Thanks everyone for the quick response. Useful education for me but, as far as I can tell,
neither of those approaches quite achieves what I'm looking for.
I should explain a bit more about my root-over-nfs setup. To simplify, I have two computers, C1 and C2,
and each machine has two ethernet NICs with MAC addresses M1a, M1b, and M2a , M2b respectively.
C1 has M1a and M1b
C2 has M2a and M2b
On each machine there is a linux installation which might run on either machine,
either locally or by mounting root over nfs from the other.
I would ideally like a single content for each of my systems' 60-net.rules, naming all 4 NICs,
and assigning a unique eth[n] name to each one but *only* if the kernel did not already name it eth0
(which is what the kernel does if told to configure a network interface itself for nfs-mount purposes)
In other words, I want all 4 interfaces to have a consistent name except when in use for mounting root over nfs.
So I would have content looking like
# mobo 8168
SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="[M1a]", ... KERNEL!="eth0", NAME="eth1"
# PCI via-rhine
SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="[M1b]", ... KERNEL!="eth0", NAME="eth2"
# mobo yukon2
SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="[M2a]", ... KERNEL!="eth0", NAME="eth3"
# e1000
SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="[M2b]", ... KERNEL!="eth0", NAME="eth4"
And that's what I've done and, in the absence of write_net_rules , it works.
Now if I may ask questions about your specific suggestions:
Kay Sievers wrote:
>
> Rules in /etc over-rule rules in /lib with the same name.
>
> echo "# disable net-generator rules in /lib/udev" > \
> /etc/udev/rules.d/75-persistent-net-generator.rules
>
That looks perfect - except ... I already have a /etc/udev/rules.d/75-persistent-net-generator.rules
and at the top it says:
# do not edit this file, it will be overwritten on update
Is that true? If so - although I can see this would work, I'm no better off than editing the /lib/udev/write_net_rules am I?
Andrey Borzenkov wrote:
>
> /lib/udev/rules.d/75-persistent-net-generator.rules should not call
> write_net_rules if NAME is already set, so
>
> KERNEL=="eth0", NAME="eth0"
>
I think I see how this would prevent the renaming but how can I achieve the renaming I *do* want?
It seems to me that adding KERNEL=="eth0", NAME="eth0" would prevent udev from doing anything when
KERNEL!="eth0", wouldn't it? I didn't try it but that's my reading of the man page -
there is no syntax for parenthesising conditions e.g.
( KERNEL=="eth0", NAME="eth0" ) || ( KERNEL!="eth0", NAME="eth1" )
is there?
I have one more question - is there any master user-specified profile or config file associated with udev?
Something which orchestrates all the other parts?
Cheers, John
>
> --
> ciao,
> Marco
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