307064ceb5
If the host is shutting down, machinectl may fail because it's bus-activated and D-Bus will be shutting down. So just send a signal to the leader process directly. Fixes #6212.
377 lines
12 KiB
Nix
377 lines
12 KiB
Nix
{ config, lib, pkgs, ... }:
|
|
|
|
with lib;
|
|
|
|
let
|
|
|
|
nixos-container = pkgs.substituteAll {
|
|
name = "nixos-container";
|
|
dir = "bin";
|
|
isExecutable = true;
|
|
src = ./nixos-container.pl;
|
|
perl = "${pkgs.perl}/bin/perl -I${pkgs.perlPackages.FileSlurp}/lib/perl5/site_perl";
|
|
su = "${pkgs.shadow.su}/bin/su";
|
|
inherit (pkgs) utillinux;
|
|
};
|
|
|
|
# The container's init script, a small wrapper around the regular
|
|
# NixOS stage-2 init script.
|
|
containerInit = pkgs.writeScript "container-init"
|
|
''
|
|
#! ${pkgs.stdenv.shell} -e
|
|
|
|
# Initialise the container side of the veth pair.
|
|
if [ "$PRIVATE_NETWORK" = 1 ]; then
|
|
ip link set host0 name eth0
|
|
ip link set dev eth0 up
|
|
if [ -n "$HOST_ADDRESS" ]; then
|
|
ip route add $HOST_ADDRESS dev eth0
|
|
ip route add default via $HOST_ADDRESS
|
|
fi
|
|
if [ -n "$LOCAL_ADDRESS" ]; then
|
|
ip addr add $LOCAL_ADDRESS dev eth0
|
|
fi
|
|
fi
|
|
|
|
# Start the regular stage 1 script, passing the bind-mounted
|
|
# notification socket from the host to allow the container
|
|
# systemd to signal readiness to the host systemd.
|
|
NOTIFY_SOCKET=/var/lib/private/host-notify exec "$1"
|
|
'';
|
|
|
|
system = config.nixpkgs.system;
|
|
|
|
in
|
|
|
|
{
|
|
options = {
|
|
|
|
boot.isContainer = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = ''
|
|
Whether this NixOS machine is a lightweight container running
|
|
in another NixOS system.
|
|
'';
|
|
};
|
|
|
|
boot.enableContainers = mkOption {
|
|
type = types.bool;
|
|
default = !config.boot.isContainer;
|
|
description = ''
|
|
Whether to enable support for nixos containers.
|
|
'';
|
|
};
|
|
|
|
containers = mkOption {
|
|
type = types.attrsOf (types.submodule (
|
|
{ config, options, name, ... }:
|
|
{
|
|
options = {
|
|
|
|
config = mkOption {
|
|
description = ''
|
|
A specification of the desired configuration of this
|
|
container, as a NixOS module.
|
|
'';
|
|
};
|
|
|
|
path = mkOption {
|
|
type = types.path;
|
|
example = "/nix/var/nix/profiles/containers/webserver";
|
|
description = ''
|
|
As an alternative to specifying
|
|
<option>config</option>, you can specify the path to
|
|
the evaluated NixOS system configuration, typically a
|
|
symlink to a system profile.
|
|
'';
|
|
};
|
|
|
|
privateNetwork = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = ''
|
|
Whether to give the container its own private virtual
|
|
Ethernet interface. The interface is called
|
|
<literal>eth0</literal>, and is hooked up to the interface
|
|
<literal>ve-<replaceable>container-name</replaceable></literal>
|
|
on the host. If this option is not set, then the
|
|
container shares the network interfaces of the host,
|
|
and can bind to any port on any interface.
|
|
'';
|
|
};
|
|
|
|
hostAddress = mkOption {
|
|
type = types.nullOr types.string;
|
|
default = null;
|
|
example = "10.231.136.1";
|
|
description = ''
|
|
The IPv4 address assigned to the host interface.
|
|
'';
|
|
};
|
|
|
|
localAddress = mkOption {
|
|
type = types.nullOr types.string;
|
|
default = null;
|
|
example = "10.231.136.2";
|
|
description = ''
|
|
The IPv4 address assigned to <literal>eth0</literal>
|
|
in the container.
|
|
'';
|
|
};
|
|
|
|
autoStart = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = ''
|
|
Wether the container is automatically started at boot-time.
|
|
'';
|
|
};
|
|
};
|
|
|
|
config = mkMerge
|
|
[ (mkIf options.config.isDefined {
|
|
path = (import ../../lib/eval-config.nix {
|
|
inherit system;
|
|
modules =
|
|
let extraConfig =
|
|
{ boot.isContainer = true;
|
|
networking.hostName = mkDefault name;
|
|
networking.useDHCP = false;
|
|
};
|
|
in [ extraConfig config.config ];
|
|
prefix = [ "containers" name ];
|
|
}).config.system.build.toplevel;
|
|
})
|
|
];
|
|
}));
|
|
|
|
default = {};
|
|
example = literalExample
|
|
''
|
|
{ webserver =
|
|
{ path = "/nix/var/nix/profiles/webserver";
|
|
};
|
|
database =
|
|
{ config =
|
|
{ config, pkgs, ... }:
|
|
{ services.postgresql.enable = true;
|
|
services.postgresql.package = pkgs.postgresql92;
|
|
};
|
|
};
|
|
}
|
|
'';
|
|
description = ''
|
|
A set of NixOS system configurations to be run as lightweight
|
|
containers. Each container appears as a service
|
|
<literal>container-<replaceable>name</replaceable></literal>
|
|
on the host system, allowing it to be started and stopped via
|
|
<command>systemctl</command> .
|
|
'';
|
|
};
|
|
|
|
};
|
|
|
|
|
|
config = mkIf (config.boot.enableContainers) {
|
|
|
|
systemd.services."container@" =
|
|
{ description = "Container '%i'";
|
|
|
|
unitConfig.RequiresMountsFor = [ "/var/lib/containers/%i" ];
|
|
|
|
path = [ pkgs.iproute ];
|
|
|
|
environment.INSTANCE = "%i";
|
|
environment.root = "/var/lib/containers/%i";
|
|
|
|
preStart =
|
|
''
|
|
# Clean up existing machined registration and interfaces.
|
|
machinectl terminate "$INSTANCE" 2> /dev/null || true
|
|
|
|
if [ "$PRIVATE_NETWORK" = 1 ]; then
|
|
ip link del dev "ve-$INSTANCE" 2> /dev/null || true
|
|
fi
|
|
|
|
|
|
if [ "$PRIVATE_NETWORK" = 1 ]; then
|
|
ip link del dev "ve-$INSTANCE" 2> /dev/null || true
|
|
fi
|
|
'';
|
|
|
|
script =
|
|
''
|
|
mkdir -p -m 0755 "$root/etc" "$root/var/lib"
|
|
mkdir -p -m 0700 "$root/var/lib/private" "$root/root" /run/containers
|
|
if ! [ -e "$root/etc/os-release" ]; then
|
|
touch "$root/etc/os-release"
|
|
fi
|
|
|
|
mkdir -p -m 0755 \
|
|
"/nix/var/nix/profiles/per-container/$INSTANCE" \
|
|
"/nix/var/nix/gcroots/per-container/$INSTANCE"
|
|
|
|
cp --remove-destination /etc/resolv.conf "$root/etc/resolv.conf"
|
|
|
|
if [ "$PRIVATE_NETWORK" = 1 ]; then
|
|
extraFlags+=" --network-veth"
|
|
fi
|
|
|
|
for iface in $MACVLANS; do
|
|
extraFlags+=" --network-macvlan=$iface"
|
|
done
|
|
|
|
# If the host is 64-bit and the container is 32-bit, add a
|
|
# --personality flag.
|
|
${optionalString (config.nixpkgs.system == "x86_64-linux") ''
|
|
if [ "$(< ''${SYSTEM_PATH:-/nix/var/nix/profiles/per-container/$INSTANCE/system}/system)" = i686-linux ]; then
|
|
extraFlags+=" --personality=x86"
|
|
fi
|
|
''}
|
|
|
|
# Run systemd-nspawn without startup notification (we'll
|
|
# wait for the container systemd to signal readiness).
|
|
EXIT_ON_REBOOT=1 NOTIFY_SOCKET= \
|
|
exec ${config.systemd.package}/bin/systemd-nspawn \
|
|
--keep-unit \
|
|
-M "$INSTANCE" -D "$root" $extraFlags \
|
|
--bind-ro=/nix/store \
|
|
--bind-ro=/nix/var/nix/db \
|
|
--bind-ro=/nix/var/nix/daemon-socket \
|
|
--bind=/run/systemd/notify:/var/lib/private/host-notify \
|
|
--bind="/nix/var/nix/profiles/per-container/$INSTANCE:/nix/var/nix/profiles" \
|
|
--bind="/nix/var/nix/gcroots/per-container/$INSTANCE:/nix/var/nix/gcroots" \
|
|
--setenv PRIVATE_NETWORK="$PRIVATE_NETWORK" \
|
|
--setenv HOST_ADDRESS="$HOST_ADDRESS" \
|
|
--setenv LOCAL_ADDRESS="$LOCAL_ADDRESS" \
|
|
--setenv PATH="$PATH" \
|
|
${containerInit} "''${SYSTEM_PATH:-/nix/var/nix/profiles/system}/init"
|
|
'';
|
|
|
|
postStart =
|
|
''
|
|
if [ "$PRIVATE_NETWORK" = 1 ]; then
|
|
ifaceHost=ve-$INSTANCE
|
|
ip link set dev $ifaceHost up
|
|
if [ -n "$HOST_ADDRESS" ]; then
|
|
ip addr add $HOST_ADDRESS dev $ifaceHost
|
|
fi
|
|
if [ -n "$LOCAL_ADDRESS" ]; then
|
|
ip route add $LOCAL_ADDRESS dev $ifaceHost
|
|
fi
|
|
fi
|
|
|
|
# Get the leader PID so that we can signal it in
|
|
# preStop. We can't use machinectl there because D-Bus
|
|
# might be shutting down. FIXME: in systemd 219 we can
|
|
# just signal systemd-nspawn to do a clean shutdown.
|
|
machinectl show "$INSTANCE" | sed 's/Leader=\(.*\)/\1/;t;d' > "/run/containers/$INSTANCE.pid"
|
|
'';
|
|
|
|
preStop =
|
|
''
|
|
pid="$(cat /run/containers/$INSTANCE.pid)"
|
|
if [ -n "$pid" ]; then
|
|
kill -RTMIN+4 "$pid"
|
|
fi
|
|
rm -f "/run/containers/$INSTANCE.pid"
|
|
'';
|
|
|
|
restartIfChanged = false;
|
|
#reloadIfChanged = true; # FIXME
|
|
|
|
serviceConfig = {
|
|
ExecReload = pkgs.writeScript "reload-container"
|
|
''
|
|
#! ${pkgs.stdenv.shell} -e
|
|
${nixos-container}/bin/nixos-container run "$INSTANCE" -- \
|
|
bash --login -c "/nix/var/nix/profiles/system/bin/switch-to-configuration test"
|
|
'';
|
|
|
|
SyslogIdentifier = "container %i";
|
|
|
|
EnvironmentFile = "-/etc/containers/%i.conf";
|
|
|
|
Type = "notify";
|
|
|
|
NotifyAccess = "all";
|
|
|
|
# Note that on reboot, systemd-nspawn returns 133, so this
|
|
# unit will be restarted. On poweroff, it returns 0, so the
|
|
# unit won't be restarted.
|
|
RestartForceExitStatus = "133";
|
|
SuccessExitStatus = "133";
|
|
|
|
Restart = "on-failure";
|
|
|
|
# Hack: we don't want to kill systemd-nspawn, since we call
|
|
# "machinectl poweroff" in preStop to shut down the
|
|
# container cleanly. But systemd requires sending a signal
|
|
# (at least if we want remaining processes to be killed
|
|
# after the timeout). So send an ignored signal.
|
|
KillMode = "mixed";
|
|
KillSignal = "WINCH";
|
|
};
|
|
};
|
|
|
|
# Generate a configuration file in /etc/containers for each
|
|
# container so that container@.target can get the container
|
|
# configuration.
|
|
environment.etc = mapAttrs' (name: cfg: nameValuePair "containers/${name}.conf"
|
|
{ text =
|
|
''
|
|
SYSTEM_PATH=${cfg.path}
|
|
${optionalString cfg.privateNetwork ''
|
|
PRIVATE_NETWORK=1
|
|
${optionalString (cfg.hostAddress != null) ''
|
|
HOST_ADDRESS=${cfg.hostAddress}
|
|
''}
|
|
${optionalString (cfg.localAddress != null) ''
|
|
LOCAL_ADDRESS=${cfg.localAddress}
|
|
''}
|
|
''}
|
|
${optionalString cfg.autoStart ''
|
|
AUTO_START=1
|
|
''}
|
|
'';
|
|
}) config.containers;
|
|
|
|
# Generate /etc/hosts entries for the containers.
|
|
networking.extraHosts = concatStrings (mapAttrsToList (name: cfg: optionalString (cfg.localAddress != null)
|
|
''
|
|
${cfg.localAddress} ${name}.containers
|
|
'') config.containers);
|
|
|
|
networking.dhcpcd.denyInterfaces = [ "ve-*" ];
|
|
|
|
environment.systemPackages = [ nixos-container ];
|
|
|
|
# Start containers at boot time.
|
|
systemd.services.all-containers =
|
|
{ description = "All Containers";
|
|
|
|
wantedBy = [ "multi-user.target" ];
|
|
|
|
unitConfig.ConditionDirectoryNotEmpty = "/etc/containers";
|
|
|
|
serviceConfig.Type = "oneshot";
|
|
|
|
script =
|
|
''
|
|
res=0
|
|
shopt -s nullglob
|
|
for i in /etc/containers/*.conf; do
|
|
AUTO_START=
|
|
source "$i"
|
|
if [ "$AUTO_START" = 1 ]; then
|
|
systemctl start "container@$(basename "$i" .conf).service" || res=1
|
|
fi
|
|
done
|
|
exit $res
|
|
''; # */
|
|
};
|
|
|
|
};
|
|
}
|