Unable to get dummy interfaces to persist across reboots in CentOS 8

Issues related to configuring your network
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dfjkl
Posts: 13
Joined: 2010/12/27 07:50:34

Unable to get dummy interfaces to persist across reboots in CentOS 8

Post by dfjkl » 2020/10/16 14:05:08

Hoping someone has an idea what's up here.

I cannot get dummy interfaces on a new Cent8 build to persist across reboots.

On Cent7 - this is the process I use:

Code: Select all

Create Dummies:
# cat /etc/modules-load.d/dummy.conf
dummy
# cat /etc/modprobe.d/dummyopts.conf
options dummy numdummies=4
# ip link add dummy0 type dummy
## - repeating w/ ascending dummyN adapters for as many needed
# service network start
# dracut -f
I've got a Cent8 box setup the same way, I'm able to create the dummy adapters just fine, but upon reboot, they are all missing.

dfjkl
Posts: 13
Joined: 2010/12/27 07:50:34

Re: Unable to get dummy interfaces to persist across reboots in CentOS 8

Post by dfjkl » 2020/10/22 11:34:29

bump

dfjkl
Posts: 13
Joined: 2010/12/27 07:50:34

Re: Unable to get dummy interfaces to persist across reboots in CentOS 8

Post by dfjkl » 2020/10/27 00:39:55

Anyone?

dfjkl
Posts: 13
Joined: 2010/12/27 07:50:34

Re: Unable to get dummy interfaces to persist across reboots in CentOS 8

Post by dfjkl » 2020/11/15 02:15:04

A colleague actually figured this out.

There is an entry in /lib/modprobe.d/systemd.conf that seems to
override any other user configurations applied.

options dummy numdummies=0

...needs to be removed from this file (or at least modified, but since
my configuration already lays that down in /etc/modprobe.d this just
needs to be removed for my purposes).

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