Great!

Thank you!

From: Ales Musil <amusil@redhat.com>
Sent: Tuesday, August 24, 2021 7:00 PM
To: Tommy Sway <sz_cuitao@163.com>
Cc: users <users@ovirt.org>
Subject: Re: [ovirt-users] about the network name rules on CentOS/Redhat 8 and the cloud-init network interface name

On Tue, Aug 24, 2021 at 12:59 PM Ales Musil <amusil@redhat.com> wrote:

On Tue, Aug 24, 2021 at 11:17 AM Tommy Sway <sz_cuitao@163.com> wrote:

Everybody is good!

As you all know, to use the client's network card name in cloud-init, you must fill in the exact name of the network card interface.

This was easy in version 7 and before, which usually started with EN0.

After version 8, however, the naming conventions for network cards changed a lot. In my own test environment, for example, I started with ENS3.

I'm not sure what naming convention it uses, which would make it impossible to specify nic information using cloud-init.

Could you help me explain how to deal with this problem?

Thank you very much!

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Hi,

this is called Predictable Network Names and it is the default policy for net interface naming in el8. There are a couple tricks you can do to mitigate that,

you can disable it, or predict the name based on your configuration PCI slot etc [0]. There is a documentation for RHEL that explains it [1].

There is also another option and that's using a custom udev rule to assign whatever name you want based on some identifiers like MAC, PCI addr etc.

Hopefully this helps.

Best regards,

Ales

Forgot the links:

[0] https://www.freedesktop.org/software/systemd/man/systemd.net-naming-scheme.html

[1] https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_networking/consistent-network-interface-device-naming_configuring-and-managing-networking

--

Ales Musil

Software Engineer - RHV Network

Red Hat EMEA

amusil@redhat.com    IM: amusil

--

Ales Musil

Software Engineer - RHV Network

Red Hat EMEA

amusil@redhat.com    IM: amusil