default |
---|---|---|
pipeline_schedule_worker |
19 * * * * |
19 * * * * |
PostgreSQL
GitLab.com being a fairly large installation of GitLab means we have changed various PostgreSQL settings to better suit our needs. For example, we use streaming replication and servers in hot-standby mode to balance queries across different database servers.
The list of GitLab.com specific settings (and their defaults) is as follows:
Setting | GitLab.com | Default |
---|---|---|
archive_command | /usr/bin/envdir /etc/wal-e.d/env /opt/wal-e/bin/wal-e wal-push %p |
empty |
archive_mode | on | off |
autovacuum_analyze_scale_factor | 0.01 | 0.01 |
autovacuum_max_workers | 6 | 3 |
autovacuum_vacuum_cost_limit | 1000 | -1 |
autovacuum_vacuum_scale_factor | 0.01 | 0.02 |
checkpoint_completion_target | 0.7 | 0.9 |
checkpoint_segments | 32 | 10 |
effective_cache_size | 338688MB | Based on how much memory is available |
hot_standby | on | off |
hot_standby_feedback | on | off |
log_autovacuum_min_duration | 0 | -1 |
log_checkpoints | on | off |
log_line_prefix | %t [%p]: [%l-1] |
empty |
log_min_duration_statement | 1000 | -1 |
log_temp_files | 0 | -1 |
maintenance_work_mem | 2048MB | 16 MB |
max_replication_slots | 5 | 0 |
max_wal_senders | 32 | 0 |
max_wal_size | 5GB | 1GB |
shared_buffers | 112896MB | Based on how much memory is available |
shared_preload_libraries | pg_stat_statements | empty |
shmall | 30146560 | Based on the server's capabilities |
shmmax | 123480309760 | Based on the server's capabilities |
wal_buffers | 16MB | -1 |
wal_keep_segments | 512 | 10 |
wal_level | replica | minimal |
statement_timeout | 15s | 60s |
idle_in_transaction_session_timeout | 60s | 60s |
Some of these settings are in the process being adjusted. For example, the value
for shared_buffers
is quite high and as such we are looking into adjusting it.
More information on this particular change can be found at
https://gitlab.com/gitlab-com/infrastructure/issues/1555. An up to date list
of proposed changes can be found at
https://gitlab.com/gitlab-com/infrastructure/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=database&label_name[]=change.
Unicorn
GitLab.com adjusts the memory limits for the unicorn-worker-killer gem.
Base default:
memory_limit_min
= 750MiBmemory_limit_max
= 1024MiB
Web front-ends:
memory_limit_min
= 1024MiBmemory_limit_max
= 1280MiB
GitLab.com-specific rate limits
NOTE: Note: See Rate limits for administrator documentation.
IP blocks usually happen when GitLab.com receives unusual traffic from a single IP address that the system views as potentially malicious based on rate limit settings. After the unusual traffic ceases, the IP address will be automatically released depending on the type of block, as described below.
If you receive a 403 Forbidden
error for all requests to GitLab.com, please
check for any automated processes that may be triggering a block. For
assistance, contact GitLab Support
with details, such as the affected IP address.
HAProxy API throttle
GitLab.com responds with HTTP status code 429
to API requests that exceed 10
requests
per second per IP address.
The following example headers are included for all API requests:
RateLimit-Limit: 600
RateLimit-Observed: 6
RateLimit-Remaining: 594
RateLimit-Reset: 1563325137
RateLimit-ResetTime: Wed, 17 Jul 2019 00:58:57 GMT
Source:
- Search for
rate_limit_http_rate_per_minute
andrate_limit_sessions_per_second
in GitLab.com's current HAProxy settings.
Rack Attack initializer
Details of rate limits enforced by Rack Attack.
Protected paths throttle
GitLab.com responds with HTTP status code 429
to POST requests at protected
paths that exceed 10 requests per minute per IP address.
See the source below for which paths are protected. This includes user creation, user confirmation, user sign in, and password reset.
This header is included in responses to blocked requests:
Retry-After: 60
Source:
- Search for
rate_limit_requests_per_period
,rate_limit_period
, andrack_attack_protected_paths
in GitLab.com's current Rails app settings.
Git and container registry failed authentication ban
GitLab.com responds with HTTP status code 403 for 1 hour, if 30 failed authentication requests were received in a 3-minute period from a single IP address.
This applies only to Git requests and container registry (/jwt/auth
) requests
(combined).
This limit is reset by requests that authenticate successfully. For example, 29 failed authentication requests followed by 1 successful request, followed by 29 more failed authentication requests would not trigger a ban.
No response headers are provided.
Admin Area settings
GitLab.com does not currently use these settings.
GitLab.com at scale
In addition to the GitLab Enterprise Edition Omnibus install, GitLab.com uses the following applications and settings to achieve scale. All settings are located publicly available chef cookbooks.
ELK
We use Elasticsearch, logstash, and Kibana for part of our monitoring solution:
Prometheus
Prometheus complete our monitoring stack:
Grafana
For the visualization of monitoring data:
Sentry
Open source error tracking:
Consul
Service discovery:
Haproxy
High Performance TCP/HTTP Load Balancer:
Group and project settings
On GitLab.com, projects, groups, and snippets created
after July 2019 have the Internal
visibility setting disabled.
You can read more about the change in the relevant issue.