According to fstab(5), unlike last two fields `fs_freq` and `fs_passno`,
the 4-th field `fs_mntops` is NOT optional, though it works when omitted.
For best-practice and easier to be parsed by other programs, we should always
write `defaults` as default mount options for swap devices.
The `networking.hostname` option was changed to not permit periods
in names, due to a strict reading of RFC 1123. For users who need
the hostname to be fully qualified, the networking.hostName option
suggests using boot.kernel.sysctl."kernel.hostname" as a workaround.
This option works correctly at boot time, but every "nixos-rebuild
switch" will change the hostname back to the unqualified version.
This commit brings the activation script in line with the
documentation's recommendation.
This reverts commit d349582c07.
The workaround initially applied isn't necessary anymore, as 247.3
contains the following commit:
> 242fc1d261 network: fix IPv6PrivacyExtensions=kernel handling
… which fixes https://github.com/systemd/systemd/issues/18003.
If the machine is powered off when the zpool-trim timer is supposed to
trigger (usually around midnight) then the timer will be skipped
outright in favor of the next instance.
For desktop systems which are usually powered off at this time, zpool
trimming will never be run which can degrade SSD performance.
By marking the timer as `Persistent = yes` we ensure that it will run at
the first possible opportunity after the trigger date is reached.
We currently build CONFIG_IPV6=m.
This seems to be not really well-supported in mainline kernels - see
https://lore.kernel.org/netdev/20201115224509.2020651-1-flokli@flokli.de/T/#u
Compiling it as a module doesn't give too much benefit - even for people
who did explicitly set `enableIPv6` to false, the `ipv6` module was
still loaded, as soon as another module was loaded that requires it
(bridge,br_netfilter,wireguard,ip6table_mangle,sctp,…).
By compiling it in, we only loose the possibility to not add it to
`boot.kernelModules` anymore (as it's part of the kernel directly). The
space savings are negligible.
People wanting to disable IPv6 still get the appropriate sysctls and
options set (while having the kernel code loaded), nothing is really
changing here.
Systemd dependencies for scripted mode
were refactored according to analysis in #34586.
networking.vswitches can now be used with systemd-networkd,
although they are not supported by the daemon, a nixos receipe
creates the switch and attached required interfaces (just like
the scripted version).
Vlans and internal interfaces are implemented following the
template format i.e. each interface is
described using an attributeSet (vlan and type at the moment).
If vlan is present, then interface is added to the vswitch with
given tag (access mode). Type internal enabled vswitch to create
interfaces (see openvswitch docs).
Added configuration for configuring supported openFlow version on
the vswitch
This commit is a split from the original PR #35127.
