[CentOS-virt] CentOS-virt Digest, Vol 100, Issue 12

Sahil Khan
2015-12-15T06:21:42Z

Hi,

I also face this kind of error while installing centos from usb drive and
when I select it uefi mode in bios its got resolve the issue and finally i
am able to install centos from usb drive.?





Regards,
Sahil | 9930870258

On Mon, Dec 14, 2015 at 5:30 PM, <centos-virt-request at centos.org>
wrote:

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> Today's Topics:
>
>    1. boot thumbdrive with CentOS 7 ISO??? (ken)
>    2. Re: [CentOS] boot thumbdrive with CentOS 7 ISO??? (ken)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 13 Dec 2015 16:48:25 -0500
> From: ken <gebser at mousecar.com>
> To: CentOS mailing list <centos at centos.org>, centos-virt at
centos.org
> Subject: [CentOS-virt] boot thumbdrive with CentOS 7 ISO???
> Message-ID: <566DE7A9.9060307 at mousecar.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> The big picture is I'm wanting to boot centos 7 and install kvm.
>
> So far I've created on this new laptop a big, empty partition; in the
> BIOS enabled legacy booting and disabled UEFI; also in BIOS under Legacy
> Boot Order set "USB diskette on key/USB hard disk" on second
priority.
> I've tried to boot from a usb thumbdrive three times and it failed all
> three times.  I'm not understanding what's wrong.
>
> I tried all three methods below as root using CentOS 5.11, copied it to
> the thumbdrive with:
>
> dd if=CentOS-7-x86_64-Everything-1503-01.iso of=/dev/sda bs=1024
>
> (Tried this because some webpage said)
>
> isohybrid CentOS-7-x86_64-Everything-1503-01.iso
>
> dd if=~CentOS-7-x86_64-DVD-1503-01.iso of=/dev/sda
>
> None of these successfully booted.  Instead they ignored the flash drive
> as it wasn't there.
>
> Documentation in various webpages I found gave different recipes for
> creating the thumbdrive contents (many of which didn't make sense to
> me).  Does anyone have experience with success with this...?
>
> Thanks much.
>
>
> PS. Also in the BIOS, should I enable Virtualization Technology?  I'm
> sorting guess I should.  The Windows docs recommend not to.  I'm
> thinking though it would be preferred for KVM.  What's the certain
verdict?
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 14 Dec 2015 04:30:08 -0500
> From: ken <gebser at mousecar.com>
> To: CentOS mailing list <centos at centos.org>, centos-virt at
centos.org
> Subject: Re: [CentOS-virt] [CentOS] boot thumbdrive with CentOS 7
>         ISO???
> Message-ID: <566E8C20.6080701 at mousecar.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> On 12/13/2015 05:00 PM, Frank Cox wrote:
> > On Sun, 13 Dec 2015 16:48:25 -0500 ken wrote:
> >
> >> So far I've created on this new laptop a big, empty partition;
in
> >> the BIOS enabled legacy booting and disabled UEFI; also in BIOS
> >> under Legacy Boot Order set "USB diskette on key/USB hard
disk" on
> >> second priority. I've tried to boot from a usb thumbdrive
three
> >> times and it failed all three times.  I'm not understanding
what's
> >> wrong.
> >
> > I install Centos on pretty much everything by setting the bios to use
> > USB as the primary boot device, then booting the Centos Live Image
> > from a flash drive, then hitting the "install to hard drive"
icon on
> > the Live Desktop.  After the installation is complete, set the bios
> > back to use the hard drive as the primary boot device and you're
all
> > set.
>
> Aha!  The problem was that, despite legacy was enabled and uefi was
> disabled, the bios followed 'uefi boot order' and disregarded
'legacy
> boot order'.  Once I changed uefi boot order appropriately, the  bios
> booted the thumbdrive.
>
> However, when the centos menu came up, i.e.:
>
> Install CentOS 7
> Test this media & install CentOS 7
> Troubleshooting -->
>
> [use 'e' or 'c' keys]
>
> regardless of which of the above three I selected via right-arrow, I was
> prompted by:
>
> error: invalid magic number.
> error: you need to load the kernel first.
> Press any key to continue...
>
> I tried also using the 'e' and 'c' keys off this menu; this
brought into
> other menus (which are too much to type up) and on another menu where ^E
> and ^X can be used to 'edit' and 'execute' boot statements,
none of
> which works correctly or is obvious what to alter or enter.
>
> I also got into an interface with a 'grub>' prompt.  I tried
some of the
> grub commands, but had little clue what to do with that.  E.g.,
> "linuxefi /isolinux/isolinux.bin" returned "error: invalid
magic
> number."  Interesting, but not getting CentOS 7 booted.
>
> Any know what else is possible?
>
>
>
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> End of CentOS-virt Digest, Vol 100, Issue 12
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