![]() Note that you don’t need a large image with all the development dependencies to run your application in production. Instead, it uses a Java Runtime Environment image. The second interesting point is that this step doesn’t take the base target or a JDK image as reference. => => naming to docker.io/library/java-docker => CACHED COPY -from =build /app/target/spring-petclinic- *.jar /spring-petclinic.jar => load metadata for docker.io/library/openjdk:16-alpine3.13 => load metadata for docker.io/library/openjdk:11-jre-slim Setting up a GitHub Actions file to store the latest commit as an image in the GitHub registryįirst, let us modify our existing GitHub workflow to only push to Hub if there’s a particular tag.Modifying the GitHub workflow to only push commits with specific tags to Docker Hub.By doing this, you can always test what is latest while reserving your tagged versions for release to Docker Hub. You can consider this approach to have your commits go to a local registry to then use in nightly tests. This means, only specific versions are pushed, instead of every commit updating the latest version on Docker Hub. We can do this by adding the ability to have tagged versions behave differently to all commits to master. Let’s now look at how we can improve it further. Push tagged versions to Docker HubĮarlier, we learnt how to set up a GitHub Actions workflow to a Docker project, how to optimize the workflow by setting up a builder with build cache. Now, run the workflow again and verify that it uses the build cache. Steps : - name : Check Out Repo uses : - name : Login to Docker Hub uses : with : username : $ Click set up a workflow yourself and add the following content:.Go to your repository in GitHub and then click Actions > New workflow.Lastly, we’ll echo the image digest to see what was pushed. We’ll then add a tag to specify to always go to the latest version. In this example, let us set the push flag to true as we also want to push. The second one is the build and push action.The first action enables us to log in to Docker Hub using the secrets we stored in the GitHub Repository. ![]() We can achieve this by creating two Docker actions: Now, let’s set up our GitHub Actions workflow to build and store our images in Hub. In the previous section, we created a PAT and added it to GitHub to ensure we can access Docker Hub from any workflow. Now, add this Personal Access Token (PAT) as a second secret into the GitHub secrets UI with the name DOCKER_HUB_ACCESS_TOKEN. To create a new token, go to Docker Hub Settings and then click New Access Token. Navigate to your GitHub repository and click Settings > Secrets > New secret.Ĭreate a new secret with the name DOCKER_HUB_USERNAME and your Docker ID as value.Ĭreate a new Personal Access Token (PAT). To do this:Īdd your Docker ID as a secret to GitHub. You can either clone this repository, or use your own Docker project.īefore we start, ensure you can access Docker Hub from any workflows you create. The SimpleWhaleDemo repository contains an Nginx alpine image. This guide uses a simple Docker project as an example. Optimize your image using multi-stage builds.Push only specific versions to Docker Hub.Optimize your workflow to reduce the number of pull requests and the total build time.Use a sample Docker project as an example to configure GitHub Actions.This guide contains instructions on how to: ![]() Before setting up a new pipeline, we recommend that you take a look at Ben’s blog on CI/CD best practices. This page guides you through the process of setting up a GitHub Action CI/CD pipeline with Docker containers.
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