Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsThere is no fixed amount of RAM or disk space that a Linux container uses in WSL. It depends on the image, running processes, workload, files changed inside the container, mounted volumes, and any limits you configure. To get a useful answer for your setup, measure Docker’s object usage and the WSL filesystem separately—and distinguish both from WSL’s overall memory and virtual-disk limits.
Why there is no standard per-container number
WSL 2 runs Linux distributions in a shared Linux virtual machine. With Docker Desktop’s WSL backend, Docker’s engine and container data use a Docker-managed WSL area. A container’s resource use is therefore not the same thing as the total memory shown for the WSL VM or all the disk space assigned to a WSL virtual disk.
The footprint varies with the container’s image and writable changes, its processes and workload, and whether data is stored in mounted volumes. Docker’s official documentation does not give a representative RAM or disk benchmark for a typical Linux container in WSL, so a universal “usual” figure would be misleading.
Memory: WSL VM settings are not container limits
Microsoft documents the WSL 2 memory setting in %UserProfile%.wslconfig as a VM-wide setting. Its documented default is 50% of total Windows memory. The swap default is 25% of Windows memory, rounded up to the nearest GB; swap is disk-backed memory, not RAM. These are defaults for WSL configuration, not measurements of what a container consumes or recommendations for every workload. See Microsoft’s WSL configuration documentation.
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Docker’s --memory option sets a hard memory maximum for an individual container, enforced through Linux cgroups when supported by the kernel and runtime. Docker says containers have no resource constraints by default. For example, start a container with a 1 GiB maximum by adding --memory=1g to its docker run command. That sets a ceiling; it does not mean the container will use 1 GiB. See Docker’s resource-constraints guide and the docker run reference.
To assess current use, observe the running workload with Docker’s live resource reporting or Linux process and memory tools in the relevant environment. Treat the result as a reading from that machine and workload, not as a general WSL figure. If Windows still shows memory in use after an image build, some of it may be cached WSL memory rather than active container demand.
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Disk: distinguish Docker data, filesystem use and virtual capacity
Inspect Docker’s images, containers and volumes
For Docker daemon storage, run docker system df; add -v for detailed image, container and local-volume accounting. The detailed output distinguishes image size shared with other images from unique size. Do not add image totals as if every image layer were stored separately: layers can be shared. The command reports Docker objects, not every file on the Windows drive. See the docker system df reference.
Check the WSL filesystem’s actual free space
Microsoft documents this command for checking a WSL 2 distribution’s filesystem:
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wsl.exe --system -d <distribution-name> df -h /mnt/wslg/distro
If that command is unavailable, Microsoft suggests wsl df -h /. The df output shows filesystem size, used space, available space and percentage used. Use it to check the filesystem you care about; looking inside one user distribution does not necessarily show all Docker Desktop backend storage. See Microsoft’s WSL disk-space guide.
Do not mistake a virtual-disk maximum for current use
Microsoft says WSL 2 virtual hard disks expand as storage needs grow and documents a default maximum capacity of 1 TB for each VHD. The related defaultVhdSize setting controls the maximum for a WSL 2 distribution VHD. That maximum is not the amount a fresh installation immediately occupies on the Windows drive. A full VHD can still cause out-of-space errors, so check actual free space rather than relying on the theoretical maximum.
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- SPACE TO OWN YOUR AI CONTENT – speed and capacity to download your high-res clips and photo edits.
- 256-BIT AES ENCRYPTION(4) – helps keep private files secure with password protection.
Find Docker Desktop’s storage location
Docker Desktop’s WSL 2 backend stores its engine data by default under %LOCALAPPDATA%Dockerwsl. Docker Desktop settings also expose a disk-usage limit and disk-image location. The configured limit, the VHD’s capacity, and the space currently occupied are different measurements. See Docker Desktop’s WSL 2 backend documentation and Docker Desktop settings.
Measure first, then tune or clean up
- For RAM: check the WSL-wide
memoryandswapsettings, then observe the running container workload. Use Docker’s--memoryoption only when you need a per-container hard ceiling. - For disk: use
docker system df -vto inspect Docker objects anddf -hin the relevant WSL filesystem to see capacity and available space. These commands answer different questions. - Before deleting: identify which Docker images, stopped containers or volumes are reclaimable and whether your work still needs them. Docker’s accounting helps you inspect usage before cleanup.
Microsoft’s WSL container tutorial notes that “Images and stopped containers consume disk space” and shows wslc container prune for stopped containers and wslc image prune for unused images. Those commands are for Microsoft’s WSL container CLI, not Docker. Microsoft’s current overview says that CLI requires WSL 2.9.3 or later; see the WSL container overview and the WSL containers tutorial. Docker users should inspect and manage Docker data with Docker’s own CLI.
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- Designed to work with Windows or Mac computers, this external hard drive makes backup a snap just drag and drop
- To get set up, connect the portable hard drive to a computer for automatic recognition software required
- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
- The available storage capacity may vary.
Memory reclamation and WSL configuration
Microsoft lists autoMemoryReclaim as an experimental setting in .wslconfig. Its documented values are disabled, gradual (slowly reclaim cached memory automatically) and dropCache (reclaim cached memory immediately); the documentation lists dropCache as the default. Docker recommends enabling this setting to help Windows reclaim unused WSL memory after container image builds. Reclaiming cache can return memory to Windows, but it does not lower the actual memory demand of an active workload. Because this is an experimental, version-sensitive setting, check the current Microsoft configuration documentation for the syntax and behavior applicable to your WSL version.
.wslconfig applies globally to WSL 2; /etc/wsl.conf configures an individual distribution. Microsoft says configuration changes take effect after WSL stops and restarts. To stop all running distributions before restarting, run wsl --shutdown. Docker’s guidance on reclaiming memory is in its WSL backend documentation.
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