cloud_native_hw4

Build Docker Image

docker build -t [name_of_image] .

• please replace name_of_image to your desired docker image name

Run the Built Docker Image (in detached mode and expose port 3000)

docker run -dp 3000:3000 [name_of_image]

Other useful flags:

• -d: run container in detached mode
• -p [host_port]:[container_port]: expose container port to host port
• -i: attach container STDIN
• -t: attach container STDOUT
• --name [name]: name the container
• --rm: delete the container on shut down

or directly run the image from Docker Repo

docker run -dp 3000:3000 cl1224/2025cloud

How is container image created and tagged?

1. Trigger – A push to main (or a manual workflow_dispatch) starts a single workflow run
2. build-image job
   • Checks out the code, sets up QEMU/Buildx, and builds the Docker image locally with the temporary tag 2025cloud:ci
   • Instead of pushing, it exports the image as a tarball /tmp/2025cloud.tar and uploads it as the artifact 2025cloud-image.
3. push-image job (require success from build-image)
   • Downloads that artifact, docker loads the tarball back into the engine.
   • Re-tags the image twice:
     • USERNAME/2025cloud:latest: latest image will be always from the most recent build
     • USERNAME/2025cloud:<commit SHA>: commit-specific image
   • Logs in with the Docker Hub secrets and docker push --all-tags so both tags land in your registry.