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url: https://learning.oreilly.com/library/view/hands-on-github-actions/9781484264645/html/502534_1_En_8_Chapter.xhtml
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<meta data-react-helmet=true property=og:image content=https://learning.oreilly.com/covers/urn:orm:book:9781484264645/><meta data-react-helmet=true name=twitter:image content=https://learning.oreilly.com/covers/urn:orm:book:9781484264645/><meta data-react-helmet=true name=twitter:card content=summary><meta data-react-helmet=true name=twitter:creator content=@OReillyMedia><meta data-react-helmet=true name=twitter:site content=@OReillyMedia><meta data-react-helmet=true name=twitter:title content="O'Reilly Media - Technology and Business Training"><meta data-react-helmet=true property=twitter:account_id content=4503599627559754><meta data-react-helmet=true property=og:site_name content="O'Reilly Online Learning"><meta data-react-helmet=true name=publisher content=Apress><meta data-react-helmet=true property=og:book:author itemprop=author content="Chaminda Chandrasekara"><meta data-react-helmet=true property=og:book:author itemprop=author content="Pushpa Herath"><meta data-react-helmet=true property=og:type content=book><meta data-react-helmet=true property=og:book:isbn itemprop=isbn content=9781484264645>
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<title>8. Service Containers | Hands-on GitHub Actions: Implement CI/CD with GitHub Action Workflows for Your Applications</title>
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</span>You need to ensure that the service container is created and the ports are mapped to the host (the runner machine) to allow the workflow to directly communicate with a Redis service container.<div class=ProgramCode id=PC6><div class=LineGroup><div class=FixedLine>jobs:</div><div class=FixedLine> # Name of the job running in the runner directly</div><div class=FixedLine> runner-job:</div><div class=FixedLine> # Must use a Linux environment to use service containers</div><div class=FixedLine> runs-on: ubuntu-latest</div></div><div class=LineGroup><div class=FixedLine> # Service containers running in the `runner-job`</div><div class=FixedLine> services:</div><div class=FixedLine> # service container name</div><div class=FixedLine> redis:</div><div class=FixedLine> # Docker Hub Redis docker image</div><div class=FixedLine> image: redis</div><div class=FixedLine> # health checks to wait until redis is ready</div><div class=FixedLine> options: >-</div><div class=FixedLine> --health-cmd "redis-cli ping"</div><div class=FixedLine> --health-interval 10s</div><div class=FixedLine> --health-timeout 5s</div><div class=FixedLine> --health-retries 5</div><div class=FixedLine> ports:</div><div class=FixedLine> # Mapping port 6379 on service container to the host (runner machine)</div><div class=FixedLine> # to enable the job to access the Redis service container</div><div class=FixedLine> - 6379:6379</div></div></div></div><div class=Para id=Par22>Next, instead of using the Redis container service label (name), you must use a localhost mapped port to communicate with the Redis service container while running the JavaScript directly in the runner machine. Therefore, connection information to the Redis service container must be set up, as shown next.<div class=ProgramCode id=PC7><div class=LineGroup><div class=FixedLine>- name: Connect to Redis</div><div class=FixedLine> # Runs JavaScript to create a Redis client, populate data and read data</div><div class=FixedLine> run: node redisclient.js</div><div class=FixedLine> # Environment variable are passed to JavaScript to create Redis client</div><div class=FixedLine> env:</div><div class=FixedLine> # now need to access Redis service container via localhost as port is mapped to runner machine</div><div class=FixedLine> # and the job and Redis service container communication is no longer container to container</div><div class=FixedLine> REDIS_HOST: localhost</div><div class=FixedLine> # The default Redis port is passed to create the Redis client</div><div class=FixedLine> REDIS_PORT: 6379</div></div></div></div><div class=Para id=Par23>The following is the full workflow of using a Redis service container while running a job directly on a runner machine.<div class=ProgramCode id=PC8><div class=LineGroup><div class=FixedLine>on: [workflow_dispatch]</div></div><div class=LineGroup><div class=FixedLin
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