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Grub.md

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Workaround centos boot system being a piece of crap

install grub

install grub & non-xen kernel. Centos5/5 relies on:

  • anaconda creating valid /boot/grub/grub.conf
  • currently running kernel = kernel in /boot/grub/grub.conf

in other words, no grub.conf => fuck you, no update-grub that is in decent distros, and grub-install usually doesnt work correctly...

to fix it:

  • create grub.conf; example for kvm with serial console:

       # grub.conf generated by anaconda
   #
   # Note that you do not have to rerun grub after making changes to this file
   # NOTICE:  You do not have a /boot partition.  This means that
   #          all kernel and initrd paths are relative to /, eg.
   #          root (hd0,0)
   #          kernel /boot/vmlinuz-version ro root=/dev/xvda1
   #          initrd /boot/initrd-version.img
   #boot=/dev/xvda
   default=0
   timeout=5
   #splashimage=(hd0,0)/boot/grub/splash.xpm.gz
   serial --unit=0 --speed=9600
   terminal --timeout=5 serial console
   title CentOS (<%= @kernelrelease %>)
       root (hd0,0)
       kernel /boot/vmlinuz-<%= @kernelrelease %> ro root=LABEL=/ console=ttyS0 console=tty1
       initrd /boot/initrd-<%= @kernelrelease %>.img

specify both consoles (tty1/ttyS0) if you want to have both vnc and virsh console console

  • install kernel & grub, setup initrd

      yum install -y kernel grub
  export ver=target_kernel_version # whatever version just installed, should match kernel file name
  mkinitrd --with virtio_pci --with virtio_blk --allow-missing -f /boot/initrd-$ver.img $ver

  • add device.map `(hd0) /dev/xvda'

  • install grub (if grub-install fails)

      device (hd0) /dev/vda
  root (hd0,0)
  setup (hd0)

  • fixup /etc/fstab, virtio device nodes are vd*

  • fixup console in /etc/inittab if needed