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+---
+#title: Getting started with remote deployment on NixOs
+title: Remote deployments on NixOs
+description: A quick and dirty guide to get started with building systems to remote instances
+date: 2024-05-04 00:00:00+0000
+image: taylor-vick-M5tzZtFCOfs-unsplash.jpg
+categories:
+ - Nix
+ - Guide
+ - Sysadmin
+
+tags:
+ - Nix
+ - NixOs
+ - Server Management
+
+draft: false
+---
+
+With the capabilities of Nix & Nixos, we can tailor-make services on our local computer,
+build the system, and then transmit it to a remote server using the `--target-host` argument for `nixos-rebuild`
+command. This is an efficient method of deploying services to distant servers because you
+don't have to connect to the machine via SSH and set up the files locally before building
+them there.
+
+## How remote deployments work
+
+
+
+NixOS allows for a seamless build process, where you can create the system on your local computer and then use
+SSH to transfer the configuration files to a remote machine where the services are deployed.
+This process is easy to manage and streamline. Ez to learn!
+
+## Getting started
+
+First you will need a machine running NixOs. Duh. But also you will need to have root access to it in some way.
+If you have the root user and its password then you are set to go and can skip to the section where [I explain how to get ready for remote deployment](#first-boot)
+
+### Setting up NixOs on a server.
+
+#### Installing
+
+I assume if you are reading this article you know how to install an operating system.
+
+You will need to flash an usb drive with NixOs, for the sake of an easy install I will use `latest-nixos-plasma5-x86_64-linux.iso` since It comes with a fearly easy to use Calamares installer.
+
+
+You can go ahead and click through it and it will install.
+
+## First boot
+
+For remote deployment to work you will need to enable ssh and configure some parameters for it to work.
+We are enabling root login and also sftp for file transfer.
+
+```nix
+# configuration.nix
+ services.openssh = {
+ enable = true;
+ allowSFTP = true;
+ settings = {
+ PasswordAuthentication = true;
+ PermitRootLogin = "yes";
+ };
+ };
+ networking.hostName = "server1";
+ networking.domain = "localhost";
+```
+
+**Rebuild the system**
+
+```zsh
+sudo nixos-rebuild switch
+```
+
+## Setting up key auth
+
+To facilitate easy deployments, you can transfer your public SSH key to the remote machine, allowing you to log
+in without having to enter the password for each rebuild. This method is both more convenient and safe
+
+```bash
+ssh-copy-id root@server
+```
+
+## Create a directory for the remote
+
+On your local machine, it's important to organize your files into a directory, particularly when working with
+multiple servers. This is demonstrated below, where I showcase my personal file
+organization method.
+
+{{< filetree/container >}}
+{{< filetree/folder name="servers" >}}
+
+{{< filetree/folder name="server1" state="closed" >}}
+{{< filetree/file name="configuration.nix" >}}
+{{< filetree/file name="flake.nix" >}}
+{{< filetree/file name="flake.lock" >}}
+{{< /filetree/folder >}}
+
+{{< filetree/folder name="server2" state="closed" >}}
+{{< filetree/file name="configuration.nix" >}}
+{{< filetree/folder name="services" state="closed" >}}
+{{< filetree/file name="matrix.nix" >}}
+{{< filetree/file name="webserver.nix" >}}
+{{< /filetree/folder >}}
+{{< filetree/file name="flake.nix" >}}
+{{< filetree/file name="flake.lock" >}}
+{{< /filetree/folder >}}
+{{< /filetree/folder >}}
+
+{{< /filetree/container >}}
+
+## Copying essential files from remote
+
+NixOS does not support partial builds, so you will need to transfer all the necessary files from `/etc/nixos` to
+your local machine. This includes files such as `hardware-configuration.nix` and `configuration.nix`.
+
+```bash
+scp configuration.nix root@server:/etc/nixos
+```
+
+```bash
+scp hardware-configuration.nix root@server:/etc/nixos
+```
+
+## Create flakes
+
+You can create a file called `flake.nix` or use `nix` to do so.
+
+```bash
+nix flake init .
+```
+
+Paste the following in the file.
+
+```nix
+# flake.nix
+{
+ description = "Server1 deployments";
+
+ inputs = {
+ nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
+ };
+
+ outputs =
+ { self
+ , nixpkgs
+ , ...
+ }:
+ let
+ system = "x86_64-linux";
+ in
+ {
+ nixosConfigurations.server1 = nixpkgs.lib.nixosSystem {
+ inherit system;
+ modules = [
+ ./configuration.nix
+ ];
+ };
+ };
+}
+```
+
+Here is an example of how your `configuration.nix` should look like.
+
+```nix
+# configuration.nix
+
+{ config, pkgs, ... }:
+
+{
+ imports =
+ [
+ ./hardware-configuration.nix
+ ];
+
+ networking.hostName = "server1";
+ networking.domain = "example.com";
+
+ services.openssh = {
+ enable = true;
+ allowSFTP = true;
+ settings = {
+ PasswordAuthentication = true;
+ PermitRootLogin = "yes";
+ };
+ };
+
+}
+
+
+```
+
+## Set up a service
+
+This little example shows a dummy nginx service.
+
+```nix
+# nginx.nix
+services.nginx = {
+ enable = true;
+ virtualHosts = {
+ "example.com" = {
+ locations."/" = {
+ # ...
+ };
+ };
+ };
+}
+```
+
+Insert it in the configuration.nix `imports` section.
+
+```nix
+imports = [
+ ./hardware-configuration.nix
+ ./nginx.nix
+ ];
+```
+
+## Deploy!
+
+After all this we can just go ahead and execute a rebuild like we would do on our local machine. Except in this case we have to add the `--flake` to the rebuild command and also add the hostname we are building for.
+
+```bash
+nixos-rebuild switch --flake .#server1 --target-host root@server --show-trace
+```
+
+## Service management
+
+Since NixOs uses systemd we can utilize its tools such as `journalctl` or `systemcl` to check up on how our services are doing.
+Here are a few commands I recommend using
+
+Prints the last 100 logs of nginx
+
+```bash
+journalctl -u nginx.service -n 200
+```
+
+Displays the status of the service
+
+```bash
+systemctl status nginx.service
+```
+
+## Afterthoughts
+
+The first-boot section could be skipped if you [create a custom nixos installation media](https://wiki.nixos.org/wiki/Creating_a_NixOS_live_CD) then flash that to the server. With a custom media you can define ssh to already have these options enabled and also can add your public key.
+This is how I've been doing my deployments for the past 1 month for the 4 of my servers. It's much easier than my old-school method of ssh-ing into my alpine machines and manage my deployments with `docker-compose`
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diff --git a/content/post/guides/nix/setting-up-a-hugo-site-using-nix/index.en.md b/content/post/guides/nix/setting-up-a-hugo-site-using-nix/index.en.md
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categories:
- Nix
- Guide
+ - Sysadmin
tags:
- Nix
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categories:
- Blog
- Guide
+ - Sysadmin
tags:
- Nix
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