diff --git a/config/services/hydra/nix-config.nix b/config/services/hydra/nix-config.nix
index 03d7fb3..d599d18 100644
--- a/config/services/hydra/nix-config.nix
+++ b/config/services/hydra/nix-config.nix
@@ -1,13 +1,12 @@
-{ config, ... }: {
+{ config, lib, ... }: {
   nix.buildMachines = [
     {
       hostName = "localhost";
-      sshUser = "hydra-queue-runner";
-      maxJobs = 20;
-      speedFactor = 17;
+      protocol = null;
+      maxJobs = 0;
+      speedFactor = 0;
       systems = [ "x86_64-linux" ];
       supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
-      sshKey = config.sops.secrets."services/hydra/id_ed25519_hydra".path;
     }
     {
       hostName = "integra.kyouma.net";
@@ -18,8 +17,8 @@
       supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
       sshKey = config.sops.secrets."services/hydra/id_ed25519_hydra".path;
     }
-    {
-      hostName = "build-worker-03.nyantec.com";
+  ] ++ lib.forEach [ "03" "04" ] (num: {
+      hostName = "build-worker-${num}.nyantec.com";
       sshUser = "nix-ssh";
       maxJobs = 4;
       speedFactor = 18;
@@ -27,16 +26,15 @@
       supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" "gccarch-x86-64" "gccarch-x86-64-v2" "gccarch-x86-64-v3" ];
       sshKey = config.sops.secrets."services/hydra/id_ed25519_hydra".path;
     }
-    {
-      hostName = "build-worker-04.nyantec.com";
-      sshUser = "nix-ssh";
-      maxJobs = 4;
-      speedFactor = 18;
-      systems = [ "x86_64-linux" "riscv64-linux" ];
+  ) ++ lib.forEach [ "01" "02" "03" "04" ] (num: {
+      hostName = "build-worker-${num}";
+      sshUser = "root";
+      maxJobs = 6;
+      speedFactor = 20;
+      systems = [ "x86_64-linux" ];
       supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" "gccarch-x86-64" "gccarch-x86-64-v2" "gccarch-x86-64-v3" ];
       sshKey = config.sops.secrets."services/hydra/id_ed25519_hydra".path;
-    }
-  ];
+  });
   nix.settings = {
     allowed-uris = [
       "github:"
@@ -49,9 +47,29 @@
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE/vCXM3IaxJP9v2Y+xcQrQD2IcffgdzqtWhpMjj9Xl5 hydra@seras"
   ];
   programs.ssh = {
-    knownHosts."build-worker-03.nyantec.com".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEGqTY74c5g15DSNPNM2Wdr5jAwS7BFgX1XRnhtGOnJc";
-    knownHosts."build-worker-04.nyantec.com".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICOq+5I+nlAN2lJoOtoXrYEDuZ/TMPMa43pIlablYigK";
-    knownHosts."integra.kyouma.net".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIBwEQiSfaDrUAwgul4mktusBPcIVxI4pLNDh9DPopVU";
-    knownHosts."localhost".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPNVavo3YHVsrYwXRVISu7kDoknn+5inFGySn4azlB8P";
+    knownHosts = {
+      "build-worker-03.nyantec.com".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEGqTY74c5g15DSNPNM2Wdr5jAwS7BFgX1XRnhtGOnJc";
+      "build-worker-04.nyantec.com".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICOq+5I+nlAN2lJoOtoXrYEDuZ/TMPMa43pIlablYigK";
+      "integra.kyouma.net".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIBwEQiSfaDrUAwgul4mktusBPcIVxI4pLNDh9DPopVU";
+      "localhost".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPNVavo3YHVsrYwXRVISu7kDoknn+5inFGySn4azlB8P";
+      "[build-worker-kyoumanet.fly.dev]:2201".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDL2M97UBHg9aUfjDUxzmzg1r0ga0m3/stummBVwuEAB";
+      "[build-worker-kyoumanet.fly.dev]:2202".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOTwVKL0P0chPM2Gz23rbT94844+w1CGJdCaZdzfjThz";
+      "[build-worker-kyoumanet.fly.dev]:2203".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAjy2eZGJQeAYy0+fLgW9jiS0jVY2LInY0NDMnzCvvKp";
+      "[build-worker-kyoumanet.fly.dev]:2204".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIN72OyD9LYy4hq0WZ7ie5RPV+G54UreEJiA/RubjGoe9";
+    }; 
+    extraConfig = ''
+      Host build-worker-01
+        Hostname build-worker-kyoumanet.fly.dev
+        Port 2201
+      Host build-worker-02
+        Hostname build-worker-kyoumanet.fly.dev
+        Port 2202
+      Host build-worker-03
+        Hostname build-worker-kyoumanet.fly.dev
+        Port 2203
+      Host build-worker-04
+        Hostname build-worker-kyoumanet.fly.dev
+        Port 2204
+    '';
   };
 }
diff --git a/fly.toml b/fly.toml
new file mode 100644
index 0000000..4cf700a
--- /dev/null
+++ b/fly.toml
@@ -0,0 +1,77 @@
+app = 'build-worker-kyoumanet'
+primary_region = 'ams'
+
+[build]
+  image = 'registry.fly.io/build-worker-kyoumanet:latest'
+
+[processes]
+  bw-01 = '/entrypoint.sh'
+  bw-02 = '/entrypoint.sh'
+  bw-03 = '/entrypoint.sh'
+  bw-04 = '/entrypoint.sh'
+
+[[mounts]]
+  source = 'bw01'
+  destination = '/mnt/data'
+  initial_size = '128GB'
+  processes = ['bw-01']
+
+[[mounts]]
+  source = 'bw02'
+  destination = '/mnt/data'
+  initial_size = '128GB'
+  processes = ['bw-02']
+
+[[mounts]]
+  source = 'bw03'
+  destination = '/mnt/data'
+  initial_size = '128GB'
+  processes = ['bw-03']
+
+[[mounts]]
+  source = 'bw04'
+  destination = '/mnt/data'
+  initial_size = '128GB'
+  processes = ['bw-04']
+
+[[services]]
+  protocol = 'tcp'
+  internal_port = 2222
+  auto_stop_machines = 'off'
+  processes = ['bw-01']
+
+  [[services.ports]]
+    port = 2201
+
+[[services]]
+  protocol = 'tcp'
+  internal_port = 2222
+  auto_stop_machines = 'off'
+  processes = ['bw-02']
+
+  [[services.ports]]
+    port = 2202
+
+[[services]]
+  protocol = 'tcp'
+  internal_port = 2222
+  auto_stop_machines = 'off'
+  processes = ['bw-03']
+
+  [[services.ports]]
+    port = 2203
+
+[[services]]
+  protocol = 'tcp'
+  internal_port = 2222
+  auto_stop_machines = 'off'
+  processes = ['bw-04']
+
+  [[services.ports]]
+    port = 2204
+
+[[restart]]
+  policy = 'never'
+
+[[vm]]
+  size = 'performance-16x'