livecd April 2015

livecd@lists.stg.fedoraproject.org

5 participants
3 discussions

Re: [Fedora-livecd-list] Copying more than 500 MB crashes Fedora Live CD even though there is sufficient RAM
by Moez Roy 17 Apr '15

17 Apr '15

On Thu, Apr 16, 2015 at 4:13 PM, Moez Roy <moez.roy(a)gmail.com> wrote: > Copying more than 500 MB crashes Fedora Live CD even though there is > sufficient RAM. > > It doesn't matter how much RAM your system has, once you copy more > than 500 MB you will get stuff like "Input/output error" or just plain > crashes like "Segmentation fault". > > Why does this happen? I think I figured out why this happens. The file /usr/lib/dracut/modules.d/90dmsquash-live/dmsquash-live-root.sh seems to create a 500MB overlay: dd if=/dev/null of=/overlay bs=1024 count=1 seek=$((512*1024)) 2> /dev/null if [ -n "$setup" -a -n "$readonly_overlay" ]; then RO_OVERLAY_LOOPDEV=$( losetup -f ) losetup $RO_OVERLAY_LOOPDEV /overlay else losetup $OVERLAY_LOOPDEV /overlay fi fi Wouldn't it be more efficient if this was tmpfs instead? This also affects installing applications in the live environment where the installed size is more than 500MB.

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dmsetup status question - number labels?
by Locane 17 Apr '15

17 Apr '15

Hello everyone - I am trying to find out what the numbers represent in the output of a "dmsetup status" command on a LiveCD: [root@localhost ~]# dmsetup status live-osimg-min: 0 4194304 snapshot *1272/1272 16* live-rw: 0 4194304 snapshot *7568/1048576 40* I've asked a Superuser question <http://superuser.com/questions/900783/dmsetup-status-fields-explained>, but it doesn't seem to be getting any activity. The man pages for dmsetup only talk about the "--target" option and don't talk about explicit labels for the numbers - does anyone know what they are? I'm especially interested in the bottom far right numbers, the 7568 / 1048576 - that's about a gibabyte and my LiveCD remounts itself read only as soon as those numbers meet. The smaller value seems to tick up much faster when there are reads and writes to the root filesystem. Can anyone help? Is there a way to increase it from a gibabyte up to something more reasonable to keep my LiveCD from hanging itself every time I copy files in or out? --Michael Seattle, WA

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Foreman discovery image and syslinux
by Lukas Zapletal 15 Apr '15

15 Apr '15

Hello, I maintain foreman-discovery-image project which aims to be minimal fedora/centos-based image that enables bare-metal hardware provisioning via PXE/TFTP by uploading facts and awaiting orders (reboot into Anaconda after TFTP is set up for the particular machine). https://github.com/theforeman/foreman-discovery-image So far I have been pretty successful with livecd-tools. Our image is about 140 MB in size, but my goal is to bring this number even more down because udp/TFTP is slow. Is there any way to tell livecd-creator to create smaller disk image (by default it is 1 GB). Our installation consumes about 350 MBs (unpacked), therefore 512 MB could be good start. Not sure how much bytes I can save with this, but I guess a few. Do you think that tuning ext3/ext4 in the kickstart could save me some extra bytes? I was thinking doing something like --fsprofile=^has_journal or similar to minimize FS metadata. To be honest, I don't understand documentation of kickstart in this regard. I am not sure if this is even allowed syntax: https://github.com/rhinstaller/pykickstart/blob/master/docs/kickstart-docs.… Another question is in regard to syslinux. Can I provide my own syslinux configuration for my live media? I need to provide some extra kernel parameters and the only option is perhaps to unpack, change and repack the ISO image. Many thanks with any tips. For now, my plan is to do some hacks on our side (at least for the syslinux thing) and provide some patches if that makes any sense upstream. -- Later, Lukas #lzap Zapletal

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livecd April 2015