nix/nixos-module/server/lxc-containers: make container config independend of host system
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@ -0,0 +1,111 @@
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{ config, lib, ... }:
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let
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inherit (config.networking) hostName;
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# linux iface name max length = 15
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shortenNetName = name:
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if builtins.match "priv(.*)" name != null
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then "p" + builtins.substring 4 9 name
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else if name == "coloradio"
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then "cr"
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else if name == "coloradio-gw"
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then "cr-gw"
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else name;
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checkIfname = ifname: let
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len = builtins.stringLength ifname;
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in if len > 15
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then throw "Interface name ${ifname} is ${toString (len - 15)} chars too long."
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else ifname;
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# `lxc.net.*` formatter for lxc.container.conf files
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netConfig = ctName: interfaces:
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let
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config = map (netName:
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let
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ifData = interfaces.${netName};
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in {
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type = ifData.type;
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name = checkIfname netName;
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flags = "up";
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hwaddr = if ifData ? hwaddr && ifData.hwaddr != null
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then ifData.hwaddr
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else "0A:14:48:xx:xx:xx";
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} // (lib.optionalAttrs (ifData.type == "veth") {
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veth.pair = checkIfname "${shortenNetName ctName}-${shortenNetName netName}";
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veth.mode = checkIfname "bridge";
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link = checkIfname netName;
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}) // (lib.optionalAttrs (ifData.type == "phys") {
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link = checkIfname "ext-${netName}";
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})
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) (builtins.attrNames interfaces);
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attrNamesOrdered = attrs:
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if attrs ? type
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then [ "type" ] ++ lib.remove "type" (builtins.attrNames attrs)
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else builtins.attrNames attrs;
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serialize = name: x:
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if builtins.isString x
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then "${name} = ${x}\n"
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else if builtins.isAttrs x
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then builtins.concatStringsSep "" (
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map (n: serialize "${name}.${n}" x.${n}) (attrNamesOrdered x)
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)
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else if builtins.isList x
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then
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let
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enumerate = xs: n:
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if xs == []
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then []
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else [ {
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e = builtins.head xs;
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i = n;
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} ] ++ enumerate (builtins.tail xs) (n + 1);
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in
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builtins.concatStringsSep "" (
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map ({ e, i }: serialize "${name}.${toString i}" e) (enumerate x 0)
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)
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else throw "Invalid data in lxc net config for ${name}: ${lib.generators.toPretty {} x}";
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in
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serialize "lxc.net" config;
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in
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{
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system.build.lxcConfig = builtins.toFile "${hostName}.conf" ''
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# For lxcfs and sane defaults
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lxc.include = /etc/lxc/common.conf
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lxc.uts.name = ${hostName}
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# Handled by lxc@.service
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lxc.start.auto = 0
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lxc.rootfs.path = /var/lib/lxc/${hostName}/rootfs
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lxc.init.cmd = "/init"
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lxc.mount.entry = /nix/store nix/store none bind,ro 0 0
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lxc.mount.entry = none tmp tmpfs defaults 0 0
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lxc.mount.auto = proc:mixed sys:ro cgroup:mixed
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lxc.autodev = 1
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lxc.tty.max = 0
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lxc.pty.max = 8
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lxc.cap.drop = sys_module sys_time sys_nice sys_pacct sys_rawio
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security.privileged = false
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lxc.apparmor.profile = lxc-container-default-with-mounting
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lxc.cgroup.memory.limit_in_bytes = 1G
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lxc.cgroup.memory.kmem.tcp.limit_in_bytes = 128M
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# tuntap
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lxc.cgroup.devices.allow = c 10:200 rw
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lxc.cgroup2.devices.allow = c 10:200 rw
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# ppp
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lxc.cgroup.devices.allow = c 108:0 rwm
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lxc.cgroup2.devices.allow = c 108:0 rwm
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${netConfig hostName config.site.hosts.${hostName}.physicalInterfaces}
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'';
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}
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@ -20,6 +20,7 @@ in {
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./server/default.nix
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] ++
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optionals (hostConfig.role == "container") [
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./container/lxc-config.nix
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./container/defaults.nix
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./container/dhcp-server.nix
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./container/wireguard.nix
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@ -10,74 +10,6 @@ let
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enabled = containers != {};
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# linux iface name max length = 15
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shortenNetName = name:
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if builtins.match "priv(.*)" name != null
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then "p" + builtins.substring 4 9 name
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else if name == "coloradio"
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then "cr"
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else if name == "coloradio-gw"
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then "cr-gw"
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else name;
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checkIfname = ifname: let
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len = builtins.stringLength ifname;
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in if len > 15
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then throw "Interface name ${ifname} is ${toString (len - 15)} chars too long."
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else ifname;
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# `lxc.net.*` formatter for lxc.container.conf files
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netConfig = ctName: interfaces:
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let
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config = map (netName:
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let
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ifData = interfaces.${netName};
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in {
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type = ifData.type;
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name = checkIfname netName;
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flags = "up";
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hwaddr = if ifData ? hwaddr && ifData.hwaddr != null
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then ifData.hwaddr
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else "0A:14:48:xx:xx:xx";
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} // (lib.optionalAttrs (ifData.type == "veth") {
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veth.pair = checkIfname "${shortenNetName ctName}-${shortenNetName netName}";
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veth.mode = checkIfname "bridge";
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link = checkIfname netName;
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}) // (lib.optionalAttrs (ifData.type == "phys") {
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link = checkIfname "ext-${netName}";
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})
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) (builtins.attrNames interfaces);
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attrNamesOrdered = attrs:
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if attrs ? type
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then [ "type" ] ++ lib.remove "type" (builtins.attrNames attrs)
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else builtins.attrNames attrs;
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serialize = name: x:
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if builtins.isString x
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then "${name} = ${x}\n"
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else if builtins.isAttrs x
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then builtins.concatStringsSep "" (
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map (n: serialize "${name}.${n}" x.${n}) (attrNamesOrdered x)
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)
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else if builtins.isList x
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then
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let
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enumerate = xs: n:
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if xs == []
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then []
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else [ {
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e = builtins.head xs;
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i = n;
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} ] ++ enumerate (builtins.tail xs) (n + 1);
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in
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builtins.concatStringsSep "" (
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map ({ e, i }: serialize "${name}.${toString i}" e) (enumerate x 0)
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)
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else throw "Invalid data in lxc net config for ${name}: ${lib.generators.toPretty {} x}";
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in
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serialize "lxc.net" config;
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# User-facing script to build/update container NixOS systems
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build-script = pkgs.writeScriptBin "build-container" ''
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#! ${pkgs.runtimeShell} -e
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@ -98,6 +30,7 @@ let
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${ctName})
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echo Using prebuilt system for container $c
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SYSTEM=${self.packages.x86_64-linux."${ctName}-rootfs"}
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CONFIG=${self.packages.x86_64-linux."${ctName}-lxc-config"}
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;;
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'') (
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builtins.attrNames (
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@ -109,6 +42,8 @@ let
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echo Building $c
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nix build -o /nix/var/nix/gcroots/lxc/$c zentralwerk-network#$c-rootfs
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SYSTEM=$(readlink /nix/var/nix/gcroots/lxc/$c)
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nix build -o /nix/var/nix/gcroots/lxc/$c.config zentralwerk-network#$c-lxc-config
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CONFIG=$(readlink /nix/var/nix/gcroots/lxc/$c.config)
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;;
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esac
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@ -121,6 +56,7 @@ let
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mkdir -p /var/lib/lxc/$c/rootfs/$d
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done
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ln -fs $SYSTEM/init /var/lib/lxc/$c/rootfs/init
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ln -fs $CONFIG /var/lib/lxc/$c/config
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done
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# Activate all the desired container after all of them are
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@ -166,10 +102,8 @@ in
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virtualisation.lxc = lib.mkIf enabled {
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enable = true;
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# Container configs live in /etc so that they can be created
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# through `environment.etc`.
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systemConfig = ''
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lxc.lxcpath = /etc/lxc/containers
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lxc.lxcpath = /var/lib/lxc
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'';
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};
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@ -180,50 +114,7 @@ in
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enable-script disable-script
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];
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# Create lxc.container.conf files
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environment.etc =
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builtins.foldl' (etc: ctName: etc // {
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"lxc/containers/${ctName}/config" = {
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enable = true;
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source =
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builtins.toFile "${ctName}.conf" ''
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# For lxcfs and sane defaults
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lxc.include = /etc/lxc/common.conf
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lxc.uts.name = ${ctName}
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# Handled by lxc@.service
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lxc.start.auto = 0
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lxc.rootfs.path = /var/lib/lxc/${ctName}/rootfs
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lxc.init.cmd = "/init"
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lxc.mount.entry = /nix/store nix/store none bind,ro 0 0
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lxc.mount.entry = none tmp tmpfs defaults 0 0
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lxc.mount.auto = proc:mixed sys:ro cgroup:mixed
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lxc.autodev = 1
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lxc.tty.max = 0
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lxc.pty.max = 8
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lxc.cap.drop = sys_module sys_time sys_nice sys_pacct sys_rawio
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security.privileged = false
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lxc.apparmor.profile = lxc-container-default-with-mounting
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lxc.cgroup.memory.limit_in_bytes = 1G
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lxc.cgroup.memory.kmem.tcp.limit_in_bytes = 128M
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# tuntap
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lxc.cgroup.devices.allow = c 10:200 rw
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lxc.cgroup2.devices.allow = c 10:200 rw
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# ppp
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lxc.cgroup.devices.allow = c 108:0 rwm
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lxc.cgroup2.devices.allow = c 108:0 rwm
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${netConfig ctName containers.${ctName}.physicalInterfaces}
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'';
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};
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}) {
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"lxc/common.conf".source = "${pkgs.lxc}/share/lxc/config/common.conf";
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} (builtins.attrNames containers);
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environment.etc."lxc/common.conf".source = "${pkgs.lxc}/share/lxc/config/common.conf";
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# Systemd service template for LXC containers
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systemd.services."lxc@" = {
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@ -57,6 +57,19 @@ let
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)
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);
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mkLxcConfig = hostName:
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self.nixosConfigurations.${hostName}.config.system.build.lxcConfig;
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lxc-configs =
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builtins.foldl' (rootfs: hostName: rootfs // {
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"${hostName}-lxc-config" = mkLxcConfig hostName;
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}) {} (
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builtins.attrNames (
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nixpkgs.lib.filterAttrs (_: { role, ... }: role == "container")
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config.site.hosts
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)
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);
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vm-packages =
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builtins.foldl' (rootfs: hostName: rootfs // {
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"${hostName}-vm" = self.nixosConfigurations.${hostName}.config.system.build.vm
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@ -117,7 +130,7 @@ let
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inherit self;
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};
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in
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rootfs-packages // vm-packages // device-templates // openwrt-packages // network-graphs // network-cypher-graphs // starlink // subnetplans // {
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rootfs-packages // lxc-configs // vm-packages // device-templates // openwrt-packages // network-graphs // network-cypher-graphs // starlink // subnetplans // {
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inherit export-openwrt-models export-config dns-slaves
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encrypt-secrets decrypt-secrets switch-to-production
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homepage gateway-report switch-report vlan-report
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