lima VS nerdctl

Docker is a company that maintains the Docker software and also offers a cloud service to run Docker containers in the cloud. They run DockerHub, which is a platform to store share and run Docker images. The actual standard for Docker containers is called OCI (Open Container Initiative). Because Docker is based on OCI there are many other tools that can interact with Docker containers, like Podman or Lima. If you want to go really deep, I really recommend reading the OCI specification! It's long but super interesting.

I'm currently using colima, and none of the other alternatives that I have found support forwarding UDP ports, which I use a lot, so that's a bummer!

Thankfully, lima has landed a new port forwarder with UDP support! [0]. I'm hoping to be able to use it soon once it makes into a release.

[0]: https://github.com/lima-vm/lima/commit/13e9cbcabc6a0a05ec389...

Lima can launch Ubuntu VMs easily: https://github.com/lima-vm/lima/blob/master/examples/ubuntu....

You can run a virtual machine (e.g. lima) from inside a nix-shell, exactly as you would do with a regular shell.

for others similarly curious, here's an example of the thing: https://github.com/noop-inc/template-java-spring-boot/blob/m...

they seem to be using the excellent lima <https://github.com/lima-vm/lima#readme> for booting on macOS; I run colima for its containerd and k8s support but strongly recommend both projects $(brew install lima colima)

Lima is what I use as well. It's quick and easy to just fire up a VM with default settings, but also very easy to configure with different file sharing options, port forwarding, different linux distributions, etc. (their examples are also pretty good IMO [1]).

In particular I use it to run an amd64 VM, which I need to run a stubborn service for work that doesn't run on arm CPUs.

[1] https://github.com/lima-vm/lima/tree/master/examples

Here's a script that left me in awe the first time I saw it:

https://github.com/containerd/nerdctl/blob/main/extras/rootl...

I have since copied this pattern for many scripts: logging functions, grouping all global vars and constants at the top and creating subcommands using shift.

Rancher Desktop allows you to choose between the Moby engine (offered by Continered) and the dockerd engine (offered by Docker) for building, pushing, and running containers. Compared with Docker Desktop, which provides Docker CLI as a CLI tool, Rancher provides both kubectl and nerdctl for managing Kubernetes and containers, respectively.

What about the docker-cli? colima also ships with a docker-compatible cli to interact with containerd called nerdctl. We can execute the same docker cli commands like:

Using nerdctl: https://github.com/containerd/nerdctl

I'd really disagree that compose files are somehow one-shot, or blindly modified. To the contrary, really, we have them checked in with the source code. Upon deployment to the cluster, the (running) services will be intelligently updated or replaced (in a rolling manner, causing zero downtime). LXC might be more elegant, but I have no idea what simple, file-based format I could use to let engineers describe the environment their app should run in without compose.

I need something that even junior devs can start up with a single command, that can be placed in the VCS along with the code, and that will not require deep Linux knowledge to get running. Open for suggestions here, really.

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):

That's why nerdctl, their cli binary, is so well named.

Well, it is indeed a good option. However, containerd is a good alternative that is growing even among developers. Please see: https://github.com/containerd/nerdctl

Nerdctl/containerd has IPFS support :)

https://github.com/containerd/nerdctl/blob/main/docs/ipfs.md

nerdctl supports IPFS for both image pulling and pushing, including encrypted images and eStargz lazy pulling. For building, the current method is a locally hosted translator so that the traditional pulls can be converted to work over IPFS. They even have docs on running it on k8s node, though if my reading is correct this isn't exactly a cloud native approach (running systemd services on each node...).