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README.md

Docker-OSX · Follow @sickcodes on Twitter

Run Mac OS X in Docker with near-native performance! X11 Forwarding! iMessage security research! iPhone USB working! macOS in a Docker container!

Conduct Security Research on macOS using both Linux & Windows!

Docker-OSX now has a Discord server & Telegram!

The Discord is active on #docker-osx and anyone is welcome to come and ask questions, ideas, etc.

Click to join the Discord server https://discord.gg/sickchat

Click to join the Telegram server https://t.me/sickcodeschat

Or reach out via Linkedin if it's private: https://www.linkedin.com/in/sickcodes

Or via https://sick.codes/contact/

Author

This project is maintained by Sick.Codes. (Twitter)

Additional credits can be found here: https://github.com/sickcodes/Docker-OSX/blob/master/CREDITS.md

Additionally, comprehensive list of all contributors can be found here: https://github.com/sickcodes/Docker-OSX/graphs/contributors

Big thanks to @kholia for maintaining the upstream project, which Docker-OSX is built on top of: OSX-KVM.

Also special thanks to @thenickdude who maintains the valuable fork KVM-OpenCore, which was started by @Leoyzen!

Extra special thanks to the OpenCore team over at: https://github.com/acidanthera/OpenCorePkg. Their well-maintained bootloader provides much of the great functionality that Docker-OSX users enjoy :)

If you like this project, consider contributing here or upstream!

Quick Start Docker-OSX

Video setup tutorial is also available here: https://www.youtube.com/watch?v=wLezYl77Ll8

Windows users: click here to see the notes below!

First time here? try initial setup, otherwise try the instructions below to use either Catalina or Big Sur.

Any questions, ideas, or just want to hang out?

https://discord.gg/sickchat

Release names and their version:

Catalina (10.15)

docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e SHORTNAME=catalina \
    sickcodes/docker-osx:latest

# docker build -t docker-osx .

Big Sur (11)

docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e SHORTNAME=big-sur \
    sickcodes/docker-osx:latest

# docker build -t docker-osx .

Monterey (12)


docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e GENERATE_UNIQUE=true \
    -e MASTER_PLIST_URL='https://raw.githubusercontent.com/sickcodes/osx-serial-generator/master/config-custom.plist' \
    -e SHORTNAME=monterey \
    sickcodes/docker-osx:latest

# docker build -t docker-osx .

Ventura (13)


docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e GENERATE_UNIQUE=true \
    -e MASTER_PLIST_URL='https://raw.githubusercontent.com/sickcodes/osx-serial-generator/master/config-custom.plist' \
    -e SHORTNAME=ventura \
    sickcodes/docker-osx:latest

# docker build -t docker-osx .

Sonoma (14)


docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e GENERATE_UNIQUE=true \
    -e CPU='Haswell-noTSX' \
    -e CPUID_FLAGS='kvm=on,vendor=GenuineIntel,+invtsc,vmware-cpuid-freq=on' \
    -e MASTER_PLIST_URL='https://raw.githubusercontent.com/sickcodes/osx-serial-generator/master/config-custom-sonoma.plist' \
    -e SHORTNAME=sonoma \
    sickcodes/docker-osx:latest

# docker build -t docker-osx .

Run Catalina Pre-Installed

# 40GB disk space required: 20GB original image 20GB your container.
docker pull sickcodes/docker-osx:auto

# boot directly into a real OS X shell with a visual display [NOT HEADLESS]
docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e GENERATE_UNIQUE=true \
    sickcodes/docker-osx:auto

# username is user
# password is alpine

Older Systems

High Sierra


docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e SHORTNAME=high-sierra \
    sickcodes/docker-osx:latest

# docker build -t docker-osx .

Mojave


docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e SHORTNAME=mojave \
    sickcodes/docker-osx:latest

# docker build -t docker-osx .

Download the image manually and use it in Docker

This is a particularly good way for downloading the container, in case Docker's CDN (or your connection) happens to be slow.

wget https://images2.sick.codes/mac_hdd_ng_auto.img

docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v "${PWD}/mac_hdd_ng_auto.img:/image" \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e GENERATE_UNIQUE=true \
    -e MASTER_PLIST_URL=https://raw.githubusercontent.com/sickcodes/Docker-OSX/master/custom/config-nopicker-custom.plist \
    -e SHORTNAME=catalina \
    sickcodes/docker-osx:naked

Use your own image and manually and automatically log into a shell

Enable SSH in network sharing inside the guest first. Change -e "USERNAME=user" and -e "PASSWORD=password" to your credentials. The container will add itself to ~/.ssh/authorized_keys

Since you can't see the screen, use the PLIST with nopicker, for example:

# Catalina
# wget https://images2.sick.codes/mac_hdd_ng_auto.img
# Monterey
wget https://images.sick.codes/mac_hdd_ng_auto_monterey.img

docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v "${PWD}/mac_hdd_ng_auto_monterey.img:/image" \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e "USERNAME=user" \
    -e "PASSWORD=alpine" \
    -e GENERATE_UNIQUE=true \
    -e MASTER_PLIST_URL=https://raw.githubusercontent.com/sickcodes/Docker-OSX/master/custom/config-nopicker-custom.plist \
    -e SHORTNAME=monterey \
    sickcodes/docker-osx:naked-auto

The easiest and most secure way is sshfs

# on Linux/Windows
mkdir ~/mnt/osx
sshfs user@localhost:/ -p 50922 ~/mnt/osx
# wait a few seconds, and ~/mnt/osx will have full rootfs mounted over ssh, and in userspace
# automated: sshpass -p <password> sshfs user@localhost:/ -p 50922 ~/mnt/osx

(VFIO) iPhone USB passthrough (VFIO)

If you have a laptop see the next usbfluxd section.

If you have a desktop PC, you can use @Silfalion's instructions: https://github.com/Silfalion/Iphone_docker_osx_passthrough

(USBFLUXD) iPhone USB -> Network style passthrough OSX-KVM Docker-OSX

Video setup tutorial for usbfluxd is also available here: https://www.youtube.com/watch?v=kTk5fGjK_PM

This method WORKS on laptop, PC, anything!

Thank you @nikias for usbfluxd via https://github.com/corellium!

This is done inside Linux.

Open 3 terminals on Linux

Connecting your device over USB on Linux allows you to expose usbmuxd on port 5000 using https://github.com/corellium/usbfluxd to another system on the same network.

Ensure usbmuxd, socat and usbfluxd are installed.

sudo pacman -S libusbmuxd usbmuxd avahi socat

Available on the AUR: https://aur.archlinux.org/packages/usbfluxd/

yay usbfluxd

Plug in your iPhone or iPad.

Terminal 1

sudo systemctl start usbmuxd
sudo avahi-daemon

Terminal 2:

# on host
sudo systemctl restart usbmuxd
sudo socat tcp-listen:5000,fork unix-connect:/var/run/usbmuxd

Terminal 3:

sudo usbfluxd -f -n

Connect to a host running usbfluxd

This is done inside macOS.

Install homebrew.

172.17.0.1 is usually the Docker bridge IP, which is your PC, but you can use any IP from ip addr...

macOS Terminal:

# on the guest
brew install make automake autoconf libtool pkg-config gcc libimobiledevice usbmuxd

git clone https://github.com/corellium/usbfluxd.git
cd usbfluxd

./autogen.sh
make
sudo make install

Accept the USB over TCP connection, and appear as local:

(you may need to change 172.17.0.1 to the IP address of the host. e.g. check ip addr)

# on the guest
sudo launchctl start usbmuxd
export PATH=/usr/local/sbin:${PATH}
sudo usbfluxd -f -r 172.17.0.1:5000

Close apps such as Xcode and reopen them and your device should appear!

If you need to start again on Linux, wipe the current usbfluxd, usbmuxd, and socat:

sudo killall usbfluxd
sudo systemctl restart usbmuxd
sudo killall socat

Make container FASTER using https://github.com/sickcodes/osx-optimizer

SEE commands in https://github.com/sickcodes/osx-optimizer!

Skip the GUI login screen (at your own risk!)
Disable spotlight indexing on macOS to heavily speed up Virtual Instances.
Disable heavy login screen wallpaper
Disable updates (at your own risk!)

Increase disk space by moving /var/lib/docker to external drive, block storage, NFS, or any other location conceivable.

Move /var/lib/docker, following the tutorial below

Cheap large physical disk storage instead using your server's disk, or SSD.
Block Storage, NFS, etc.

Tutorial here: https://sick.codes/how-to-run-docker-from-block-storage/

Only follow the above tutorial if you are happy with wiping all your current Docker images/layers.

Safe mode: Disable docker temporarily so you can move the Docker folder temporarily.

Do NOT do this until you have moved your image out already https://github.com/dulatello08/Docker-OSX/#quick-start-your-own-image-naked-container-image

killall dockerd
systemctl disable --now docker
systemctl disable --now docker.socket
systemctl stop docker
systemctl stop docker.socket

Now, that Docker daemon is off, move /var/lib/docker somewhere

Then, symbolicly link /var/lib/docker somewhere:

mv /var/lib/docker /run/media/user/some_drive/docker
ln -s /run/media/user/some_drive/docker /var/lib/docker

# now check if /var/lib/docker is working still
ls /var/lib/docker

If you see folders, then it worked. You can restart Docker, or just reboot if you want to be sure.

Important notices:

2021-11-14 - Added High Sierra, Mojave

Pick one of these while building, irrelevant when using docker pull:

--build-arg SHORTNAME=high-sierra 
--build-arg SHORTNAME=mojave
--build-arg SHORTNAME=catalina
--build-arg SHORTNAME=big-sur
--build-arg SHORTNAME=monterey
--build-arg SHORTNAME=ventura
--build-arg SHORTNAME=sonoma

Technical details

There are currently multiple images, each with different use cases (explained below):

High Sierra (10.13)
Mojave (10.14)
Catalina (10.15)
Big Sur (11)
Monterey (12)
Ventura (13)
Sonoma (14)
Auto (pre-made Catalina)
Naked (use your own .img)
Naked-Auto (user your own .img and SSH in)

High Sierra:

Mojave:

Catalina:

Big-Sur:

Monterey make your own image:

Ventura make your own image:

Sonoma make your own image:

Pre-made Catalina system by Sick.Codes: username: user, password: alpine

Naked: Bring-your-own-image setup (use any of the above first):

Naked Auto: same as above but with -e USERNAME & -e PASSWORD and -e OSX_COMMANDS="put your commands here"

Capabilities

use iPhone OSX KVM on Linux using usbfluxd!
macOS Monterey VM on Linux!
Folder sharing-
USB passthrough (hotplug too)
SSH enabled (localhost:50922)
VNC enabled (localhost:8888) if using ./vnc version
iMessage security research via serial number generator!
X11 forwarding is enabled
runs on top of QEMU + KVM
supports Big Sur, custom images, Xvfb headless mode
you can clone your container with docker commit

Requirements

20GB+++ disk space for bare minimum installation (50GB if using Xcode)
virtualization should be enabled in your BIOS settings
a x86_64 kvm-capable host
at least 50 GBs for :auto (half for the base image, half for your runtime image

TODO

documentation for security researchers
gpu acceleration
support for virt-manager

Docker

Images built on top of the contents of this repository are also available on Docker Hub for convenience: https://hub.docker.com/r/sickcodes/docker-osx

A comprehensive list of the available Docker images and their intended purpose can be found in the Instructions.

Kubernetes

Docker-OSX supports Kubernetes.

Kubernetes Helm Chart & Documentation can be found under the helm directory.

Thanks cephasara for contributing this major contribution.

Support

Small questions & issues

Feel free to open an issue, should you come across minor issues with running Docker-OSX or have any questions.

Resolved issues

Before you open an issue, however, please check the closed issues and confirm that you're using the latest version of this repository — your issues may have already been resolved! You might also see your answer in our questions and answers section below.

Feature requests and updates

Follow @sickcodes!

Professional support

For more sophisticated endeavours, we offer the following support services:

Enterprise support, business support, or casual support.
Custom images, custom scripts, consulting (per hour available!)
One-on-one conversations with you or your development team.

In case you're interested, contact @sickcodes on Twitter or click here.

License/Contributing

Docker-OSX is licensed under the GPL v3+. Contributions are welcomed and immensely appreciated. You are in fact permitted to use Docker-OSX as a tool to create proprietary software.

Other cool Docker/QEMU based projects

Disclaimer

If you are serious about Apple Security, and possibly finding 6-figure bug bounties within the Apple Bug Bounty Program, then you're in the right place! Further notes: Is Hackintosh, OSX-KVM, or Docker-OSX legal?

Product names, logos, brands and other trademarks referred to within this project are the property of their respective trademark holders. These trademark holders are not affiliated with our repository in any capacity. They do not sponsor or endorse this project in any way.

Instructions

Container images

Already set up or just looking to make a container quickly? Check out our quick start or see a bunch more use cases under our container creation examples section.

There are several different Docker-OSX images available that are suitable for different purposes.

sickcodes/docker-osx:latest - I just want to try it out.
sickcodes/docker-osx:latest - I want to use Docker-OSX to develop/secure apps in Xcode (sign into Xcode, Transporter)
sickcodes/docker-osx:naked - I want to use Docker-OSX for CI/CD-related purposes (sign into Xcode, Transporter)

Create your personal image using :latest or big-sur. Then, pull the image out the image. Afterwards, you will be able to duplicate that image and import it to the :naked container, in order to revert the container to a previous state repeatedly.

sickcodes/docker-osx:auto - I'm only interested in using the command line (useful for compiling software or using Homebrew headlessly).
sickcodes/docker-osx:naked - I need iMessage/iCloud for security research.
sickcodes/docker-osx:big-sur - I want to run Big Sur.
sickcodes/docker-osx:monterey - I want to run Monterey.
sickcodes/docker-osx:ventura - I want to run Ventura.
sickcodes/docker-osx:sonoma - I want to run Sonoma.
sickcodes/docker-osx:high-sierra - I want to run High Sierra.
sickcodes/docker-osx:mojave - I want to run Mojave.

Initial setup

Before you do anything else, you will need to turn on hardware virtualization in your BIOS. Precisely how will depend on your particular machine (and BIOS), but it should be straightforward.

Then, you'll need QEMU and some other dependencies on your host:

# ARCH
sudo pacman -S qemu libvirt dnsmasq virt-manager bridge-utils flex bison iptables-nft edk2-ovmf

# UBUNTU DEBIAN
sudo apt install qemu qemu-kvm libvirt-clients libvirt-daemon-system bridge-utils virt-manager libguestfs-tools

# CENTOS RHEL FEDORA
sudo yum install libvirt qemu-kvm

Then, enable libvirt and load the KVM kernel module:

sudo systemctl enable --now libvirtd
sudo systemctl enable --now virtlogd

echo 1 | sudo tee /sys/module/kvm/parameters/ignore_msrs

sudo modprobe kvm

I'd like to run Docker-OSX on Windows

Running Docker-OSX on Windows is possible using WSL2 (Windows 11 + Windows Subsystem for Linux).

You must have Windows 11 installed with build 22000+ (21H2 or higher).

First, install WSL on your computer by running this command in an administrator powershell. For more info, look here.

This will install Ubuntu by default.

wsl --install

You can confirm WSL2 is enabled using wsl -l -v in PowerShell. To see other distributions that are available, use wsl -l -o.

If you have previously installed WSL1, upgrade to WSL 2. Check this link to upgrade from WSL1 to WSL2.

After WSL installation, go to C:/Users/<Your_Name>/.wslconfig and add nestedVirtualization=true to the end of the file (If the file doesn't exist, create it). For more information about the .wslconfig file check this link. Verify that you have selected "Show Hidden Files" and "Show File Extensions" in File Explorer options. The result should be like this:

[wsl2]
nestedVirtualization=true

Then you can choose to directly run Docker-OSX in powershell or run it in WSL distros.

Run in powershell

Download and install Docker for Windows if it is not already installed.

Then go into Settings and check a box:

General -> "Use the WSL2 based engine";

Next, run the following command in powershell(we run Ventura here as an example):

docker run  --device /dev/kvm    -v /run/desktop/mnt/host/wslg/.X11-unix:/tmp/.X11-unix -v /run/desktop/mnt/host/wslg:/mnt/wslg   -e DISPLAY=:0 sickcodes/docker-osx:ventura

It points Docker-OSX to wslg in docker-desktop (a special distro created by Docker Desktop) and run Docker-OSX.

Run in distros

Go into your WSL distro (Run wsl in powershell) and check if KVM is enabled by using the kvm-ok command. The output should look like this:

INFO: /dev/kvm exists
KVM acceleration can be used

Use the command sudo apt -y install bridge-utils cpu-checker libvirt-clients libvirt-daemon qemu qemu-kvm to install it if it isn't.

Now download and install Docker for Windows if it is not already installed.

After installation, go into Settings and check these 2 boxes:

General -> "Use the WSL2 based engine";
Resources -> WSL Integration -> "Enable integration with my default WSL distro",

Ensure x11-apps is installed. Use the command sudo apt install x11-apps -y to install it if it isn't.

Finally, there are 3 ways to get video output:

WSLg: This is the simplest and easiest option to use. There may be some issues such as the keyboard not being fully passed through or seeing a second mouse on the desktop - Issue on WSLg - but this option is recommended.

To use WSLg's built-in X-11 server, change these two lines in the docker run command to point Docker-OSX to WSLg.

-e "DISPLAY=${DISPLAY:-:0.0}" \
-v /mnt/wslg/.X11-unix:/tmp/.X11-unix \

Or try:

-e "DISPLAY=${DISPLAY:-:0}" \
-v /mnt/wslg/.X11-unix:/tmp/.X11-unix \

For Ubuntu 20.x on Windows, see https://github.com/sickcodes/Docker-OSX/discussions/458

VNC: See the VNC section for more information. You could also add -vnc argument to qemu. Connect to your mac VM via a VNC Client. Here is a how to
Desktop Environment: This will give you a full desktop linux experience but it will use a bit more of the computer's resources. Here is an example guide, but there are other guides that help set up a desktop environment. DE Example

Additional boot instructions for when you are creating your container

Boot the macOS Base System (Press Enter)
Click Disk Utility
Erase the BIGGEST disk (around 200gb default), DO NOT MODIFY THE SMALLER DISKS. -- if you can't click erase, you may need to reduce the disk size by 1kb
(optional) Create a partition using the unused space to house the OS and your files if you want to limit the capacity. (For Xcode 12 partition at least 60gb.)
Click Reinstall macOS
The system may require multiple reboots during installation

Troubleshooting

Routine checks

This is a great place to start if you are having trouble getting going, especially if you're not that familiar with Docker just yet.

Just looking to make a container quickly? Check out our container creation examples section.

More specific/advanced troubleshooting questions and answers may be found in More Questions and Answers. You should also check out the closed issues. Someone else might have gotten a question like yours answered already even if you can't find it in this document!

Confirm that your CPU supports virtualization

See initial setup.

Docker Unknown Server OS error

docker: unknown server OS: .
See 'docker run --help'.

This means your docker daemon is not running.

pgrep dockerd should return nothing

Therefore, you have a few choices.

sudo dockerd for foreground Docker usage. I use this.

sudo systemctl --start dockerd to start dockerd this now.

sudo systemctl --enable --now dockerd for start dockerd on every reboot, and now.

Use more CPU Cores/SMP

Examples:

-e EXTRA='-smp 6,sockets=3,cores=2'

-e EXTRA='-smp 8,sockets=4,cores=2'

-e EXTRA='-smp 16,sockets=8,cores=2'

Note, unlike memory, CPU usage is shared. so you can allocate all of your CPU's to the container.

Confirm your user is part of the Docker group, KVM group, libvirt group

Add yourself to the Docker group

If you use sudo dockerd or dockerd is controlled by systemd/systemctl, then you must be in the Docker group. If you are not in the Docker group:

sudo usermod -aG docker "${USER}"

and also add yourself to the kvm and libvirt groups if needed:

sudo usermod -aG libvirt "${USER}"
sudo usermod -aG kvm "${USER}"

Is the docker daemon enabled?

# run ad hoc
sudo dockerd

# or daemonize it
sudo nohup dockerd &

# enable it in systemd (it will persist across reboots this way)
sudo systemctl enable --now docker

# or just start it as your user with systemd instead of enabling it
systemctl start docker

Mount USB Drive (Hotplug/Hot Plug USB)

Start your container.

Pick a port, for example, 7700.

lsusb to get vid:pid

On Linux: sudo usbredirserver -p 7700 1e3d:2096

Now, in the Docker window hit Enter to see the (qemu) console.

You can add/remove the disk using commands like this, even once the machine is started:

chardev-add socket,id=usbredirchardev1,port=7700,host=172.17.0.1

device_add usb-redir,chardev=usbredirchardev1,id=usbredirdev1,debug=4

Mount USB Drive inside macOS at boot Docker OSX

PORT=7700
IP_ADDRESS=172.17.0.1

-e EXTRA="-chardev socket,id=usbredirchardev1,port=${PORT},host=${IP_ADDRESS} -device usb-redir,chardev=usbredirchardev1,id=usbredirdev1,debug=4" \`

Fedora: enable internet connectivity with a bridged network

Fedora's default firewall settings may prevent Docker's network interface from reaching the internet. In order to resolve this, you will need to whitelist the interface in your firewall:

# Set the docker0 bridge to the trusted zone
sudo firewall-cmd --permanent --zone=trusted --add-interface=docker0
sudo firewall-cmd --reload

Nested Hardware Virtualization

Check if your machine has hardware virtualization enabled:

sudo tee /sys/module/kvm/parameters/ignore_msrs <<< 1

egrep -c '(svm|vmx)' /proc/cpuinfo

Virtual network adapters

Fast internet connectivity

-e NETWORKING=vmxnet3

Slow internet connectivity

-e NETWORKING=e1000-82545em

Tips for reducing the size of the image

Start the container as usual, and remove unnecessary files. A useful way to do this is to use du -sh * starting from the / directory, and find large directories where files can be removed. E.g. unnecessary cached files, Xcode platforms, etc.
Once you are satisfied with the amount of free space, enable trim with sudo trimforce enable, and reboot.
Zero out the empty space on the disk with dd if=/dev/zero of=./empty && rm -f empty
Shut down the VM and copy out the qcow image with docker cp stoppedcontainer:/home/arch/OSX-KVM/mac_hdd_ng.img .
Run qemu-img check -r all mac_hdd_ng.img to fix any errors.
Run qemu-img convert -O qcow2 mac_hdd_ng.img deduped.img and check for errors again
OPTIONAL: Run qemu-img convert -c -O qcow2 deduped.img compressed.img to further compress the image. This may reduce the runtime speed though, but it should reduce the size by roughly 25%.
Check for errors again, and build a fresh docker image. E.g. with this Dockerfile

FROM sickcodes/docker-osx
USER arch
COPY --chown=arch ./deduped.img /home/arch/OSX-KVM/mac_hdd_ng.img

Run Docker-OSX headlessly with Telnet

First make sure autoboot is enabled

Next, you will want to set up SSH to be automatically started.

sudo systemsetup -setremotelogin on

Make sure to commit the new docker image and save it, or rebuild as described in the section on reducing disk space.

Then run it with these arguments.

# Run with the -nographic flag, and enable a telnet interface
  docker run \
    --device /dev/kvm \
    -p 50922:10022 \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e EXTRA="-monitor telnet::45454,server,nowait -nographic -serial null" \
    mycustomimage

What mirrors are appropriate to use to build Docker-OSX locally?

If you are building Docker-OSX locally, you'll probably want to use Arch Linux's mirrors.

Mirror locations can be found here (uses two-letter country codes): https://archlinux.org/mirrorlist/all/

docker build -t docker-osx:latest \
    --build-arg RANKMIRRORS=true \
    --build-arg MIRROR_COUNTRY=US \
    --build-arg MIRROR_COUNT=10 \
    --build-arg SHORTNAME=catalina \
    --build-arg SIZE=200G .

Custom QEMU Arguments (passthrough devices)

Pass any devices/directories to the Docker container & the QEMU arguments using the handy runtime argument provider option -e EXTRA=.

# example customizations
docker run \
    -e RAM=4 \
    -e SMP=4 \
    -e CORES=4 \
    -e EXTRA='-usb -device usb-host,hostbus=1,hostaddr=8' \
    -e INTERNAL_SSH_PORT=23 \
    -e MAC_ADDRESS="$(xxd -c1 -p -l 6 /dev/urandom | tr '\n' ':' | cut -c1-17)" \
    -e AUDIO_DRIVER=alsa \
    -e IMAGE_PATH=/image \
    -e SCREEN_SHARE_PORT=5900 \
    -e DISPLAY=:0 \
    -e NETWORKING=vmxnet3 \
    --device /dev/kvm \
    --device /dev/snd \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    docker-osx:latest

Generating serial numbers

Generate serial numbers in ./custom OR make docker generate them at runtime (see below).

At any time, verify your serial number before logging into iCloud, etc.

# this is a quick way to check your serial number via cli inside OSX
ioreg -l | grep IOPlatformSerialNumber

# test some commands
sshpass -p 'alpine' ssh user@localhost -p 50922 'ping google.com'

# check your serial number
sshpass -p 'alpine' ssh user@localhost -p 50922 'ioreg -l | grep IOPlatformSerialNumber'

Getting started with serial numbers

# ARCH
pacman -S libguestfs

# UBUNTU DEBIAN
apt install libguestfs -y

# RHEL FEDORA CENTOS
yum install libguestfs -y

Inside the ./custom folder you will find 4 scripts.

config-nopicker-custom.plist
opencore-image-ng.sh

These two files are from OSX-KVM.

You don't need to touch these two files.

The config.plist has 5 values replaced with placeholders. Click here to see those values for no reason.

generate-unique-machine-values.sh This script will generate serial numbers, with Mac Addresses, plus output to CSV/TSV, plus make a bootdisk image.

You can create hundreds, ./custom/generate-unique-machine-values.sh --help

./custom/generate-unique-machine-values.sh \
    --count 1 \
    --tsv ./serial.tsv \
    --bootdisks \
    --output-bootdisk OpenCore.qcow2 \
    --output-env source.env.sh

Or if you have some specific serial numbers...

generate-specific-bootdisk.sh

generate-specific-bootdisk.sh \
    --model "${DEVICE_MODEL}" \
    --serial "${SERIAL}" \
    --board-serial "${BOARD_SERIAL}" \
    --uuid "${UUID}" \
    --mac-address "${MAC_ADDRESS}" \
    --output-bootdisk OpenCore-nopicker.qcow2

This example generates a random set of serial numbers at runtime, headlessly

# proof of concept only, generates random serial numbers, headlessly, and quits right after.
docker run --rm -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -e NOPICKER=true \
    -e GENERATE_UNIQUE=true \
    -e DEVICE_MODEL="iMacPro1,1" \
    sickcodes/docker-osx:auto

# -e OSX_COMMANDS='ioreg -l | grep IOPlatformSerialNumber' \

This example generates a specific set of serial numbers at runtime

# run the same as above 17gb auto image, with SSH, with nopicker, and save the bootdisk for later.
# you don't need to save the bootdisk IF you supply specific serial numbers!

docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -e NOPICKER=true \
    -e GENERATE_SPECIFIC=true \
    -e DEVICE_MODEL="iMacPro1,1" \
    -e SERIAL="C02TW0WAHX87" \
    -e BOARD_SERIAL="C027251024NJG36UE" \
    -e UUID="5CCB366D-9118-4C61-A00A-E5BAF3BED451" \
    -e MAC_ADDRESS="A8:5C:2C:9A:46:2F" \
    -e OSX_COMMANDS='ioreg -l | grep IOPlatformSerialNumber' \
    sickcodes/docker-osx:auto

This example generates a specific set of serial numbers at runtime, with your existing image, at 1000x1000 display resolution

# run an existing image in current directory, with a screen, with SSH, with nopicker.

stat mac_hdd_ng.img # make sure you have an image if you're using :naked

docker run -it \
    -v "${PWD}/mac_hdd_ng.img:/image" \
    --device /dev/kvm \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -p 50922:10022 \
    -e NOPICKER=true \
    -e GENERATE_SPECIFIC=true \
    -e DEVICE_MODEL="iMacPro1,1" \
    -e SERIAL="C02TW0WAHX87" \
    -e BOARD_SERIAL="C027251024NJG36UE" \
    -e UUID="5CCB366D-9118-4C61-A00A-E5BAF3BED451" \
    -e MAC_ADDRESS="A8:5C:2C:9A:46:2F" \
    -e WIDTH=1000 \
    -e HEIGHT=1000 \
    sickcodes/docker-osx:naked

If you want to generate serial numbers, either make them at runtime using -e GENERATE_UNIQUE=true \

Or you can generate them inside the ./custom folder. And then use:

    -e GENERATE_SPECIFIC=true \
    -e SERIAL="" \
    -e BOARD_SERIAL="" \
    -e UUID="" \
    -e MAC_ADDRESS="" \

Making serial numbers persist across reboots


stat mac_hdd_ng_testing.img
touch ./output.env

# generate fresh random serial numbers, with a screen, using your own image, and save env file with your new serial numbers for later.

docker run -it \
    --device /dev/kvm \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -p 50922:10022 \
    -e NOPICKER=true \
    -e GENERATE_UNIQUE=true \
    -e GENERATE_SPECIFIC=true \
    -e DEVICE_MODEL="iMacPro1,1" \
    -v "${PWD}/output.env:/env" \
    -v "${PWD}/mac_hdd_ng_testing.img:/image" \
    sickcodes/docker-osx:naked

To use iMessage or iCloud you need to change 5 values.

SERIAL
BOARD_SERIAL
UUID
MAC_ADDRESS

ROM is just the lowercased mac address, without : between each word.

You can tell the container to generate them for you using -e GENERATE_UNIQUE=true

Or tell the container to use specific ones using -e GENERATE_SPECIFIC=true

    -e GENERATE_SPECIFIC=true \
    -e DEVICE_MODEL="iMacPro1,1" \
    -e SERIAL="C02TW0WAHX87" \
    -e BOARD_SERIAL="C027251024NJG36UE" \
    -e UUID="5CCB366D-9118-4C61-A00A-E5BAF3BED451" \
    -e MAC_ADDRESS="A8:5C:2C:9A:46:2F" \

Changing display resolution

The display resolution is controlled by this line:

https://github.com/sickcodes/Docker-OSX/blob/master/custom/config-nopicker-custom.plist#L819

Instead of mounting that disk, Docker-OSX will generate a new OpenCore.qcow2 by using this one cool trick:

-e GENERATE_UNIQUE=true \
-e WIDTH=800 \
-e HEIGHT=600 \

To use WIDTH/HEIGHT, you must use with either -e GENERATE_UNIQUE=true or -e GENERATE_SPECIFIC=true.

It will take around 30 seconds longer to boot because it needs to make a new boot partition using libguestfs.

-e GENERATE_SPECIFIC=true \
-e WIDTH=1920 \
-e HEIGHT=1080 \
-e SERIAL="" \
-e BOARD_SERIAL="" \
-e UUID="" \
-e MAC_ADDRESS="" \

Change Docker-OSX Resolution Examples

# using an image in your current directory
stat mac_hdd_ng.img

docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v "${PWD}/mac_hdd_ng.img:/image" \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e GENERATE_SPECIFIC=true \
    -e DEVICE_MODEL="iMacPro1,1" \
    -e SERIAL="C02TW0WAHX87" \
    -e BOARD_SERIAL="C027251024NJG36UE" \
    -e UUID="5CCB366D-9118-4C61-A00A-E5BAF3BED451" \
    -e MAC_ADDRESS="A8:5C:2C:9A:46:2F" \
    -e MASTER_PLIST_URL=https://raw.githubusercontent.com/sickcodes/Docker-OSX/master/custom/config-nopicker-custom.plist \
    -e WIDTH=1600 \
    -e HEIGHT=900 \
    sickcodes/docker-osx:naked

# generating random serial numbers, using the DIY installer, along with the screen resolution changes.
docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e GENERATE_UNIQUE=true \
    -e WIDTH=800 \
    -e HEIGHT=600 \
    sickcodes/docker-osx:latest

Here's a few other resolutions! If your resolution is invalid, it will default to 800x600.

    -e WIDTH=800 \
    -e HEIGHT=600 \

    -e WIDTH=1280 \
    -e HEIGHT=768 \

    -e WIDTH=1600 \
    -e HEIGHT=900 \

    -e WIDTH=1920 \
    -e HEIGHT=1080 \

    -e WIDTH=2560 \
    -e HEIGHT=1600 \

This example shows how to change resolution after the container is created.

First step is to stop the docker daemon

sudo systemctl stop docker

The second step is to change container config in

/var/lib/docker/containers/[container-id]/config.v2.json

(Suppose your original WIDTH is 1024 and HEIGHT is 768, you can search 1024 and replace it with the new value. Same for 768.)

The last step is to restart the docker daemon

sudo systemctl restart docker

Mounting physical disks in Mac OSX

Pass the disk into the container as a volume and then pass the disk again into QEMU command line extras with.

Use the config-custom.plist because you probably want to see the boot menu, otherwise omit the first line:

DISK_TWO="${PWD}/mount_me.img"

-e MASTER_PLIST_URL='https://raw.githubusercontent.com/sickcodes/osx-serial-generator/master/config-custom.plist' \
-v "${DISK_TWO}:/disktwo" \
-e EXTRA='-device ide-hd,bus=sata.5,drive=DISK-TWO -drive id=DISK-TWO,if=none,file=/disktwo,format=qcow2' \

Physical disk mounting example

OSX_IMAGE="${PWD}/mac_hdd_ng_xcode_bigsur.img"
DISK_TWO="${PWD}/mount_me.img"

docker run -it \
    --device /dev/kvm \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e MASTER_PLIST_URL='https://raw.githubusercontent.com/sickcodes/osx-serial-generator/master/config-custom.plist' \
    -v "${OSX_IMAGE}":/image \
    -v "${DISK_TWO}":/disktwo \
    -e EXTRA='-device ide-hd,bus=sata.5,drive=DISK-TWO -drive id=DISK-TWO,if=none,file=/disktwo,format=qcow2' \
    sickcodes/docker-osx:naked

Extracting the APFS disk on Linux

In Docker-OSX, we are using qcow2 images.

This means the image grows as you use it, but the guest OS thinks you have 200GB available.

READ ONLY

# mount the qemu image like a real disk
sudo modprobe nbd max_part=8
sudo qemu-nbd --connect=/dev/nbd0 ./image.img
sudo fdisk /dev/nbd0 -l

mkdir -p ./mnt
sudo mount /dev/nbd0p1 ./mnt

# inspect partitions (2 partitions)
sudo fdisk /dev/nbd0 -l

# mount using apfs-linux-rw OR apfs-fuse
mkdir -p ./part

sudo mount /dev/nbd0p2 ./part
sudo apfs-fuse -o allow_other /dev/nbd0p2 ./part

When you are finishing looking at your disk, you can unmount the partition, the disk, and remove the loopback device:

sudo umount ./part
sudo umount ./mnt
sudo qemu-nbd --disconnect /dev/nbd0
sudo rmmod nbd

USB Passthrough

Firstly, QEMU must be started as root.

It is also potentially possible to accomplish USB passthrough by changing the permissions of the device in the container. See here.

For example, create a new Dockerfile with the following

FROM sickcodes/docker-osx
USER arch
RUN sed -i -e s/exec\ qemu/exec\ sudo\ qemu/ ./Launch.sh
COPY --chown=arch ./new_image.img /home/arch/OSX-KVM/mac_hdd_ng.img

Where new_image.img is the qcow2 image you extracted. Then rebuild with docker build .

Next we need to find out the bus and port numbers of the USB device we want to pass through to the VM:

lsusb -t
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M
    |__ Port 2: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 2: Dev 5, If 1, Class=Chip/SmartCard, Driver=, 12M
    |__ Port 3: Dev 2, If 0, Class=Wireless, Driver=, 12M
    |__ Port 3: Dev 2, If 1, Class=Wireless, Driver=, 12M
    |__ Port 5: Dev 3, If 0, Class=Video, Driver=uvcvideo, 480M
    |__ Port 5: Dev 3, If 1, Class=Video, Driver=uvcvideo, 480M

In this example, we want to pass through a smartcard device. The device we want is on bus 1 and port 2.

There may also be differences if your device is usb 2.0 (ehci) vs usb 3.0 (xhci). See here for more details.

# hostbus and hostport correspond to the numbers from lsusb
# runs in privileged mode to enable access to the usb devices.
docker run \
  --privileged \
  --device /dev/kvm \
  -e RAM=4 \
  -p 50922:10022 \
  -e "DISPLAY=${DISPLAY:-:0.0}" \
  -e EXTRA="-device virtio-serial-pci -device usb-host,hostbus=1,hostport=2" \
  mycustomimage

You should see the device show up when you do system_profiler SPUSBDataType in the MacOS shell.

Important Note: this will cause the host system to lose access to the USB device while the VM is running!

Container creation examples

Quick Start your own image (naked container image)

This is my favourite container. You can supply an existing disk image as a Docker command line argument.

Pull images out using sudo find /var/lib/docker -name mac_hdd_ng.img -size +10G
Supply your own local image with the command argument -v "${PWD}/mac_hdd_ng.img:/image" and use sickcodes/docker-osx:naked when instructing Docker to create your container.
- Naked image is for booting any existing .img file, e.g in the current working directory ($PWD)
- By default, this image has a variable called NOPICKER which is "true". This skips the disk selection menu. Use -e NOPICKER=false or any other string than the word true to enter the boot menu.
  
  This lets you use other disks instead of skipping the boot menu, e.g. recovery disk or disk utility.

docker pull sickcodes/docker-osx:naked

# run your own image + SSH
# change mac_hdd_ng.img
docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v "${PWD}/mac_hdd_ng.img:/image" \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    sickcodes/docker-osx:naked

# run local copy of the auto image + SSH + Boot menu
docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v "${PWD}/mac_hdd_ng_auto.img:/image" \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e "NOPICKER=false" \
    sickcodes/docker-osx:naked

Building an OSX container with video output

The Quick Start command should work out of the box, provided that you keep the following lines. Works in auto & naked machines:

    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \

Prebuilt image with arbitrary command line arguments

-e OSX_COMMANDS lets you run any commands inside the container

docker pull sickcodes/docker-osx:auto

# boot to OS X shell + display + specify commands to run inside OS X!
docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e "OSX_COMMANDS=/bin/bash -c \"put your commands here\"" \
    sickcodes/docker-osx:auto

# Boots in a minute or two!

OR if you have an image already and just want to log in and execute arbitrary commands:

docker pull sickcodes/docker-osx:naked-auto

# boot to OS X shell + display + specify commands to run inside OS X!
docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e USERNAME=yourusername \
    -e PASSWORD=yourpassword \
    -e "OSX_COMMANDS=/bin/bash -c \"put your commands here\"" \
    sickcodes/docker-osx:naked-auto

# Boots in a minute or two!

Further examples

There's a myriad of other potential use cases that can work perfectly with Docker-OSX, some of which you'll see below!

Building a headless OSX container

For a headless container, remove the following two lines from your docker run command:

    # -v /tmp/.X11-unix:/tmp/.X11-unix \
    # -e "DISPLAY=${DISPLAY:-:0.0}" \

Building a headless container from a custom image

This is particularly helpful for CI/CD pipelines.

# run your own image headless + SSH
docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    -v "${PWD}/mac_hdd_ng.img:/image" \
    sickcodes/docker-osx:naked

Building a headless container that allows insecure VNC on localhost (!for local use only!)

Must change -it to -i to be able to interact with the QEMU console

To exit a container using -i you must docker kill <containerid>. For example, to kill everything, docker ps | xargs docker kill.

Native QEMU VNC example

docker run -i \
    --device /dev/kvm \
    -p 50922:10022 \
    -p 5999:5999 \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e EXTRA="-display none -vnc 0.0.0.0:99,password=on" \
    sickcodes/docker-osx:big-sur

# type `change vnc password myvncusername` into the docker terminal and set a password
# connect to localhost:5999 using VNC
# qemu 6 seems to require a username for vnc now

NOT TLS/HTTPS Encrypted at all!

Or ssh -N root@1.1.1.1 -L 5999:127.0.0.1:5999, where 1.1.1.1 is your remote server IP.

(Note: if you close port 5999 and use the SSH tunnel, this becomes secure.)

Building a headless container to run remotely with secure VNC

Add the following line:

-e EXTRA="-display none -vnc 0.0.0.0:99,password=on"

In the Docker terminal, press enter until you see (qemu).

Type change vnc password someusername

Enter a password for your new vnc username^.

You also need the container IP: docker inspect <containerid> | jq -r '.[0].NetworkSettings.IPAddress'

Or ip n will usually show the container IP first.

Now VNC connects using the Docker container IP, for example 172.17.0.2:5999

Remote VNC over SSH: ssh -N root@1.1.1.1 -L 5999:172.17.0.2:5999, where 1.1.1.1 is your remote server IP and 172.17.0.2 is your LAN container IP.

Now you can direct connect VNC to any container built with this command!

I'd like to use SPICE instead of VNC

Optionally, you can enable the SPICE protocol, which allows use of remote-viewer to access your OSX container rather than VNC.

Note: -disable-ticketing will allow unauthenticated access to the VM. See the spice manual for help setting up authenticated access ("Ticketing").

  docker run \
    --device /dev/kvm \
    -p 3001:3001 \
    -p 50922:10022 \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    -e EXTRA="-monitor telnet::45454,server,nowait -nographic -serial null -spice disable-ticketing,port=3001" \
    mycustomimage

Then simply do remote-viewer spice://localhost:3001 and add --spice-debug for debugging.

Creating images based on an already configured and set up container

# You can create an image of an already configured and setup container.
# This allows you to effectively duplicate a system.
# To do this, run the following commands

# make note of your container id
docker ps --all
docker commit containerid newImageName

# To run this image do the following
docker run \
    --device /dev/kvm \
    --device /dev/snd \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    newImageName

docker pull sickcodes/docker-osx:auto

# boot directly into a real OS X shell with no display (Xvfb) [HEADLESS]
docker run -it \
    --device /dev/kvm \
    -p 50922:10022 \
    sickcodes/docker-osx:auto

# username is user
# password is alpine
# Wait 2-3 minutes until you drop into the shell.

Run the original version of Docker-OSX


docker pull sickcodes/docker-osx:latest

docker run -it \
    --device /dev/kvm \
    --device /dev/snd \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    sickcodes/docker-osx:latest

# press CTRL + G if your mouse gets stuck
# scroll down to troubleshooting if you have problems
# need more RAM and SSH on localhost -p 50922?

Run but enable SSH in OS X (Original Version)!

docker run -it \
    --device /dev/kvm \
    --device /dev/snd \
    -p 50922:10022 \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    -e "DISPLAY=${DISPLAY:-:0.0}" \
    sickcodes/docker-osx:latest

# turn on SSH after you've installed OS X in the "Sharing" settings.
ssh user@localhost -p 50922

Autoboot into OS X after you've installed everything

Add the extra option -e NOPICKER=true.

Old machines:

# find your containerID
docker ps

# move the no picker script on top of the Launch script
# NEW CONTAINERS
docker exec containerID mv ./Launch-nopicker.sh ./Launch.sh

# VNC-VERSION-CONTAINER
docker exec containerID mv ./Launch-nopicker.sh ./Launch_custom.sh

# LEGACY CONTAINERS
docker exec containerID bash -c "grep -v InstallMedia ./Launch.sh > ./Launch-nopicker.sh
chmod +x ./Launch-nopicker.sh
sed -i -e s/OpenCore\.qcow2/OpenCore\-nopicker\.qcow2/ ./Launch-nopicker.sh
"

The big-sur image starts slowly after installation. Is this expected?

Automatic updates are still on in the container's settings. You may wish to turn them off. We have future plans for development around this.

What is `${DISPLAY:-:0.0}`?

$DISPLAY is the shell variable that refers to your X11 display server.

${DISPLAY} is the same, but allows you to join variables like this:

e.g. ${DISPLAY}_${DISPLAY} would print :0.0_:0.0
e.g. $DISPLAY_$DISPLAY would print :0.0

...because $DISPLAY_ is not $DISPLAY

${variable:-fallback} allows you to set a "fallback" variable to be substituted if $variable is not set.

You can also use ${variable:=fallback} to set that variable (in your current terminal).

In Docker-OSX, we assume, :0.0 is your default $DISPLAY variable.

You can see what yours is

echo $DISPLAY

That way, ${DISPLAY:-:0.0} will use whatever variable your X11 server has set for you, else :0.0

What is `-v /tmp/.X11-unix:/tmp/.X11-unix`?

-v is a Docker command-line option that lets you pass a volume to the container.

The directory that we are letting the Docker container use is a X server display socket.

/tmp/.X11-unix

If we let the Docker container use the same display socket as our own environment, then any applications you run inside the Docker container will show up on your screen too! https://www.x.org/archive/X11R6.8.0/doc/RELNOTES5.html

ALSA errors on startup or container creation

You may when initialising or booting into a container see errors from the (qemu) console of the following form: ALSA lib blahblahblah: (function name) returned error: no such file or directory. These are more or less expected. As long as you are able to boot into the container and everything is working, no reason to worry about these.