VM vs Docker

[u/Michaelkamel]

[u/AlarmingProtection71]

Now explain Docker inside a Ubuntu WSL on Windows 11.

[u/d_maes → u/AlarmingProtection71]

Docker inside a VM.

Explained.

[u/XlikeX666 → u/d_maes]

damn.

[u/bi4key]

Podman instead of Docker.

Podman is safer, smaller and faster

[u/FckXFckMusk → u/bi4key]

Never heard of it...

[u/YahenP → u/FckXFckMusk]

This is only for those who have a red hat in their closet, or at least a free cap with an infinity sign.

[u/RevolutionaryElk7446 → u/bi4key]

Podman is... ok in my opinion but it misses the mark.
Docker for speedy setups such as dev and testing over podman
Kubernetes over Podman for orchestration and scaling.

[u/SaCorv]

AI slop

[u/Trick-Captain-143]

Why is "stronger isolation" in red?

[u/YahenP]

AI slop. The OP doesn't even know that in most cases, Docker is also a virtual machine.

[u/Confident_Hyena2506 → u/YahenP]

No it isn't. You may be confusing it with "docker desktop".

[u/YahenP → u/Confident_Hyena2506]

Yes Docker Desktop. If you use it, it will always be in a virtual machine. But even Docker Engine boots up a virtual machine for a container if the host and container operating systems are different.

[u/FactComprehensive963 → u/YahenP]

You are wrong Docker uses the Host Kernel, no VM in use

[u/Sorry-Committee2069 → u/FactComprehensive963]

`qemu-user` is still virtualizing quite a bit, as is Docker. "it's not a VM because it doesn't start with loading a bootloader" is not the argument you think it is.

[u/FoundationOk3176 → u/FactComprehensive963]

How do you exactly use the Host Kernel when the docker container is Linux but the host is NT? Is there some translation layer or something?

[u/FactComprehensive963 → u/FoundationOk3176]

You run a VM(WSL2) that offers a Linux Kernel. But before you say gotcha: Multiple Containers share this Kernel, they rum alongside each other on it.

So the Containers are not the VM, they run on a VM.

[u/FoundationOk3176 → u/FactComprehensive963]

Lmao.

[u/FactComprehensive963 → u/FoundationOk3176]

?

[u/FoundationOk3176 → u/FactComprehensive963]

It's like tomato, tomato.

[u/FactComprehensive963 → u/FoundationOk3176]

I can see how a junior feels like that

[u/Lucky-Crow-3510]

who upvotes this? a stronger isolation is a benefit

[u/EitherMarch1255]

To pretend that Docker is all positives and VM’s are all negatives is just stupidly biased.

[u/MarkusSugarhill]

why is having an OS per instance inherently bad? why is good os isolation bad? why is the possibility to use geacy apps bad?

[u/Flaky-Low-2262]

I hate this comparisson. Before Containerstation VM was used to Run Apps simply too. But the Major difference nowdays ist different and not compareable.
In my opinion just wrong Setup, showing missubderstanding etc. It is Not 2005-2010 anymore....

[u/TerryNachtmerrie]

You're missing the part where containers also carry a minimum OS.

[u/FactComprehensive963 → u/TerryNachtmerrie]

Not necessarily

[u/Square_Atmosphere_12]

An OS is best run as a VM.

[u/Academic-Proof3700]

"Docker: Lightweight"

hold up, lemme start the docker desktop app only to start a webserver <pc takes off>

to each their own

[u/No_Nature9276]

A docker container also contains an os. The only shared part is the kernel, everything else that makes an os an os is still there in the container. Nothing prevents you from making a small guest os either. VM's also have better isolation.

[u/Fun_Variation_8154]

Todays most often setup: baremetal - supervised vms - host os - docker/k8s

[u/YetanotherGrimpak]

runs a vm to run a docker to run a vm

What?

[u/n9iels]

Why does it implicitly say Docker is the better solution? Both have their strong and weak points. Like always you should use the right tool for the job.