[Users] Host discovery failing due to host network being lost

[Deepak C Shetty]

Hi ovirt users,

I was trying to check on IRC the below, did not get any replies, so 
sending this mail.
Can someone help me understand what could be the issue that causing my 
managed host to lose network settings, when i try to discover it from 
ovirt-engine ?
I have to then manually (using a remote console) re-setup the network.. 
it even overrites my ifcfg-eth0 file

I see a new bridge getting added called ovirtmgmt and route entry corr. 
to that.. the ifcfg-eth0 also has that entry
I feel that ovirt scripts running on the host should atleast take a 
backup of the ifcfg* files they modify so that in case of issues like 
these, user can login via remote console and restore the original ifcfg 
file.

This is what i asked on IRC... responses appreciated...

deepakcs> Hello, i just configured ovirt-engine and discovering my first 
managed host.. got some Qs
<deepakcs> what diff does it make when i select "override ip tables" 
check box during new Host workflow ?
* djasa has quit (Ping timeout: 480 seconds)
<deepakcs> this is the second time i am discovering this host and 
everytime the host discovery hangs during "Installing" and if i check 
the host, it goes out of network.... has anybody faced this problem before ?
<deepakcs> While discovering the host, the host network ipv4 address is 
gone ! and thus the host goes out of network

Some more updates..
1) I manually re-setup the host network, made it pingable, esp from the 
ovirt-engine node, and clicked on Re-install on the web gui, this time 
with the 'override ip tables' check enabled
2) this time it successfully completed the node bootstrap steps (as seen 
from the Events window) and status was Reboot
3) But after reboot the same thing happened.. the host lost ipv4 addr, 
route entries are completely gone and onthe web gui the host is seen as 
non-responsive, which is expected bcos the host is not on the network 
anymore...

what is the reason the above is happening ?