Unknown host maven2: Name or service not known when building maven in docker

I’m trying to launch mvn clean install inside a docker and I keep getting error:

`Downloading from foo: http://maven2:8081/repository/foo/org/apache/maven/plugins/maven-clean-plugin/2.5/maven-clean-plugin-2.5.pom
[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  0.239 s
[INFO] Finished at: 2020-10-06T13:27:37Z
[INFO] ------------------------------------------------------------------------
[ERROR] Plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-clean-plugin:jar:2.5: Could not transfer artifact org.apache.maven.plugins:maven-clean-plugin:pom:2.5 from/to foo (http://maven2:8081/repository/foo/): Transfer failed for http://maven2:8081/repository/foo/org/apache/maven/plugins/maven-clean-plugin/2.5/maven-clean-plugin-2.5.pom: Unknown host maven2: Name or service not known -> [Help 1]`

I’m using companies local maven. The settings file is:

<?xml version="1.0" encoding="UTF-8"?>
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" 
      <!--This sends everything else to /public -->
      <!--Enable snapshots for the built in central repo to direct -->
      <!--all requests to nexus via the mirror -->
    <!--make the profile active all the time -->

If I delete settings.xml or setup redirects to central

    <name>Https Mirror Repository</name>

the program builds without a problem, but script that generates the product fails the second it needs to download something that is stored on our nexus.

All the requests to maven2 seem to be valid. If I use browser or wget to access the http://maven2:8081/repository/foo/org/apache/maven/plugins/maven-clean-plugin/2.5/maven-clean-plugin-2.5.pom I get it without any problem.

maven version:

[email protected]:/mnt# mvn -version
Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)
Maven home: /opt/apache-maven
Java version: 1.8.0_265, vendor: Oracle Corporation, runtime: /usr/lib/jvm/java-8-openjdk-amd64/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "4.19.128-microsoft-standard", arch: "amd64", family: "unix"

Other people also use the same docker image and settings file and it seems to be working for them.

I also tried removeing /repository from /.m2/
relaunching the image
and like >50 different solutions on stack overflow in a course of few days and nothing seems to work

Source: Docker Questions