For all platforms Docker v 20.10 and above (since December 14th 2020) On Linux, add –add-host=host.docker.internal:host-gateway to your Docker command to enable this feature. (See below for Docker Compose configuration.) Use your internal IP address or connect to the special DNS name host.docker.internal which will resolve to the internal IP address used by the host. … Read more
Virtual memory used by a Java process extends far beyond just Java Heap. You know, JVM includes many subsytems: Garbage Collector, Class Loading, JIT compilers etc., and all these subsystems require certain amount of RAM to function. JVM is not the only consumer of RAM. Native libraries (including standard Java Class Library) may also allocate … Read more
The best way to work around this is to specify the Dockerfile independently of the build context, using -f. For instance, this command will give the ADD command access to anything in your current directory. docker build -f docker-files/Dockerfile . Update: Docker now allows having the Dockerfile outside the build context (fixed in 18.03.0-ce). So … Read more
The problem is you are only binding to the localhost interface, you should be binding to 0.0.0.0 if you want the container to be accessible from outside. If you change: if __name__ == ‘__main__’: app.run() to if __name__ == ‘__main__’: app.run(host=”0.0.0.0″) It should work. Note that this will bind to all interfaces on the host, … Read more
Finally found a solution with a docker-compose method. Since docker-compose file format 2.1 you can define healthchecks. I did it in a example project you need to install at least docker 1.12.0+. I also needed to extend the rabbitmq-management Dockerfile, because curl isn’t installed on the official image. Now I test if the management page … Read more
Disclaimer tl;dr – A simple port forward from the container to the host will not work, and no hosts files should be modified. What exact IP/hostname + port do you want to connect to? Make sure that value is set as advertised.listeners on the broker. Make sure that address and the servers listed as part … Read more
You will need to save the Docker image as a tar file: docker save -o <path for generated tar file> <image name> Then copy your image to a new system with regular file transfer tools such as cp, scp or rsync(preferred for big files). After that you will have to load the image into Docker: … Read more
Disclaimer: I wrote Vagrant! But because I wrote Vagrant, I spend most of my time living in the DevOps world which includes software like Docker. I work with a lot of companies using Vagrant and many use Docker, and I see how the two interplay. Before I talk too much, a direct answer: in your … Read more
Docker has a default entrypoint which is /bin/sh -c but does not have a default command. When you run docker like this: docker run -i -t ubuntu bash the entrypoint is the default /bin/sh -c, the image is ubuntu and the command is bash. The command is run via the entrypoint. i.e., the actual thing … Read more
In order to copy a file from a container to the host, you can use the command docker cp <containerId>:/file/path/within/container /host/path/target Here’s an example: $ sudo docker cp goofy_roentgen:/out_read.jpg . Here goofy_roentgen is the container name I got from the following command: $ sudo docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 1b4ad9311e93 … Read more