skopeo
buildkit
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skopeo | buildkit | |
---|---|---|
22 | 53 | |
7,331 | 7,636 | |
3.5% | 1.5% | |
9.0 | 9.8 | |
1 day ago | 6 days ago | |
Go | Go | |
Apache License 2.0 | Apache License 2.0 |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
skopeo
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[OC] Update: dockcheck - Checking updates for docker images without pulling - automatically update containers by choice.
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.
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Rails on Docker · Fly
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.
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Implement DevSecOps to Secure your CI/CD pipeline
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.
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ImagePullPolicy: IfNotPresent - (image doesn’t exist in repo) - Is it possible to pull the micro service image from an EKS node and then push to repo?
Look at using tools like skopeo or crane
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Monitoring image updates when not using :latest!
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
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Containers without Docker (podman, buildah, and skopeo)
This is what Podman, an open-source daemonless and rootless container engine, was developed with in mind. Podman runs using the runC container runtime process, directly on the Linux kernel, and launches containers and pods as child processes. In addition, it was developed for the Docker developer, with most commands and syntax seamlessly mirroring Docker's. Buildah, an image builder, and Skopeo, the image utility tool, are both complimentary to Podman as well, and extend the range of operations able to be performed.
- docker-compose without dockers
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Exchanging data between other processes
And the Go side: https://github.com/containers/skopeo/blob/main/cmd/skopeo/proxy.go
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Top Docker alternatives for 2022
Skopeo is yet another tool developed by RedHat for various operations on container images and image repositories. Skopeo can be used as an accompanying tool for Podman and Buildah, which are both intended to inspect images, transfer them from one registry to another, and bulk delete them if necessary.
- How are you switching from dockerd to containerd in Kubernetes ? (Docker-in-docker)
buildkit
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The worst thing about Jenkins is that it works
> We are uding docker-in-docker at the moment
You can also run a "less privileged" container with all the features of Docker by using rootless buildkit in Kubernetes. Here are some examples:
https://github.com/moby/buildkit/tree/master/examples/kubern...
https://github.com/moby/buildkit/blob/master/examples/kubern...
It's also possible to run dedicated buildkitd workers and connect to them remotely.
- macOS Containers v0.0.1
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Jenkins Agents On Kubernetes
Now since Kubernetes works off of containerd I'll be taking a different approach on handling container builds by using nerdctl and the buildkit that comes bundled with it. I'll do this on the amd64 control plane node since it's beefier than my Raspberry Pi workers for handling builds and build related services. Go ahead and download and unpack the latest nerdctl release as of writing (make sure to check the release page in case there's a new one):
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Cicada - CI/CD platform written with Rust
Yeah, only Linux containers at the moment, BuildKit is the way we are constructing pipelines and doing caching. Split on if we will support non-linux hosts, but definitely want to find a good solution to not doing Docker-in-Docker.
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Better support of Docker layer caching in Cargo
Relevant issues are https://github.com/moby/buildkit/issues/3011 and https://github.com/moby/buildkit/issues/1512.
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DockerHub replacement stratagy and options
If you notice, the same thing I noticed in this list is that most of these are workarounds to support the web2 api on IPFS. There is a pull in draft for BuildKit that may make native IPFS image support better on the image build side. With the work on the nerdctl side being the most direct support for images for pushing and pulling images with IPFS hashes.
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Why I joined Dagger
Last year I joined Dagger after realizing we were trying to solve all of the same problems (escaping YAML hell, unifying CI and dev workflows, minimizing CI overhead – more on all that later). We were even using the same underlying technology (Buildkit) and running into all of the same challenges.
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Rails on Docker · Fly
How would you do this in a generic, reusable way company-wide? Given that you don't know the targets beforehand, the names, or even the number of stages.
It is of course possible to do for a single project with a bit of effort: build each stage with a remote OCI cache source, push the cash there after. But... that sucks.
What you want is the `max` cache type in buildkit[1]. Except... not much supports that yet. The native S3 cache would also be good once it stabalizes.
I know those questions are probably rhetorical, but to answer them anyway:
> > Nice syntax
> Is it though?
The most common alternative is to use a backslash at the end of each line, to create a line continuation. This swallows the newline, so you also need a semicolon. Forgetting the semicolon leads to weird errors. Also, while Docker supports comments interspersed with line continuations, sh doesn't, so if such a command contains comments it can't be copied into sh.
There heredoc syntax doesn't have any of these issues; I think it is infinitely better.
(There is also JSON-style syntax, but it requires all backslashes to be doubled and is less popular.)
*In practice "&&" is normally used rather than ";" in order to stop the build if any command fails (otherwise sh only propagates the exit status of the last command). This is actually a small footgun with the heredoc syntax, because it is tempting to just use a newline (equivalent to a semicolon). The programmer must remember to type "&&" after each command, or use `set -e` at the start of the RUN command, or use `SHELL ["/bin/sh", "-e", "-c"]` at the top of the Dockerfile. Sigh...
> Are the line breaks semantic, or is it all a multiline string?
The line breaks are preserved ("what you see is what you get").
> Is EOF a special end-of-file token
You can choose which token to use (EOF is a common convention, but any token can be used). The text right after the "<<" indicates which token you've chosen, and the heredoc is terminated by the first line that contains just that token.
This allows you to easily create a heredoc containing other heredocs. Can you think of any other quoting syntax that allows that? (Lisp's quote form comes to mind.)
> Where is it documented?
The introduction blog post has already been linked. The reference documentation (https://github.com/moby/buildkit/blob/master/frontend/docker...) mentions but doesn't have a formal specification (unfortunately this is a wider problem for Dockerfiles, see https://supercontainers.github.io/containers-wg/ideas/docker... instead it links to the sh syntax (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V...), on which the Dockerfile heredoc syntax is based.
(Good luck looking up this syntax if you don't know what it's called. But that's the same for most punctuation-based syntax.)
Unfortunately this syntax is not generally supported yet - it's only supported with the buildkit backend and only landed in the 1.3 "labs" release. It was moved to stable in early 2022 (see https://github.com/moby/buildkit/issues/2574), so that seems to be better, but I think may still require a syntax directive to enable.
Many other dockerfile build tools still don't support it, e.g. buildah (see https://github.com/containers/buildah/issues/3474)
Useful now if you have control over the environment your images are being built in, but I'm excited to the future where it's commonplace!
What are some alternatives?
buildah - A tool that facilitates building OCI images.
kaniko - Build Container Images In Kubernetes
go-containerregistry - Go library and CLIs for working with container registries
jib - 🏗 Build container images for your Java applications.
buildx - Docker CLI plugin for extended build capabilities with BuildKit
podman - Podman: A tool for managing OCI containers and pods.
nerdctl - contaiNERD CTL - Docker-compatible CLI for containerd, with support for Compose, Rootless, eStargz, OCIcrypt, IPFS, ...
amazon-ecr-login - Logs into Amazon ECR with the local Docker client.
dive - A tool for exploring each layer in a docker image
setup-buildx-action - GitHub Action to set up Docker Buildx
sinker - A tool to sync images from one container registry to another