lima-vm / lima

Linux virtual machines, typically on macOS, for running containerd

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[πŸ“–Getting started] [❓FAQs & Troubleshooting]

Lima logo

Lima: Linux virtual machines (on macOS, in most cases)

Lima launches Linux virtual machines with automatic file sharing and port forwarding (similar to WSL2), and containerd.

Lima can be considered as a some sort of unofficial "containerd for Mac".

Lima is expected to be used on macOS hosts, but can be used on Linux hosts as well.

βœ… Automatic file sharing

βœ… Automatic port forwarding

βœ… Built-in support for containerd (Other container engines can be used too)

βœ… Intel on Intel

βœ… ARM on Intel

βœ… ARM on ARM

βœ… Intel on ARM

βœ… Various guest Linux distributions: AlmaLinux, Alpine, Arch Linux, Debian, Fedora, openSUSE, Oracle Linux, Rocky, Ubuntu (default), ...

Related project: sshocker (ssh with file sharing and port forwarding)

This project is unrelated to The Lima driver project (driver for ARM Mali GPUs).

Motivation

The goal of Lima is to promote containerd including nerdctl (contaiNERD ctl) to Mac users, but Lima can be used for non-container applications as well.

Community

Adopters

Container environments:

  • Rancher Desktop: Kubernetes and container management to the desktop
  • Colima: Docker (and Kubernetes) on macOS with minimal setup

GUI:

Communication channels

Examples

uname

$ uname -a
Darwin macbook.local 20.4.0 Darwin Kernel Version 20.4.0: Thu Apr 22 21:46:47 PDT 2021; root:xnu-7195.101.2~1/RELEASE_X86_64 x86_64

$ lima uname -a
Linux lima-default 5.11.0-16-generic #17-Ubuntu SMP Wed Apr 14 20:12:43 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

$ LIMA_INSTANCE=arm lima uname -a
Linux lima-arm 5.11.0-16-generic #17-Ubuntu SMP Wed Apr 14 20:10:16 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux

See ./docs/multi-arch.md for Intel-on-ARM and ARM-on-Intel .

Sharing files across macOS and Linux

$ echo "files under /Users on macOS filesystem are readable from Linux" > some-file

$ lima cat some-file
files under /Users on macOS filesystem are readable from Linux

$ lima sh -c 'echo "/tmp/lima is writable from both macOS and Linux" > /tmp/lima/another-file'

$ cat /tmp/lima/another-file
/tmp/lima is writable from both macOS and Linux

Running containerd containers (compatible with Docker containers)

$ lima nerdctl run -d --name nginx -p 127.0.0.1:8080:80 nginx:alpine

You don't need to run "lima nerdctl" everytime, instead you can use special shortcut called "nerdctl.lima" to do the same thing. By default, it'll be installed along with the lima, so, you don't need to do anything extra. There will be a symlink called nerdctl pointing to nerdctl.lima. This is only created when there is no nerdctl entry in the directory already though. It worths to mention that this is created only via make install. Not included in Homebrew/MacPorts/nix packages.

http://127.0.0.1:8080 is accessible from both macOS and Linux.

For the usage of containerd and nerdctl (contaiNERD ctl), visit https://github.com/containerd/containerd and https://github.com/containerd/nerdctl.

Getting started

Installation

Homebrew package is available.

brew install lima
Manual installation steps

Install QEMU

Install recent version of QEMU.

On M1 macOS, Homebrew's QEMU 6.2.0_1 or later is recommended.

If you are not using Homebrew, make sure to include the following commits to boot recent Linux guests:

These commits are also included in the QEMU 7.0, however, it should be noted that QEMU 7.0 needs macOS 12.4 or later to use more than 3 GiB memory on M1.

Install Lima

brew install jq
VERSION=$(curl -fsSL https://api.github.com/repos/lima-vm/lima/releases/latest | jq -r .tag_name)
curl -fsSL "https://github.com/lima-vm/lima/releases/download/${VERSION}/lima-${VERSION:1}-$(uname -s)-$(uname -m).tar.gz" | tar Cxzvm /usr/local
  • To install Lima from the source, run make && make install.

NOTE Lima is not regularly tested on ARM Mac (due to lack of CI).

Usage

[macOS]$ limactl start
...
INFO[0029] READY. Run `lima` to open the shell.

[macOS]$ lima uname
Linux

Command reference

limactl start

limactl start [--name=NAME] [--tty=false] <template://TEMPLATE>: start the Linux instance

$ limactl start
? Creating an instance "default"  [Use arrows to move, type to filter]
> Proceed with the current configuration
  Open an editor to review or modify the current configuration
  Choose another example (docker, podman, archlinux, fedora, ...)
  Exit
...
INFO[0029] READY. Run `lima` to open the shell.

Choose Proceed with the current configuration, and wait until "READY" to be printed on the host terminal. For automation, --tty=false flag can be used for disabling the interactive user interface.

Advanced usage

To create an instance "default" from a template "docker":

$ limactl start --name=default template://docker

NOTE: limactl start template://TEMPLATE requires Lima v0.9.0 or later. Older releases require limactl start /usr/local/share/doc/lima/examples/TEMPLATE.yaml instead.

To see the template list:

$ limactl start --list-templates

To create an instance "default" from a local file:

$ limactl start --name=default /usr/local/share/lima/examples/fedora.yaml

To create an instance "default" from a remote URL (use carefully, with a trustable source):

$ limactl start --name=default https://raw.githubusercontent.com/lima-vm/lima/master/examples/alpine.yaml

limactl shell

limactl shell <INSTANCE> <COMMAND>: launch <COMMAND> on Linux.

For the "default" instance, this command can be shortened as lima <COMMAND>. The lima command also accepts the instance name as the environment variable $LIMA_INSTANCE.

limactl copy

limactl copy <SOURCE> ... <TARGET>: copy files between instances, or between instances and the host

Use <INSTANCE>:<FILENAME> to specify a source or target inside an instance.

limactl list

limactl list [--json]: show the instances

limactl stop

limactl stop [--force] <INSTANCE>: stop the instance

limactl delete

limactl delete [--force] <INSTANCE>: delete the instance

limactl factory-reset

limactl factory-reset <INSTANCE>: factory reset the instance

limactl edit

limactl edit <INSTANCE>: edit the instance

limactl completion

  • To enable bash completion, add source <(limactl completion bash) to ~/.bash_profile.

  • To enable zsh completion, see limactl completion zsh --help

⚠️ CAUTION: make sure to back up your data

Lima may have bugs that result in loss of data.

Make sure to back up your data before running Lima.

Especially, the following data might be easily lost:

  • Data in the shared writable directories (/tmp/lima by default), probably after hibernation of the host machine (e.g., after closing and reopening the laptop lid)
  • Data in the VM image, mostly when upgrading the version of lima

Configuration

See ./examples/default.yaml.

The current default spec:

  • OS: Ubuntu 22.04 (Jammy Jellyfish)
  • CPU: 4 cores
  • Memory: 4 GiB
  • Disk: 100 GiB
  • Mounts: ~ (read-only), /tmp/lima (writable)
  • SSH: 127.0.0.1:60022

How it works

Developer guide

Contributing to Lima

Help wanted

πŸ™

  • Performance optimization
  • More guest distros
  • Windows hosts
  • virtio-fs to replace virtio-9p-pci aka virtfs (work has to be done on QEMU repo)
  • vsock to replace SSH (work has to be done on QEMU repo)

FAQs & Troubleshooting

Generic

Generic

"What's my login password?"

Password is disabled and locked by default. You have to use limactl shell bash (or lima bash) to open a shell.

Alternatively, you may also directly ssh into the guest: ssh -p 60022 -i ~/.lima/_config/user -o NoHostAuthenticationForLocalhost=yes 127.0.0.1.

"Does Lima work on ARM Mac?"

Yes, it should work, but not regularly tested on ARM (due to lack of CI).

"Can I run non-Ubuntu guests?"

AlmaLinux, Alpine, Arch Linux, Debian, Fedora, openSUSE, Oracle Linux, and Rocky are also known to work. See ./examples/.

An image has to satisfy the following requirements:

  • systemd or OpenRC
  • cloud-init
  • The following binaries to be preinstalled:
    • sudo
  • The following binaries to be preinstalled, or installable via the package manager:
    • sshfs
    • newuidmap and newgidmap
  • apt-get, dnf, apk, pacman, or zypper (if you want to contribute support for another package manager, run git grep apt-get to find out where to modify)

"Can I run other container engines such as Docker and Podman? What about Kubernetes?"

Yes, any container engine should work with Lima.

Container runtime examples:

Container image builder examples:

Container orchestrator examples:

The default Ubuntu image also contains LXD. Runlima sudo lxc init to set up LXD.

See also third party containerd projects based on Lima:

  • Rancher Desktop: Kubernetes and container management to the desktop
  • Colima: Docker (and Kubernetes) on macOS with minimal setup

"Can I run Lima with a remote Linux machine?"

Lima itself does not support connecting to a remote Linux machine, but sshocker, the predecessor or Lima, provides similar features for remote Linux machines.

e.g., run sshocker -v /Users/foo:/home/foo/mnt -p 8080:80 <USER>@<HOST> to expose /Users/foo to the remote machine as /home/foo/mnt, and forward localhost:8080 to the port 80 of the remote machine.

"Advantages compared to Docker for Mac?"

Lima is free software (Apache License 2.0), while Docker for Mac is not. Their EULA even prohibits disclosure of benchmarking result.

On the other hand, Moby, aka Docker for Linux, is free software, but Moby/Docker lacks several novel features of containerd, such as:

QEMU

"QEMU crashes with HV_ERROR"

If you have installed QEMU v6.0.0 or later on macOS 11 via homebrew, your QEMU binary should have been already automatically signed to enable HVF acceleration.

However, if you see HV_ERROR, you might need to sign the binary manually.

cat >entitlements.xml <<EOF
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>com.apple.security.hypervisor</key>
    <true/>
</dict>
</plist>
EOF

codesign -s - --entitlements entitlements.xml --force /usr/local/bin/qemu-system-x86_64

Note: Only on macOS versions before 10.15.7 you might need to add this entitlement in addition:

    <key>com.apple.vm.hypervisor</key>
    <true/>

"QEMU is slow"

  • Make sure that HVF is enabled with com.apple.security.hypervisor entitlement. See "QEMU crashes with HV_ERROR".
  • Emulating non-native machines (ARM-on-Intel, Intel-on-ARM) is slow by design. See docs/multi-arch.md for a workaround.

error "killed -9"

  • make sure qemu is codesigned, See "QEMU crashes with HV_ERROR".
  • if you are on macOS 10.15.7 or 11.0 or later make sure the entitlement com.apple.vm.hypervisor is not added. It only works on older macOS versions. You can clear the codesigning with codesign --remove-signature /usr/local/bin/qemu-system-x86_64 and start over.

"QEMU crashes with vmx_write_mem: mmu_gva_to_gpa XXXXXXXXXXXXXXXX failed"

This error is known to happen when running an image of RHEL8-compatible distribution such as Rocky Linux 8.x on Intel Mac. A workaround is to set environment variable QEMU_SYSTEM_X86_64="qemu-system-x86_64 -cpu Haswell-v4".

https://bugs.launchpad.net/qemu/+bug/1838390

SSH

"Port forwarding does not work"

Prior to Lima v0.7.0, Lima did not support forwarding privileged ports (1-1023). e.g., you had to use 8080, not 80.

Lima v0.7.0 and later supports forwarding privileged ports on macOS hosts.

On Linux hosts, you might have to set sysctl value net.ipv4.ip_unprivileged_port_start=0.

stuck on "Waiting for the essential requirement 1 of X: "ssh"

On M1 macOS, QEMU needs to be Homebrew's QEMU 6.2.0_1 or later to run recent Linux guests. Run brew upgrade to upgrade QEMU.

If you are not using Homebrew, see the "Manual installation steps" in the Installation section.

See also serial.log in ~/.lima/<INSTANCE> for debugging.

"permission denied" for limactl cp command

The copy command only works for instances that have been created by lima 0.5.0 or later. You can manually install the required identity on older instances with (replace INSTANCE with actual instance name):

< ~/.lima/_config/user.pub limactl shell INSTANCE sh -c 'tee -a ~/.ssh/authorized_keys'

Networking

"Cannot access the guest IP 192.168.5.15 from the host"

The default guest IP 192.168.5.15 is not accessible from the host and other guests.

To add another IP address that is accessible from the host and other virtual machines, enable vde_vmnet.

See ./docs/network.md.

Ping shows duplicate packets and massive response times

Lima uses QEMU's SLIRP networking which does not support ping out of the box:

$ ping google.com
PING google.com (172.217.165.14): 56 data bytes
64 bytes from 172.217.165.14: seq=0 ttl=42 time=2395159.646 ms
64 bytes from 172.217.165.14: seq=0 ttl=42 time=2396160.798 ms (DUP!)

For more details, see Documentation/Networking.

External projects

"I am using Rancher Desktop. How to deal with the underlying Lima?"

On macOS hosts, Rancher Desktop (as of v1.0) launches Lima with the following configuration:

  • $LIMA_HOME directory: $HOME/Library/Application Support/rancher-desktop/lima
  • limactl binary: /Applications/Rancher Desktop.app/Contents/Resources/resources/darwin/lima/bin/limactl
  • Lima instance name: 0

To open a shell, run the following command:

LIMA_HOME="$HOME/Library/Application Support/rancher-desktop/lima" "/Applications/Rancher Desktop.app/Contents/Resources/resources/darwin/lima/bin/limactl" shell 0

On Linux hosts, try the following command:

LIMA_HOME="$HOME/.local/share/rancher-desktop/lima" /opt/rancher-desktop/resources/resources/linux/lima/bin/limactl shell 0

If you have installed Rancher Desktop as an AppImage:

LIMA_HOME="$HOME/.local/share/rancher-desktop/lima" "$(ls -d /tmp/.mount_ranche*/opt/rancher-desktop/resources/resources/linux/lima/bin)/limactl" shell 0

"Hints for debugging other problems?"

  • Inspect logs:
    • limactl --debug start
    • $HOME/.lima/<INSTANCE>/serial.log
    • /var/log/cloud-init-output.log (inside the guest)
    • /var/log/cloud-init.log (inside the guest)
  • Make sure that you aren't mixing up tabs and spaces in the YAML.
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Linux virtual machines, typically on macOS, for running containerd

License:Apache License 2.0


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