I've also had a few Xen systems grub entry issues. I'm not yet sure what triggers the events, but I do think there *may* be a correlation to the "/boot" part. I've found the Xen servers that have "/boot" before any of the the lines like "/boot/xen.gz" ended up missing complete grub entries. Not sure it's 100% true. Anyone else comment?
Thanks
PJ
On Sun, Dec 20, 2015 at 5:31 AM, Phill Bandelow <phill@xxxxxxxxx> wrote:
HI,Disabling APIC gives the following console output:
We've started to see several issues with the Xen releases. Going back to basics I've used this guide https://wiki.centos.org/HowTos/Xen/Xen4QuickStart
Once the install process is complete the grub.conf looks like this:
default=0
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
title CentOS (3.18.21-17.el6.x86_64)
root (hd0,0)
kernel /boot/xen.gz dom0_mem=1024M,max:1024M cpuinfo com1=115200,8n1 console=com1,tty loglvl=all guest_loglvl=all
module /boot/vmlinuz-3.18.21-17.el6.x86_64 ro root=/dev/vda1 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
title CentOS (2.6.32-573.12.1.el6.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32-573.12.1.el6.x86_64 ro root=/dev/vda1 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
initrd /boot/initramfs-2.6.32-573.12.1.el6.x86_64.img
title CentOS (2.6.32-358.el6.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32-358.el6.x86_64 ro root=UUID=71b203ab-36ea-4aa8-9ba3-78e4109f0ca4 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
initrd /boot/initramfs-2.6.32-358.el6.x86_64.img
As you can see the missing module line. If i manually run grub-bootxen.sh nothing changes.
Manually adding the missing module entry:
module /boot/initramfs-3.18.21-17.el6.x86_64.img
Causes the following:
https://www.dropbox.com/s/ley5nj29ubwqogc/Screenshot%202015-12-20%2011.10.11.png?dl=0Now i know this is inside a KVM virtual machine, however we are starting to see this issue on at least 7 standard dedicated servers.
[root@test ~]# rpm -qa | grep xen
xen-libs-4.4.3-9.el6.x86_64
xen-hypervisor-4.4.3-9.el6.x86_64
xen-4.4.3-9.el6.x86_64
centos-release-xen-7-11.el6.x86_64
xen-licenses-4.4.3-9.el6.x86_64
xen-runtime-4.4.3-9.el6.x86_64
[root@test ~]# cat /etc/redhat-release
CentOS release 6.7 (Final)
[root@test ~]#
[root@test ~]# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Quad CPU Q9400 @ 2.66GHz
stepping : 10
microcode : 1
cpu MHz : 2666.352
cache size : 4096 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx lm constant_tsc arch_perfmon unfair_spinlock pni ssse3 cx16 sse4_1 x2apic xsave hypervisor lahf_lm
bogomips : 5332.70
--Regards,
Phill
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