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--- navody:distribuce:nixos [2017/10/14 03:04] – mention future seccomp config option jtojnar
+++ navody:distribuce:nixos [2018/10/27 10:29] – use vpsAdminOS template, mark openvz template as unsupported rmarko
@@ Řádek 1: / Řádek 1: @@
 ===== NixOS =====
-NixOS template is available based on NixOS 17.03. NixOS allows declarative configuration management of the whole system and deployed services.
+NixOS allows declarative configuration management of the whole system and deployed services.
+To start using NixOS choose **[vpsAdminOS] NixOS** template.
+If you have set your public SSH keys in vpsAdmin the key will be automatically deployed and you can login as root right away. To be able to login with a password you need to set the password manually after your container is created.
 ==== Configuration ====
@@ Řádek 8: / Řádek 12: @@
 This can be altered to change container configuration on the fly or for next reboot. Try changing container hostname and running <code>nixos-rebuild switch</code> to build new configuration and directly switch to it. To switch to new configuration after reboot (set as a default boot profile) use <code>nixos-rebuild boot</code>
+If you are using channels you can update your system by running <code>nixos-rebuild switch --upgrade</code>
 ==== Package installation ====
@@ Řádek 20: / Řádek 26: @@
 Consult NixOS manual for more https://nixos.org/nixos/manual/
+===== Legacy OpenVZ templates =====
+<note important>Due to compatibility issues with OpenVZ it is no longer recommended to use the old infrastructure for new deployments.</note>
 ==== Common issues ====
+=== SSH public key deployment fails ===
+This can occur on first boot of the template when there's no ''/root'' yet. Disable automatic key deployment and deploy key manually **after** the containers boot.
 === error: while setting up the build environment: unable to load seccomp BPF program: Invalid argument ===
@@ Řádek 28: / Řádek 43: @@
 <code>
-nix.package = (import (pkgs.fetchFromGitHub {
+    nix.package = (import (pkgs.fetchFromGitHub {
 	owner = "NixOS";
 	repo = "nixpkgs";
 	rev = "300fa462b31ad2106d37fcdb4b504ec60dfd62aa";
 	sha256 = "1cbjmi34ll5xa2nafz0jlsciivj62mq78qr3zl4skgdk6scl328s";
-}) {}).nix;
+    }) {}).nix;
 </code>
 In the future, it will be possible to [[https://github.com/NixOS/nix/commit/1dd29d7aebae706f3e90a18bbfae727f2ed03c70|disable seccomp usage]].
+=== systemd 233+ compatibility issues ===
+Causes boot failures, workaround is pinning systemd to version 232:
+<code>
+    nixpkgs.config.packageOverrides = super:
+	let systemdGperfCompat = super.systemd.override { gperf = super.gperf_3_0; };
+	in {
+          systemd = systemdGperfCompat.overrideAttrs ( oldAttrs: rec {
+            version = "232";
+            name = "systemd-${version}";
+            src = pkgs.fetchFromGitHub {
+              owner = "nixos";
+              repo = "systemd";
+              rev = "66e778e851440fde7f20cff0c24d23538144be8d";
+              sha256 = "1valz8v2q4cj0ipz2b6mh5p0rjxpy3m88gg9xa2rcc4gcmscndzk";
+            };
+          });
+    };
+</code>
+==== Details ====
+Log contents
+<code>
+Failed to canonicalize path /etc/systemd/system/local-fs.target.d: Too many levels of symbolic links
+$ journalctl -o verbose
+    _EXE=/nix/store/n5ksbh1hx275zfbqbalhghzpxp1w73lf-systemd-234/lib/systemd/systemd
+    _CMDLINE=/run/current-system/systemd/lib/systemd/systemd --system --deserialize 19
+    CODE_FILE=src/shared/dropin.c
+    CODE_LINE=133
+    CODE_FUNC=unit_file_find_dir
+    ERRNO=40
+    MESSAGE=Failed to canonicalize path /etc/systemd/system/local-fs.target.d: Too many levels of symbolic links

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