[rhelv6-list] dhclient running TWICE during boot (RHEL 6.2)

[Bill Nottingham]

Bill Nottingham (notting at redhat.com) said: 
> Paul Smith (paul at mad-scientist.net) said: 
> > So I tried this.  If I set ONBOOT=no and NM_CONTROLLED=yes, then the
> > system boots BUT it never brings up the network interface at all, until
> > I log in at the console.  That's not acceptable, I want the network
> > interface to come up automatically at boot so I can access it remotely
> > if it reboots without having to go log into it.
> 
> NM honors ONBOOT=no, so this is expected.
> 
> > So I switched them and set ONBOOT=yes and NM_CONTROLLED=no.  When I
> > rebooted this time the network interface came up (with the "wrong" IP
> > address), but no default route was created!  So I couldn't access any
> > other hosts.  Of course I can do this by hand but again, I don't want to
> > have to to fix the host whenever it reboots.
> 
> This means that it's only brought up by /etc/init.d/network; route should
> be grabbed from the DHCP server.
> 
> > Here's even more awesome: looking through the scripts I saw a USE_NM
> > variable, so I tried adding "USE_NM=yes" to my ifcfg-Auto_eth0 script.
> > When I rebooted this time the boot process HUNG when S10network was
> > trying to bring up eth0.  I couldn't ^C or ^Z or switch to an alternate
> > console (maybe it's too early for them?).  The only keys that would do
> > anything were CTRL-ALT-DEL and that just brought me right back to the
> > same state.  Trying to boot into safe mode gave me a kernel panic.
> 
> USE_NM is internal initscripts accounting - I suppose it should be
> namespaced off. It's not ment as an end-user configuration variable.

So, I suspect that a lot of this is due to lease file confusion between
the initscripts and NetworkManager; they're using different lease file
names, so dhclient does DISCOVER instead of just renewing the existing
lease.

As a workaround in initscripts, you can massage something like:

http://git.fedorahosted.org/git/?p=initscripts.git;a=commitdiff;h=60b84547c03ec7d82633f3c9d6939af4747a6bff

to apply on RHEL 6, and remove your lease files and reboot.

I've filed a bug to have NM adjust to the existing lease file names on RHEL
6:
https://bugzilla.redhat.com/show_bug.cgi?id=817660

which would help as well.

Bill