CODEWITHSUNDEEP
dockerdockerfile
el323
el323

Reputation: 2920

Dockerfile RUN command

I want to execute the following command in my dockerfile:

java -jar kafka-connect-cli-1.0.6-all.jar create cassandra-sink-orders < cassandra-sink-distributed-orders.properties

This is what I have tried but it gives me error:

Cannot execute cassandra-sink-orders < cassandra-sink-distributed-orders.properties

CMD ["java", "-jar", "kafka-connect-cli-1.0.6-all.jar", "create", "cassandra-sink-orders", "<", "cassandra-sink-distributed-orders.properties"]

Upvotes: 0

Views: 129

Answers (2)

Daniel Taub
Daniel Taub

Reputation: 5389

You can also run it in this way : 

CMD "java -jar kafka-connect-cli-1.0.6-all.jar create cassandra-sink-orders < cassandra-sink-distributed-orders.properties"

Upvotes: 0

helmbert
helmbert

Reputation: 38024

Output redirection using < is a shell feature. When supplying a JSON list to CMD, the command will not be executed by a shell.

To use shell feature, use one of the following forms:

CMD ["sh", "-c", "java -jar kafka-connect-cli-1.0.6-all.jar create cassandra-sink-orders < cassandra-sink-distributed-orders.properties"]
CMD java -jar kafka-connect-cli-1.0.6-all.jar create cassandra-sink-orders < cassandra-sink-distributed-orders.properties

From the documentation:

The CMD instruction has three forms:

  • CMD ["executable","param1","param2"] (exec form, this is the preferred form)
  • CMD ["param1","param2"] (as default parameters to ENTRYPOINT)
  • CMD command param1 param2 (shell form)

[...]

Note: Unlike the shell form, the exec form does not invoke a command shell. This means that normal shell processing does not happen. For example, CMD [ "echo", "$HOME" ] will not do variable substitution on $HOME. If you want shell processing then either use the shell form or execute a shell directly, for example: CMD [ "sh", "-c", "echo $HOME" ].

Upvotes: 2

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