96190535e5
This reverts commit 095fe5b43def40279a243e663c662b02caac5318. Pointless renames considered harmful. All they do is force people to spend extra work updating their configs for no benefit, and hindering the ability to switch between unstable and stable versions of NixOS. Like, what was the value of having the "nixos." there? I mean, by definition anything in a NixOS module has something to do with NixOS...
749 lines
24 KiB
Nix
749 lines
24 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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# The container's init script, a small wrapper around the regular
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# NixOS stage-2 init script.
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containerInit = (cfg:
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let
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renderExtraVeth = (name: cfg:
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''
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echo "Bringing ${name} up"
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ip link set dev ${name} up
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${optionalString (cfg.localAddress != null) ''
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echo "Setting ip for ${name}"
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ip addr add ${cfg.localAddress} dev ${name}
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''}
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${optionalString (cfg.localAddress6 != null) ''
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echo "Setting ip6 for ${name}"
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ip -6 addr add ${cfg.localAddress6} dev ${name}
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''}
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${optionalString (cfg.hostAddress != null) ''
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echo "Setting route to host for ${name}"
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ip route add ${cfg.hostAddress} dev ${name}
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''}
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${optionalString (cfg.hostAddress6 != null) ''
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echo "Setting route6 to host for ${name}"
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ip -6 route add ${cfg.hostAddress6} dev ${name}
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''}
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''
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);
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in
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pkgs.writeScript "container-init"
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''
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#! ${pkgs.runtimeShell} -e
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# Initialise the container side of the veth pair.
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if [ "$PRIVATE_NETWORK" = 1 ]; then
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ip link set host0 name eth0
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ip link set dev eth0 up
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if [ -n "$LOCAL_ADDRESS" ]; then
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ip addr add $LOCAL_ADDRESS dev eth0
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fi
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if [ -n "$LOCAL_ADDRESS6" ]; then
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ip -6 addr add $LOCAL_ADDRESS6 dev eth0
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fi
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if [ -n "$HOST_ADDRESS" ]; then
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ip route add $HOST_ADDRESS dev eth0
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ip route add default via $HOST_ADDRESS
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fi
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if [ -n "$HOST_ADDRESS6" ]; then
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ip -6 route add $HOST_ADDRESS6 dev eth0
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ip -6 route add default via $HOST_ADDRESS6
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fi
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${concatStringsSep "\n" (mapAttrsToList renderExtraVeth cfg.extraVeths)}
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fi
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# Start the regular stage 1 script.
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exec "$1"
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''
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);
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nspawnExtraVethArgs = (name: cfg: "--network-veth-extra=${name}");
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startScript = cfg:
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''
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mkdir -p -m 0755 "$root/etc" "$root/var/lib"
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mkdir -p -m 0700 "$root/var/lib/private" "$root/root" /run/containers
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if ! [ -e "$root/etc/os-release" ]; then
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touch "$root/etc/os-release"
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fi
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if ! [ -e "$root/etc/machine-id" ]; then
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touch "$root/etc/machine-id"
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fi
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mkdir -p -m 0755 \
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"/nix/var/nix/profiles/per-container/$INSTANCE" \
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"/nix/var/nix/gcroots/per-container/$INSTANCE"
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cp --remove-destination /etc/resolv.conf "$root/etc/resolv.conf"
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if [ "$PRIVATE_NETWORK" = 1 ]; then
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extraFlags+=" --network-veth"
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if [ -n "$HOST_BRIDGE" ]; then
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extraFlags+=" --network-bridge=$HOST_BRIDGE"
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fi
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if [ -n "$HOST_PORT" ]; then
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OIFS=$IFS
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IFS=","
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for i in $HOST_PORT
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do
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extraFlags+=" --port=$i"
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done
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IFS=$OIFS
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fi
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fi
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extraFlags+=" ${concatStringsSep " " (mapAttrsToList nspawnExtraVethArgs cfg.extraVeths)}"
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for iface in $INTERFACES; do
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extraFlags+=" --network-interface=$iface"
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done
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for iface in $MACVLANS; do
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extraFlags+=" --network-macvlan=$iface"
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done
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# If the host is 64-bit and the container is 32-bit, add a
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# --personality flag.
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${optionalString (config.nixpkgs.localSystem.system == "x86_64-linux") ''
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if [ "$(< ''${SYSTEM_PATH:-/nix/var/nix/profiles/per-container/$INSTANCE/system}/system)" = i686-linux ]; then
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extraFlags+=" --personality=x86"
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fi
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''}
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# Run systemd-nspawn without startup notification (we'll
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# wait for the container systemd to signal readiness).
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exec ${config.systemd.package}/bin/systemd-nspawn \
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--keep-unit \
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-M "$INSTANCE" -D "$root" $extraFlags \
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$EXTRA_NSPAWN_FLAGS \
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--notify-ready=yes \
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--bind-ro=/nix/store \
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--bind-ro=/nix/var/nix/db \
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--bind-ro=/nix/var/nix/daemon-socket \
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--bind="/nix/var/nix/profiles/per-container/$INSTANCE:/nix/var/nix/profiles" \
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--bind="/nix/var/nix/gcroots/per-container/$INSTANCE:/nix/var/nix/gcroots" \
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--setenv PRIVATE_NETWORK="$PRIVATE_NETWORK" \
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--setenv HOST_BRIDGE="$HOST_BRIDGE" \
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--setenv HOST_ADDRESS="$HOST_ADDRESS" \
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--setenv LOCAL_ADDRESS="$LOCAL_ADDRESS" \
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--setenv HOST_ADDRESS6="$HOST_ADDRESS6" \
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--setenv LOCAL_ADDRESS6="$LOCAL_ADDRESS6" \
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--setenv HOST_PORT="$HOST_PORT" \
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--setenv PATH="$PATH" \
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${if cfg.additionalCapabilities != null && cfg.additionalCapabilities != [] then
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''--capability="${concatStringsSep " " cfg.additionalCapabilities}"'' else ""
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} \
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${if cfg.tmpfs != null && cfg.tmpfs != [] then
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''--tmpfs=${concatStringsSep " --tmpfs=" cfg.tmpfs}'' else ""
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} \
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${containerInit cfg} "''${SYSTEM_PATH:-/nix/var/nix/profiles/system}/init"
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'';
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preStartScript = cfg:
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''
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# Clean up existing machined registration and interfaces.
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machinectl terminate "$INSTANCE" 2> /dev/null || true
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if [ "$PRIVATE_NETWORK" = 1 ]; then
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ip link del dev "ve-$INSTANCE" 2> /dev/null || true
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ip link del dev "vb-$INSTANCE" 2> /dev/null || true
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fi
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${concatStringsSep "\n" (
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mapAttrsToList (name: cfg:
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''ip link del dev ${name} 2> /dev/null || true ''
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) cfg.extraVeths
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)}
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'';
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postStartScript = (cfg:
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let
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ipcall = cfg: ipcmd: variable: attribute:
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if cfg.${attribute} == null then
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''
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if [ -n "${variable}" ]; then
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${ipcmd} add ${variable} dev $ifaceHost
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fi
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''
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else
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''${ipcmd} add ${cfg.${attribute}} dev $ifaceHost'';
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renderExtraVeth = name: cfg:
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if cfg.hostBridge != null then
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''
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# Add ${name} to bridge ${cfg.hostBridge}
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ip link set dev ${name} master ${cfg.hostBridge} up
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''
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else
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''
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# Set IPs and routes for ${name}
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${optionalString (cfg.hostAddress != null) ''
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ip addr add ${cfg.hostAddress} dev ${name}
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''}
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${optionalString (cfg.hostAddress6 != null) ''
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ip -6 addr add ${cfg.hostAddress6} dev ${name}
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''}
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${optionalString (cfg.localAddress != null) ''
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ip route add ${cfg.localAddress} dev ${name}
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''}
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${optionalString (cfg.localAddress6 != null) ''
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ip -6 route add ${cfg.localAddress6} dev ${name}
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''}
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'';
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in
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''
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if [ "$PRIVATE_NETWORK" = 1 ]; then
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if [ -z "$HOST_BRIDGE" ]; then
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ifaceHost=ve-$INSTANCE
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ip link set dev $ifaceHost up
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${ipcall cfg "ip addr" "$HOST_ADDRESS" "hostAddress"}
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${ipcall cfg "ip -6 addr" "$HOST_ADDRESS6" "hostAddress6"}
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${ipcall cfg "ip route" "$LOCAL_ADDRESS" "localAddress"}
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${ipcall cfg "ip -6 route" "$LOCAL_ADDRESS6" "localAddress6"}
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fi
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${concatStringsSep "\n" (mapAttrsToList renderExtraVeth cfg.extraVeths)}
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fi
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# Get the leader PID so that we can signal it in
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# preStop. We can't use machinectl there because D-Bus
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# might be shutting down. FIXME: in systemd 219 we can
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# just signal systemd-nspawn to do a clean shutdown.
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machinectl show "$INSTANCE" | sed 's/Leader=\(.*\)/\1/;t;d' > "/run/containers/$INSTANCE.pid"
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''
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);
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serviceDirectives = cfg: {
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ExecReload = pkgs.writeScript "reload-container"
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''
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#! ${pkgs.runtimeShell} -e
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${pkgs.nixos-container}/bin/nixos-container run "$INSTANCE" -- \
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bash --login -c "''${SYSTEM_PATH:-/nix/var/nix/profiles/system}/bin/switch-to-configuration test"
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'';
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SyslogIdentifier = "container %i";
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EnvironmentFile = "-/etc/containers/%i.conf";
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Type = "notify";
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# Note that on reboot, systemd-nspawn returns 133, so this
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# unit will be restarted. On poweroff, it returns 0, so the
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# unit won't be restarted.
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RestartForceExitStatus = "133";
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SuccessExitStatus = "133";
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Restart = "on-failure";
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# Hack: we don't want to kill systemd-nspawn, since we call
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# "machinectl poweroff" in preStop to shut down the
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# container cleanly. But systemd requires sending a signal
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# (at least if we want remaining processes to be killed
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# after the timeout). So send an ignored signal.
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KillMode = "mixed";
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KillSignal = "WINCH";
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DevicePolicy = "closed";
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DeviceAllow = map (d: "${d.node} ${d.modifier}") cfg.allowedDevices;
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};
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system = config.nixpkgs.localSystem.system;
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bindMountOpts = { name, ... }: {
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options = {
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mountPoint = mkOption {
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example = "/mnt/usb";
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type = types.str;
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description = "Mount point on the container file system.";
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};
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hostPath = mkOption {
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default = null;
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example = "/home/alice";
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type = types.nullOr types.str;
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description = "Location of the host path to be mounted.";
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};
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isReadOnly = mkOption {
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default = true;
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type = types.bool;
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description = "Determine whether the mounted path will be accessed in read-only mode.";
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};
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};
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config = {
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mountPoint = mkDefault name;
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};
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};
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allowedDeviceOpts = { ... }: {
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options = {
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node = mkOption {
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example = "/dev/net/tun";
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type = types.str;
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description = "Path to device node";
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};
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modifier = mkOption {
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example = "rw";
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type = types.str;
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description = ''
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Device node access modifier. Takes a combination
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<literal>r</literal> (read), <literal>w</literal> (write), and
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<literal>m</literal> (mknod). See the
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<literal>systemd.resource-control(5)</literal> man page for more
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information.'';
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};
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};
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};
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mkBindFlag = d:
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let flagPrefix = if d.isReadOnly then " --bind-ro=" else " --bind=";
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mountstr = if d.hostPath != null then "${d.hostPath}:${d.mountPoint}" else "${d.mountPoint}";
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in flagPrefix + mountstr ;
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mkBindFlags = bs: concatMapStrings mkBindFlag (lib.attrValues bs);
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networkOptions = {
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hostBridge = mkOption {
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type = types.nullOr types.string;
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default = null;
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example = "br0";
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description = ''
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Put the host-side of the veth-pair into the named bridge.
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Only one of hostAddress* or hostBridge can be given.
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'';
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};
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forwardPorts = mkOption {
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type = types.listOf (types.submodule {
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options = {
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protocol = mkOption {
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type = types.str;
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default = "tcp";
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description = "The protocol specifier for port forwarding between host and container";
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};
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hostPort = mkOption {
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type = types.int;
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description = "Source port of the external interface on host";
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};
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containerPort = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = "Target port of container";
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};
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};
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});
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default = [];
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example = [ { protocol = "tcp"; hostPort = 8080; containerPort = 80; } ];
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description = ''
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List of forwarded ports from host to container. Each forwarded port
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is specified by protocol, hostPort and containerPort. By default,
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protocol is tcp and hostPort and containerPort are assumed to be
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the same if containerPort is not explicitly given.
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'';
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};
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hostAddress = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "10.231.136.1";
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description = ''
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The IPv4 address assigned to the host interface.
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(Not used when hostBridge is set.)
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'';
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};
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hostAddress6 = mkOption {
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type = types.nullOr types.string;
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default = null;
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example = "fc00::1";
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description = ''
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The IPv6 address assigned to the host interface.
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(Not used when hostBridge is set.)
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'';
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};
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localAddress = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "10.231.136.2";
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description = ''
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The IPv4 address assigned to the interface in the container.
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If a hostBridge is used, this should be given with netmask to access
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the whole network. Otherwise the default netmask is /32 and routing is
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set up from localAddress to hostAddress and back.
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'';
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};
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localAddress6 = mkOption {
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type = types.nullOr types.string;
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default = null;
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example = "fc00::2";
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description = ''
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The IPv6 address assigned to the interface in the container.
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If a hostBridge is used, this should be given with netmask to access
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the whole network. Otherwise the default netmask is /128 and routing is
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set up from localAddress6 to hostAddress6 and back.
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'';
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};
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};
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dummyConfig =
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{
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extraVeths = {};
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additionalCapabilities = [];
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allowedDevices = [];
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hostAddress = null;
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hostAddress6 = null;
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localAddress = null;
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localAddress6 = null;
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tmpfs = null;
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};
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in
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{
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options = {
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boot.isContainer = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether this NixOS machine is a lightweight container running
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in another NixOS system.
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'';
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};
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boot.enableContainers = mkOption {
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type = types.bool;
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default = !config.boot.isContainer;
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description = ''
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Whether to enable support for nixos containers.
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'';
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};
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containers = mkOption {
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type = types.attrsOf (types.submodule (
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{ config, options, name, ... }:
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{
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options = {
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config = mkOption {
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description = ''
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A specification of the desired configuration of this
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container, as a NixOS module.
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'';
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type = lib.mkOptionType {
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name = "Toplevel NixOS config";
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merge = loc: defs: (import ../../lib/eval-config.nix {
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inherit system;
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modules =
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let extraConfig =
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{ boot.isContainer = true;
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networking.hostName = mkDefault name;
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networking.useDHCP = false;
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};
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in [ extraConfig ] ++ (map (x: x.value) defs);
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prefix = [ "containers" name ];
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}).config;
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};
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};
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path = mkOption {
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type = types.path;
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example = "/nix/var/nix/profiles/containers/webserver";
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description = ''
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As an alternative to specifying
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<option>config</option>, you can specify the path to
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the evaluated NixOS system configuration, typically a
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symlink to a system profile.
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'';
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};
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additionalCapabilities = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "CAP_NET_ADMIN" "CAP_MKNOD" ];
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description = ''
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Grant additional capabilities to the container. See the
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capabilities(7) and systemd-nspawn(1) man pages for more
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information.
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'';
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};
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enableTun = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Allows the container to create and setup tunnel interfaces
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by granting the <literal>NET_ADMIN</literal> capability and
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enabling access to <literal>/dev/net/tun</literal>.
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'';
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};
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privateNetwork = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to give the container its own private virtual
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Ethernet interface. The interface is called
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<literal>eth0</literal>, and is hooked up to the interface
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<literal>ve-<replaceable>container-name</replaceable></literal>
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on the host. If this option is not set, then the
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container shares the network interfaces of the host,
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and can bind to any port on any interface.
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'';
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};
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interfaces = mkOption {
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type = types.listOf types.string;
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default = [];
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example = [ "eth1" "eth2" ];
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description = ''
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The list of interfaces to be moved into the container.
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'';
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};
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macvlans = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "eth1" "eth2" ];
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description = ''
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The list of host interfaces from which macvlans will be
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created. For each interface specified, a macvlan interface
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will be created and moved to the container.
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'';
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};
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extraVeths = mkOption {
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type = with types; attrsOf (submodule { options = networkOptions; });
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default = {};
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description = ''
|
|
Extra veth-pairs to be created for the container
|
|
'';
|
|
};
|
|
|
|
autoStart = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = ''
|
|
Whether the container is automatically started at boot-time.
|
|
'';
|
|
};
|
|
|
|
bindMounts = mkOption {
|
|
type = with types; loaOf (submodule bindMountOpts);
|
|
default = {};
|
|
example = { "/home" = { hostPath = "/home/alice";
|
|
isReadOnly = false; };
|
|
};
|
|
|
|
description =
|
|
''
|
|
An extra list of directories that is bound to the container.
|
|
'';
|
|
};
|
|
|
|
allowedDevices = mkOption {
|
|
type = with types; listOf (submodule allowedDeviceOpts);
|
|
default = [];
|
|
example = [ { node = "/dev/net/tun"; modifier = "rw"; } ];
|
|
description = ''
|
|
A list of device nodes to which the containers has access to.
|
|
'';
|
|
};
|
|
|
|
tmpfs = mkOption {
|
|
type = types.listOf types.str;
|
|
default = [];
|
|
example = [ "/var" ];
|
|
description = ''
|
|
Mounts a set of tmpfs file systems into the container.
|
|
Multiple paths can be specified.
|
|
Valid items must conform to the --tmpfs argument
|
|
of systemd-nspawn. See systemd-nspawn(1) for details.
|
|
'';
|
|
};
|
|
|
|
extraFlags = mkOption {
|
|
type = types.listOf types.str;
|
|
default = [];
|
|
example = [ "--drop-capability=CAP_SYS_CHROOT" ];
|
|
description = ''
|
|
Extra flags passed to the systemd-nspawn command.
|
|
See systemd-nspawn(1) for details.
|
|
'';
|
|
};
|
|
|
|
} // networkOptions;
|
|
|
|
config = mkMerge
|
|
[
|
|
(mkIf options.config.isDefined {
|
|
path = config.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.postgresql96;
|
|
|
|
system.stateVersion = "17.03";
|
|
};
|
|
};
|
|
}
|
|
'';
|
|
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) (let
|
|
|
|
unit = {
|
|
description = "Container '%i'";
|
|
|
|
unitConfig.RequiresMountsFor = [ "/var/lib/containers/%i" ];
|
|
|
|
path = [ pkgs.iproute ];
|
|
|
|
environment.INSTANCE = "%i";
|
|
environment.root = "/var/lib/containers/%i";
|
|
|
|
preStart = preStartScript dummyConfig;
|
|
|
|
script = startScript dummyConfig;
|
|
|
|
postStart = postStartScript dummyConfig;
|
|
|
|
preStop =
|
|
''
|
|
pid="$(cat /run/containers/$INSTANCE.pid)"
|
|
if [ -n "$pid" ]; then
|
|
kill -RTMIN+4 "$pid"
|
|
fi
|
|
rm -f "/run/containers/$INSTANCE.pid"
|
|
'';
|
|
|
|
restartIfChanged = false;
|
|
|
|
serviceConfig = serviceDirectives dummyConfig;
|
|
};
|
|
in {
|
|
systemd.services = listToAttrs (filter (x: x.value != null) (
|
|
# The generic container template used by imperative containers
|
|
[{ name = "container@"; value = unit; }]
|
|
# declarative containers
|
|
++ (mapAttrsToList (name: cfg: nameValuePair "container@${name}" (let
|
|
config = cfg // (
|
|
if cfg.enableTun then
|
|
{
|
|
allowedDevices = cfg.allowedDevices
|
|
++ [ { node = "/dev/net/tun"; modifier = "rw"; } ];
|
|
additionalCapabilities = cfg.additionalCapabilities
|
|
++ [ "CAP_NET_ADMIN" ];
|
|
}
|
|
else {});
|
|
in
|
|
unit // {
|
|
preStart = preStartScript config;
|
|
script = startScript config;
|
|
postStart = postStartScript config;
|
|
serviceConfig = serviceDirectives config;
|
|
} // (
|
|
if config.autoStart then
|
|
{
|
|
wantedBy = [ "multi-user.target" ];
|
|
wants = [ "network.target" ];
|
|
after = [ "network.target" ];
|
|
restartTriggers = [ config.path ];
|
|
reloadIfChanged = true;
|
|
}
|
|
else {})
|
|
)) config.containers)
|
|
));
|
|
|
|
# Generate a configuration file in /etc/containers for each
|
|
# container so that container@.target can get the container
|
|
# configuration.
|
|
environment.etc =
|
|
let mkPortStr = p: p.protocol + ":" + (toString p.hostPort) + ":" + (if p.containerPort == null then toString p.hostPort else toString p.containerPort);
|
|
in mapAttrs' (name: cfg: nameValuePair "containers/${name}.conf"
|
|
{ text =
|
|
''
|
|
SYSTEM_PATH=${cfg.path}
|
|
${optionalString cfg.privateNetwork ''
|
|
PRIVATE_NETWORK=1
|
|
${optionalString (cfg.hostBridge != null) ''
|
|
HOST_BRIDGE=${cfg.hostBridge}
|
|
''}
|
|
${optionalString (length cfg.forwardPorts > 0) ''
|
|
HOST_PORT=${concatStringsSep "," (map mkPortStr cfg.forwardPorts)}
|
|
''}
|
|
${optionalString (cfg.hostAddress != null) ''
|
|
HOST_ADDRESS=${cfg.hostAddress}
|
|
''}
|
|
${optionalString (cfg.hostAddress6 != null) ''
|
|
HOST_ADDRESS6=${cfg.hostAddress6}
|
|
''}
|
|
${optionalString (cfg.localAddress != null) ''
|
|
LOCAL_ADDRESS=${cfg.localAddress}
|
|
''}
|
|
${optionalString (cfg.localAddress6 != null) ''
|
|
LOCAL_ADDRESS6=${cfg.localAddress6}
|
|
''}
|
|
''}
|
|
INTERFACES="${toString cfg.interfaces}"
|
|
MACVLANS="${toString cfg.macvlans}"
|
|
${optionalString cfg.autoStart ''
|
|
AUTO_START=1
|
|
''}
|
|
EXTRA_NSPAWN_FLAGS="${mkBindFlags cfg.bindMounts +
|
|
optionalString (cfg.extraFlags != [])
|
|
(" " + concatStringsSep " " cfg.extraFlags)}"
|
|
'';
|
|
}) config.containers;
|
|
|
|
# Generate /etc/hosts entries for the containers.
|
|
networking.extraHosts = concatStrings (mapAttrsToList (name: cfg: optionalString (cfg.localAddress != null)
|
|
''
|
|
${head (splitString "/" cfg.localAddress)} ${name}.containers
|
|
'') config.containers);
|
|
|
|
networking.dhcpcd.denyInterfaces = [ "ve-*" "vb-*" ];
|
|
|
|
services.udev.extraRules = optionalString config.networking.networkmanager.enable ''
|
|
# Don't manage interfaces created by nixos-container.
|
|
ENV{INTERFACE}=="v[eb]-*", ENV{NM_UNMANAGED}="1"
|
|
'';
|
|
|
|
environment.systemPackages = [ pkgs.nixos-container ];
|
|
});
|
|
}
|