FlakM · October 28, 2025 15:21 · Apr 8, 2024 · May 22, 2023 · May 22, 2023 · May 22, 2023
diff --git a/nix vm using flake.md b/nix vm using flake.md
@@ -32,7 +32,8 @@ Did you know that it is rather easy to setup a VM to test your NixOs configurati
 { config, lib, pkgs, ... }: {
   # customize kernel version
   boot.kernelPackages = pkgs.linuxPackages_5_15;
-
+  
+  users.groups.admin = {};
   users.users = {
     admin = {
       isNormalUser = true;

diff --git a/nix_vm.md → nix vm using flake.md b/nix_vm.md → nix vm using flake.md
@@ -1,3 +1,7 @@
+# Setting up qemu VM using nix flakes
+
+Did you know that it is rather easy to setup a VM to test your NixOs configuration?
+
 ## Create simple flake: 
 
 ```nix

diff --git a/nix_vm.md b/nix_vm.md
@@ -1,14 +1,13 @@
 ## Create simple flake: 
 
-```bash
-cat <<EOF > flake.nix
+```nix
+# flake.nix
 {
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
 
-  outputs = { self, nixpkgs, ... }@attrs:
+  outputs = { self, nixpkgs, ... }:
     let
       system = "x86_64-linux";
-      pkgs = import nixpkgs { inherit system; };
     in
     {
       # test is a hostname for our machine
@@ -20,13 +19,12 @@ cat <<EOF > flake.nix
       };
     };
 }
-EOF
 ```
 
 ## Add your configuration
 
-```bash
-cat <<EOF > configuration.nix
+```nix
+# configuration.nix
 { config, lib, pkgs, ... }: {
   # customize kernel version
   boot.kernelPackages = pkgs.linuxPackages_5_15;
@@ -61,7 +59,6 @@ cat <<EOF > configuration.nix
 
   system.stateVersion = "23.05";
 }
-EOF
 ```
 
 ## Run a VM
@@ -70,8 +67,14 @@ EOF
 git init # skip this step if you are inside already tracked repository
 git add . # flakes requires at least tracking the files
 nixos-rebuild build-vm --flake .#test
+# expose port 22 from guest
 export QEMU_NET_OPTS="hostfwd=tcp::2221-:22"
 result/bin/run-nixos-vm
 ```
 
-## Profit!
+## Profit!
+
+```bash
+# ssh onto the machine
+ssh -oUserKnownHostsFile=/dev/null -oStrictHostKeyChecking=no admin@localhost -p 2221
+```
diff --git a/nix_vm.md b/nix_vm.md
@@ -0,0 +1,77 @@
+## Create simple flake: 
+
+```bash
+cat <<EOF > flake.nix
+{
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+  outputs = { self, nixpkgs, ... }@attrs:
+    let
+      system = "x86_64-linux";
+      pkgs = import nixpkgs { inherit system; };
+    in
+    {
+      # test is a hostname for our machine
+      nixosConfigurations.test = nixpkgs.lib.nixosSystem {
+        inherit system;
+        modules = [
+          ./configuration.nix
+        ];
+      };
+    };
+}
+EOF
+```
+
+## Add your configuration
+
+```bash
+cat <<EOF > configuration.nix
+{ config, lib, pkgs, ... }: {
+  # customize kernel version
+  boot.kernelPackages = pkgs.linuxPackages_5_15;
+
+  users.users = {
+    admin = {
+      isNormalUser = true;
+      extraGroups = [ "wheel" ];
+      password = "admin";
+      group = "admin";
+    };
+  };
+
+  virtualisation.vmVariant = {
+    # following configuration is added only when building VM with build-vm
+    virtualisation = {
+      memorySize = 2048; # Use 2048MiB memory.
+      cores = 3;
+      graphics = false;
+    };
+  };
+
+  services.openssh = {
+    enable = true;
+    settings.PasswordAuthentication = true;
+  };
+
+  networking.firewall.allowedTCPPorts = [ 22 ];
+  environment.systemPackages = with pkgs; [
+    htop
+  ];
+
+  system.stateVersion = "23.05";
+}
+EOF
+```
+
+## Run a VM
+
+```bash
+git init # skip this step if you are inside already tracked repository
+git add . # flakes requires at least tracking the files
+nixos-rebuild build-vm --flake .#test
+export QEMU_NET_OPTS="hostfwd=tcp::2221-:22"
+result/bin/run-nixos-vm
+```
+
+## Profit!