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network-interfaces service: fix bindsTo deps for masters

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Previously, netdev units for network interfaces defined in the nixos
configurations would bindTo the systemd device unit of the interface if
not in a container.

In situations where you switch to a new nixos configration with changes
to network-setup.service (like nameservers) and have stacked interfaces
like vlans on a bond, it would fail to propagate restarts to the netdevs
correctly resulting with broken networking. The bond would be present
but no vlan interfaces rendering the machine unreachable.

My fear is that the udev events fail to propagate correctly while a systemd
transaction that is also restarting the triggered netdev service is running.
This commit changes this behaviour so netdev services bindTo other netdev
services if present and otherwise fall back to the previous behaviour.

We also noticed that stacked interfaces would sometimes seemingly be stopped
in the wrong order. For instance in the above example, the bond interface
would be deleted before the vlan interfaces resulting in the vlan interfaces
not being present when their service is being stopped. This would cause the
systemd transaction to fail and thus break networking. Their postStop hooks
are now allowed to fail as we have reached the desired state.
This commit is contained in:
Franz Pletz 2017-02-09 23:08:48 +01:00
parent f5a82e4714
commit 76a3c30471
No known key found for this signature in database
GPG key ID: 846FDED7792617B4
1 changed files with 15 additions and 19 deletions
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34
nixos/modules/tasks/network-interfaces-scripted.nix
View file

@ -47,21 +47,17 @@ in
let
deviceDependency = dev:
if (config.boot.isContainer == false)
then
# Trust udev when not in the container
optional (dev != null) (subsystemDevice dev)
else
# When in the container, check whether the interface is built from other definitions
if (hasAttr dev cfg.bridges) ||
(hasAttr dev cfg.bonds) ||
(hasAttr dev cfg.macvlans) ||
(hasAttr dev cfg.sits) ||
(hasAttr dev cfg.vlans) ||
(hasAttr dev cfg.vswitches) ||
(hasAttr dev cfg.wlanInterfaces)
then [ "${dev}-netdev.service" ]
else [];
# Use systemd service if we manage device creation, else
# trust udev when not in a container
if (hasAttr dev cfg.bridges) ||
(hasAttr dev cfg.bonds) ||
(hasAttr dev cfg.macvlans) ||
(hasAttr dev cfg.sits) ||
(hasAttr dev cfg.vlans) ||
(hasAttr dev cfg.vswitches) ||
(hasAttr dev cfg.wlanInterfaces)
then [ "${dev}-netdev.service" ]
else optional (dev != null && !config.boot.isContainer) (subsystemDevice dev);
networkLocalCommands = {
after = [ "network-setup.service" ];
@ -198,7 +194,7 @@ in
user "${i.virtualOwner}"
'';
postStop = ''
ip link del ${i.name}
ip link del ${i.name} || true
'';
};
@ -335,7 +331,7 @@ in
ip link set "${n}" up
'';
postStop = ''
ip link delete "${n}"
ip link delete "${n}" || true
'';
});
@ -363,7 +359,7 @@ in
ip link set "${n}" up
'';
postStop = ''
ip link delete "${n}"
ip link delete "${n}" || true
'';
});
@ -387,7 +383,7 @@ in
ip link set "${n}" up
'';
postStop = ''
ip link delete "${n}"
ip link delete "${n}" || true
'';
});