Running at a low priority is generally bad since it runs the risk of
priority inversions, etc. It's really the builders that should run
under a different priority (e.g. in their own cgroup).
This is to use the VMs own disk image instead of a tmpfs in order to
avoid eating more memory. Of course, by default we still use the tmpfs
in order to not break existing VM tests.
I personally don't like the coding style of the option definition, but
in order to stay consistent, I followed the overall style in this file.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Extend the buildMachines option to support specification of
supportedFeatures and mandatoryFeatures in order to support all
configuration options of the nix.machines file.
Unfortunately, the flag only works directly and without the daemon, so
this adds an extra variable $repair, to avoid the daemon. This is to
avoid to iterate through the $extraBuildFlags just to test whether
"--repair" exists.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
It used to be set to 7 (debug) so you get lots of crap on the console.
The new value of 4 is also what Ubuntu uses. Red Hat uses 3.
A nice side effect is that it's more likely that the LUKS passphrase
prompt doesn't get clobbered by kernel log messages.
Ensure permission bits are (re)set on each system activation with
explicit chmod call.
mkdir -m MODE PATH will only set the permission bits if PATH is
*created*, which means users that have old NixOS versions will continue
to have the old 700 permissions on /var/log/journal until they chmod
manually. With this commit the permissions will be set to 755 on system
activation.
When apcupsd has initiated a shutdown, systemd always ends up waiting
for it to stop ("A stop job is running for UPS daemon"). This is weird,
because in the journal one can clearly see that apcupsd has received the
SIGTERM signal and has already quit (or so it seems). This reduces the
wait time from 90 seconds (default) to just 5. Then systemd kills it
with SIGKILL.
This adds a special systemd service that calls "apcupsd --killpower"
(put UPS in hibernate mode) just before shutting down the system.
Without this command, the UPS will stay on until the battery is
completely empty.
Each attribute in this option should name an apcupsd event and the
string value it contains will be executed in a shell in response to that
event. See "man apccontrol" for the list of events and what they
represent.
Now it is easy to hook into the apcupsd event system:
services.apcupsd.hooks = {
onbattery = ''# shell commands to run when the onbattery event is emitted'';
doshutdown = ''# shell commands to notify that the computer is shutting down'';
};
This option allows administrators to add verbatim text to the generated
config file. I use this feature, for instance, to disable the default
route normally added by dhcpcd for certain interfaces.
This makes the system journal readable by users in the
systemd-journal, wheel and adm groups. It also allows users to read
their own journals.
Note that this doesn't change the permissions of existing journals.
apcupsd is a daemon for controlling APC UPSes. It is very simple to
configure. If you have an USB based UPS, the default settings should be
useable without further adjustments:
services.apcupsd.enable = true;
This will give you autodetection of USB UPSes, network access limited to
localhost (for security) and the shutdown sequence will be started when
the system when the battery level is below 50 percent, or when the UPS
has calculated that it has 5 minutes or less of remaining power-on time.
You can provide your own configuration file contents with this option:
services.apcupsd.configText = "contents of apcupsd.conf";
Bug/annoyance 1: When apcupsd calls "wall" (on powerfail etc. events),
it prints an error message because stdout is not connected to a tty (it
is connected to the journal):
wall: cannot get tty name: Inappropriate ioctl for device
The message still gets through though, to ctrl-alt-f[1-6] terminals.
Bug/annoyance 2: apcupsd tries to call "mail" (on powerfail etc.
events), and that fails because I'm not passing in any mail program at
the moment (because that would require more configuration options). A
solution to this would be to simply let the user fully configure the
apcupsd event handling logic in nix.
This is in preparation of making a stable release/branch. The version
number is <YY>.<MM>, Ubuntu style, denoting the intended release
year/month. It also has a release codename ("Aardvark").
The README of nfs-utils explains that we must not notify clients
before nfsd is running, otherwise they may fail to reclaim their
locks. OTOH it's allowed but not required to start "rpc.statd
--no-notify" before nfsd. So for simplicity we do both after starting
nfsd.
Turns out that remote-fs-pre.target is not actually "wanted" anywhere,
so statd is not started before remote filesystems are mounted. But
remote filesystems do "want" network-online.target, so we can use that
to pull in statd and idmapd.
Not sure if this is really the right thing to do, but it works for
now. Background:
https://bugzilla.redhat.com/show_bug.cgi?id=787314http://hydra.nixos.org/build/5542230
When nixos-rebuild grabs a new kernel, it will build new spl/zfs
modules, which will change the service. On completion nixos will try and
restart the services which will try and import pools again, and
generally will fail.
The pools are already imported, we don't need to do it again..
Just like in the MySQL service module it really makes sense to provide a
way to inject SQL on the first start of the database cluster.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
This should integrate the logging more tightly into systemd, so for
example "systemctl status mysql" actually gives an overview about what's
actually going on.
This removes the logError option attribute, so in case you still want to
write into a logfile, I've introduced an option called extraOptions, so
you can use something like:
services.mysql*.extraOptions = ''
log-error = /var/log/mysql_err.log
'';
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Grub uses mdadm to find out the device it is on, especially when mdadm itself
resides in a separate boot partition. When bootstrapping from a NixOS
installation CD, it's not a big issue because usually the paths from the Nix
store of the installation CD are matching with the ones in the chrooted
environment.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
