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--- navody:distribuce:nixos [2017/05/29 20:06] – vytvořeno rmarko
+++ navody:distribuce:nixos [2017/10/31 08:48] – [Common issues] ssh, systemd232/233 rmarko
@@ Řádek 20: / Řádek 20: @@
 Consult NixOS manual for more https://nixos.org/nixos/manual/
+==== 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 ===
+Nix ≥ 1.11.10 requires seccomp, which is not available on vpsFree. To fix this, pin Nix to 1.11.9 by adding the following option to ''configuration.nix'' and rebuilding the system:
+<code>
+    nix.package = (import (pkgs.fetchFromGitHub {
+	owner = "NixOS";
+	repo = "nixpkgs";
+	rev = "300fa462b31ad2106d37fcdb4b504ec60dfd62aa";
+	sha256 = "1cbjmi34ll5xa2nafz0jlsciivj62mq78qr3zl4skgdk6scl328s";
+    }) {}).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
+$ # strace output
+open("/etc/systemd/system/local-fs.target", O_RDONLY|O_NOCTTY|O_NOFOLLOW|O_CLOEXEC) = -1 ELOOP (Too many levels of symbolic links)
+readlinkat(AT_FDCWD, "/etc/systemd/system/local-fs.target", "/nix/store/n5ksbh1hx275zfbqbalhg"..., 99) = 94
+open("/nix/store/n5ksbh1hx275zfbqbalhghzpxp1w73lf-systemd-234/example/systemd/system/local-fs.target", O_RDONLY|O_NOCTTY|O_NOFOLLOW|O_CLOEXEC) = 12
+fcntl(12, F_GETFL)              = 0xa8000 (flags O_RDONLY|O_LARGEFILE|O_NOFOLLOW|O_CLOEXEC)
+fstat(12, {st_mode=S_IFREG|0444, st_size=507, ...}) = 0
+fstat(12, {st_mode=S_IFREG|0444, st_size=507, ...}) = 0
+getpid()                        = 1
+fstat(12, {st_mode=S_IFREG|0444, st_size=507, ...}) = 0
+read(12, "#  This file is part of systemd."..., 512) = 507
+open("/dev/urandom", O_RDONLY|O_NOCTTY|O_CLOEXEC) = 13
+read(13, "\26\265jV\260\276\7\3300\22J\264m~j\37", 16) = 16
+close(13)                       = 0
+read(12, "", 512)               = 0
+close(12)                       = 0
+open("/", O_RDONLY|O_NOFOLLOW|O_CLOEXEC|0x200000) = 12
+openat(12, "etc", O_RDONLY|O_NOFOLLOW|O_CLOEXEC|0x200000) = 13
+fstat(13, {st_mode=S_IFDIR|0755, st_size=50, ...}) = 0
+close(12)                       = 0
+openat(13, "systemd", O_RDONLY|O_NOFOLLOW|O_CLOEXEC|0x200000) = 12
+fstat(12, {st_mode=S_IFDIR|0755, st_size=10, ...}) = 0
+close(13)                       = 0
+openat(12, "system", O_RDONLY|O_NOFOLLOW|O_CLOEXEC|0x200000) = -1 ELOOP (Too many levels of symbolic links)
+close(12)                       = 0
+writev(3, [{"Failed to canonicalize path /etc"..., 104}, {"\n", 1}], 2) = 105
+open("/", O_RDONLY|O_NOFOLLOW|O_CLOEXEC|0x200000) = 12
+openat(12, "etc", O_RDONLY|O_NOFOLLOW|O_CLOEXEC|0x200000) = 13
+fstat(13, {st_mode=S_IFDIR|0755, st_size=50, ...}) = 0
+close(12)                       = 0
+openat(13, "systemd", O_RDONLY|O_NOFOLLOW|O_CLOEXEC|0x200000) = 12
+fstat(12, {st_mode=S_IFDIR|0755, st_size=10, ...}) = 0
+close(13)                       = 0
+openat(12, "system", O_RDONLY|O_NOFOLLOW|O_CLOEXEC|0x200000) = -1 ELOOP (Too many levels of symbolic links)
+close(12)                       = 0
+writev(3, [{"Failed to canonicalize path /etc"..., 100}, {"\n", 1}], 2) = 101
+open("/etc/systemd/system/emergency.target", O_RDONLY|O_NOCTTY|O_NOFOLLOW|O_CLOEXEC) = -1 ELOOP (Too many levels of symbolic links)
+readlinkat(AT_FDCWD, "/etc/systemd/system/emergency.target", "/nix/store/n5ksbh1hx275zfbqbalhg"..., 99) = 95
+open("/nix/store/n5ksbh1hx275zfbqbalhghzpxp1w73lf-systemd-234/example/systemd/system/emergency.target", O_RDONLY|O_NOCTTY|O_NOFOLLOW|O_CLOEXEC) = 12
+fcntl(12, F_GETFL)              = 0xa8000 (flags O_RDONLY|O_LARGEFILE|O_NOFOLLOW|O_CLOEXEC
+</code>

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