Nix application VMs: security through virtualization

Simple application VMs (hypervisor-based sandbox) based on Nix package manager.

Uses one read-only /nix directory for all appvms. So creating a new appvm (but not first) is just about one minute.

Installation

Requirements

$ sudo apt install virt-manager curl git
$ sudo usermod -a -G libvirt $USER # group can also be "libvirtd"
$ newgrp libvirt
$ echo user = "\"$USER\"" | sudo tee -a /etc/libvirt/qemu.conf
$ sudo systemctl restart libvirtd

Install Nix package manager

$ sudo mkdir -m 0755 /nix && sudo chown $USER /nix
$ curl https://nixos.org/nix/install | sh
$ nix-channel --add https://nixos.org/channels/nixos-19.09 nixpkgs
$ . ~/.nix-profile/etc/profile.d/nix.sh

Install appvm

$ nix-env -if https://code.dumpstack.io/tools/appvm/archive/master.tar.gz

Usage

Search for applications

$ appvm search chromium

Run application

$ appvm start chromium
$ # ... long wait for first time, because we need to collect a lot of packages

Synchronize remote repos for applications

$ appvm sync

You can customize local settings in ~/.config/appvm/nix/local.nix.

Default hotkey to release cursor: ctrl+alt.

Shared directory

$ ls appvm/chromium
foo.tar.gz
bar.tar.gz

Close VM

$ appvm stop chromium

Automatic ballooning

Add this command:

$ appvm autoballoon

to crontab like that:

$ crontab -l
* * * * * /home/user/dev/go/bin/appvm autoballoon

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