2015-05-27 09:34:50 +02:00
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---
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layout: post
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comments: true
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title: "My systemd-networkd setup"
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category: [english]
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tags: [english, systemd-networkd]
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---
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*This is happy post so probably useless, but my blog is always so
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unhappy… Anyway, systemd-networkd on my hosts.*
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I am running systemd-networkd on wired hosts as I am not so sure how it
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works with wireless hosts and I am using network manager with WLAN
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connections.
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The hosts mentioned here are
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* Zaldaryn which runs Ubuntu MATE 15.04
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* Rbtpzn which currently runs Antergos and is the oldest PC I have and
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it's also the first one ever where I installed Ubuntu 8.04 in 2008.
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First you create network connection, I call them with the adapter name,
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e.g. Rbtpzn has `/etc/systemd/network/enp0s18.network` and Zaldaryn
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`/etc/systemd/network/eth0.network`.
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It appears that I have been experimenting with the two hosts, so the
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files differ. Here is Zaldaryn which looks more proper or direct copy
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from Arch Wiki:
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```
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[Match]
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Name=eth0
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[Network]
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DNS=127.0.0.1
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[Address]
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Address=172.16.1.6
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[Route]
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Gateway=172.16.0.1
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```
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and Rbtpzn
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```
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[Match]
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Name=enp0s18
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[Network]
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Address=172.16.1.2/16
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Gateway=172.16.0.1
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# DNS has no effect unless systemd-resolved is used
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# systemctl enable systemd-resolved && systemctl start systemd-resolved
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# ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf
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DNS=127.0.0.1
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DNS=::1
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DNS=8.8.4.4
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NTP=pool.ntp.org
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```
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As you can see, they are quite different, Zaldaryn has everything neatly
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separated and Rbtpzn has everything in the same block.
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Match specifies which network interface is in question, Address is IP
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address of the host. I am not sure where I took NTP and as the Rbtpzn block
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says, you must use systemd-resolved for the DNS settings to do anything,
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but that is easy, just run as root (or prefix all three commands
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with `sudo`):
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2015-06-07 18:07:26 +02:00
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*update on 2015-06-07: to use NTP, you use systemd-timesyncd which is
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enabled with `timedatectl set-ntp true`.*
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2015-05-27 09:34:50 +02:00
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```
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systemctl enable systemd-resolved && systemctl start systemd-resolved
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ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf
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```
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The address can also have CIDR specified which probably should be done, but
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it appears that systemd-networkd can guess it correctly as everything works
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with Zaldaryn which doesn't have it specified.
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I am also using `systemd-networkd-wait-online.service`
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(`systemctl enable systemd-networkd-wait-online.service`) so
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2015-06-07 10:11:53 +02:00
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`network.target` means that I have IP address before boot continues.
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<s>There is 90 second timeout, but I still don't feel like trying this with wireless host as I would have 90 seconds longer boot time in new
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environments.</s>
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*Update on 2015-06-07: on wireless hosts I am using Network Manager and
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it appears that `NetworkManager-wait-online.service`
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(`systemctl enable NetworkManager-wait-online.service)` works well
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and I shouldn't be in new environments so often that the 90 seconds timeout
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would cause more harm than good.*
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2015-05-27 09:34:50 +02:00
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Currently the only thing using network.target for me is Reflector service
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from Archwiki which updates mirrorlist with the fastest last synced mirrors
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on boot on Rbtpzn.
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Sources/further reading
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* https://wiki.archlinux.org/index.php/Systemd-networkd
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* http://www.freedesktop.org/software/systemd/man/systemd.network.html
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* https://wiki.freedesktop.org/www/Software/systemd/NetworkTarget/
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* https://wiki.archlinux.org/index.php/Reflector#Systemd_Service
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