How to make a local docker build?

[matthijskooijman]

I'm trying to build the (docker container for) FROST-Server locally, but am have not been able to so far. I've jumped a few hoops, but not working yet. Because I do not have a local java/maven setup (and maven seems to be missing from Ubuntu by now), I'm trying to run maven (and the build) in docker, which seems to work, but at some point the build fails.

Do you have any working setup you use for local builds that you can share?

This is what I've been trying now:

❯ cat maven-in-docker 
#!/bin/sh

exec docker run -it --rm --name maven-frost -v "$(pwd)":/usr/src/mymaven -v "$(pwd)/maven-m2-dir":/root/.m2  -w /usr/src/mymaven maven:3-sapmachine-21 mvn "$@"

❯ cat docker-build 
#!/bin/sh -e

# Below is based on the maven-deploy.yml github workflow 

alias mvn=./maven-in-docker

mvn -B deploy -P release -Dgpg.skip

export HTTP_NAME=$(mvn -pl FROST-Server.HTTP -Dexec.executable='echo' -Dexec.args='${project.build.finalName}' exec:exec -q)
export MQTTP_NAME=$(mvn -pl FROST-Server.MQTTP -Dexec.executable='echo' -Dexec.args='${project.build.finalName}' exec:exec -q)
export MQTT_NAME=$(mvn -pl FROST-Server.MQTT -Dexec.executable='echo' -Dexec.args='${project.build.finalName}' exec:exec -q)
export HTTP_ARTIFACT=${HTTP_NAME}.war
export MQTTP_ARTIFACT=${MQTTP_NAME}.war
export MQTT_ARTIFACT=${MQTT_NAME}-jar-with-dependencies.jar

ARTIFACT_FILE=$MQTTP_ARTIFACT docker build -f FROST-Server.MQTTP -t fraunhoferiosb/frost-server:local

But the maven deploy fails with a ton of errors (though it seems to be errors during test, maybe I can skip tests...).

The reason for wanting this was originally to take a stab at fixing #2142, but I just noticed that was already fixed in 2.7.0-snapshot, so I can actually go ahead and just a ready-built image for now (but I suspect I might be running into other issues to debug/fix later, so having a working build setup would be nice).

[matthijskooijman]

Ah, seems adding -DskipTests has helped to further the build along, but now it seems to fail at uploading builds somewhere:

[ERROR] Failed to execute goal org.sonatype.plugins:nexus-staging-maven-plugin:1.7.0:deploy (injected-nexus-deploy) on project FROST-Server.Tests: Failed to deploy artifacts: Could not transfer artifact de.fraunhofer.iosb.ilt.FROST-Server:FROST-Server.MQTT:jar:jar-with-dependencies:2.6.0-20250910.144443-1 from/to ossrh (https://oss.sonatype.org/content/repositories/snapshots): Broken pipe -> [Help 1]

Should I maybe not use deploy but some other target? Can this work at all without uploading results somewhere?

[hylkevds]

You should just do a mvn install, since the deploy tries to deploy the jars/wars to maven central, and that's not what you want. The install target only copies the artefacts into the local maven cache.
Using -DskipTests will make the build a lot faster, though should not be needed. If there is a build failure, can you make an issue for that please?

After the compile, you can then build the docker images separately with docker. For example:

cd FROST-Server.HTTP
docker buildx build . --build-arg ARTIFACT_FILE=FROST-Server.HTTP-2.7.0-SNAPSHOT.war

The other docker images are in FROST-Server.MQTT and FROST-Server.MQTTP

[hylkevds]

Note that for #2142 I already have a prototype in the develop-jsonMetadata branch. That needs some more testing though, especially the database conversion.

[matthijskooijman]

Thanks, will try that tomorrow or next week, thanks! Also looks like your docker build command will actually work, unlike mine :-)

Note that for #2142 I already have a prototype in the develop-jsonMetadata branch. That needs some more testing though, especially the database conversion.

Oh, did not see that it was still in a separate branch, but I see there are images for that branch on docker hub already, so I should be able to just run that. Will report what I find!