I have a Gitlab Repository that hosts a web app made with React / NodeJS, So, I have the client and server in the same repo.
App is working, and I want to use Gitlab Registry my Docker images (client and server).
Thing is my repository has the name: gitlab.com/group/project
And it is expecting a Docker image with the same name.
Instead, I have two Docker images:
registry.gitlab.com/group/project_api
registry.gitlab.com/group/project_client
So, it won't let me push my images. I get:
denied: requested access to the resource is denied
How can I do it ? I don't want to make two repositories.
I could solve it using:
docker push registry.gitlab.com/group/project/api
docker push registry.gitlab.com/group/project/client
Here is what it looks like in the UI:
As specified in the relevant gitlab documentation chapter, you can use up to three levels for your images names:
registry.gitlab.com/group/project:tag
registry.gitlab.com/group/project/image1:tag
registry.gitlab.com/group/project/module1/image1:tag
While trying to build a service on docker-machine i got an error of "image doesn't exist" on that docker-machine manager node. As I checked the docker images command on the manager node, no image was there as expected. But on the root docker side I have those images. I want to access these images on the manager node. I've read few articles where it was mentioned that, maybe I've to upload that image on the docker hub then pull it from that hub. But I want to access it locally. Is there any way to do this as I'm newbie to docker.
This is the command what I tried on my manager machine:
docker#manager:~$ docker service create --name "api-client" -p 4200:4200 api_client
This is my docker images output:
REPOSITORY TAG IMAGE ID CREATED SIZE
api_client latest 097b19c4deb8 27 hours ago 1.15GB
But on my docker#manager terminal, my docker image folder is empty.
The problem is that there is no repository to hold the image. The repository needs to be pulled from to a repository to each node in the Swarm before it can execute. In general you need to do the following:
Setup a repository, if you want a local repository there is a guide here, but it will be some hassle to get it up and running i and "insecure http" version. An easier way is to get yourself a free docker hub account and put your image there.
Tag your local image with the repository name. Howto is shown in the guide above.
docker tag <local image> <repository>/<image:tag>
Login to the repository (if in cloud) and push your image to the repository
docker login
docker push <repository>/<image>:<tag>
To run the image (your command)
docker service create --name "api-client" -p 4200:4200 <repository>/<image>:<tag>
Your can also try to pull an image into the local cache of a node using
docker pull <repository>/<image>:<tag>
I need to pull all images from an openshift template file, in my case it's openwhisk.
I'm trying to deploy this project on a private network so I don't have access to docker's official repository from there and thus need to push the images myself.
I was hoping there is a script/tool to automate this process.
There is no such available tool/script but you can write small shell script to do it.
If public dockerhub registry not allowed then either use private separate registry
or
Pull the image in your local laptop then tag it and push to openshift registry.
After pushing all the image to openshift, import your openshift template to deploy your application.
Below is the steps for single image. you can define list of image and loop it over the list.
docker pull imagename
oc login https://127.0.0.1:8443 --token=<hidden_token> #copy from https://your_openshift_server:port/console/command-line
oc project test
oc create imagestream imagename
docker login -u `oc whoami` -p `oc whoami --show-token` your_openshift_server:port
docker tag imagename your_openshift_server:port/openshift_projectname/imagename:tag
docker push your_openshift_server:port/openshift_projectname/imagename:tag
you can get more details on page suggested by graham-dumpleton
.
Graham Dumpleton's book talks about this. You create a list (JSON) of all the images used and import that into the openshift namespace. Since your OpenShift is offline/disconnected, you'll also change any remote registry to the URL of the internal, hosted registry.
Example that imports all JBoss images: https://github.com/projectatomic/adb-utils/blob/master/services/openshift/templates/common/jboss-image-streams.json
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'm confused as to the difference between docker registries and repositories. It seems like the Docker documentation uses the two words interchangeably. Also, repositories are sometimes referred to as images, such as this from their docs:
In order to push a repository to its registry, you need to have named
an image or committed your container to a named image as we saw here.
Now you can push this repository to the registry designated by its
name or tag.
How can you push a repository to a registry? Aren't you pushing the image to the repository?
Docker registry is a service that is storing your docker images.
Docker registry could be hosted by a third party, as public or private registry, like one of the following registries:
Docker Hub,
Quay,
Google Container Registry,
AWS Container Registry
or you can host the docker registry by yourself
(see https://docs.docker.com/ee/dtr/ for more details).
Docker repository is a collection of different docker images with same name, that have different tags. Tag is alphanumeric identifier of the image within a repository.
For example see https://hub.docker.com/r/library/python/tags/. There are many different tags for the official python image, these tags are all members of the official python repository on the Docker Hub. Docker Hub is a Docker Registry hosted by Docker.
To find out more read:
https://docs.docker.com/registry/
https://github.com/docker/distribution
From the book Using Docker, Developing and deploying Software with Containers
Registries, Repositories, Images, and Tags
There is a hierarchical system for storing images.
The following terminology is used:
Registry
A service responsible for hosting and distributing images. The default registry is the Docker Hub.
Repository
A collection of related images (usually providing different versions of the same application or service).
Tag
An alphanumeric identifier attached to images within a repository (e.g., 14.04 or stable ).
So the command docker pull amouat/revealjs:latest will download the image tagged latest within the amouat/revealjs repository from the Docker Hub registry.
Complementing the information:
You usually push a repository to a registry (and all images that are part of it). But you can push a single image to a registry. In all cases, you use docker push.
An image has a 12-hex-digit Image ID, but is also identified by: namespace/repo-name:tag
The image full name can be optionally prefixed by the registry host name and port: myregistryhost:5000/namespace/repo-name:tag
A common naming convention is to use your registry user-name as what I called "namespace".
A docker repository is a cute combination of registry and image.
docker tag foo <registry>/<image>:<tag>
is the same as
docker tag foo <repository>:<tag>
Docker Registry is a service, which you can either host yourself (Trusted and Private) or you can let docker hub be the host for this service. Usually, if your software is commercial, you will have hosted this as a "Private and Trusted" registry. For Java Developers, this is somewhat analogous to Maven Artifactory setup.
Docker Repository is a set of "Tagged" images. An example is that you might have tagged 5 of ubuntu:latest images:
a) Nano editor (image1_tag:v1)
b) A specific software 1 (image1_tag:v2)
c) Sudo (image1_tag:v3)
d) apache http daemon (image1_tag:v4)
e) tomcat (image1_tag:v5)
You can use docker push command to push each of the above images to your repository. As long as the repository names match, they will be pushed successfully, and appear under your chosen repository and correctly tagged.
Now, your question is, "So where is this repository hosted/who is managing the service"? That is where Docker Registry comes into picture. By default you will get a docker hub registry (Open Source) which you can use to keep your private/public repository. So without any modification, your images will be pushed to your private repository in docker hub. An example output when you pushing your image tags are the following:
docker#my-docker-vm:/$ docker push mydockerhub/my-helloworld-repo:my_tag
The push refers to repository [docker.io/mydockerhub/my-helloworld-repo]
bf41e934d39d: Pushed
70d93396f87f: Pushed
6ec525dfd060: Pushed
705419d10b13: Pushed
a4aaef726d02: Pushed
04964fddc946: Pushed
latest: digest: sha256:eb93c92351bce785aa3ec0de489cfeeaafd55b7d90adf95ecea02629b376e577 size: 1571
docker#my-docker-vm:/$
And if you type immediately docker images --digests -a you can confirm that your pushed image tags are now showing new signature against the private repository managed by docker hub registry.
A Docker image registry is the place to store all your Docker images. The image registry allows you to push and pull the container images as needed.
Registries can be private or public. When the registry is public, the images are shared with the whole world whereas in the private registry the images are shared only amongst the members of an enterprise or a team.
A registry makes it possible for the Docker daemon to easily pull and run your Docker images.
Docker Hub and other third party repository hosting services are called “registries”. A registry stores a collection of repositories.
As a registry can have many repositories and a repository can have many different versions of the same image which are individually versioned with tags.
The confusion starts with this definition of a tag: "An alphanumeric identifier attached to images in a repository"
I'd rather call that alphanumeric identifier that you append with a ':' a tag-suffix for now. When somebody says "'latest' is the default tag", then this kind of tag-suffix is meant.
In reality, the :latest' suffix is technically part of the tag. The entire name is a tag. All these are tags (possibly referring to the same image):
myimagename
myimagename:latest
username/theirimagename:1.0
myrepo:5000/username/imagename:1.0
(I say imagename here, just to illustrate the other main source of confusion. That's the repositoryname, of course. Sorry.)
Examples:
a) When you want to name your image while building, you use docker build -t thisname ... -- that is -t for tag, (not -n for name).
b) When you want to push that image to a registry, you need to have the full URL (starting with registryname and ending with a tag-suffix) as a tag:
docker tag thisname mylocalregistry:5000/username/repoimagething:1.0
Now you push the image known as thisname by saying:
docker push mylocalregistry:5000/username/repoimagething:1.0
Naming things is hard.
Alas! A repository is not a "container" (aaargh...) where you put things in, that is what muggles think...