Ricardo Martinelli de Oliveira created SPARK-23680:
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Summary: entrypoint.sh does not accept arbitrary UIDs, returning
as an error
Key: SPARK-23680
URL: https://issues.apache.org/jira/browse/SPARK-23680
Project: Spark
Issue Type: Bug
Components: Kubernetes
Affects Versions: 2.3.0
Environment: OpenShift
Reporter: Ricardo Martinelli de Oliveira
Openshift supports running pods using arbitrary UIDs
([https://docs.openshift.com/container-platform/3.7/creating_images/guidelines.html#openshift-specific-guidelines)]
to improve security. Although entrypoint.sh was developed to cover this
feature, the script is returning an error[1].
The issue is that the script uses getent to find the passwd entry of the
current UID, and if the entry is not found it creates an entry in /etc/passwd.
According to the getent man page:
{code:java}
EXIT STATUS
One of the following exit values can be returned by getent:
0 Command completed successfully.
1 Missing arguments, or database unknown.
2 One or more supplied key could not be found in the database.
3 Enumeration not supported on this database.
{code}
And since the script begin with a "set -ex" command, which means it turns on
debug and breaks the script if the command pipelines returns an exit code other
than 0.--
Having that said, this line below must be changed to remove the "-e" flag from
set command:
https://github.com/apache/spark/blob/v2.3.0/resource-managers/kubernetes/docker/src/main/dockerfiles/spark/entrypoint.sh#L20
[1]https://github.com/apache/spark/blob/v2.3.0/resource-managers/kubernetes/docker/src/main/dockerfiles/spark/entrypoint.sh#L25-L34
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