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[systemd] Force network to wait for DHCP
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wichtounet
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Joined: 17 Mar 2012
Posts: 114

PostPosted: Thu Sep 25, 2014 5:20 pm    Post subject: [systemd] Force network to wait for DHCP Reply with quote

Hi,

I'm using systemd-networkd to configure my interfaces:

Code:
[Match]
Name=enp3s0

[Network]
DHCP=v4


It works quite well except that at boot, some services are not waiting for DHCP to finish. For instances my NFS-mounted directories and nginx fail because there is no network at the time they boot.

Is there a way to force systemd-networkd to wait for DHCP or another target to wait for in the other service files ?

Thanks
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charles17
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Joined: 02 Mar 2008
Posts: 2583

PostPosted: Fri Sep 26, 2014 5:38 am    Post subject: Reply with quote

No idea if it would help solving your problem, as I am not too familiar with systemd.
For dhcpcd with OpenRC I've created an article on https://wiki.gentoo.org/wiki/Network_management_using_DHCPCD and I think a similar solution should be possible also for systemd.

If so, you might possibly be able to go completely without systemd-networkd?
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wichtounet
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Joined: 17 Mar 2012
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PostPosted: Wed Oct 01, 2014 6:52 am    Post subject: Reply with quote

charles17 wrote:
No idea if it would help solving your problem, as I am not too familiar with systemd.
For dhcpcd with OpenRC I've created an article on https://wiki.gentoo.org/wiki/Network_management_using_DHCPCD and I think a similar solution should be possible also for systemd.

If so, you might possibly be able to go completely without systemd-networkd?


Thanks, but that doesn't really help. I would like to avoid using another DHCP client. The network works, but it just doesn't wait for DHCP.

I've seen now that services should wait for

{After,Wants}=network-online.target

but what about NFS mount for instance ?
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UberLord
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Joined: 18 Sep 2003
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PostPosted: Wed Oct 01, 2014 7:01 am    Post subject: Reply with quote

systemd has a something-wait-online service you can use.
_________________
Use dhcpcd for all your automated network configuration needs
Use dhcpcd-ui (GTK+/Qt) as your System Tray Network tool
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wichtounet
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Joined: 17 Mar 2012
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PostPosted: Wed Oct 01, 2014 3:34 pm    Post subject: Reply with quote

UberLord wrote:
systemd has a something-wait-online service you can use.


Yes, I saw that.

I tried to override sshd.service with a sshd.service.d folder and add Wants/After=network-online.target, but the result is the same, it doesn't wait for dhcp to obtain an address. network is marked as online directly when network-online starts :(
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wichtounet
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PostPosted: Wed Oct 01, 2014 4:09 pm    Post subject: Reply with quote

I found a solution :)

There is systemd-networkd-wait-online service that can be enabled and that will cause network-online to wait. Without that, network-online.target seems to be useless.

Moreover, there seems to be a problem in systemd-215, cause I had to upgrade to systemd-216 for this to work. Now, I have overriden all the necessary service files and targets and everything works :)
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