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nixpkgs/nixos/modules/virtualisation/container-config.nix

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Always enable container logins
2014-04-01 14:42:18 +01:00
{ config, pkgs, lib, ... }:
with lib;
Provide a simple way to log into containers On the host, you can run $ socat unix:<path-to-container>/var/lib/login.socket -,echo=0,raw to get a login prompt. So this allows logging in even if the container has no SSH access enabled. You can also do $ socat unix:<path-to-container>/var/lib/root-shell.socket - to get a plain root shell. (This socket is only accessible by root, obviously.) This makes it easy to execute commands in the container, e.g. $ echo reboot | socat unix:<path-to-container>/var/lib/root-shell.socket -
2014-03-17 13:04:39 +00:00
{
Always enable container logins
2014-04-01 14:42:18 +01:00
config = mkIf config.boot.isContainer {
Provide a simple way to log into containers On the host, you can run $ socat unix:<path-to-container>/var/lib/login.socket -,echo=0,raw to get a login prompt. So this allows logging in even if the container has no SSH access enabled. You can also do $ socat unix:<path-to-container>/var/lib/root-shell.socket - to get a plain root shell. (This socket is only accessible by root, obviously.) This makes it easy to execute commands in the container, e.g. $ echo reboot | socat unix:<path-to-container>/var/lib/root-shell.socket -
2014-03-17 13:04:39 +00:00
Enable udisks2 by default The ability for unprivileged users to mount external media is useful regardless of the desktop environment. Also, since udisks2 is activated on-demand, it doesn't add any overhead if you're not using it.
2014-04-19 13:41:21 +01:00
# Disable some features that are not useful in a container.
Drop ALSA dependency in containers
2014-04-16 00:44:43 +01:00
sound.enable = mkDefault false;
Enable udisks2 by default The ability for unprivileged users to mount external media is useful regardless of the desktop environment. Also, since udisks2 is activated on-demand, it doesn't add any overhead if you're not using it.
2014-04-19 13:41:21 +01:00
services.udisks2.enable = mkDefault false;
Drop ALSA dependency in containers
2014-04-16 00:44:43 +01:00
Containers: Use /etc/resolv.conf supplied by the host This used to work with systemd-nspawn 203, because it bind-mounted /etc/resolv.conf (so openresolv couldn't overwrite it). Now it's just copied, so we need some special handling.
2014-04-18 15:40:27 +01:00
networking.useHostResolvConf = true;
sshd: Add support for socket activation By enabling ‘services.openssh.startWhenNeeded’, sshd is started on-demand by systemd using socket activation. This is particularly useful if you have a zillion containers and don't want to have sshd running permanently. Note that socket activation is not noticeable slower, contrary to what the manpage for ‘sshd -i’ says, so we might want to make this the default one day.
2014-04-22 15:07:53 +01:00
# Containers should be light-weight, so start sshd on demand.
services.openssh.startWhenNeeded = mkDefault true;
Containers: Don't warn about not having a boot loader
2014-04-18 16:00:11 +01:00
# Shut up warnings about not having a boot loader.
system.build.installBootLoader = "${pkgs.coreutils}/bin/true";
Containers: Don't remount /
2014-08-12 01:51:20 +01:00
systemd.services.systemd-remount-fs.enable = false;
Provide a simple way to log into containers On the host, you can run $ socat unix:<path-to-container>/var/lib/login.socket -,echo=0,raw to get a login prompt. So this allows logging in even if the container has no SSH access enabled. You can also do $ socat unix:<path-to-container>/var/lib/root-shell.socket - to get a plain root shell. (This socket is only accessible by root, obviously.) This makes it easy to execute commands in the container, e.g. $ echo reboot | socat unix:<path-to-container>/var/lib/root-shell.socket -
2014-03-17 13:04:39 +00:00
};
}
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