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.
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