What is the 'resource_group' keyword and how does it prevent concurrent deployments?

The resource_group keyword ensures that only one job with the same resource group name runs at a time across all pipelines. This prevents concurrent deployments to the same environment, which can cause race conditions or configuration conflicts.

# Prevent concurrent deployments to production:
deploy-production:
  stage: deploy
  script:
    - ./deploy.sh production
  resource_group: production      # only one "production" deploy at a time
  environment: production

# Multiple environments, each serialized separately:
deploy-staging:
  script: ./deploy.sh staging
  resource_group: staging         # serializes staging deploys

deploy-production:
  script: ./deploy.sh production
  resource_group: production      # serializes production deploys separately

# Process mode (controls job ordering within the group):
deploy-job:
  resource_group: my-group
  process_mode: oldest_first      # FIFO - deploy in the order triggered
  # Options:
  # oldest_first (default): FIFO queue
  # newest_first: LIFO - skip old deploys, do most recent
  # unordered: no ordering guarantee

Why this matters: without resource groups, if two pipelines both have a deploy-to-production job and run at the same time, both deployment scripts could run concurrently, overwriting each other's changes or causing partial deployments.

Invest now in Acorns!!! 🚀
Join Acorns and get your $5 bonus!

Acorns is a micro-investing app that automatically invests your "spare change" from daily purchases into diversified, expert-built portfolios of ETFs. It is designed for beginners, allowing you to start investing with as little as $5. The service automates saving and investing. Disclosure: I may receive a referral bonus.

Invest now!!! Get Free equity stock (US, UK only)!

Use Robinhood app to invest in stocks. It is safe and secure. Use the Referral link to claim your free stock when you sign up!.

The Robinhood app makes it easy to trade stocks, crypto and more.

Webull! Receive free stock by signing up using the link: Webull signup.