Hi everyone, I'm working with libguestfs 1.30.3 on Centos 7 host. I encountered a problem when I wanted to install extlinux with guestfish as a bootloader for my guests and I always get this error: SYSLINUX 4.05 EDD 0x54f93f16 Copyright (C) 1994-2010 H. Peter Anvin et al ERROR: No configuration file found No default or UI configuration directive found! boot: _ *This is how I create the virtual machines:* lvcreate -n vm_name -L 9G vm_volumes parted /dev/vm_volumes/vm_name mklabel msdos parted -a optimal /dev/vm_volumes/vm_name mkpart primary ext4 0% 100% parted /dev/vm_volumes/vm_name set 1 boot on kpartx -av /dev/vm_volumes/vm_name mkfs.ext4 /dev/mapper/loop0p1 mount /dev/mapper/loop0p1 /mnt/clone tar -zxf /root/centos7_template.tar.gz -C /mnt/clone/ umount /mnt/clone kpartx -dv /dev/vm_volumes/vm_name

/root/libguestfs-1.30.3/run guestfish -i -a /dev/vm_volumes/{vm_name} << _EOF_ \n\ #####mbr.bin and syslinux already existant in centos7_template.tar.gz#### copy-file-to-device /boot/mbr.bin /dev/sda size:440 \n\ extlinux /boot \n\ part-set-bootable /dev/sda 1 true \n\ _EOF_ *And this is the syslinux.cfg file:* DEFAULT linux LABEL linux SAY Booting the kernel KERNEL /boot/vmlinuz-3.10.0-229.el7.x86_64 INITRD /boot/initramfs-3.10.0-229.el7.x86_64.img APPEND ro root=UUID={{ UUID }}

Thank you for the quick response. > Strange way to do this, as libguestfs can do all this. Sorry to ask this (I'm a newly graduated engineer and I new to the virtualization world), but how can libguestfs do all of the above?, do you mean it can create all the partitions inside a new lvm volume or a new raw image??

<fs> run

<fs> part-init /dev/sda msdos <fs> part-disk /dev/sda msdos <fs> mkfs ext4 /dev/sda1 <fs> mount /dev/sda1 / <fs> tgz-in /tmp/libguestfs-1.31.18.tar.gz /

> Did you copy the syslinux.cfg file into the guest? The error message > you reported sounds like extlinux is installed but cannot read its > config file. Yes I'm sure that I copied the syslinux.cfg in the guest and that's why I was confused with the error message. My problem is that the exact same steps worked on a ubuntu 14.04 host with libguestfs 1.24.5 , and I can't see why it won't work on a centos7 host , that's why I thought about a problem with this libguestfs version (1.30.3). Here's how I installed extlinux (I already saw the link that you sent me and I don't think I made a mistake) but the guest still don't want to boot: [root@localhost libguestfs-1.30.3]# ./run guestfish -i -a /dev/vm_volumes/clone2 Welcome to guestfish, the guest filesystem shell for editing virtual machine filesystems and disk images. Type: 'help' for help on commands 'man' to read the manual 'quit' to quit the shell Operating system: CentOS Linux release 7.1.1503 (Core) /dev/sda1 mounted on / ><fs> ls /boot/ .vmlinuz-3.10.0-229.el7.x86_64.hmac System.map-3.10.0-229.el7.x86_64 config-3.10.0-229.el7.x86_64 grub grub2 initramfs-0-rescue-c898899928d341b58ae4d02802d19340.img initramfs-3.10.0-229.el7.x86_64.img initramfs-3.10.0-229.el7.x86_64kdump.img initrd-plymouth.img ldlinux.sys mbr.bin symvers-3.10.0-229.el7.x86_64.gz syslinux.cfg vmlinuz-0-rescue-c898899928d341b58ae4d02802d19340 vmlinuz-3.10.0-229.el7.x86_64 ><fs> cat /boot/syslinux.cfg DEFAULT linux LABEL linux SAY Booting the kernel KERNEL /boot/vmlinuz-3.10.0-229.el7.x86_64 INITRD /boot/initramfs-3.10.0-229.el7.x86_64.img APPEND ro root=UUID=8e137cd9-cd6c-4205-a27f-211d6184a5f3 ><fs> copy-file-to-device /boot/mbr.bin /dev/sda size:440 ><fs> extlinux /boot ><fs> part-set-bootable /dev/sda 1 true