900 lines
32 KiB
Nix
900 lines
32 KiB
Nix
{ config, lib, pkgs, ... }@host:
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with lib;
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let
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configurationPrefix = optionalString (versionAtLeast config.system.stateVersion "22.05") "nixos-";
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configurationDirectoryName = "${configurationPrefix}containers";
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configurationDirectory = "/etc/${configurationDirectoryName}";
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stateDirectory = "/var/lib/${configurationPrefix}containers";
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nixos-container = pkgs.nixos-container.override {
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inherit stateDirectory configurationDirectory;
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};
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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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#! ${pkgs.runtimeShell} -e
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# Exit early if we're asked to shut down.
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trap "exit 0" SIGRTMIN+3
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# Initialise the container side of the veth pair.
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if [ -n "$HOST_ADDRESS" ] || [ -n "$HOST_ADDRESS6" ] ||
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[ -n "$LOCAL_ADDRESS" ] || [ -n "$LOCAL_ADDRESS6" ] ||
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[ -n "$HOST_BRIDGE" ]; 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 $HOST_ADDRESS6
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fi
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fi
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${concatStringsSep "\n" (mapAttrsToList renderExtraVeth cfg.extraVeths)}
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# Start the regular stage 2 script.
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# We source instead of exec to not lose an early stop signal, which is
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# also the only _reliable_ shutdown signal we have since early stop
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# does not execute ExecStop* commands.
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set +e
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. "$1"
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''
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);
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nspawnExtraVethArgs = (name: cfg: "--network-veth-extra=${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/nixos-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+=" --private-network"
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fi
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if [ -n "$HOST_ADDRESS" ] || [ -n "$LOCAL_ADDRESS" ] ||
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[ -n "$HOST_ADDRESS6" ] || [ -n "$LOCAL_ADDRESS6" ]; then
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extraFlags+=" --network-veth"
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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=$OIFS
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fi
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if [ -n "$HOST_BRIDGE" ]; then
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extraFlags+=" --network-bridge=$HOST_BRIDGE"
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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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${optionalString (pkgs.stdenv.hostPlatform.system == "x86_64-linux") ''
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if [ "$(< ''${SYSTEM_PATH:-/nix/var/nix/profiles/per-container/$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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export SYSTEMD_NSPAWN_UNIFIED_HIERARCHY=1
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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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# Kill signal handling means systemd-nspawn will pass a system-halt signal
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# to the container systemd when it receives SIGTERM for container shutdown;
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# containerInit and stage2 have to handle this as well.
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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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--kill-signal=SIGRTMIN+3 \
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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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${optionalString (!cfg.ephemeral) "--link-journal=try-guest"} \
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--setenv PRIVATE_NETWORK="$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="$PATH" \
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${optionalString cfg.ephemeral "--ephemeral"} \
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${optionalString (cfg.additionalCapabilities != null && cfg.additionalCapabilities != [])
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''--capability="${concatStringsSep "," cfg.additionalCapabilities}"''
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} \
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${optionalString (cfg.tmpfs != null && cfg.tmpfs != [])
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''--tmpfs=${concatStringsSep " --tmpfs=" cfg.tmpfs}''
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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 "$INSTANCE" 2> /dev/null || true
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if [ -n "$HOST_ADDRESS" ] || [ -n "$LOCAL_ADDRESS" ] ||
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[ -n "$HOST_ADDRESS6" ] || [ -n "$LOCAL_ADDRESS6" ]; then
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ip link del dev "ve-$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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echo "Bring ${name} up"
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ip link set dev ${name} up
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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 ${name}
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''}
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'';
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in
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''
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if [ -n "$HOST_ADDRESS" ] || [ -n "$LOCAL_ADDRESS" ] ||
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[ -n "$HOST_ADDRESS6" ] || [ -n "$LOCAL_ADDRESS6" ]; then
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if [ -z "$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" "$LOCAL_ADDRESS6" "localAddress6"}
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fi
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fi
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${concatStringsSep "\n" (mapAttrsToList renderExtraVeth cfg.extraVeths)}
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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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#! ${pkgs.runtimeShell} -e
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${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 = "-${configurationDirectory}/%i.conf";
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Type = "notify";
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RuntimeDirectory = lib.optional cfg.ephemeral "${configurationDirectoryName}/%i";
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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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# Some containers take long to start
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# especially when you automatically start many at once
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TimeoutStartSec = cfg.timeoutStartSec;
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Restart = "on-failure";
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Slice = "machine.slice";
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Delegate = true;
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# We rely on systemd-nspawn turning a SIGTERM to itself into a shutdown
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# signal (SIGRTMIN+3) for the inner container.
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KillMode = "mixed";
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KillSignal = "TERM";
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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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kernelVersion = config.boot.kernelPackages.kernel.version;
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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 = lib.mdDoc "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 = lib.mdDoc "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 = lib.mdDoc "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 = lib.mdDoc "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 = lib.mdDoc ''
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Device node access modifier. Takes a combination
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`r` (read), `w` (write), and
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`m` (mknod). See the
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`systemd.resource-control(5)` 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.str;
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default = null;
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example = "br0";
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description = lib.mdDoc ''
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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 = lib.mdDoc "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 = lib.mdDoc "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 = lib.mdDoc "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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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.str;
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default = null;
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example = "fc00::1";
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description = lib.mdDoc ''
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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 = lib.mdDoc ''
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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.str;
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default = null;
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example = "fc00::2";
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description = lib.mdDoc ''
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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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ephemeral = false;
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timeoutStartSec = "1min";
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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 = lib.mdDoc ''
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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 = true;
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description = lib.mdDoc ''
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Whether to enable support for NixOS containers. Defaults to true
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(at no cost if containers are not actually used).
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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 = lib.mdDoc ''
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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 "${toString config.nixpkgs}/nixos/lib/eval-config.nix" {
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modules =
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let
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extraConfig = { options, ... }: {
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_file = "module at ${__curPos.file}:${toString __curPos.line}";
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config = {
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nixpkgs = if options.nixpkgs?hostPlatform && host.options.nixpkgs.hostPlatform.isDefined
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then { inherit (host.config.nixpkgs) hostPlatform; }
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else { inherit (host.config.nixpkgs) localSystem; }
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;
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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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assertions = [
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{
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assertion =
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(builtins.compareVersions kernelVersion "5.8" <= 0)
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-> config.privateNetwork
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-> stringLength name <= 11;
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message = ''
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Container name `${name}` is too long: When `privateNetwork` is enabled, container names can
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not be longer than 11 characters, because the container's interface name is derived from it.
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You should either make the container name shorter or upgrade to a more recent kernel that
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supports interface altnames (i.e. at least Linux 5.8 - please see https://github.com/NixOS/nixpkgs/issues/38509
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for details).
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'';
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}
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];
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};
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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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inherit (config) specialArgs;
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# The system is inherited from the host above.
|
|
# Set it to null, to remove the "legacy" entrypoint's non-hermetic default.
|
|
system = null;
|
|
}).config;
|
|
};
|
|
};
|
|
|
|
path = mkOption {
|
|
type = types.path;
|
|
example = "/nix/var/nix/profiles/per-container/webserver";
|
|
description = lib.mdDoc ''
|
|
As an alternative to specifying
|
|
{option}`config`, you can specify the path to
|
|
the evaluated NixOS system configuration, typically a
|
|
symlink to a system profile.
|
|
'';
|
|
};
|
|
|
|
additionalCapabilities = mkOption {
|
|
type = types.listOf types.str;
|
|
default = [];
|
|
example = [ "CAP_NET_ADMIN" "CAP_MKNOD" ];
|
|
description = lib.mdDoc ''
|
|
Grant additional capabilities to the container. See the
|
|
capabilities(7) and systemd-nspawn(1) man pages for more
|
|
information.
|
|
'';
|
|
};
|
|
|
|
nixpkgs = mkOption {
|
|
type = types.path;
|
|
default = pkgs.path;
|
|
defaultText = literalExpression "pkgs.path";
|
|
description = lib.mdDoc ''
|
|
A path to the nixpkgs that provide the modules, pkgs and lib for evaluating the container.
|
|
|
|
To only change the `pkgs` argument used inside the container modules,
|
|
set the `nixpkgs.*` options in the container {option}`config`.
|
|
Setting `config.nixpkgs.pkgs = pkgs` speeds up the container evaluation
|
|
by reusing the system pkgs, but the `nixpkgs.config` option in the
|
|
container config is ignored in this case.
|
|
'';
|
|
};
|
|
|
|
specialArgs = mkOption {
|
|
type = types.attrsOf types.unspecified;
|
|
default = {};
|
|
description = lib.mdDoc ''
|
|
A set of special arguments to be passed to NixOS modules.
|
|
This will be merged into the `specialArgs` used to evaluate
|
|
the NixOS configurations.
|
|
'';
|
|
};
|
|
|
|
ephemeral = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = lib.mdDoc ''
|
|
Runs container in ephemeral mode with the empty root filesystem at boot.
|
|
This way container will be bootstrapped from scratch on each boot
|
|
and will be cleaned up on shutdown leaving no traces behind.
|
|
Useful for completely stateless, reproducible containers.
|
|
|
|
Note that this option might require to do some adjustments to the container configuration,
|
|
e.g. you might want to set
|
|
{var}`systemd.network.networks.$interface.dhcpV4Config.ClientIdentifier` to "mac"
|
|
if you use {var}`macvlans` option.
|
|
This way dhcp client identifier will be stable between the container restarts.
|
|
|
|
Note that the container journal will not be linked to the host if this option is enabled.
|
|
'';
|
|
};
|
|
|
|
enableTun = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = lib.mdDoc ''
|
|
Allows the container to create and setup tunnel interfaces
|
|
by granting the `NET_ADMIN` capability and
|
|
enabling access to `/dev/net/tun`.
|
|
'';
|
|
};
|
|
|
|
privateNetwork = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = lib.mdDoc ''
|
|
Whether to give the container its own private virtual
|
|
Ethernet interface. The interface is called
|
|
`eth0`, and is hooked up to the interface
|
|
`ve-«container-name»`
|
|
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.
|
|
'';
|
|
};
|
|
|
|
interfaces = mkOption {
|
|
type = types.listOf types.str;
|
|
default = [];
|
|
example = [ "eth1" "eth2" ];
|
|
description = lib.mdDoc ''
|
|
The list of interfaces to be moved into the container.
|
|
'';
|
|
};
|
|
|
|
macvlans = mkOption {
|
|
type = types.listOf types.str;
|
|
default = [];
|
|
example = [ "eth1" "eth2" ];
|
|
description = lib.mdDoc ''
|
|
The list of host interfaces from which macvlans will be
|
|
created. For each interface specified, a macvlan interface
|
|
will be created and moved to the container.
|
|
'';
|
|
};
|
|
|
|
extraVeths = mkOption {
|
|
type = with types; attrsOf (submodule { options = networkOptions; });
|
|
default = {};
|
|
description = lib.mdDoc ''
|
|
Extra veth-pairs to be created for the container.
|
|
'';
|
|
};
|
|
|
|
autoStart = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = lib.mdDoc ''
|
|
Whether the container is automatically started at boot-time.
|
|
'';
|
|
};
|
|
|
|
timeoutStartSec = mkOption {
|
|
type = types.str;
|
|
default = "1min";
|
|
description = lib.mdDoc ''
|
|
Time for the container to start. In case of a timeout,
|
|
the container processes get killed.
|
|
See {manpage}`systemd.time(7)`
|
|
for more information about the format.
|
|
'';
|
|
};
|
|
|
|
bindMounts = mkOption {
|
|
type = with types; attrsOf (submodule bindMountOpts);
|
|
default = {};
|
|
example = literalExpression ''
|
|
{ "/home" = { hostPath = "/home/alice";
|
|
isReadOnly = false; };
|
|
}
|
|
'';
|
|
|
|
description =
|
|
lib.mdDoc ''
|
|
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 = lib.mdDoc ''
|
|
A list of device nodes to which the containers has access to.
|
|
'';
|
|
};
|
|
|
|
tmpfs = mkOption {
|
|
type = types.listOf types.str;
|
|
default = [];
|
|
example = [ "/var" ];
|
|
description = lib.mdDoc ''
|
|
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 = lib.mdDoc ''
|
|
Extra flags passed to the systemd-nspawn command.
|
|
See systemd-nspawn(1) for details.
|
|
'';
|
|
};
|
|
|
|
# Removed option. See `checkAssertion` below for the accompanying error message.
|
|
pkgs = mkOption { visible = false; };
|
|
} // networkOptions;
|
|
|
|
config = let
|
|
# Throw an error when removed option `pkgs` is used.
|
|
# Because this is a submodule we cannot use `mkRemovedOptionModule` or option `assertions`.
|
|
optionPath = "containers.${name}.pkgs";
|
|
files = showFiles options.pkgs.files;
|
|
checkAssertion = if options.pkgs.isDefined then throw ''
|
|
The option definition `${optionPath}' in ${files} no longer has any effect; please remove it.
|
|
|
|
Alternatively, you can use the following options:
|
|
- containers.${name}.nixpkgs
|
|
This sets the nixpkgs (and thereby the modules, pkgs and lib) that
|
|
are used for evaluating the container.
|
|
|
|
- containers.${name}.config.nixpkgs.pkgs
|
|
This only sets the `pkgs` argument used inside the container modules.
|
|
''
|
|
else null;
|
|
in {
|
|
path = builtins.seq checkAssertion
|
|
mkIf options.config.isDefined config.config.system.build.toplevel;
|
|
};
|
|
}));
|
|
|
|
default = {};
|
|
example = literalExpression
|
|
''
|
|
{ webserver =
|
|
{ path = "/nix/var/nix/profiles/webserver";
|
|
};
|
|
database =
|
|
{ config =
|
|
{ config, pkgs, ... }:
|
|
{ services.postgresql.enable = true;
|
|
services.postgresql.package = pkgs.postgresql_14;
|
|
|
|
system.stateVersion = "21.05";
|
|
};
|
|
};
|
|
}
|
|
'';
|
|
description = lib.mdDoc ''
|
|
A set of NixOS system configurations to be run as lightweight
|
|
containers. Each container appears as a service
|
|
`container-«name»`
|
|
on the host system, allowing it to be started and stopped via
|
|
{command}`systemctl`.
|
|
'';
|
|
};
|
|
|
|
};
|
|
|
|
|
|
config = mkIf (config.boot.enableContainers) (let
|
|
|
|
unit = {
|
|
description = "Container '%i'";
|
|
|
|
unitConfig.RequiresMountsFor = "${stateDirectory}/%i";
|
|
|
|
path = [ pkgs.iproute2 ];
|
|
|
|
environment = {
|
|
root = "${stateDirectory}/%i";
|
|
INSTANCE = "%i";
|
|
};
|
|
|
|
preStart = preStartScript dummyConfig;
|
|
|
|
script = startScript dummyConfig;
|
|
|
|
postStart = postStartScript dummyConfig;
|
|
|
|
restartIfChanged = false;
|
|
|
|
serviceConfig = serviceDirectives dummyConfig;
|
|
};
|
|
in {
|
|
warnings =
|
|
(optional (config.virtualisation.containers.enable && versionOlder config.system.stateVersion "22.05") ''
|
|
Enabling both boot.enableContainers & virtualisation.containers on system.stateVersion < 22.05 is unsupported.
|
|
'');
|
|
|
|
systemd.targets.multi-user.wants = [ "machines.target" ];
|
|
|
|
systemd.services = listToAttrs (filter (x: x.value != null) (
|
|
# The generic container template used by imperative containers
|
|
[{ name = "container@"; value = unit; }]
|
|
# declarative containers
|
|
++ (mapAttrsToList (name: cfg: nameValuePair "container@${name}" (let
|
|
containerConfig = cfg // (
|
|
optionalAttrs cfg.enableTun
|
|
{
|
|
allowedDevices = cfg.allowedDevices
|
|
++ [ { node = "/dev/net/tun"; modifier = "rw"; } ];
|
|
additionalCapabilities = cfg.additionalCapabilities
|
|
++ [ "CAP_NET_ADMIN" ];
|
|
}
|
|
);
|
|
in
|
|
recursiveUpdate unit {
|
|
preStart = preStartScript containerConfig;
|
|
script = startScript containerConfig;
|
|
postStart = postStartScript containerConfig;
|
|
serviceConfig = serviceDirectives containerConfig;
|
|
unitConfig.RequiresMountsFor = lib.optional (!containerConfig.ephemeral) "${stateDirectory}/%i";
|
|
environment.root = if containerConfig.ephemeral then "/run/nixos-containers/%i" else "${stateDirectory}/%i";
|
|
} // (
|
|
optionalAttrs containerConfig.autoStart
|
|
{
|
|
wantedBy = [ "machines.target" ];
|
|
wants = [ "network.target" ];
|
|
after = [ "network.target" ];
|
|
restartTriggers = [
|
|
containerConfig.path
|
|
config.environment.etc."${configurationDirectoryName}/${name}.conf".source
|
|
];
|
|
restartIfChanged = true;
|
|
}
|
|
)
|
|
)) config.containers)
|
|
));
|
|
|
|
# Generate a configuration file in /etc/nixos-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 "${configurationDirectoryName}/${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 = [
|
|
nixos-container
|
|
];
|
|
|
|
boot.kernelModules = [
|
|
"bridge"
|
|
"macvlan"
|
|
"tap"
|
|
"tun"
|
|
];
|
|
});
|
|
}
|