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
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
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
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
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
You should check the ADD and COPY documentation for a more detailed description of their behaviors, but in a nutshell, the major difference is that ADD can do more than COPY: ADD allows <src> to be a URL Referring to comments below, the ADD documentation states that: If is a local tar archive in a … Read more
Docker originally used LinuX Containers (LXC), but later switched to runC (formerly known as libcontainer), which runs in the same operating system as its host. This allows it to share a lot of the host operating system resources. Also, it uses a layered filesystem (AuFS) and manages networking. AuFS is a layered file system, so … Read more
Docker is like a recipe. You take everything you need to run some code and you put it on a list. That list of ingredients is then able to be cooked anywhere that can run docker; where as a VM is like creating a new kitchen every time you need to run something. Because Docker … Read more
I ran into a similar issue some time back. The image might have a lot of small files and you might be falling short on disk space or inodes. I was able to get to it only when I did “watch df -hi”, it showed me that inodes were pegging up to 100 but docker … Read more