Re: How to avoid systemd/udev unpredictable NIC names
On Mon, Aug 30, 2021 at 10:20:46PM +0200, Steve Keller wrote:
> I plan to upgrade a server from Debian stretch to buster. Having read
> the release notes I wonder what's the best way to avoid the new scheme
> of unpredictable network interface names.
You say "server", so I'm guessing it has more than one NIC. That means
the old way (net.ifnames=0) is not viable.
Your best strategy is to create systemd.link(5) files, and give the NICs
the names you want them to have, based on their MAC addresses.
For example:
unicorn:~$ cat /etc/systemd/network/10-lan0.link
[Match]
MACAddress=18:60:24:77:5c:ec
[Link]
Name=lan0
unicorn:~$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: lan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
link/ether 18:60:24:77:5c:ec brd ff:ff:ff:ff:ff:ff
This is also viable on a single-NIC machine (like mine), but in that
case net.ifnames=0 would also suffice.
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