Rob Vesse created SPARK-26685:
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Summary: Building Spark Images with latest Docker does not honour
spark_uid build argument
Key: SPARK-26685
URL: https://issues.apache.org/jira/browse/SPARK-26685
Project: Spark
Issue Type: Improvement
Components: Kubernetes
Affects Versions: 2.4.0
Reporter: Rob Vesse
Latest Docker releases are stricter in their interpretation of the scope of
build arguments meaning the location of the {{ARG spark_uid}} declaration puts
it out of scope by the time the variable is consumed resulting in the Python
and R images still running as {{root}} regardless of what the user may have
specified as the desired UID.
e.g. Images built with {{-u 456}} provided to {{bin/docker-image-tool.sh}}
{noformat}
> docker run -it --entrypoint /bin/bash rvesse/spark-py:uid456
bash-4.4# whoami
root
bash-4.4# id -u
0
bash-4.4# exit
> docker run -it --entrypoint /bin/bash rvesse/spark:uid456
bash-4.4$ id -u
456
bash-4.4$ exit
{noformat}
Note that for the Python image the build argument was out of scope and ignored.
For the base image the {{ARG}} declaration is in an in-scope location and so
is honoured correctly.
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