I'm new to docker, then the problem may describe not clearly in title. I want to do it that when I use pull image, it will check local registry at first. Then, if there is no this image in local registry, it will download from docker hub and auto push it to local registry. How to do it?
docker hub <-> registry <-> client pull image
It can use Mirror to do this work:
it pulls the image from the public Docker registry and stores it
locally before handing it back to you. On subsequent requests, the
local registry mirror is able to serve the image from its own storage.
Related
Expand RED HAT CONTAINER REGISTRY with a local Docker image repository.
As a Docker user, I can work with the registry (pull, push) everything is OK!
But also, as a user, I can upload an image with the docker hub with the pull command.
For example:
$ docker pull debian
Question:
How to prevent the user to "pull" the image with docker hub and allow using only the openshift internal registry?
Those. Is it possible to configure any config so that the user accesses the internal repository of images?
Is there anyway to proxy or mirror the following Docker registries with my own Private Docker Registry?
Google Container Registry
AWS EC2 Container Registry
Azure Container Registry
Quay.io
DockerHub
I want to use a Private Registry to store all Docker Images I need.
I want to pull Images without changing the repo/image:tag name when doing a docker pull? For example, with Nexus if I want to do a:
docker pull gcr.io/google_containers/metrics-server-amd64:v0.2.1
I must change the repo name:
docker pull mynexus.mycompany.com/google_containers/metrics-server-amd64:v0.2.1
Is there any docker/kubernetes config that says if someeone does a pull if a gcr.io Image just go to mynexus.mycompany.com instead and use as a pass thru cache.
GCR, ECR, ACR and Quay.io not supported current docker
Try this proxy
https://github.com/rpardini/docker-registry-proxy
https://github.com/rpardini/docker-caching-proxy-multiple-private
In Sonatype Nexus,
create a "docker (proxy)" repository.
create a "docker (group)" repository.
In the group, repository, add both the proxy and any hosted repos
You should now be able to refer to the group repository URL, qualified with your image names and tags, to retrieve any image in any repository that the group can see. You will need to set-up individual proxies for each of GCR, Quay, etc. Also, your image build processes will need to push to the one of your hosted repositories, NOT to the group repository. You push to your hosted, and pull from your group.
I have something on my mind that is bugging me. When running docker images I see a list of my local images I have in my docker environment. When pulling Images I pull it from a registry and more specific pull the specified tag managed by the repository.
so there is the registry as the big hub to store all image
repositories
and the repository is storing commits/tagged versions of a specific image
But what is docker images then? It's a registry as well isn't it? It holds all images that I've built locally or pulled.
If my claim is valid:
How does it comply with running a private registry (mentioned here https://docs.docker.com/registry/deploying/)
Running this docker run -d -p 5000:5000 --restart=always --name registry registry:2
Would deploy this new registry into my docker images...
So now I have a registry within my registry... registception?
What is the difference besides the custom registry is deployable?
Its not a local image registry as other questions have pointed. It is an image cache. The purpose of the image cache is to avoid having every time to download the same image whenever you do a docker run.
docker images simply lists all the cached images on the machine. Whenever there is newer image on the registry, the image(some layers) are downloaded and cached when doing docker pull .... Also, when a layer exists in the local cache, docker tells you that, example:
Step 2/2 : CMD /bin/bash
---> Using cache
On the other hand, a docker registry is a central repository to store images. It provide a remote api to pull and push images. The local image cache does not have this feature. Images in the local cache are read and stored used local docker commands that simply read files under /var/lib/docker/...
To make things clear, think of Docker remote registries (such as Docker Hub) as the remote Git repositories. You pull Docker images (like git repositories) that you need and you play with it.
Like remote Git repositories such as GitHub\BitBucket, Docker registries are also public and private. Public registries are for public usage and open-source projects. Examples include in like Docker Hub. Where as private registries are for organizational use or for your own. Examples for private registries include Azure Container Registry, EC2 Container Registry etc.
The official Docker Registry image is just a Docker registry image for your own system, you can't share them with others unless you have a server or a public Internet IP address. Think of it as Bonobo Private Git Server for Windows.
Your local image registry as you mentioned are all those images that you have build locally or pulled from a registry public or private you can see it like a local cache of images that you can re use without download or rebuild each time.
Running the registry what actually does is to spin up a server that implements the Docker Registry API which allows users to push, pull, delete and handles the storage of this images and their layers. See it like a central repository like npm, nexus
For example if you run the registry in your.registry.com:5000
You can do things like
docker build -t your.registry.com:5000/my-image:tag .
docker push your.registry.com:5000/my-image:tag
So others that have access to your server can pull it
docker pull your.registry.com:5000/my-image:tag
In docker, how can one display the current registry info you are currently logged in? I installed docker, if I now do docker push, where does it send my images?
I spend over 30min searching this info from Google and docker docs, and couldn't find it, so I think it deserves its own question.
There's no concept of a "current" registry - full image tags always contain the registry address, but if no registry is specified then the Docker Hub is used as the default.
So docker push user/app pushes to Docker Hub. If you want to push it to a local registry you need to explicitly tag it with the registry address:
docker tag user/app localhost:5000/user/app
docker push localhost:5000/user/app
If your local registry is secured, you need to run docker login localhost:5000 but that does not change the default registry. If you push or pull images without a registry address in the tag, Docker will always use the Hub.
This issue explains the rationale.
The way docker images work is not the most obvious but it is easy to explain.
The location where your images will be sent to must be define in the image name.
When you commit an image you must name it [registry-IP]:[registry-port]/[imagepath]/[image-name]
If you already have the image created and you want to send it to the local registry you must tagged it including the registry path before you push it:
docker tag [image-name] [registry-IP]:[registry-port]/[image-name]
docker push [registry-IP]:[registry-port]/[image-name]
I was wondering if there was a way to clone images from a local server.
The servers running containers will be hosted behind a bandwidth constrained connection. It would be great if there was a way to pull given containers for one server and then pull from that initial local server to update the containers on the remaining servers.
You could pull those images you want, give hem a new tag, and put them in your own registry.
For instance, let's say you pulled down the official registry image and stood it up at myregistry.internal.mycompany.com. Now, if you wanted to have a CentOS image available for all of your servers but didn't want to pull them all from the official repo (incurring the bandwitch charges) then you could pull a CentOS image (let's say centos:latest - docker pull centos) and then give that image a new tag, like this:
docker tag centos:latest myregistry.internal.mycompany.com/centos:latest
Now from your other servers you just pull 'myregistry.internal.mycompany.com/centos:latest'
Setting up your own repo is really easy as a docker container itself. You can pull the image and learn more at https://registry.hub.docker.com/_/registry/
I think you have a few options. If what you actually want to manage is images rather than containers:
You could set up a private Docker registry, and then push to/pull from that local repository. This may ultimately be the easiest if that is something that you want to do fairly often, because you're just using standard docker push/docker pull commands.
You could use docker save to save images on one server and docker load to load the images on another server.
If you are actually trying to move containers around:
You could use docker export on one server and docker import on another server.