How does the predictable naming conventions work in VMs? I see they always
differ slightly.

Are we not using a pool of expected syntax like 1/2/3 ??? Or is it built on
things like mb.vendor, # nics, and other arbitrary things like that?

I've been reconfiguring servers that were vMotioned from one DC to another
... the nic names are ALWAYS *slightly* different.

Im not sure why the way you access single user mode had to change.

Thanks,
Alexander.

Sent from my Samsung Galaxy S8+

On Tue, Dec 4, 2018, 13:41 Brian Cluff <brian@snaptek.com wrote:

> On 12/4/18 12:40 PM, Snyder, Alexander J wrote:
> > Does anyone know why networking devices aren't eth0/1/2/3 but are now
> > ens0f0/enp0d0.
>
> Those are the new "Predictable Network Interface Names" based on where
> they are physically plugged into the system.
> You can read all about them here:
>
> https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/
> In a nut shell they make sure that you device names don't ever change
> which is really annoying when you have a server is hosted out of state
> and can't get your hands on it to fix all your scripts that use eth0 as
> your internet facing interface when it suddenly switches places with
> eth1 or gets bumped to eth3 for any number of reasons.
> The new names are a little jarring at first, but if you allow yourself
> to get used to them then you will be able to tell someone, without any
> doubt, based on the devices name which exact device needs to be swapped
> out when it fails, and the replacement device will be given the same
> name, as long as it's plugged into the same place)
>
> > Also getting into single user mode now is (IMHO) unnecessarily
> > complicated (typing 'single' versus now 'init=/sysroot/bin/bash').
>
> init=/sysroot/bin/bash has always worked and is my preferred way of
> getting into a system without running anything else.  That line simply
> tells grub to bypass starting the system's init system which is systemd
> on the newer systems and to instead run bash as linux's init.
>
> If you are looking to get into a true single user mode you will probably
> want to instead use one of the following lines where you were previously
> using init=/sysroot/bin/bash:
>
> systemd.unit=rescue.target (can be shortened to systemd.unit=rescue)
> or
> systemd.unit=emergency.target (can be shortened to systemd.unit=emergency)
>
> The emergency target is the most minimal of the 2.
>
> Brian Cluff
>
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