I am trying to use Docker + Kubernetes for my application management.
I have installed kubectl, kubeadm, kubelet (got the steps from google docs) for Kubernetes cluster.
Now cluster is having 2 node(1 Master, 1 Child)
I have a customize Dockerfile , how can it use it as a Kubernetes pods ?
If this is not possible,
How to transmit the docker build to the Kubernetes child from master.
You could use a private Docker registriy outside or inside the cluster or work with local (pre-pulled) images.
Outside the cluster you might want to look at these:
Docker registry image
Jfrog Artifactory registry
Sonatype Nexus
Dockerhub private registry
Google private registry
Amazon ECR
Quai.io registry
Azure registry
Inside the cluster you might want to look at the Private Docker Registry in Kubernetes
If you're not interested to use a registry, you could also build the image on every Kubernetes node so that Docker doesn't have to pull it. To avoid that Kubernetes tried to pull anyways you would then have to set the imagePullPolicy of your containers to Never. That's described within the official documentation.
Dockerfiles create images which are used by pods, Kubernetes only uses your created docker image it doesn't build docker images for you. I think what you want to do is:
create an image from your dockerfile by using docker build
send that image to dockerhub using docker push
create a kubernetes deployment that uses your image https://kubernetes.io/docs/user-guide/deployments/
That should get you in the right direction but you will have to read up more :)
Related
I was wondering is it possible to use cached docker images in gitlab registry for gitlab-ci?
for example, I want to use node:16.3.0-alpine docker image, can I cache it in my gitlab registry and pull it from that and speed up my gitlab ci instead of pulling it from docker hub?
Yes, GitLab's dependency proxy features allow you to configure GitLab as a "pull through cache". This is also beneficial for working around rate limits of upstream sources like dockerhub.
It should be faster in most cases to use the dependency proxy, but not necessarily so. It's possible that dockerhub can be more performant than a small self-hosted server, for example. GitLab runners are also remote with respect to the registry and not necessarily any "closer" to the GitLab registry than any other registry over the internet. So, keep that in mind.
As a side note, the absolute fastest way to retrieve cached images is to self-host your GitLab runners and hold images directly on the host. That way, when jobs start, if the image already exists on the host, the job will start immediately because it does not need to pull the image (depending on your pull configuration). (that is, assuming you're using images in the image: declaration for your job)
I'm using a corporate Gitlab instance where for some reason the Dependency Proxy feature has been disabled. The other option you have is to create a new Docker image on your local machine, then push it into the Container Registry of your personal Gitlab project.
# First create a one-line Dockerfile containing "FROM node:16.3.0-alpine"
docker pull node:16.3.0-alpine
docker build . -t registry.example.com/group/project/image
docker login registry.example.com -u <username> -p <token>
docker push registry.example.com/group/project/image
where the image tag should be constructed based on the example given on your project's private Container Registry page.
Now in your CI job, you just change image: node:16.3.0-alpine to image: registry.example.com/group/project/image. You may have to run the docker login command (using a deploy token for credentials, see Settings -> Repository) in the before_script section -- I think maybe newer versions of Gitlab will have the runner authenticate to the private Container Registry using system credentials, but that could vary depending on how it's configured.
We've just brought Artifactory into our organization. We have a lot of Fargate stacks that are pulling the Docker images from ECR. We now want to pivot and store our Docker images in Artifactory and tell Fargate to pull the images from Artifactory.
Does anyone know how to do this?
Thanks
An Artifactory repository for Docker images is a Docker registry in every way, and one that you can access transparently with the Docker client (see documentation)
In Artifactory, start by creating a local Docker repository, then follow the "Set Me Up" instructions for that repository to upload/deploy your docker images to it.
The "Set Me Up" dialog for the Docker repository also provides the steps to have your docker clients consume/download the images from your Docker repository/registry. You would just have to replace the references of ECR with the one for your Artifactory docker repository/registry in your docker client commands.
This documentation page provides step-by-step information on how to use Artifactory as a Docker registry.
Artifactory also provides the capabilities of Remote Docker repositories, which provides proxying/caching of external registries, and Virtual Docker repositories for the aggregation of both local and remote repositories into one single entry point.
I have an docker public image, Now for some reason we had to shift it to AWS ECR,Now I am able to transfer the image to ECR from docker hub, but how to make sure that all the stable release in dockerhub will be pushed to AWS ECR, I want my ECR repo update with latest dockerhub image all the time.
You might consider building and publishing your Docker image through GitHub and its CI (Continuous Integration) GitHub Actions option.
That way, you can, in your GitHub workflow, chain:
Publish-Docker-Github-Action: Publishes docker containers to DockerHub
appleboy/docker-ecr-action: Uploads Docker Image to Amazon Elastic Container Registry (ECR).
Each time you are publishing a new version of your image, it would also be available in ECR.
Using Docker Registry Sync tool, Dregsy -> https://github.com/xelalexv/dregsy
While trying to signup with docker hub by selecting a suitable plan, I see pricing is based on Private Repositories Required and Parallel Builds desired.
What is a PARALLEL BUILD in this context?
PS:
After a bit of an internet search, I found that docker hub can pull up my source code from external repositories and build an image by itself and later publish the same into Hub. If this is true and I don't want to use docker hub build service, can I ignore the PARALLEL BUILD part entirely?
Dockerhub is a service provided by Docker for finding and sharing container images with your team. It provides the following major features:
Repositories: Push and pull container images.
Teams & Organizations: Manage access to private repositories of
container images.
Official Images: Pull and use high-quality container images provided
by Docker.
Publisher Images: Pull and use high-quality container images provided
by external vendors. Certified images also include support and
guarantee compatibility with Docker Enterprise.
Builds: Automatically build container images from GitHub and
Bitbucket and push them to Docker Hub
Webhooks: Trigger actions after a successful push to a repository to
integrate Docker Hub with other services.
More info here.
If you see the pricing page of dockerhub. There are two things you should know:
PARALLEL BUILD specifies the number of images that you can build
parallelly (con-currently). The parallelism is across all of the
repos owned by you.
Private Repository specify the number of repository that are private and not exposed publicly.
If you're new to docker and trying out it first time then its ok to go with dockerhub free plan where you can have max 1 private repository and 1 parallel build count.
If you want to store docker images of your project privately that is hosted somewhere on public cloud like AWS then I suggest to use docker registry provided by those cloud providers like AWS ECR, Azure ACR, Google container registry and so on.
Or else you can host docker image privately by running docker registry inside container. Check this.
Hope this helps.
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.