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nixos/systemd: add options for hardware watchdog management

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This commit is contained in:
Matt Layher 2020-07-08 21:43:12 -04:00
parent cb330dafd5
commit f9ea9c7299
2 changed files with 74 additions and 0 deletions
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52
nixos/modules/system/boot/systemd.nix
View file

@ -818,6 +818,45 @@ in
'';
};
systemd.watchdog.device = mkOption {
type = types.path;
example = "/dev/watchdog";
description = ''
The path to a hardware watchdog device which will be managed by systemd.
If not specified, systemd will default to /dev/watchdog.
'';
};
systemd.watchdog.runtimeTime = mkOption {
type = types.str;
example = "30s";
description = ''
The amount of time which can elapse before a watchdog hardware device
will automatically reboot the system. Valid time units include "ms",
"s", "min", "h", "d", and "w".
'';
};
systemd.watchdog.rebootTime = mkOption {
type = types.str;
example = "10m";
description = ''
The amount of time which can elapse after a reboot has been triggered
before a watchdog hardware device will automatically reboot the system.
Valid time units include "ms", "s", "min", "h", "d", and "w".
'';
};
systemd.watchdog.kexecTime = mkOption {
type = types.str;
example = "10m";
description = ''
The amount of time which can elapse when kexec is being executed before
a watchdog hardware device will automatically reboot the system. This
option should only be enabled if reloadTime is also enabled. Valid
time units include "ms", "s", "min", "h", "d", and "w".
'';
};
};
@ -889,6 +928,19 @@ in
DefaultIPAccounting=yes
''}
DefaultLimitCORE=infinity
${optionalString (config.systemd.watchdog.device != "") ''
WatchdogDevice=${config.systemd.watchdog.device}
''}
${optionalString (config.systemd.watchdog.runtimeTime != "") ''
RuntimeWatchdogSec=${config.systemd.watchdog.runtimeTime}
''}
${optionalString (config.systemd.watchdog.rebootTime != "") ''
RebootWatchdogSec=${config.systemd.watchdog.rebootTime}
''}
${optionalString (config.systemd.watchdog.kexecTime != "") ''
KExecWatchdogSec=${config.systemd.watchdog.kexecTime}
''}
${config.systemd.extraConfig}
'';

22
nixos/tests/systemd.nix
View file

@ -50,6 +50,13 @@ import ./make-test-python.nix ({ pkgs, ... }: {
fi
'';
};
systemd.watchdog = {
device = "/dev/watchdog";
runtimeTime = "30s";
rebootTime = "10min";
kexecTime = "5min";
};
};
testScript = ''
@ -117,5 +124,20 @@ import ./make-test-python.nix ({ pkgs, ... }: {
retcode, output = machine.execute("systemctl status testservice1.service")
assert retcode in [0, 3] # https://bugs.freedesktop.org/show_bug.cgi?id=77507
assert "CPU:" in output
# Test systemd is configured to manage a watchdog
with subtest("systemd manages hardware watchdog"):
machine.wait_for_unit("multi-user.target")
# It seems that the device's path doesn't appear in 'systemctl show' so
# check it separately.
assert "WatchdogDevice=/dev/watchdog" in machine.succeed(
"cat /etc/systemd/system.conf"
)
output = machine.succeed("systemctl show | grep Watchdog")
assert "RuntimeWatchdogUSec=30s" in output
assert "RebootWatchdogUSec=10m" in output
assert "KExecWatchdogUSec=5m" in output
'';
})