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Cake day: June 30th, 2023

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  • One thing that makes a project good is knowing what it does, I’ve seen quite a few projects where they talk about all the features and technology and how to configure it but not a word about what it actually does, what problems it solves and so on.

    I won’t self host your program if you don’t even tell me what it does, don’t make me search and clue together large parts of the documentation just to find if I want it. A simple explanation is enough but somehow I’ve seen quite a few programs that don’t have it.






  • Yeah it works great and is very secure but every time I create a new service it’s a lot of copy paste boilerplate, maybe I’ll put most of that into a nix function at some point but until then here’s an example n8n config, as loaded from the main nixos file.

    I wrote this last night for testing purposes and just added comments, the config works but n8n uses sqlite and probably needs some other stuff that I hadn’t had a chance to use yet so keep that in mind.
    Podman support in home-manager is also really new and doesn’t support pods (multiple containers, one loopback) and some other stuff yet, most of it can be compensated with the extraarguments but before this existed I used pure file definitions to write quadlet/systemd configs which was even more boilerplate but also mostly copypasta.

    Gaze into the boilerplate
    { config, pkgs, lib, ... }:
    
    {
        users.users.n8n = {
            # calculate sub{u,g}id using uid
            subUidRanges = [{
                startUid = 100000+65536*( config.users.users.n8n.uid - 999);
                count = 65536;
            }];
            subGidRanges = [{
                startGid = 100000+65536*( config.users.users.n8n.uid - 999);
                count = 65536;
            }];
            isNormalUser = true;
            linger = true; # start user services on system start, fist time start after `nixos-switch` still has to be done manually for some reason though
            openssh.authorizedKeys.keys = config.users.users.root.openssh.authorizedKeys.keys; # allows the ssh keys that can login as root to login as this user too
        };
        home-manager.users.n8n = { pkgs, ... }:
        let
            dir = config.users.users.n8n.home;
            data-dir = "${dir}/${config.users.users.n8n.name}-data"; # defines the path "/home/n8n/n8n-data" using evaluated home paths, could probably remove a lot of redundant n8n definitions....
        in
        {
            home.stateVersion = "24.11";
            systemd.user.tmpfiles.rules =
            let
                folders = [
                    "${data-dir}"
                    #"${data-dir}/data-volume-name-one" 
                ];
                formated_folders = map (folder: "d ${folder} - - - -") folders; # a function that takes a path string and formats it for systemd tmpfiles such that they get created as folders
            in formated_folders;
    
            services.podman = {
                enable = true;
                containers = {
                    n8n-app = { # define a container, service name is "podman-n8n-app.service" in case you need to make multiple containers depend and run after each other
                        image = "docker.n8n.io/n8nio/n8n";
                        ports = [
                            "${config.local.users.users.n8n.listenIp}:${toString config.local.users.users.n8n.listenPort}:5678" # I'm using a self defined option to keep track of all ports and uids in a seperate file, these values just map to "127.0.0.1:30023:5678", a caddy does a reverse proxy there with the same option as the port.
                        ];
                        volumes = [
                            "${data-dir}:/home/node/.n8n" # the folder we created above
                        ];
                        userNS = "keep-id:uid=1000,gid=1000"; # n8n stores files as non-root inside the container so they end up as some high uid outside and the user which runs these containers can't read it because of that. This maps the user 1000 inside the container to the uid of the user that's running podman. Takes a lot of time to generate the podman image for a first run though so make sure systemd doesn't time out
                        environment = {
                            # MYHORSE = "amazing";
                        };
                        # there's also an environmentfile option for secret management, which works with sops if you set the owner of the secret/secret template
                        extraPodmanArgs = [
                            "--pull=newer" # always pull newer images when starting, I could make this declaritive but I haven't found a good way to automagically update the container hashes in my nix config at the push of a button.
                        ];
                     # few more options exist that I didn't need here
                    };
                };
            };
        };
    }
    
    

  • DNS turns a domain name into an IP which can then be used to send data through your router, a dns server is the server which is used to do this conversion (www.google.com turns into an IP 1.2.3.4 (that isn’t the actual IP of google)).

    There are many dns servers, normally your local devices use your router as the dns server, which forwards it to your ISP which they further transfer it over global dns servers.

    Alternatively you could use Google’s DNS server (8.8.8.8) or cloudflares DNS server (1.1.1.1) but if the one on your router works then just use it.

    nameserver is the same as DNS server

    Tldr: set the router IP as your dns server, you only need this one.


  • …that’s the valid response, does ping www.google.com work and curl www.google.com return a bunch of text?

    If ping www.google.com doesn’t work then your system isn’t using the correct dns server, though your local dns server works (as seen by the prior dig).

    If curl works then…you have a working internet connection, maybe check the browser settings for proxy or something.



  • I use podman using home-manager configs, I could run the services natively but currently I have a user for each service that runs the podman containers. This way each service is securely isolated from each other and the rest of the system. Maybe if/when NixOS supports good selinux rules I’ll switch back to running it native.









  • …not really the point, the point is that either you have a nuke (or better) or an explosion isn’t going to be sufficient to destroy Intel and machinery.

    Unless you can justify having a built in nuke/antimatter bomb in the ship then it’s not something a real world ship would have(excluding things like special military ships maybe).

    Even if you have an antimatter reactor then it would still have to be a procedure on the order of “we’re welding the safety’s shut and overriding everything we can give us a few hours to rig the ship to blow” not “whoops pushed the self destruct button”

    Point being, a colony ship or some science exploration vessel doesn’t have a built in antimatter bomb at the push of a button.


  • If you have a second ship then you could use its thrusters.

    I also doubt that any explosion short of nuclear is going to destroy most equipment and intel considering the ship is in space and has large parts vented to space (due to combat damage or design). Maybe if you line or fill all the things you want to destroy with some explosives but I wouldn’t want to be on such a ship. More likely you’d manually lay down explosives from the ammunition if scuttling is required and then detonate it but not have it already there at the push of a button(assuming you’re not using a nuke for every ship).