Known issues

The Mac Activity Monitor reports that Docker is using twice the amount of memory it's actually using. This is due to a bug in MacOS. We have written a detailed report on this.

Force-ejecting the .dmg after running Docker.app from it can cause the whale icon to become unresponsive, Docker tasks to show as not responding in the Activity Monitor, and for some processes to consume a large amount of CPU resources. Reboot and restart Docker to resolve these issues.

Docker doesn't auto-start after sign in even when it's enabled in Settings. This is related to a set of issues with Docker helper, registration, and versioning.

Docker Desktop uses the HyperKit hypervisor ( https://github.com/docker/hyperkit) in macOS 10.10 Yosemite and higher. If you are developing with tools that have conflicts with HyperKit, such as Intel Hardware Accelerated Execution Manager (HAXM), the current workaround is not to run them at the same time. You can pause HyperKit by quitting Docker Desktop temporarily while you work with HAXM. This allows you to continue work with the other tools and prevent HyperKit from interfering.

If you are working with applications like Apache Maven that expect settings for DOCKER_HOST and DOCKER_CERT_PATH environment variables, specify these to connect to Docker instances through Unix sockets. For example:

$ export DOCKER_HOST=unix:///var/run/docker.sock

There are a number of issues with the performance of directories bind-mounted into containers. In particular, writes of small blocks, and traversals of large directories are currently slow. Additionally, containers that perform large numbers of directory operations, such as repeated scans of large directory trees, may suffer from poor performance. Applications that behave in this way include:

• rake
• ember build
• Symfony
• Magento
• Zend Framework
• PHP applications that use Composer to install dependencies in a vendor folder

As a workaround for this behavior, you can put vendor or third-party library directories in Docker volumes, perform temporary file system operations outside of bind mounts, and use third-party tools like Unison or rsync to synchronize between container directories and bind-mounted directories. We are actively working on performance improvements using a number of different techniques. To learn more, see the topic on our roadmap.

On Apple silicon in native arm64 containers, older versions of libssl such as debian:buster, ubuntu:20.04, and centos:8 will segfault when connected to some TLS servers, for example, curl https://dl.yarnpkg.com. The bug is fixed in newer versions of libssl in debian:bullseye, ubuntu:21.04, and fedora:35.

Some command line tools do not work when Rosetta 2 is not installed.

• The old version 1.x of docker-compose. Use Compose V2 instead - type docker compose.
• The docker-credential-ecr-login credential helper.

Some images do not support the ARM64 architecture. You can add --platform linux/amd64 to run (or build) an Intel image using emulation.

However, attempts to run Intel-based containers on Apple silicon machines under emulation can crash as qemu sometimes fails to run the container. In addition, filesystem change notification APIs (inotify) do not work under qemu emulation. Even when the containers do run correctly under emulation, they will be slower and use more memory than the native equivalent.

In summary, running Intel-based containers on Arm-based machines should be regarded as "best effort" only. We recommend running arm64 containers on Apple silicon machines whenever possible, and encouraging container authors to produce arm64, or multi-arch, versions of their containers. This issue should become less common over time, as more and more images are rebuilt supporting multiple architectures.

ping from inside a container to the Internet does not work as expected. To test the network, use curl or wget. See docker/for-mac#5322.

Users may occasionally experience data drop when a TCP stream is half-closed.