I have a spring-boot application running inside a docker container & its working fine. But the thing is application log file is empty inside the docker container.
In logback-spring.xml log path has been configured to /var/log.
When I go to /var/log directory inside the docker container, I can see log file has been created like "myservice.log"
but when I "cat" the file to see the content, that is completely empty.
Also when I execute
docker logs <container-id>
it returns nothing.
And also I checked the docker root directory in the server.
/apps/docker/containers/<container-id>/<container-id-json.log>
that is also empty.
my Dockerfile has the following structure.
From private-docker-repo/openjdk:11-jre-slim
WORKDIR /opt/services
COPY target/my-service-0.0.1-SNAPSHOT.jar /opt/services/my-service.jar
CMD java -Dspring.profiles.active=dev -Dserver.port=61016 -jar my-service.jar
EXPOSE 61016
What can be the reason for being the log file is empty here. Highly appreciate if anyone can point me out.
Edit – when I deploy the same jar using a linux systemd service logs are just writing fine. I want to know why the same jar not printing any logs inside the docker container
Thanks in advance..!
2
Answers
I solved this just by replacing the
CMDcommand withENTRYPOINT. Now the logs are printing just fine. I did some search on the difference betweenCMDandENTRYPOINTbut still I cant understand how that affect the logging of a container. So if anyone can add a comment what could be happened, that's great not only for me but for the other who will see this question in future.Thank you :)
are you sure that your application running? Get into the docker container and check whether it’s running, seems to me it’s not started.