skopeo VS podman

I believe skopeo should allow you to: https://github.com/containers/skopeo

I decided to go searching for an alternative means to pull a docker image. In my search I discovered Skopeo, an alternative method to download Docker images that proved to be surprisingly effective. It not only downloaded the image faster, it also allowed me to save my image in a tar file, which means you can pull an image on one system and share that image to another system, loading it easily to docker instance on that system. This can be very beneficial if you have multiple systems and don't want to download an image multiple times.

But I'd suggest looking into if it's solved by other tools already, like regclient/regclient and their regsync features or something like containers/skopeo.

Have a use case where we have a CLI (built with cobra) for our dev teams which can execute common tasks. One of those tasks we want to implement is to copy docker images from the internet to our internal registry. A tool such as skopeo can do this and much more. Instead of essentially re-writing the functionality directly into our CLI we'd like to embed it. This would also negate the need for the dev teams to manage multiple CLI tools.

Self hoisting here, I put this together to make it easier to generate single (extra) layer docker images without needing a docker agent, capabilities, chroot, etc: https://github.com/andrewbaxter/dinker

Caveat: it doesn't work on Fly.io. They seem to be having some issue with OCI manifests: https://github.com/containers/skopeo/issues/1881 . They're also having issues with new docker versions pushing from CI: https://community.fly.io/t/deploying-to-fly-via-github-actio... ... the timing of this post seems weird.

FWIW the article says

> create a Docker image, also known as an OCI image

I don't think this is quite right. From my investigation, Docker and OCI images are basically content addressed trees, starting with a root manifest that points to other files and their hashes (root -> images -> layers -> layer configs + files). The OCI manifests and configs are separate to Docker manifests and configs and basically Docker will support both side by side.

skopeo is another tool worth looking into. we've started deploying amd and arm nodes into our k8s clusters, and this tool was incredibly easy to build around for getting multi-arch images into our container registry.

I would use skopeo, the tool is quite handy for working with remote images. https://github.com/containers/skopeo

Using distroless images not only reduces the size of the container image it also reduces the surface attack. The need for container image signing is because even with the distroless images there is a chance of facing some security threats such as receiving a malicious image. We can use cosign or skopeo for container signing and verifying. You can read more about securing containers with Cosign and Distroless Images in this blog.

Look at using tools like skopeo or crane

You could try some commandline tool like skopeo to fetch the image tags regularly and do some shell magic to notify you on any change you want

3.Podman: As a daemonless container engine, Podman offers a command-line interface similar to Docker but does not require root privileges, providing an additional security buffer.

Both docker and podman support rootless containers. Podman is in no way "better" or "more modern" as you suggest, mostly everyone still uses docker.

https://docs.docker.com/engine/security/rootless/

https://github.com/containers/podman/blob/main/docs/tutorial...

This recipe allows you to deploy your app in a redistributable, virtualized, os agnostic, self-contained and self-configured software image and run it in virtualization engines such as Docker or Podman. It even includes things out of the box like the supervisor's tidy configuration for handling your queues, nice defaults for php, opcache and php-fpm, nginx, etc.

Thus motivated, install Podman Desktop, a Docker-compatible Linux containers tool with Podman. After Podman Desktop is installed and running, open a terminal and

What makes containers useful is the tooling that surrounds it. For these labs, we will be using Docker, which has been a widely adopted tool for using containers to build applications. Docker provides developers and operators with a friendly interface to build, ship and run containers on any environment with a Docker engine. Because Docker client requires a Docker engine, an alternative is to use Podman, which is a deamonless container engine to develop, manage and run OCI containers and is able to run containers as root or in rootless mode. For those reasons, we recommend Podman but because of adoption, this lab still uses Docker.

Podman (Pod Manager) is probably one of the most famous alternatives to Docker Desktop. It's an open-source container management tool that offers a daemonless container engine for developing, managing, and running OCI containers on Linux systems.

containers/podman > [Feature]: Android support:

> There are docker and containerd in termux-packages. https://github.com/termux/termux-packages/tree/master/root-p...

But Android 13+ supports rootless pKVM VMs, which podman-machine should be able to run containers in; but only APK-installed binaries are blessed with the necessary extended filesystem attributes to exec on Android 4.4+ with SELinux in enforcing mode.

- Android pKVM: https://source.android.com/docs/core/virtualization/architec... :

> qemu + pKVM + podman-machine: https://github.com/containers/podman/discussions/17717 :

> The protected kernel-based virtual machine (pKVM) is built upon the Linux KVM hypervisor, which has been extended with the ability to restrict access to the payloads running in guest virtual machines marked ‘protected’ at the time of creation.

> KVM/arm64 supports different execution modes depending on the availability of certain CPU features, namely, the Virtualization Host Extensions (VHE) (ARMv8.1 and later).

- "Android 13 virtualization lets [Pixel >= 6] run Windows 11, Linux distributions" (2022)

Given access to the server, I had no idea where to start or even what I was looking for. There was tech I had never worked with before like an Nginx server and podman which is similar to Docker (the only technology I am familiar with) and can work in tandem with it. There was a lot of work to be done and I lot I didn't understand so I got creative.

Podman is an open-source visualization tool developed by RedHat. It leverages the libpod library as a container lifecycle management tool. It is a daemonless container engine OCI management on Linux. It is primarily made for Linux but can run on Windows and Mac using virtual machines managed by Podman.