Unable to push docker image with fabric8 plugin - maven

Question

I'm unable to push a docker image to a private repository (hosted on https://hub.docker.com) with fabric8 plugin. I created on hub.docker a repository called: manuzid/heap-dump-sample. It's a simple Spring Boot app only with a loop in the main function. the interesting part is the following in the pom.xml:
<plugin>
<groupId>io.fabric8</groupId>
<artifactId>docker-maven-plugin</artifactId>
<version>0.27.2</version>
<configuration>
<registry>index.docker.io/v1</registry>
<!-- I think it's not necessary, plugin use the creds from docker config.json -->
<authConfig>
<username>user</username>
<password>pw</password>
</authConfig>
<images>
<image>
<name>manuzid/heap-dump-sample:%l</name>
<alias>${project.artifactId}</alias>
<build>
<from>greyfoxit/alpine-openjdk8</from>
<entryPoint>
<exec>
<arg>java</arg>
<arg>-jar</arg>
<arg>/opt/application/${project.artifactId}-${project.version}.jar</arg>
<arg>-XX:+HeapDumpOnOutOfMemoryError</arg>
<arg>-XX:HeapDumpPath=/dumps/oom.hprof</arg>
</exec>
</entryPoint>
<tags>
<tag>${project.version}</tag>
</tags>
<assembly>
<targetDir>/opt/application</targetDir>
<descriptorRef>artifact</descriptorRef>
</assembly>
<env>
<AB_ENABLED>jmx_exporter</AB_ENABLED>
</env>
</build>
<run>
<wait>
<log>Started HeapDumpSampleApplication</log>
<time>10000</time>
</wait>
<env>
<JAVA_OPTIONS>-Xmx64m</JAVA_OPTIONS>
</env>
<log>
<file>${project.build.directory}/heap-dump-sample.log</file>
</log>
</run>
</image>
</images>
</configuration>
<executions>
<execution>
<id>docker-build</id>
<phase>package</phase>
<goals>
<goal>build</goal>
</goals>
<configuration>
<filter>${project.artifactId}</filter>
</configuration>
</execution>
<execution>
<id>docker-push</id>
<phase>install</phase>
<goals>
<goal>push</goal>
</goals>
<configuration>
<filter>${project.artifactId}</filter>
</configuration>
</execution>
</executions>
</plugin>
I get the following error in the console: [ERROR] DOCKER> Unable to push 'manuzid/heap-dump-sample:latest' from registry 'index.docker.io/v1' : denied: requested access to the resource is denied [denied: requested access to the resource is denied ]
But the specified credentials are the same I use to log into the website (https://hub.docker.com). The specified registry url index.docker.io/v1 is obtained with the command docker info.
Any suggestions on this? Thanks in advance.
Edit: This example can be found here: https://github.com/ManuZiD/heap-dump-sample

Answer 1

I have had issues with both pulling and pushing images and through research which I cannot fully remember I was able to resolve this issue by modifying my Docker credentials store
Note executing docker login will create this file and also overwrite its contents (I suggest making a backup!)
The content of config.json should be something like:
{
"HttpHeaders": {
"User-Agent": "Docker-Client/19.03.12 (windows)"
},
"auths": {
"https://hub.docker.com/v1/": {
"auth": "AUTH-TOKEN"
},
"https://index.docker.io/v1/": {
"auth": "AUTH-TOKEN"
}
},
"credsStore": "desktop",
"stackOrchestrator": "swarm"
}
AUTH-TOKEN needs to contain base64{docker-user-id:docker-password}:
echo "docker-user-id:docker-password" | base64
Note this can be decoded using
echo AUTH-TOKEN | base64 -d
Warning Never share the contents of your config.json file!
This is my windows client credentials as you will notice from the user-agent details. OSX users may prefer to utlise an OSX key-chain