docker - Dockerfile RUN命令

Question

我想在我的dockerfile中执行以下命令:

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

这是我尝试过的，但给我错误:

无法执行cassandra-sink-orders

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

Answer 1

使用<的输出重定向是一个shell功能。当将JSON列表提供给CMD时，shell将不会执行该命令。

要使用 shell 功能，请使用以下形式之一:

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

从 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" ].