I want to use a centos7.6 docker image, but I can't find centos7.6(arm) in docker hub.
Is there a way to build centos7.6 docker image match to arm(I am working on centos x86_64)? Thanks!
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I have created a container using the following command: docker container run -i ubuntu. However, when I try to run a command within the container, such as cd, I get the following error: bash: line 1: cd: $'bin\r': No such file or directory. What could be the issue?
When you docker run an image, or use an image in a Dockerfile FROM line, or name an image: in a Docker Compose setup, Docker first checks to see if you have that image locally. If you have that image, Docker just uses it without checking Docker Hub or the other upstream registry.
Meanwhile, you can docker build or docker tag an image with any name you want...even a name that matches an official Docker Hub image.
You mention in a comment that you at some point did run docker build -t ubuntu .... That replaces the ubuntu image with what you built, so when you later docker run ubuntu, it's running your modified image and not the official Docker Hub Ubuntu image.
This is straightforward to fix. If you
docker rmi ubuntu
it will delete your local (modified) copy, and the next time you use it, Docker will automatically pull it from Docker Hub. It should also work to
# Explicitly get the Docker Hub copy of the image
docker pull ubuntu
# Build a custom image, pulling whatever's in the FROM line
docker build --pull -t my/image .
(You can also hit this in a Docker Compose setup if you specify both image: and build:; this instructs Compose on an explicit name to use for the built image. You do not need to repeat the FROM line in image:, and it causes trouble if you do. The resolution is the same as described above. I might leave image: out entirely unless you're planning to push the image to a registry.)
I used docker ps/docker ps -a/docker ps -n 1 all not showing my first image.
But it after I using docker pull hello-world it saying it installed successfully
docker pull pulls an image (and all the layers that make it up) to your local machine, but doesn't run anything.
docker ps lists containers on your system.
Once you run that container (using docker run hello-world), you'll see it in dokcer ps.
To view the image you pulled, you could use docker images.
As you find from the previous answer docker pull will download the image (mostly from the docker hub) and when trying to pull next time, it finds the image already in your local machine. To see all the images you have locally, use docker image ls.
I'm learning about Docker Containers, so, I found this repo with a lot of images and references, can anyone help me in order to understand how can I use those images?
I know the docker run --rm command
With docker you first need a docker image. A docker image is a representation of an application that docker can understand and run.
The most common ways to get one is to use docker pull or to generate yours with docker build.
You can check the images you got with docker images
Once you got your image you can run it with docker run MyImage, this will create a container, a container is a running application.
I have a docker image. I want to analyze the docker image history, for this I can use docker image history command in the docker installed environment.
But when am working in a Openshift cluster, I may not have the access to the docker command here. So here I want get the docker history command result for the given image.
So basically I have a docker image and I don't have docker installed there. In this case how can we get the history of that docker image?
Can anyone please help me on this?
You can get the registry info either via curl or skopeo inspect. But the rest of the metadata is stored inside the image itself so you do have to download at least the final layer.
I am trying to use docker(dind) image for building an image. When I run docker info in the DockerFile, it complains dockerhost cannot be found. Is there any way when building a Docker image, can we use docker host in the build step ?
I don't think there is an effective way to run docker in DIND when building image via dockerfile. I ran a container version of DIND image and added all the config stuff and committed that to an image which solved the problem of me using dind