In my working environment , i can't connect to the network, but i can connect to the download machine ,which can connect to network .
But i do not know how to find a docker image and download it .
The website docker hub just show the command such as "docker pull nginx" , but i can't connect to the network ,it is useless for me .
My question:
Now, I have install docker by download docker-engine.deb.
where can I get a docker image off line?
You'll need access to a registry where docker images are stored. But if you don't have images and no registry with images yet, than you have to pull the image from the internet.
A recommended way could be:
Install docker on a machine (maybe your local machine) with internet access and pull an image:
$ docker pull busybox
Use docker save to make a .tar of your image
$ docker save busybox > busybox.tar
or you can use the following syntax
$ docker save --output busybox.tar busybox
Reference is here.
You can use a tool like scp to send the .tar to your Docker server where you don't have internet access.
Now you can use docker load to extract the .tar and get your image:
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
$ docker load < busybox.tar.gz
Loaded image: busybox:latest
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
busybox latest 769b9341d937 7 weeks ago 2.489 MB
Reference is here
Related
I'm trying to load a Docker image into an environment without internet connection (nginx:stable-alpine).
Once I've downloaded the image with pull on a computer with internet connection, I use the save command:
docker image save --output docker-image-nginx.tar nginx:stable-alpine
Then I copy it to the environment without internet connection, and load it:
docker image load --input docker-image-nginx.tar
The image gets loaded and can be seen with docker image ls:
REPOSITORY TAG IMAGE ID CREATED SIZE
nginx stable-alpine 8c1bfa967ebf 4 weeks ago 21.5MB
But when I create a container with the run command:
docker run --name nginx -p 8080:80 nginx:stable-alpine
I get this error:
/docker-entrypoint.sh: No files found in /docker-entrypoint.d/, skipping configuration
The container can be created with the same command on the computer with internet connection.
What's wrong in the process of saving and loading the image?
What about trying to save a docker container instead an image?
For example:
In your host with internet
docker run --name mynginx -p 8080:80 nginx:stable-alpine
docker save mynginx > mynginx.tar
In your host without internet
docker load < mynginx.tar
I have a docker image:
$ docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
elucidbio/capcompute local a5ed348be9f8 About a minute ago 2.27GB
But when I try and start it, it fails:
$docker run --name capcompute elucidbio/capcompute
Unable to find image 'elucidbio/capcompute:latest' locally
docker: Error response from daemon: repository elucidbio/capcompute not found: does not exist or no pull access.
What stupid thing am I missing here?
Your tags dont match. Your local image tag is "local" but its looking for "latest" because you didn't specify a tag. To run it you should append the tag of "local".
docker run --name capcompute elucidbio/capcompute:local
If you launch docker-run by yourself it works, if you do this with docker-compose it doesn't
roman#debian ~/D/O/devops> docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
ca4f61b1923c: Pull complete
Digest: sha256:083de497cff944f969d8499ab94f07134c50bcf5e6b9559b27182d3fa80ce3f7
Status: Downloaded newer image for hello-world:latest
Hello from Docker!
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.
To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash
Share images, automate workflows, and more with a free Docker ID:
https://cloud.docker.com/
For more examples and ideas, visit:
https://docs.docker.com/engine/userguide/
roman#debian ~/D/O/devops> docker-compose build app
Building app
ERROR: Couldn't connect to Docker daemon - you might need to run `docker-machine start default`.
roman#debian ~/D/O/devops>
Ok it's solved, previously been installing compose from repository, now installed through pip and it's working
I'm migrating a project from a private registry to hub.docker.com but I don't have all tagged image on computer.
I have access to the registry machine via SSH.
Question
How can I push all my registry images to hub.docker.com?
I think that the only way is to pull them all, then retag them and push to hub.docker.com
You can script it with something like:
for repository in $(curl -s http://localhost:5000/v2/_catalog | jq -r '.repositories[]'); do
for image in $(curl -s http://localhost:5000/v2/${repository}/tags/list | jq -r '(.name + ":" + .tags[])')
docker image pull localhost:5000/${image}
docker image tag localhost:5000/${image} <YOUR_HUB_PREFIX>/${image}
docker image push <YOUR_HUB_PREFIX>/${image}
# if you need some cleanup
docker image rm localhost:5000/${image} <YOUR_HUB_PREFIX>/${image}
done
done
Access to your registry machine via SSH, use docker login to login inside your Docker Hub account, add a tag to your images which points to Docker Hub docker tag my_own_registry.com/image:tag user/image:tag a then push that new tag using docker push user/image:tag.
#zigarn script automates this job.
Edit: You commented that your bandwith is bad, then you can access via ssh to your registry machine, save your image using docker save, then copy it to your machine and load it by docker load and finally push it to Docker Hub as explained above.
In this question it turned out, that I cannot use the sha256 mechanism in the FROM line in a Dockerfile to verify I am using the correct locally built non-DockerHub image in another derived image.
Is there another way to verify locally built Docker images? Some best practice maybe?
From docs:
By default, docker pull pulls images from Docker Hub. It is also
possible to manually specify the path of a registry to pull from
You can start a private docker registry on you localhost with the following command:
docker run -d -p 5000:5000 --restart=always --name registry registry:2
Say your image name isubuntu Then push image to that specific registry with:
docker push localhost:5000/ubuntu
In your Dockerfile you can use:
From localhost:5000/ubuntu