Public bug reported:
Binary package hint: casper
When netbooting the live CD over NFS, the network connection must be
preserved throughout the live session so that the filesystem remains
accessible. Currently, this is achieved by adding the following lines to
/etc/network/interfaces which prevents network manager from attempting
to reestablish a connection once the desktop finally appears:
auto eth0
iface eth0 inet manual
These lines are added by casper in a script called 23networking. Here
are a few relevant lines from the script:
if [ -z "${NETBOOT}" ]; then method="dhcp"; else method="manual"; fi
if [ "$method" != dhcp ] || [ ! -x /root/usr/sbin/NetworkManager ]; then
# ...
cat >> "$IFFILE" <<EOF
auto $i
iface $i inet $method
EOF
fi
So, this at least enables the live cd environment to be loaded over NFS.
However, the problem is that this later gets propagated to the installed
environment if ubiquity is called. This is done by the install.py script
and here are the relevant lines from the script:
for path in ('/etc/network/interfaces', '/etc/resolv.conf'):
if os.path.exists(path):
shutil.copy2(path, os.path.join(self.target, path[1:]))
In the most common general case, this is the desired behavior so that
the user's network configuration is propagated from the live to the
installed environment. However, in the case of netbooting the live cd,
this is not necessarily the case because this environment needs to make
assumptions about the network which might not apply anymore once the
system boots from a driver rather than from the network.
I suspect the behavior should be that a best effort should be done when
attempting to propagate the network configuration from the live
environment when netbooting. This would mean preserving the
configurations for all the network interfaces except the one used to
mount the filesystem over NFS. The reasoning is that some assumptions
were made about that interface which were only relevant in this context,
so all bets are off about preserving that configuration.
In order to achieve this desired behavior, I would suspect that casper
would need to communicate somehow to ubiquity that a particular part of
the network configuration should not be propagated to the installed
environment. This could probably be accomplished by using the
configuration file as the communication interface. For example, the
interfaces file could look something like:
# BEGIN IGNORE
auto eth0
iface eth0 inet manual
# END IGNORE
Then, ubiquity could easily parse that out when propagating the network
configuration from the live to the installed environment.
** Affects: ubiquity
Importance: Undecided
Status: New
** Affects: casper (Ubuntu)
Importance: Undecided
Status: New
** Also affects: ubiquity
Importance: Undecided
Status: New
--
netboot insall of live cd results in a manual network interface configuration
https://bugs.launchpad.net/bugs/388060
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