I am trying to install Xen on Centos6.5 based on this tutorial ), however after installing xen and running the script to edit the grub.conf, i am not able to boot into the new kernel.
I get an error stating —
invalid magic number: 9090 Error 13: Invalid or unsupported executable format
Can someone help me please?
1 Answer 1
Current suspicion: definitely not a 10 minute install for all platforms.
History: there is a Centos Bug on this: centos.org/print_bug_page.php?bug_ >
I repeated a similar process: (1) Install Centos 6.6 (Centos kernel: 2.6.32-504.el6.x86_84) from DVD1, DVD2 with Install using only the CENTOS Repo (2) Installed Xen (Xen4CentOS kernel:3.10.56-11.el6.centos.alt.X86_64) Issuing the following commands from the centos command line (as root, warnings from readers accepted as correct from a security standpoint) To abate the security concern, no network connection existed as an offline repo would have been used but was not actually needed for the Centos minimal install.
I noticed that the /boot/grub/grub.conf file was non-existent and tried to reboot without it. The reference above suggests it should be there, so I am proposing that your grub.conf file was missing or incorrect because my results were similar:
So as of now I can reproduce the problem. I will be updating this as I discover what will solve it for my solution, post it with hope it fixes it for yours or others who share similar issues.
I noticed something odd, I was using a Combo USB hub and tried to reboot using the other kernel (2.6) and there were considerable failures which were squawking on the startup screen and it would not permit me to start. When I removed it I could not boot into the 3.10, but only into 2.6.
Ok, a quick find on grub.conf revealed a similar version to that shown on the reference link above in /etc. So I copied the grub.conf from /etc to /boot/grub and rebooted. But I too see similar results. The USB hub is off the system and will not be reattached, so there is something else here that needs review. I’m digging into the grub.conf file at this time.
(update) I see that there is a grub.conf file under /boot/efi/EFI/redhat. Oddly in the Centos ‘bug archives’ there appears to be a related resolved bug for Centos 7: bugs.centos.org/view.php? >
Also, as this relates to magic number here are results for my type of files and magic numbers, but I have done this with vi and have some assumptions here about what I saw, so I am retrying this with the help of the other stackoverflow article which uses file-devel package LibMagic. here are the intermittent results.
Note: A search of ‘9090’ on centos.org using the provided search engine for words on the site yielded no response on 12/22/14: @wiki.centos.org/Search There is no mention of installation problems with SELinux, even though I have set:
in the /etc/sysconfig/selinux file and
No results, and no new grub file in any of the three locations listed above. /etc /boot or /boot/efi/EFI/redhat.
Comparison of the grub.conf files with other sources, show that it is reasonable. Same for the grub-bootxen.sh file based on what I could decipher from bash.
Changing the timeout in grub.conf (all I found) to 15 and removing the hiddenmenu command by #hiddenmenu, did not eliminate the ‘9090’ error. Using: wiki.xen.org/wiki/RHEL6_Xen4_Tutorial which shows the ‘kernel’ modifier instead of the ‘module’ and changing the ‘module’ in front of the .img file to initrd, did not change the results.
Ok, I would have to say that the question was not well defined. It is now well defined and can be posed as a question. I will convert this info and my trials to a reasonable question to see if anyone can assist with pointers.
I want to install linux os to my laptop, and i follow the instructions on google «how to make dual bootable linux and windows»
I have download the linux mint, rufus
But i trying to boot the usb, i got error
What i can to fix the problem ? Please help me, i will apreciate all answer
When booting to CentOS bootable USB. The way I made the USB (on Ubuntu 17) is:
- Download CentOS-7-x86_64-DVD-1708.iso
- dd if=CentOS-7-x86_64-DVD-1708.iso of=/dev/sdc status=progress
- Booted to the boot menu, chose the USB drive, then chose Install Centos 7
How do I do this?
2 Answers 2
Your command seems okay, just try few things, double check device name, make sure device is not mounted while writing and at the end try running sync command.
I was chasing this same error and it turned out that the USB flash drive I was using was bad. I found this out by running an immediate verify after creating it. Here’s an example of what a successful verify would look like:
Since the USB device could be slightly larger than the original ISO, it’s important to limit the amount of data read to the same data that was written. («count=»)
On my broken USB, after a couple hundred blocks I got an I/O error on read even though it was just written without error.