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Questions tagged [docker-image]

A Docker image is an inert, immutable, file that's essentially a snapshot of a Linux container. Images are created with the 'docker build' command or 'docker container' command. Images will produce a container when started with 'docker run'. Images are stored in a Docker registry such as registry.hub.docker.com

A docker image is a lightweight, stand-alone, executable package of a piece of software that includes everything needed to run it: code, runtime, system tools, system libraries, settings. Available for both Linux and Windows based apps, containerized software will always run the same, regardless of the environment.

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What is the difference between a Docker image and a container?

When using Docker, we start with a base image. We boot it up, create changes and those changes are saved in layers forming another image. So eventually I have an image for my PostgreSQL instance and an image for my web application, changes to which…
Bibek Shrestha
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How to remove old and unused Docker images

When running Docker for a long time, there are a lot of images in system. How can I remove all unused Docker images at once safety to free up the storage? In addition, I also want to remove images pulled months ago, which have the correct TAG. So,…
Quanlong
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Where are Docker images stored on the host machine?

I managed to find the containers under directory /var/lib/docker/containers, but I can't find the images. What are the directories and files under /var/lib/docker?
nemo
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Run a Docker image as a container

After building a Docker image from a dockerfile, I see the image was built successfully, but what do I do with it? Shouldn't i be able to run it as a container?
boom
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Docker container will automatically stop after "docker run -d"

According to tutorial I read so far, use "docker run -d" will start a container from image, and the container will run in background. This is how it looks like, we can see we already have container id. root@docker:/home/root# docker run -d…
J John
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docker run

I'm trying to run MULTIPLE commands like this. docker run image cd /path/to/somewhere && python a.py But this gives me "No such file or directory" error because it is interpreted as... "docker run image cd /path/to/somewhere" && "python a.py" It…
ai0307
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How to keep Docker container running after starting services?

I've seen a bunch of tutorials that seem do the same thing I'm trying to do, but for some reason my Docker containers exit. Basically, I'm setting up a web-server and a few daemons inside a Docker container. I do the final parts of this through a…
Eli
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Can’t delete docker image with dependent child images

I am trying docker rmi c565603bc87f Error: Error response from daemon: conflict: unable to delete c565603bc87f (cannot be forced) - image has dependent child images So i can't delete image even with -f flag. How to delete image then and all of…
YakovlevRoman
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Stopping Docker containers by image name - Ubuntu

On Ubuntu 14.04 (Trusty Tahr) I'm looking for a way to stop a running container and the only information I have is the image name that was used in the Docker run command. Is there a command to find all the matching running containers that match…
Collin Estes
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Finding the layers and layer sizes for each Docker image

For research purposes I'm trying to crawl the public Docker registry ( https://registry.hub.docker.com/ ) and find out 1) how many layers an average image has and 2) the sizes of these layers to get an idea of the distribution. However I studied the…
user134589
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In Docker image names what is the difference between Alpine, Jessie, Stretch, and Buster?

I am just looking at docker images in https://hub.docker.com/_/node/ For every version, the images are categorized into Alpine, Jessie, Stretch, Buster etc. What's their meaning?
Muthukumar
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Is there a way to combine Docker images into 1 container?

I have a few Dockerfiles right now. One is for Cassandra 3.5, and it is FROM cassandra:3.5 I also have a Dockerfile for Kafka, but t is quite a bit more complex. It is FROM java:openjdk-8-fre and it runs a long command to install Kafka and…
David
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How to view logs for a docker image?

In the docker world, one can easily see logs for docker container (that is, a running image). But during image creation, one usually issues multiple commands. For example npm install commands in node projects. It would be beneficial to see logs for…
Ville Miekk-oja
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Cannot remove images even though no container is running

I had multiple stopped containers and images on my machine. I want to clean up and remove all containers: docker ps -a returns nothing. I run docker rmi $(docker images -q) to remove the cached images but I get: Error response from daemon:…
Jim
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Can't create a docker image for COPY failed: stat /var/lib/docker/tmp/docker-builder error

I want to create a docker image. This is my work directory: Dockerfile.in test.json test.py And this is my Dockerfile: COPY ./test.json /home/test.json COPY ./test.py /home/test.py RUN python test.py When i launch this command: docker build…
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