Guard gitlab jobs from multiple simultaneous executions
Guard Gitlab CI pipeline jobs from multiple parallel executions.
$ PRIVATE_TOKEN="$GITLAB_API_TOKEN" gitlab-job-guard $ my-unguarded-deployment-task --to=production
gitlab-job-guard will block if it detects other pipelines running for
the current project to avoid multiple pipelines from clobbering up a
deployment/environment. This is especially a problem when jobs are distributed
and picked up by multiple gitlab runners.
While gitlab will auto-cancel redundant, pending pipelines for the same branch
by default - this is not the case for multiple pipelines from different
branches targeting a particular deployment/environment. Gitlab has no way to
detect or control these user-defined branch-to-environment mappings and this
means environments can easily be left in an unsafe/broken state. (e.g.
terraform apply or
ansible, etc from different pipelines running at the same
gitlab-job-guard uses the Gitlab API to determine if existing pipelines are
scheduled and to backoff-and-retry until it is safe to proceed even if jobs are
distributed across multiple runners. Conflicts are detected by user-defined
matches on pipeline ref names (branch, tag, etc) and/or pipeline status.
The simplest use-case would likely be placing
gitlab-job-guard in a
before_script section in your
gitlab-ci.yml to protect all jobs (though this
can slow things down and be unfriendly to your local gitlab-ops).
$GITLAB_API_TOKENis a Personal Access Token with at minimum
before_script: - PRIVATE_TOKEN="$GITLAB_API_TOKEN" gitlab-job-guard
Though often, most pipelines only need to guard the critical jobs that share common state/data (i.e. a provisioning/deployment job, an artifact build/release job, etc).
deploy-production: stage: deploy script: - PRIVATE_TOKEN="$GITLAB_API_TOKEN" gitlab-job-guard - my-unguarded-deployment-task --to=production
e.g To guard something critical like a
terraform job running for a
provision-infrastructure: stage: provision script: - export PRIVATE_TOKEN="$GITLAB_API_TOKEN" - gitlab-job-guard --guard-ref-regex='^v[0-9\.]+' # Regex matches tags - terraform plan ... - terraform apply ... only: - tags
--guard-ref-regex takes a regular expression to detect conflicts on other
pipelines whose ref name (branch, tag) is a (partial) match. This allows for
guarding of jobs in the complex use-cases.
To hold jobs for a collisions on pattern matches on the branch/tag names.
gitlab-job-guard -c=^master$ # Match branch names matching 'master' exactly gitlab-job-guard -c=^(master|dev(elop)?)$ # Match any of the mainline branches gitlab-job-guard -c=^(feature|release|hotfix)/ # Match any gitflow transient branch prefixes gitlab-job-guard -c=^[0-9]\- # Match branch names beginning with a number # and dash ignoring all other text. # e.g. a gitlab branch made from an issue gitlab-job-guard -c=^v?[\d.]+$ # Match (semver) tags like v1.0.9, 2.0 gitlab-job-guard -c=^environment/ # Match any environment deployments? gitlab-job-guard -c=^environment/dc1.+ # Match environment deployments to DC1? gitlab-job-guard -c="$CI_BUILD_REF_NAME" # Match current branch name (partially). # i.e. 'master' matches 'feature/master-document' gitlab-job-guard -c="^$CI_BUILD_REF_NAME$" # Match current branch name (exactly). # i.e. 'master' does not match 'master-deployment' gitlab-job-guard -c='.+' -s='running|pending' # Match any pipeline in running or pending state
To hold a job for a collision on part of the ref name (e.g. on branch prefix
release/, etc a la
# Assuming current pipeline is for the 'feature/foo' branch and that # CI_BUILD_REF_NAME=feature/foo # Extract the branch prefix CI_BUILD_REF_PREFIX=$(echo "$CI_BUILD_REF_NAME" | sed -r 's@(.+/)(.+)@\1@') # CI_BUILD_REF_PREFIX now contains 'feature/' # This will now block if there are any other pipelines running or pending # for feature/ branches. gitlab-job-guard -c="^$CI_BUILD_REF_PREFIX" -s='running|pending'
gitlab-job-guard reads in the following environment variables
to compose its arguments. NOTE: environment variables take precedence
over arguments passed at the CLI and so only the
arguments/envvars need to be set. Setting these as protected environment
leaking sensitive information and needing to duplicate them for every call.
envvar | argument | source ------------------- --------------------- ---------------- GUARD_REF_REGEX | --guard-ref-regex | user specified GUARD_STATUS_REGEX | --guard-status-regex | user specified PRIVATE_TOKEN | --private-token | user specified GUARD_TIMEOUT | --guard-timeout | user specified CI_PROJECT_ID | --ci-project-id | runner environment CI_BUILD_REF_NAME | --ci-build-ref-name | runner environment CI_API_V4_URL | --ci-api-v4-url | runner environment CI_PIPELINE_ID | --ci-pipeline-id | runner environment
gitlab-job-guard -h for the full argument set and current/default values.
gitlab-job-guard will backoff-and-retry until it is safe to proceed or a
timeout is reached. An exit code of
0 indicates no other pipelines conflict
and that the job can continue. On reaching the timeout (
1 hour by default to
align with the default timeout for gitlab jobs), it will return an error to fail
the job. The timeout in seconds can be set via
If a fail-fast approach is needed, the
-x/--no-wait flag will cause
gitlab-job-guard to exit immediately on conflicts. (Though, this means the
pipeline run will have to be restarted some other way or abandoned).
For long-running pipelines, this solution can have subtle consequences with growing queues and increased contention and unpredictability as to which pipeline is the first-past-the-post. An older pipeline taking precedence over newer commits if often not desired and newer pipelines always winning is probably desired.
- Handle existing conflicting pipelines - cancel them or give-way.
- Narrow down conflicts to jobs (
CI_JOB_NAME) or stages (
CI_JOB_STAGE) so that other parts of the pipelines that do not share state are allowed to run freely.
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
|Filename, size||File type||Python version||Upload date||Hashes|
|Filename, size gitlab_job_guard-0.0.4.3-py2.py3-none-any.whl (21.0 kB)||File type Wheel||Python version py2.py3||Upload date||Hashes View|
|Filename, size gitlab-job-guard-0.0.4.3.tar.gz (11.8 kB)||File type Source||Python version None||Upload date||Hashes View|
Hashes for gitlab_job_guard-0.0.4.3-py2.py3-none-any.whl