We have a legacy application that I am trying to dockerize. The jar of the application has both the application and an activemq bundled together. (We cannot change the way it is built). And has certain installation steps. I created the following initial Dockerfile for this however I am facing an issue (mentioned after the Dockerfile) when I run the image.
The Dockerfile looks like this :
FROM registry:4000/openjdk:8-jre-alpine RUN addgroup -S appuser && adduser -S -G appuser appuser ADD ./fe.jar /home/appuser RUN chmod +x /home/appuser/fe.jar \ && chown appuser:appuser /home/appuser/fe.jar USER appuser RUN ["java", "-jar", "/home/appuser/fe.jar", "-i"] WORKDIR /home/appuser/fe/activemq/bin CMD ["/bin/sh", "-c", "activemq"]
The RUN command extracts the application and the activemq at the location into folder called fe.
The WORKDIR seems to be setting the working directly to activemq/bin. I confirmed this by using sh script which triggers when the image is run. In the sh script I trigger an ls and pwd command to see the contents and the location.
However when I run the image which triggers the CMD command I get the error that :
/bin/sh: activemq: not found
What can be the possible issue here?
activemq is an executable in your
bin directory (and not in PATH) then you need to edit your
CMD ["/bin/sh", "-c", "./activemq"]
Also make sure that your script is executable.
Found the problem. The activemq script starts with #!/bin/bash and I am trying to run it using sh. I need to first install bash in the image and then run the activemq script using one.
I got the hint from this answer : docker alpine /bin/sh script.sh not found
Now it moved ahead however the container dies after running immediately. Not sure what the issue is. Doesn’t even give any error.