Docker run command with environment variables

Question

I'm trying to launch a docker container that will execute a command like this:

docker run --net="host" -it --entrypoint bash $KAFKA_DOCKER_IMAGE "\$KAFKA_HOME/bin/kafka-topics.sh --create --zookeeper localhost:2181 --topic $1 --partitions $num_partitions --replication-factor $replication_factor"

Where $KAFKA_DOCKER_IMAGE, $replication_factor and $num_partitions are variables defined in a script that I'm using to execute this command. And $KAFKA_HOME is an environment variable that is already defined in the docker image.

My problem is that the command that is being executed on the container is the following:

$KAFKA_HOME/bin/kafka-topics.sh --create --zookeeper localhost:2181 --topic popota --partitions 1 --replication-factor 1

It doesn't expand the $KAFKA_HOME. How can I do this?

DaveH · Accepted Answer · 2016-07-22 10:04:58Z

3

I think you have to supply the environment variables using the -e flag

https://docs.docker.com/engine/reference/run/#env-environment-variables

answered Jul 22, 2016 at 10:04

DaveH

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luis.alves Over a year ago

The variable is already defined in the dockerfile. See here github.com/spotify/docker-kafka/blob/master/kafka/Dockerfile

luis.alves · Accepted Answer · 2016-07-22 10:21:53Z

2

I found the solution:

docker run --net="host" -it --entrypoint bash $KAFKA_DOCKER_IMAGE -c "\$KAFKA_HOME/bin/kafka-topics.sh --create --zookeeper localhost:2181 --topic $1 --partitions $num_partitions --replication-factor $replication_factor"

answered Jul 22, 2016 at 10:21

luis.alves

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