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To address this issue, and avoid changing the ONAP provided settings.xml, one may use the following directive
in the configuration section of the fabric8 docker-maven-plugin
<pullRegistry>${docker.pull.registry}</pullRegistry>

and set the docker.pull.registry variable when invoking maven, e.g.
> mvn install -Pdocker -Ddocker.pull.registry=docker.io

Push Repo

In order to test the maven lifecycle to push images, a developer must instantiate a local docker registry,
configure the pom appropriately, and invoke mvn appropriately.

Start a local docker image repo:
see: https://docs.docker.com/registry/deploying/
> docker run -d -p 5000:5000 --restart=always --name registry registry:2

Add the following directive in the configuration section of the fabric8 docker-maven-plugin
<pushRegistry>${docker.push.registry}</pushRegistry>

and set the docker.push.registry variable when invoking maven, e.g.
> mvn install -Pdocker -Ddocker.push.registry=localhost:5000 docker:push
Note invocation of docker:deploy lifecycle

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Notes:

1) alpine images use sh rather then bash. Some side-effects
- In Dockerfile, CMD and ENTRYPOINT
bash - ENTRYPOINT ["startup.sh"]
sh - ENTRYPOINT ["sh", "startup.sh"]

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