nixpkgs/nixos
Ricardo M. Correia e9affb4274 nixos: Add system-wide option to set the hostid
The old boot.spl.hostid option was not working correctly due to an
upstream bug.

Instead, now we will create the /etc/hostid file so that all applications
(including the ZFS kernel modules, ZFS user-space applications and other
unrelated programs) pick-up the same system-wide host id. Note that glibc
(and by extension, the `hostid` program) also respect the host id configured in
/etc/hostid, if it exists.

The hostid option is now mandatory when using ZFS because otherwise, ZFS will
require you to force-import your ZFS pools if you want to use them, which is
undesirable because it disables some of the checks that ZFS does to make sure it
is safe to import a ZFS pool.

The /etc/hostid file must also exist when booting the initrd, before the SPL
kernel module is loaded, so that ZFS picks up the hostid correctly.

The complexity in creating the /etc/hostid file is due to having to
write the host ID as a 32-bit binary value, taking into account the
endianness of the machine, while using only shell commands and/or simple
utilities (to avoid exploding the size of the initrd).
2014-11-12 22:31:49 +01:00
..
doc/manual apache-httpd: Make 2.4 the default 2014-11-06 14:55:44 +01:00
gui Move all of NixOS to nixos/ in preparation of the repository merge 2013-10-10 13:28:20 +02:00
lib Revert "nixos: iso-image: use syslinux bootloader for USB booting support" 2014-11-08 14:33:27 +01:00
maintainers Refactor EC2 image generation script. Now uses same procedure for both hvm and pv-grub 2014-10-27 11:48:43 +01:00
modules nixos: Add system-wide option to set the hostid 2014-11-12 22:31:49 +01:00
tests cjdns: service tweaks, new NixOS test 2014-11-08 23:39:02 +01:00
COPYING Move all of NixOS to nixos/ in preparation of the repository merge 2013-10-10 13:28:20 +02:00
default.nix Fix nixos-option 2013-10-28 22:45:58 +01:00
README Move all of NixOS to nixos/ in preparation of the repository merge 2013-10-10 13:28:20 +02:00
release-combined.nix Ditch efi installer tests 2014-10-07 12:20:56 -04:00
release-small.nix Add nodejs to the small channel 2014-10-27 10:40:49 +01:00
release.nix cjdns: service tweaks, new NixOS test 2014-11-08 23:39:02 +01:00

*** NixOS ***

NixOS is a Linux distribution based on the purely functional package
management system Nix.  More information can be found at
http://nixos.org/nixos and in the manual in doc/manual.