DEV Community: Padhmeni Priya R R

Say Goodbye to WSL2 Lag Docker Built Its Own Virtual Machine Manager

Padhmeni Priya R R — Thu, 13 Aug 2026 15:43:57 +0000

Docker Desktop has always leaned on someone else's virtualization tech — Apple's framework on Mac, WSL2 or Hyper-V on Windows. As of Docker Desktop v4.86, that changes: Docker shipped its own first-party hypervisor, called Docker VMM, now in public beta on Mac and Windows, with GA targeted for end of October 2026. This post explains what a VMM even is, why Docker built one, and exactly how to try it — for beginners and pros alike.

Download the latest version of Docker Desktop here choose the operating system according to what machine and where you want to install it

🧠 Core Concept: What's a VMM, and Why Does It Matter?

Docker Desktop doesn't run containers directly on macOS or Windows — neither OS ships a native Linux kernel. So Docker spins up a lightweight Linux VM in the background, and your containers actually run inside that. The Virtual Machine Manager (VMM) is the software layer that creates and manages this VM — the engine room nobody sees, until it's slow.

Before Docker VMM, that middle layer was third-party: Apple Virtualization Framework or legacy HyperKit/QEMU on Mac, WSL2 or Hyper-V on Windows. Docker VMM replaces it with Docker's own hypervisor, purpose-built for container workloads instead of general-purpose VMs.

🔍 Check what you're running right now

Skip the Settings UI — confirm your current engine straight from the terminal:

# Confirm Docker Desktop is running and see the active context
docker desktop status

Docker Desktop is running

# See kernel + OS details of the Linux VM your containers run inside
docker info --format 'OS: {{.OperatingSystem}} | Kernel: {{.KernelVersion}}'

OS: Docker Desktop | Kernel: 6.10.14-linuxkit

Reference: docs.docker.com/reference/cli/docker/desktop/status · docs.docker.com/reference/cli/docker/system/info

🎯 Try this now: open Docker Desktop → Settings → General → Virtual Machine Manager → select Docker VMM → Apply & restart. Then re-run docker desktop status to confirm it's live.

Remember to restart your machine if you do no see this option

⚙️ What Actually Changed

	Improvement	Purpose	Reference
🟢⚡	Faster startup	Container start times drop across first launch, restarts, and switches	VMM beta blog
🟢🧠	Idle memory reclaim	Returns RAM to host when containers aren't active	VMM docs
🔵📂	Faster file I/O	Cuts latency in the edit-compile-test loop	VMM beta blog
🔵🪟	No more WSL2 dependency (Windows)	Real VM boundary, Hyper-V-level isolation at WSL2-level speed	VMM beta blog
🟣🛡️	First-party governance	Docker can monitor/control the hypervisor it owns	VMM docs

🚀 Switching to Docker VMM

🟢 Beginner 🔵 Intermediate 🟣 Advanced | 🍎 Mac 🪟 Windows

	Step	Purpose	Reference
🟢🍎🪟	Allocate ≥4GB RAM	Docker VMM requires this minimum for the Linux VM	VMM docs
🟢🍎🪟	Settings → General → Virtual Machine Manager	Locate the VMM selector in Docker Desktop	VMM docs
🟢🍎🪟	Select "Docker VMM"	Opts into the new first-party hypervisor	VMM docs
🟢🍎🪟	Apply & restart	Applies the change and restarts the Linux VM	VMM docs
🔵🍎🪟	Re-add bind mount shares if prompted	Docker VMM doesn't auto-share folders like older backends	VMM docs

🛠️ Verify & Diagnose from the CLI

Once switched, confirm the engine actually restarted cleanly and pull logs if anything looks off — no need to leave the terminal.

# Restart Docker Desktop after a manual engine change
docker desktop restart

Restarting Docker Desktop...
Docker Desktop is running

Reference: docker desktop restart

# Confirm the installed Docker Desktop version supports VMM (needs 4.86+)
docker desktop version

Docker Desktop 4.87.0 (198327)

Reference: docker desktop version

# Something feels off? Pull a full diagnostic bundle
docker desktop diagnose

Running diagnostics...
Diagnostics ID: 01ABCD23-4567-89EF-GHIJ-KLMNOPQRSTUV
Uploaded, ID above — share with Docker support if filing an issue

Reference: docker desktop diagnose

# Tail live Desktop logs while reproducing an issue
docker desktop logs -f

Reference: docker desktop logs

⚠️ Known Beta Limitations

	Limitation	Details
🟣🍎	No Rosetta support (Mac)	Emulating amd64 images is slow; stick with Apple Virt. Framework for x86 workloads
🟣🍎	virtiofs + certain databases	MongoDB and Cassandra may fail under Docker VMM's virtiofs; fix expected in a future release
🔵🍎🪟	Restart sometimes required	Switching engines may need a manual `docker desktop restart`

✅ Key Takeaways

A VMM is the hidden layer that creates the Linux VM your containers actually run in — Docker now owns that layer instead of borrowing it.
Docker VMM is opt-in beta today (v4.86+), becoming the default at GA, targeted for end of October 2026.
Expect faster container startup, better file I/O, and smarter idle memory handling — especially noticeable in edit-compile-test loops.
Mac users on Intel emulation (Rosetta) and certain databases under virtiofs should hold off until known issues are resolved.
Switching back to your old backend is one settings toggle away — this is safe to try today.

💬 What Should I Cover Next?

Vote in the comments: Docker VMM vs WSL2 benchmarks · Migrating a MongoDB dev setup off virtiofs · Docker Desktop resource tuning · Docker Model Runner · Docker Sandboxes for AI agents. Tell me which and it's next.

Tags: docker devops virtualization beginners DeveloperProductivity
Hashtags: #Docker #DevOps #CloudNative #DockerDesktop #PlatformEngineering #BuildInPublic #100DaysOfCode
Mentions: @Docker @dev_community @DockerCon

📚 References

Docker — Announcing: Docker VMM Public Beta
Docker — Virtual Machine Manager docs
Hacker News — Discussion: Docker Sandboxes & the new Docker VMM architecture
Collabnix — Difference between VM vs Docker

✍️ About the Author

Padhmeni Priya R R — Bioinformatics Master's grad working as a research scientist on cutting-edge variant analysis tools, endlessly curious about technology and AI-driven innovation.
🔗 linkedin.com/in/padhmeni

Drop a 🐳 if this saved you a search, and tell me what to cover next.

50 Docker Commands That Will Make You Unstoppable in 2026 🐳⚡

Padhmeni Priya R R — Wed, 12 Aug 2026 09:48:30 +0000

You've googled "docker command to remove stopped containers" at 2 AM. This post ends that cycle — with diagrams, not just a wall of text — for beginners and pros alike.

🧠 Core Concepts

Term	What it is
Image	Read-only blueprint of your app — the recipe.
Container	A running instance of an image — the cooked dish.
Registry	Remote image storage, e.g. Docker Hub.
Volume	Persistent storage that survives container deletion.
Network	Virtual wire letting containers talk by name.

Try this now: docker run -d -p 8080:80 nginx, then open localhost:8080. That's a real server running in a container.

📦 Images

🟢 Beginner 🔵 Intermediate 🟣 Advanced

	Command	Purpose	Docs
🟢	`docker build -t app .`	Builds an image from a Dockerfile	build
🔵	`docker build --no-cache`	Rebuilds ignoring cached layers	build
🟢	`docker images`	Lists all local images	ls
🟢	`docker rmi app`	Deletes a local image	rm
🔵	`docker image prune`	Removes dangling, untagged images	prune
🔵	`docker image prune -a`	Removes all unused images	prune
🟢	`docker pull nginx`	Downloads an image from a registry	pull
🔵	`docker push user/app`	Uploads an image to a registry	push
🟢	`docker tag app user/app`	Renames or versions an image	tag
🟣	`docker inspect app`	Shows full image metadata as JSON	inspect

Further reading: Docker cheat sheet · Collabnix · HN

🚀 Containers

	Command	Purpose	Docs
🟢	`docker run nginx`	Creates and starts a container	run
🟢	`docker run -d nginx`	Runs a container in the background	run
🟢	`docker run --name web nginx`	Runs a container with a custom name	run
🟢	`docker run -p 8080:80 nginx`	Maps a host port to a container	run
🔵	`docker run -it ubuntu bash`	Runs a container with a live shell	run
🟢	`docker ps`	Lists running containers	ls
🟢	`docker ps -a`	Lists all containers, including stopped	ls
🟢	`docker stop web`	Gracefully stops a container	stop
🟢	`docker start web`	Restarts a stopped container	start
🟢	`docker restart web`	Stops and starts a container again	restart
🟢	`docker rm web`	Deletes a stopped container	rm
🔵	`docker rm -f web`	Force-removes a running container	rm
🔵	`docker exec -it web bash`	Opens a shell inside a running container	exec
🟢	`docker logs web`	Shows a container's log output	logs
🟢	`docker logs -f web`	Streams logs live	logs

Further reading: Running containers · Collabnix · HN

🧹 Cleanup

	Command	Purpose	Docs
🔵	`docker container prune`	Removes all stopped containers	prune
🔵	`docker network prune`	Removes unused networks	prune
🟣	`docker volume prune`	Removes unused volumes — check data first	prune
🟣	`docker system prune -a`	Removes all unused images/containers/networks	prune
🟣	`docker system prune -a --volumes`	Same, plus wipes volumes — irreversible	prune
🔵	`docker system df`	Shows Docker's disk usage	df
🔵	`docker system df -v`	Shows detailed per-item disk usage	df
🟣	`docker kill $(docker ps -q)`	Force-stops every running container	kill

Further reading: System prune docs · Collabnix · HN

🌐 Networking & Volumes

Containers on the same custom network resolve each other by name — no hardcoded IPs.

	Command	Purpose	Docs
🟢	`docker network ls`	Lists all networks	ls
🔵	`docker network create my-net`	Creates a custom bridge network	create
🔵	`docker network connect my-net web`	Attaches a container to a network	connect
🟣	`docker network inspect my-net`	Shows subnet, driver, connected containers	inspect
🟢	`docker volume create data`	Creates a persistent volume	create
🟢	`docker volume ls`	Lists all volumes	ls
🔵	`docker run -v data:/app nginx`	Mounts a named volume	run
🔵	`docker run -v $(pwd):/app nginx`	Bind-mounts a local folder	run

Further reading: Networking overview · Collabnix · HN

🧩 Compose

Compose replaces five docker run commands with one YAML file.

	Command	Purpose	Docs
🟢	`docker compose up`	Starts all services in docker-compose.yml	up
🟢	`docker compose up -d`	Starts services in the background	up
🟢	`docker compose down`	Stops and removes Compose containers	down
🔵	`docker compose down -v`	Same, plus deletes named volumes	down
🟢	`docker compose logs -f`	Streams logs from all services	logs
🔵	`docker compose up --build`	Rebuilds images before starting	up

Further reading: Compose CLI reference · Collabnix · HN

🛠️ Debugging

	Command	Purpose	Docs
🔵	`docker stats`	Shows live CPU/memory usage per container	stats
🟢	`docker cp web:/app/f.json .`	Copies a file between host and container	cp
🟣	`docker history app`	Shows every layer used to build an image	history

Further reading: Docker CLI reference · Collabnix · HN

✅ Key Takeaways

Images are blueprints, containers are running instances — everything traces back to this.
docker run is your most-used command — master -d -p -v --name -it first.
Cleanup isn't optional. Make docker system prune -a --volumes a habit.
Custom networks give free DNS — containers resolve each other by name.
Compose replaces a wall of docker run commands with one YAML file.
docker logs, exec, and inspect are your debugging trio.
Bookmark this post — you don't need to memorize all 50.

💬 What Should I Cover Next?

Vote in the comments: Compose deep dive · Dockerfile best practices · Advanced networking · Docker security · Docker + Kubernetes. Tell me which and it's next.

Tags: docker devops containers beginners
Hashtags: #Docker #DevOps #CloudNative #100DaysOfCode #PlatformEngineering #Kubernetes #BuildInPublic
Mentions: @Docker @dev_community @github @DockerCon

✍️ About the Author

Drop a 🐳 if this saved you a search, and tell me what to cover next.