Public bug reported: On paravirtualised Xen, cloud-init will not rerun grub. KVM may also have issues.
The problem is at: http://bazaar.launchpad.net/~cloud-init-dev/cloud-init/trunk/view/head:/cloudinit/CloudConfig/cc_grub_dpkg.py line 47. The 'if' condition at line 36 handles the case where a block major device is presented as /dev/sda1 (or /dev/xvda1), which it detects by the absence of /dev/sda or /dev/xvda (as appropriate). This takes into account the odd EC2 way of doing things. The else condition at line 42 is run in a non-EC2 mode, where either the block major itself is a filing system, or the block major contains a partition table. The for loop at line 47 then runs through 'all' the first block minor devices (i.e. first partitions), then (if it fails to find any) the block majors. The first issue is that running on Xen on HVM with PV drivers, the emulated device is PCI unplugged early in the boot sequence, so there is no /dev/sda or /dev/sda1, just /dev/xvda and /dev/xvda1. Line 47 will thus not pick this up. /dev/xvda and /dev/xvda1 should thus be added to this line. The second issue is that I /think/ /dev/vda should be listed before /dev/sda, and /dev/vda1 before /dev/sda1. This is because running on kvm, both devices will appear under some circumstances (e.g. where the cloud provider cannot determine whether the OS has PV drivers or not so provides both emulated and PV drevice), and I think it's desirable that grub thinks it is installing on the virtual device /dev/vda1. IE I think the line should be: for dev in ("/dev/xvda", "/dev/vda", "/dev/sda", "/dev/xvda1", "/dev/vda1", "/dev/sda1"): Complete untested patch attached. ** Affects: cloud-init (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to cloud-init in Ubuntu. https://bugs.launchpad.net/bugs/961240 Title: cloud-init does not run grub on PV Xen and KVM has issues To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/961240/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
