switch-c1: deploy saal foyer

Flake lock file changes:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/b099eaa0e01a45fc3459bbe987c3405c425ef05c' (2022-03-01)
  → 'github:astro/nixpkgs/c12c305307b7861b8fe76cdbe314048476f1aef4' (2022-03-02)
• Updated input 'nixpkgs-master':
    'github:NixOS/nixpkgs/0a0255ddd063bc5d902fcd31c88319347c4383d4' (2022-03-01)
  → 'github:astro/nixpkgs/c12c305307b7861b8fe76cdbe314048476f1aef4' (2022-03-02)
• Updated input 'openwrt':
    'git+https://git.openwrt.org/openwrt/openwrt.git?ref=openwrt-21.02&rev=b2896d413e4a4ac6593b9473a8d1201ee9876a62' (2022-02-28)
  → 'git+https://git.openwrt.org/openwrt/openwrt.git?ref=openwrt-21.02&rev=7bd583e5f31e5c42df47f0286b0dcbc6df30765e' (2022-03-02)

README.md

@@ -123,17 +123,6 @@ $EDITOR config/secrets-production.nix
 nix run .#encrypt-secrets
 ```
 
-### server1 als Cold Standby
-
-Was ein Server kann, kann ein anderer auch. Er sollte gelegentlich
-gebootet und aufgefrischt werden.
-
-Damit die LXC-Container ganz kontrolliert nur auf einem gestartet
-werden, muss die Datei `/etc/start-containers` *vorhanden* sein. Zum
-Umgang damit gibt es die zwei handlichen Befehle `enable-containers`
-und `disable-containers`.
-
-
 #### IP Subnet Plans
 
 `nix build .#`[subnetplan4](https://hydra.hq.c3d2.de/job/c3d2/zentralwerk-network/subnetplans/latest/download/1)

config/secrets.nix

@@ -265,4 +265,8 @@
       ];
     } ];
   };
+
+  site.cluster = {
+    corosync.authKey = "8V82ry1A6Ki6EXWj2X8PJYC89xITLsgFteQbr6tiegUQLbbtMzWmT8ynyVn5cHiah52ANNfQk6yLrvAJrVDVlTFowG5D1GClOHQmmZi+Xv3nJ2fCUjCYa97/tSdV/1NnsNKkxMxJndef2TrknHAR4DBAM32USADBhP94nuv5FmdMOTLBDbvdlOrCGbdnaZKgIrhuN61atQ1iRexz0prHO+3WfOEx39N+Tzr4";
+  };
 }

config/server.nix

@@ -36,5 +36,11 @@ in
     sshPubKeys = [
       "ssh-rsa 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 root@server1"
     ];
+
+    # network infrastructure that is essential for server operation
+    cluster.pacemaker.pingdHosts = [
+      "switch-b1"
+      "switch-c1"
+    ];
   };
 }

config/switch.nix

@@ -205,6 +205,8 @@
         iso4.ports = [ "12" ];
         iso5.ports = [ "13" ];
         iso6.ports = [ "14" ];
+        # Saal Foyer
+        priv-25.ports = [ "20" ];
       };
     };
 

flake.lock

@@ -2,31 +2,32 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1646162891,
-        "narHash": "sha256-Yoyur5LD3nRKFZRwVi2lHZi2HKoWUJFAHgIFcYsRhho=",
-        "owner": "NixOS",
+        "lastModified": 1646257734,
+        "narHash": "sha256-Yexj0oZNztMo2WDBj3LhBJUCiVD++Zu28UPrAyJ5uTs=",
+        "owner": "astro",
         "repo": "nixpkgs",
-        "rev": "b099eaa0e01a45fc3459bbe987c3405c425ef05c",
+        "rev": "c12c305307b7861b8fe76cdbe314048476f1aef4",
         "type": "github"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "release-21.11",
+        "owner": "astro",
+        "ref": "pacemaker",
         "repo": "nixpkgs",
         "type": "github"
       }
     },
     "nixpkgs-master": {
       "locked": {
-        "lastModified": 1646163513,
-        "narHash": "sha256-zIrQEi+iXEWVfCsGQqqTiYSrkCYGTCXxSL6TF5Rqwlk=",
-        "owner": "NixOS",
+        "lastModified": 1646257734,
+        "narHash": "sha256-Yexj0oZNztMo2WDBj3LhBJUCiVD++Zu28UPrAyJ5uTs=",
+        "owner": "astro",
         "repo": "nixpkgs",
-        "rev": "0a0255ddd063bc5d902fcd31c88319347c4383d4",
+        "rev": "c12c305307b7861b8fe76cdbe314048476f1aef4",
         "type": "github"
       },
       "original": {
-        "owner": "NixOS",
+        "owner": "astro",
+        "ref": "pacemaker",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -34,11 +35,11 @@
     "openwrt": {
       "flake": false,
       "locked": {
-        "lastModified": 1646058092,
-        "narHash": "sha256-XZmvtONx6Y0XpwFHoq/9+HTAbVppo4c8JowbVMen6ds=",
+        "lastModified": 1646224172,
+        "narHash": "sha256-vyKtdF4wX6abAJfFDMH/TSdIa+DSZ3nTgVbAiFZTAIo=",
         "ref": "openwrt-21.02",
-        "rev": "b2896d413e4a4ac6593b9473a8d1201ee9876a62",
-        "revCount": 50965,
+        "rev": "7bd583e5f31e5c42df47f0286b0dcbc6df30765e",
+        "revCount": 50966,
         "type": "git",
         "url": "https://git.openwrt.org/openwrt/openwrt.git"
       },

flake.nix

@@ -2,8 +2,8 @@
   description = "Zentralwerk network";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/release-21.11";
-    nixpkgs-master.url = "github:NixOS/nixpkgs";
+    nixpkgs.url = "github:astro/nixpkgs/pacemaker";
+    nixpkgs-master.url = "github:astro/nixpkgs/pacemaker";
     openwrt.url = "git+https://git.openwrt.org/openwrt/openwrt.git?ref=openwrt-21.02";
     openwrt.flake = false;
   };

nix/lib/config/options.nix

@@ -577,6 +577,17 @@ in
     };
 
     vpn.wireguard = vpnOpts;
+
+    cluster.corosync.authKey = mkOption {
+      type = types.str;
+    };
+    cluster.pacemaker.pingdHosts = mkOption {
+      type = with types; listOf str;
+      default = [];
+      description = ''
+        Let Pacemaker ping these hosts to determine health.
+      '';
+    };
   };
 
   config.warnings =

nix/nixos-module/server/cluster.nix

@@ -0,0 +1,154 @@
+{ config, lib, pkgs, ... }:
+let
+  hostsWithRole = wantedRole: builtins.attrNames (
+    lib.filterAttrs (_: { role, ... }:
+      role == wantedRole
+    ) config.site.hosts
+  );
+in
+{
+  environment.systemPackages =
+    with pkgs;
+    let
+      setup-glusterfs =
+        let
+        in writeScriptBin "setup-glusterfs" ''
+          #! ${runtimeShell} -e
+
+          DIR="$1"
+          if [ -z "$DIR" ]; then
+            echo "Usage: $0 <backing-dir>"
+            exit 1
+          fi
+
+          while ! systemctl is-active glusterd.service ; do
+            echo "Wait for glusterd.service"
+            sleep 1
+          done
+
+          ${lib.concatMapStrings (server: ''
+            gluster peer probe ${server}
+          '') (hostsWithRole "server")}
+          gluster peer status
+
+          gluster volume create lxc ${lib.concatMapStringsSep " " (server:
+            "\"${server}:$DIR\""
+          ) (hostsWithRole "server")} force
+          gluster volume set lxc network.ping-timeout 2
+          gluster volume start lxc
+
+          systemctl start var-lib-lxc.mount
+          mkdir /var/lib/lxc/rootfs
+        '';
+      setup-pacemaker =
+        let
+          resources = builtins.toFile "cib-resources.xml" ''
+            <resources>
+              ${lib.concatMapStrings (container: ''
+                <primitive id="lxc-${container}" class="systemd" type="lxc@${container}">
+                  <operations>
+                    <op id="stop-${container}" name="start" interval="0" timeout="10s"/>
+                    <op id="start-${container}" name="start" interval="0" timeout="10s"/>
+                    <op id="monitor-${container}" name="monitor" interval="10s" timeout="10s"/>
+                  </operations>
+                </primitive>
+              '') (hostsWithRole "container")}
+
+              <clone id="Connected">
+                <primitive id="ping" provider="pacemaker" class="ocf" type="ping">
+                  <instance_attributes id="ping-attrs">
+                    <nvpair id="pingd-dampen" name="dampen" value="5s"/>
+                    <nvpair id="pingd-timeout" name="timeout" value="2s"/>
+                    <nvpair id="pingd-multiplier" name="multiplier" value="1000"/>
+                    <nvpair id="pingd-hosts" name="host_list" value="${
+                       lib.concatMapStringsSep " " (host:
+                         if config.site.net.mgmt.hosts4 ? ${host}
+                         then config.site.net.mgmt.hosts4.${host}
+                         else host
+                       ) config.site.cluster.pacemaker.pingdHosts
+                     }"/>
+                  </instance_attributes>
+                  <operations>
+                    <op id="ping-monitor-10s" interval="10s" name="monitor"/>
+                  </operations>
+                </primitive>
+              </clone>
+            </resources>
+          '';
+          constraints = builtins.toFile "cib-constraints.xml" ''
+            <constraints>
+              ${lib.optionalString (! config.virtualisation ? qemu) (
+                lib.concatMapStrings (server: ''
+                  <rsc_location id="ping-on-${server}" node="${server}" rsc="ping" score="100"/>
+                '') (hostsWithRole "server")
+              )}
+            </constraints>
+          '';
+        in writeScriptBin "setup-pacemaker" ''
+          #! ${runtimeShell} -e
+
+          while ! systemctl is-active corosync.service ; do
+            echo "Wait for corosync.service"
+            sleep 1
+          done
+          while ! systemctl is-active pacemaker.service ; do
+            echo "Wait for pacemaker.service"
+            sleep 1
+          done
+
+          crm_attribute -t crm_config -n stonith-enabled -v false
+          cibadmin --replace --scope resources --xml-file ${resources}
+          cibadmin --replace --scope constraints --xml-file ${constraints}
+          crm_attribute --name placement-strategy --update balanced
+        '';
+    in [
+      setup-glusterfs
+      setup-pacemaker
+    ];
+
+  boot.supportedFilesystems = [ "glusterfs" ];
+  fileSystems."/var/lib/lxc" = {
+    fsType = "glusterfs";
+    device = "localhost:/lxc";
+    options = [ "nofail" ];
+  };
+
+  services.corosync = {
+    enable = true;
+    clusterName = "zentralwerk-network";
+    nodelist =
+      lib.imap (n: hostName: {
+        nodeid = n;
+        name = hostName;
+        ring_addrs = map (net:
+          config.site.net.${net}.hosts4.${hostName}
+        ) [ "mgmt" ];
+      }) (
+        builtins.filter (hostName:
+          config.site.hosts.${hostName}.role == "server"
+        ) (builtins.attrNames config.site.hosts)
+      );
+  };
+  environment.etc."corosync/authkey" = {
+    source = builtins.toFile "authkey" config.site.cluster.corosync.authKey;
+    mode = "0400";
+  };
+
+  services.pacemaker.enable = true;
+
+  services.glusterfs.enable = true;
+  networking.firewall.trustedInterfaces = [ "mgmt" ];
+
+  networking.hosts = lib.mkMerge (
+    map (hostName:
+      builtins.foldl' (hosts: addr: hosts // {
+        "${addr}" = [ hostName ];
+      }) {} (
+        [
+          config.site.net.mgmt.hosts4.${hostName}
+        ] ++ map (hosts6: hosts6.${hostName}) (
+          builtins.attrValues config.site.net.mgmt.hosts6
+        )
+      )) (hostsWithRole "server")
+  );
+}

nix/nixos-module/server/default.nix

@@ -5,6 +5,7 @@
     ./network.nix
     ./lxc-containers.nix
     ./qemu.nix
+    ./cluster.nix
     # host-specific configuration
     (./. + "/${hostName}.nix")
   ];

nix/nixos-module/server/defaults.nix

@@ -8,9 +8,9 @@
   time.timeZone = "Europe/Berlin";
 
   environment.systemPackages = with pkgs; [
-    wget vim git screen
-    ipmitool
-  ];
+      wget vim git screen
+      ipmitool
+    ];
   services.openssh.enable = true;
   services.openssh.permitRootLogin = "prohibit-password";
 

nix/nixos-module/server/lxc-containers.nix

@@ -131,22 +131,12 @@ let
           systemctl restart lxc@$c
         )
       else
-        echo Starting $c
-        systemctl start lxc@$c
+        echo Clearing pacemaker state for container $c
+        crm_resource -r lxc-$c -C
       fi
     done
     set -e
   '';
-
-  enable-script = pkgs.writeScriptBin "enable-containers" ''
-    touch /etc/start-containers
-    systemctl start lxc-containers.target
-  '';
-
-  disable-script = pkgs.writeScriptBin "disable-containers" ''
-    rm /etc/start-containers
-    systemctl stop lxc-containers.target lxc@\*.service
-  '';
 in
 {
   boot.kernel.sysctl = lib.mkIf enabled {
@@ -172,8 +162,6 @@ in
   environment.systemPackages = [
     # `lxc-attach` et al
     pkgs.lxc build-script
-    # User scripts
-    enable-script disable-script
   ];
 
   # Create lxc.container.conf files
@@ -227,7 +215,6 @@ in
     after = [ "network.target" ];
     unitConfig.ConditionPathExists = [
       "/var/lib/lxc/%i/rootfs/init"
-      "/etc/start-containers"
     ];
     serviceConfig = with pkgs; {
       Type = "simple";
@@ -249,11 +236,4 @@ in
       RestartSec = "1s";
     };
   };
-
-  # Starts all the containers after boot
-  systemd.targets.lxc-containers = {
-    wantedBy = [ "multi-user.target" ];
-    wants = map (ctName: "lxc@${ctName}.service")
-      (builtins.attrNames containers);
-  };
 }

nix/nixos-module/server/network.nix

@@ -85,6 +85,14 @@ in
           EmitLLDP = true;
         };
       };
+      "00-qemu-tap" = {
+        # physical ethernet ports
+        matchConfig.MACAddress = {
+          server1 = "00:02:23:de:ad:41";
+          server2 = "00:02:23:de:ad:42";
+        }.${hostName};
+        networkConfig.Bond = "bond0";
+      };
       bond0 = {
         DHCP = "no";
         matchConfig.Name = "bond0";

nix/nixos-module/server/qemu.nix

@@ -1,5 +1,5 @@
 # Options for running under qemu (vm-packages)
-{ inputs, lib, options, ... }:
+{ inputs, config, lib, options, ... }:
 {
   # Get internet from qemu user networking
   systemd.network = lib.optionalAttrs (options.virtualisation ? qemu) {
@@ -23,6 +23,16 @@
     # keep the store paths built inside the VM across reboots
     writableStoreUseTmpfs = false;
     qemu.options = [ "-enable-kvm" ];
+    qemu.networkingOptions = [
+      # Useful for cluster dev
+      "-device" "virtio-net-pci,id=bond,netdev=bond,mac=${config.systemd.network.networks."00-qemu-tap".matchConfig.MACAddress}"
+      "-netdev" "tap,id=bond,ifname=${config.networking.hostName},script=no,downscript=no"
+    ];
+    fileSystems."/var/lib/lxc" = {
+      fsType = "glusterfs";
+      device = "localhost:/lxc";
+      options = [ "nofail" ];
+    };
   };
 
   # Let the nix registry point to the state of your local checkout