Continuous Delivery with Docker and Jenkins

The Docker push stage

When the image is ready, we can store it in the registry. The Docker push stage is very simple. It's enough to add the following code to Jenkinsfile:

stage("Docker push") {     steps {          sh "docker push leszko/calculator"     }}

If Docker registry has the access restricted, then first we need to log in using the docker login command. Needless to say, the credentials must be well secured, for example, using a dedicated credential store as described on the official Docker page: https://docs.docker.com/engine/reference/commandline/login/#credentials-store.

As always, pushing changes to the GitHub repository triggers Jenkins to start the build and, after a while, we should have the image automatically stored in the registry.