diff --git a/flake.lock b/flake.lock
index c0f89649..dffd629b 100644
--- a/flake.lock
+++ b/flake.lock
@@ -45,6 +45,22 @@
         "type": "github"
       }
     },
+    "nixpkgs-mobilizon": {
+      "locked": {
+        "lastModified": 1618222151,
+        "narHash": "sha256-8ridyy8En9gw6Zk2um0gYHRjsC4bU3n5Pg1nt9lhXpU=",
+        "owner": "minijackson",
+        "repo": "nixpkgs",
+        "rev": "84b45196fdca1056a8ff9d214c7ce553851ff1a7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "minijackson",
+        "ref": "init-mobilizon",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs_2": {
       "locked": {
         "lastModified": 1631792076,
@@ -65,6 +81,7 @@
       "inputs": {
         "nixos-hardware": "nixos-hardware",
         "nixpkgs": "nixpkgs",
+        "nixpkgs-mobilizon": "nixpkgs-mobilizon",
         "scrapers": "scrapers",
         "secrets": "secrets",
         "spacemsg": "spacemsg",
@@ -181,11 +198,11 @@
         "zentralwerk-network-key": "zentralwerk-network-key"
       },
       "locked": {
-        "lastModified": 1631903566,
-        "narHash": "sha256-mDeU4bc3pQ5sQbU2etnC1PxiW2W3EC3phXqhMDfyIkM=",
+        "lastModified": 1632071415,
+        "narHash": "sha256-bNRVgVwSJgEcSRgp3icC328rz/CAWrbgnbEJxEhjkTM=",
         "ref": "master",
-        "rev": "9db5d14bf109a7e467756fefebd694265ee31a53",
-        "revCount": 1176,
+        "rev": "d6b6e3a9207fef4760880af33f881104aa0adbe2",
+        "revCount": 1180,
         "type": "git",
         "url": "https://gitea.c3d2.de/zentralwerk/network.git"
       },
diff --git a/flake.nix b/flake.nix
index 01bcbb00..dc8b9f88 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,6 +3,7 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/release-21.05";
+    nixpkgs-mobilizon.url = "github:minijackson/nixpkgs/init-mobilizon";
     secrets.url = "git+ssh://git@gitea.c3d2.de:2222/c3d2-admins/secrets.git";
     zentralwerk.url = "git+https://gitea.c3d2.de/zentralwerk/network.git";
     yammat.url = "git+https://gitea.c3d2.de/astro/yammat.git?ref=nix";
@@ -17,7 +18,7 @@
     ticker.flake = false;
   };
 
-  outputs = { self, nixpkgs, secrets, nixos-hardware, zentralwerk, yammat, scrapers, spacemsg, tigger, ticker }:
+  outputs = inputs@{ self, nixpkgs, secrets, nixos-hardware, zentralwerk, yammat, scrapers, spacemsg, tigger, ticker, ... }:
     let
       forAllSystems = nixpkgs.lib.genAttrs [ "aarch64-linux" "x86_64-linux" ];
 
@@ -165,8 +166,8 @@
       nixosConfigurations = let
         nixosSystem' =
           # Our custom NixOS builder
-          { extraArgs ? {}, ... }@args:
-          nixpkgs.lib.nixosSystem (args // {
+          { nixpkgs ? inputs.nixpkgs, extraArgs ? {}, ... }@args:
+          nixpkgs.lib.nixosSystem (nixpkgs.lib.filterAttrs (n: _: n != "nixpkgs") args // {
             extraArgs = extraArgs // {
               inherit hostRegistry;
             };
@@ -327,6 +328,16 @@
           system = "x86_64-linux";
         };
 
+        mobilizon = nixosSystem' {
+          # TODO: pending https://github.com/NixOS/nixpkgs/pull/119132
+          nixpkgs = inputs.nixpkgs-mobilizon;
+          modules = [
+            ./lib/lxc-container.nix
+            ./hosts/containers/mobilizon
+          ];
+          system = "x86_64-linux";
+        };
+
       };
 
       nixosModules.c3d2 = import ./lib;
diff --git a/hosts/containers/mobilizon/default.nix b/hosts/containers/mobilizon/default.nix
new file mode 100644
index 00000000..2cb3e6f9
--- /dev/null
+++ b/hosts/containers/mobilizon/default.nix
@@ -0,0 +1,56 @@
+{ hostRegistry, config, ... }:
+{
+  c3d2.isInHq = false;
+  networking = {
+    hostName = "mobilizon";
+    interfaces.eth0.ipv4.addresses = [{
+      address = hostRegistry.hosts.${config.networking.hostName}.ip4;
+      prefixLength = 26;
+    }];
+    defaultGateway = "172.20.73.1";
+    firewall.allowedTCPPorts = [ 80 443 ];
+  };
+
+
+  services.mobilizon = {
+    enable = true;
+    settings.":mobilizon".":instance" = {
+      name = "C3D2 Mobilizon";
+      hostname = "mobilizon.c3d2.de";
+      registrations_open = true;
+      default_language = "de";
+    };
+    # settings.":mobilizon"."Mobilizon.Web.Email.Mailer" = {
+    #   adapter = { value = "Bamboo.SMTPAdapter"; _elixirType = "raw"; };
+    #   server = "mail.c3d2.de";
+    #   hostname = config.networking.hostName;
+    #   auth = { value = ":if_available"; _elixirType = "atom"; };
+    #   username = "mobilizon";
+    #   password = "noneyet";
+    #   port = 587;
+    #   ssl = false;
+    #   tls = { value = ":if_available"; _elixirType = "atom"; };
+    #   allowed_tls_versions = { value = ''[:tlsv1, :"tlsv1.1", :"tlsv1.2"]''; _elixirType = "raw"; };
+    #   retries = 1;
+    #   no_mx_lookups = true;
+    # };
+    settings.":mobilizon".":logger" = {
+      level = { value = ":all"; _elixirType = "atom"; };
+    };
+  };
+
+  services.nginx = {
+    enable = true;
+    recommendedProxySettings = true;
+    virtualHosts."mobilizon.c3d2.de" = {
+      default = true;
+      forceSSL = true;
+      enableACME = true;
+      locations."/".proxyPass = "http://localhost:4000";
+    };
+  };
+  security.acme = {
+    acceptTerms = true;
+    email = "mail@c3d2.de";
+  };
+}
diff --git a/hosts/containers/public-access-proxy/default.nix b/hosts/containers/public-access-proxy/default.nix
index 67d5930e..4fe7cf93 100644
--- a/hosts/containers/public-access-proxy/default.nix
+++ b/hosts/containers/public-access-proxy/default.nix
@@ -39,6 +39,10 @@
         hostNames = [ "stream.hq.c3d2.de" ];
         proxyTo.host = hostRegistry.hosts.stream.ip4;
       }
+      {
+        hostNames = [ "mobilizon.c3d2.de" ];
+        proxyTo.host = hostRegistry.hosts.mobilizon.ip4;
+      }
     ];
   };