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#1 2023-06-30 07:53:39

lz3060
Member
Registered: 2006-09-15
Posts: 35

[SOLVED] systemd-networkd-wait-online doesn't wait for enp2s0?

Hi,

This one is probably trivial, but here goes: I'm using systemd-networkd on a headless UDOO x86 board, with a single `/etc/systemd/network/20-wired.network`:

[Match]
Name=enp2s0

[Network]
DHCP=yes
Address=192.168.42.19/24
Gateway=192.168.42.1
DNS=192.168.42.1

I try to mount an nfs share with a line in `/etc/fstab`, and I want the mount to happen as soon as the network is available, not "automount" where it gets mounted when accessed, so I try:

192.168.42.13:/frigate	/mnt/frigate	nfs		defaults,auto,noatime,vers=4,retrans=5,_netdev	0 0

With this setup, the mount is attempted before the wired network is actually up, visible in the system journal -- `systemd-networkd-wait-online.service` completes before the adapter gets a carrier!

Using `x-systemd.automount` works, but I wish I knew why systemd-networkd claims `network-online.target` has been reached, while in reality it has not? Do I need a `.link` file explicitly?

Last edited by lz3060 (2023-07-03 21:09:40)

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#2 2023-06-30 13:51:41

seth
Member
Registered: 2012-09-03
Posts: 48,540

Re: [SOLVED] systemd-networkd-wait-online doesn't wait for enp2s0?

https://man.archlinux.org/man/core/syst … nline.8.en

Here, online means that the link's operational state is equal or higher than "degraded". The threshold can be configured by --operational-state= option.

https://man.archlinux.org/man/networkctl.1.en

degraded
the link has carrier and addresses valid on the local link configured

routable
the link has carrier and routable address configured

Edit:
https://bbs.archlinux.org/viewtopic.php?id=284361

Last edited by seth (2023-06-30 13:54:49)

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#3 2023-06-30 15:28:41

nl6720
The Evil Wiki Admin
Registered: 2016-07-02
Posts: 579

Re: [SOLVED] systemd-networkd-wait-online doesn't wait for enp2s0?

It would be great if someone documented this in https://wiki.archlinux.org/title/system … ait-online.

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#4 2023-07-03 21:09:16

lz3060
Member
Registered: 2006-09-15
Posts: 35

Re: [SOLVED] systemd-networkd-wait-online doesn't wait for enp2s0?

Ugh. I went through the wiki and most of the man pages, but I still fail to figure out why a link without a carrier would be considered anything but "offline". My journal clearly shows that the link gets carrier *after* network-online.target is reached. I would put some text in the wiki, if only I could grasp it.

Considered an overlay on the `systemd-networkd-wait-online.service` which sets a higher min `--operational-state=`, but then again ... x-systemd-automount appears to work for me, and plays nicely with docker compose, contrary to what @GuantoApril says in the linked thread.

Thanks, @seth! Marking as solved, but with a bitter aftertaste.

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#5 2023-07-03 21:56:09

seth
Member
Registered: 2012-09-03
Posts: 48,540

Re: [SOLVED] systemd-networkd-wait-online doesn't wait for enp2s0?

My journal clearly shows that the link gets carrier *after* network-online.target is reached.

* Messages might be async/out of order
* Multiple NICs? (only one need to be "online" for this to fire)

I still fail to figure out why a link without a carrier would be considered anything but "offline"

It's not supposed to, but it will before you get a lease (which is not the same and the usual dhcp timeout is like 45s or so)
The NM wait-online thing used to (does?) the same by poassing -s to nm-online, https://man.archlinux.org/man/nm-online.1.en#OPTIONS
There's a lot of concern about timeouts and delaying the boot process and I guess those defaults are a testament to the network-online.target being used too broadly (eg. a non-global wifi connection would not become "online" before the graphical target - what's a problem if the displaymanager service depends on that…) but therefore also render it meaningless.

Either way, we should probably have this confirmed before advertising it in the wiki.

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