[CentOS] Question about running a CentOS4.8 (32-bit) guest under CentOS5.4xen (64-bit)

Pasi Kärkkäinen pasik at iki.fi
Sat Jan 23 16:19:54 UTC 2010


On Fri, Jan 22, 2010 at 04:37:30PM -0500, Robert Heller wrote:
> I am trying to run my old CentOS4.8 (32-bit) system as a guest system
> under CentOS5.4xen (64-bit).  I followed the instructions in Appendix A
> of the xen user manual (/usr/share/doc/xen-3.0.3/pdf/user.pdf) and
> created a 'disk image' (actually a 10gig LVM logical volume:
> 

Check this instead: 
http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.4/html/Virtualization_Guide/index.html

You can install CentOS4 guest using virt-install or virt-manager.

The problem you have with your custom-made guest is that you're not using 
a Xen PV kernel.

iirc it's called kernel-xenU in EL 4.8.

-- Pasi

> sauron.deepsoft.com% sudo fdisk -l /dev/mapper/sauron-c4guest
> 
> Disk /dev/mapper/sauron-c4guest: 10.7 GB, 10737418240 bytes
> 16 heads, 32 sectors/track, 40960 cylinders
> Units = cylinders of 512 * 512 = 262144 bytes
> 
>                      Device Boot      Start         End      Blocks   Id
>  System
> /dev/mapper/sauron-c4guest1   *           1       40960    10485744   83
>  Linux
> sauron.deepsoft.com% sudo lomount -t ext3 -diskimage
> /dev/mapper/sauron-c4guest -partition 1 /mnt/guest
> sauron.deepsoft.com% ls -ltr /mnt/guest/boot
> total 17432
> -rw-r--r-- 1 root root   51614 Jan 21 20:35 config-2.6.9-89.0.11.EL
> -rw-r--r-- 1 root root 1425764 Jan 21 20:35 initrd-2.6.9-89.0.16.EL.img
> -rw-r--r-- 1 root root  832064 Jan 21 20:35 initrd-2.6.9-89.0.15.EL.img
> -rw-r--r-- 1 root root  832055 Jan 21 20:35 initrd-2.6.9-89.0.11.EL.img
> -rw-r--r-- 1 root root  766328 Jan 21 20:35 initrd-2.6.9-78.0.22.EL.img-orig
> -rw-r--r-- 1 root root   51613 Jan 21 20:35 config-2.6.9-89.0.9.EL
> -rw-r--r-- 1 root root   55212 Jan 21 20:35 config-2.6.9-89.0.18.EL.plus.c4
> -rw-r--r-- 1 root root   51614 Jan 21 20:35 config-2.6.9-89.0.16.EL
> -rw-r--r-- 1 root root   51614 Jan 21 20:35 config-2.6.9-89.0.15.EL
> -rw-r--r-- 1 root root  768504 Jan 21 20:35 System.map-2.6.9-89.0.9.EL
> -rw-r--r-- 1 root root  787043 Jan 21 20:35 System.map-2.6.9-89.0.18.EL.plus.c4
> -rw-r--r-- 1 root root  768660 Jan 21 20:35 System.map-2.6.9-89.0.16.EL
> -rw-r--r-- 1 root root  768660 Jan 21 20:35 System.map-2.6.9-89.0.15.EL
> -rw-r--r-- 1 root root  768606 Jan 21 20:35 System.map-2.6.9-89.0.11.EL
> -rw-r--r-- 1 root root   67596 Jan 21 20:35 symvers-2.6.9-89.0.9.EL.gz
> -rw-r--r-- 1 root root   78176 Jan 21 20:35 symvers-2.6.9-89.0.18.EL.plus.c4.gz
> -rw-r--r-- 1 root root   67596 Jan 21 20:35 symvers-2.6.9-89.0.16.EL.gz
> -rw-r--r-- 1 root root   67596 Jan 21 20:35 symvers-2.6.9-89.0.15.EL.gz
> -rw-r--r-- 1 root root   67596 Jan 21 20:35 symvers-2.6.9-89.0.11.EL.gz
> -rw-r--r-- 1 root root  832001 Jan 21 20:35 initrd-2.6.9-89.0.9.EL.img
> -rw-r--r-- 1 root root 1533159 Jan 21 20:35 vmlinuz-2.6.9-89.0.9.EL
> -rw-r--r-- 1 root root 1579298 Jan 21 20:35 vmlinuz-2.6.9-89.0.18.EL.plus.c4
> -rw-r--r-- 1 root root 1536244 Jan 21 20:35 vmlinuz-2.6.9-89.0.16.EL
> -rw-r--r-- 1 root root 1536207 Jan 21 20:35 vmlinuz-2.6.9-89.0.15.EL
> -rw-r--r-- 1 root root 1533468 Jan 21 20:35 vmlinuz-2.6.9-89.0.11.EL
> drwxr-xr-x 2 root root    4096 Jan 21 20:36 grub
> -rw-r--r-- 1 root root  796960 Jan 22 15:35 initrd-2.6.9-89.0.18.EL.plus.c4.img
> sauron.deepsoft.com% cat /mnt/guest/boot/grub/grub.conf
> # grub.conf generated by anaconda
> #
> # Note that you do not have to rerun grub after making changes to this file
> # NOTICE:  You have a /boot partition.  This means that
> #          all kernel and initrd paths are relative to /boot/, eg.
> #          root (hd0,0)
> #          kernel /vmlinuz-version ro root=/dev/sauron/c5root
> #          initrd /initrd-version.img
> #boot=/dev/sda
> default=1
> timeout=5
> #splashimage=(hd0,0)/grub/splash.xpm.gz
> hiddenmenu
> title CentOS4 (2.6.9-89.0.18.EL.plus.c4)
> 	root (hd0,0)
> 	kernel /boot/vmlinuz-2.6.9-89.0.18.EL.plus.c4 ro root=/dev/hda1 single
> 	initrd /boot/initrd-2.6.9-89.0.18.EL.plus.c4.img
> 
> pygrub seems to be happy:
> 
> sudo /usr/bin/pygrub /dev/mapper/sauron-c4guest
> 
> [Reasonable imitation of a Grub boot screen]
> 
> linux (kernel /var/lib/xen/boot_kernel.8bcf-G)(ramdisk /var/lib/xen/boot_ramdisk
> 
> But when I try to start the guest, I get:
> 
> error: POST operation failed: xend_post: error from xen daemon:
> (xend.err "Error creating domain: (2, 'Invalid kernel',
> 'xc_dom_find_loader: no loader found\\n')")
> 
> I googled this error message and the only hits I got were about FC11 or
> FC12 and some issue relating to how the kernel image was compressed,
> which probably does not relate to an *older* CentOS 4 kernel.
> 
> The config file for this guest is: 
> 
> sauron.deepsoft.com% sudo cat /etc/xen/c4guest
> name = "c4guest"
> uuid = "06bfb4e1-c427-c93c-2365-b80b832bb6d4"
> maxmem = 512
> memory = 512
> vcpus = 1
> bootloader = "/usr/bin/pygrub"
> on_poweroff = "destroy"
> on_reboot = "restart"
> on_crash = "restart"
> vfb = [ "type=vnc,vncunused=1,keymap=en-us" ]
> disk = [ "phy:/dev/mapper/sauron-c4guest,xvda,w" ]
> vif = [ "mac=00:16:36:0a:d9:ac,bridge=virbr0,script=vif-bridge" ]
> 
> What am I missing?
> 
> It also appears I am limited to paravirtualization (does this matter?),
> because my processor does not seem to support hardware virtualization
> support:
> 
> processor	: 0
> vendor_id	: AuthenticAMD
> cpu family	: 15
> model		: 127
> model name	: AMD Sempron(tm) Processor LE-1300
> stepping	: 2
> cpu MHz		: 1000.000
> cache size	: 512 KB
> fpu		: yes
> fpu_exception	: yes
> cpuid level	: 1
> 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 syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow up pni cx16 lahf_lm extapic cr8_legacy misalignsse
> bogomips	: 2000.01
> TLB size	: 1024 4K pages
> clflush size	: 64
> cache_alignment	: 64
> address sizes	: 40 bits physical, 48 bits virtual
> power management: ts fid vid ttp tm stc 100mhzsteps
> 
> 
> 
> -- 
> Robert Heller             -- 978-544-6933
> Deepwoods Software        -- Download the Model Railroad System
> http://www.deepsoft.com/  -- Binaries for Linux and MS-Windows
> heller at deepsoft.com       -- http://www.deepsoft.com/ModelRailroadSystem/
>                                                                                                        
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