I’ve built a docker image containing a number of environment variables, including one called
SPARK_HOME. Here is the line from the Dockerfile that declares that env var:
When I issue
docker run I can see that the env var exists but any reference to it doesn’t return anything, as demonstrated in a simple
$ docker run --rm myimage /bin/bash -c "env | grep SPARK_HOME ; echo SPARK_HOME=$SPARK_HOME" SPARK_HOME=/opt/spark SPARK_HOME= $
Am I missing something obvious here? Why can I not refer to the value of an existing env var?