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Disable network on remastered Ubuntu 13.04 Live-CD except for localhost

rated 0 times [ 0] [ 0] / answers: 1 / hits: 1430 / 12 Months ago, wed, may 31, 2023, 2:29:10

I have remastered a Ubuntu 13.04 Live-CD for software presentations. During boot, it tries to find a network connection for several minutes (but fails in the end). Maybe it does not detect my network card properly (MacBook Pro). For the live system I don't need an internet connection. Only access to localhost is important.

How do I prevent the system from configuring the network/internet connection while still preserving access to localhost?

If I can not turn this off, is it possible to reduce the timeout for this configuration process?

EDIT: I forgot to say that I used a minimal Ubuntu 13.04 with command line only. Hence, no GUI components are responsible for the delay.

EDIT 2: The /etc/network/interfaces of the Live-DVD before remastering is

# interfaces(5) file used by ifup(8) and ifdown(8)

auto lo

iface lo inet loopback

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warrdel

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3 Years ago

answered 12 Months ago singerrupt · Accepted Answer

I solved it by editing /etc/init/failsafe.conf, which contained the messages and the delays:

# failsafe



description "Failsafe Boot Delay"

author "Clint Byrum <[email protected]>"



start on filesystem and net-device-up IFACE=lo

stop on static-network-up or starting rc-sysinit



emits failsafe-boot



console output



script

    # Determine if plymouth is available

    if [ -x /bin/plymouth ] && /bin/plymouth --ping ; then

        PLYMOUTH=/bin/plymouth

    else

        PLYMOUTH=":"

    fi



    # The point here is to wait for 2 minutes before forcibly booting 

    # the system. Anything that is in an "or" condition with 'started 

    # failsafe' in rc-sysinit deserves consideration for mentioning in

    # these messages. currently only static-network-up counts for that.

    sleep 20



    # Plymouth errors should not stop the script because we *must* reach

    # the end of this script to avoid letting the system spin forever

    # waiting on it to start.

    $PLYMOUTH message --text="Waiting for network configuration..." || :

    sleep 40



    $PLYMOUTH message --text="Waiting up to 60 more seconds for network configuration..." || :

    sleep 59



    $PLYMOUTH message --text="Booting system without full network configuration..." || :



    # give user 1 second to see this message since plymouth will go

    # away as soon as failsafe starts.

    sleep 1

    exec initctl emit --no-wait failsafe-boot

end script



post-start exec logger -t 'failsafe' -p daemon.warning "Failsafe of 120 seconds reached."

Just replace the xx in sleep xx with a small value. It might also be possible to remove the sleep commands. This does not necessarily disable the network interfaces, but reduces the time for the system trying to find a connection.