Hi,
I have installed CentOS 7 HVM kernel. I would like to convert it to CentOs 7 PV kernel.
When googled about it, I found that this can be done by following commands
yum install xen or yum install kernel-xen
But, when I tried the below commands, I am getting the error *"No package kernel-xen available.**"*
What am I missing here. Any help is much appreciated.
On 8/18/2015 9:53 PM, Venkateswara Rao Dokku wrote:
I have installed CentOS 7 HVM kernel. I would like to convert it to CentOs 7 PV kernel.
When googled about it, I found that this can be done by following commands
yum install xen or yum install kernel-xen
But, when I tried the below commands, I am getting the error *"No package kernel-xen available.**"*
what version were those instructions for ? AFAIK, there's no xen specific kernel in EL7, Red Hat and therefore CentOS supports KVM as their native virtualization, and the PV drivers for KVM are built in.
Thanks for the reply. Sorry for the typo in the earlier mail. I have PV-HVM of CentOS 7 & I need to convert it to PV kernel.
Basically here I am trying to see whether my PV_HVM kernel is vulenrable to this issue given in the following link http://seclists.org/oss-sec/2015/q3/212
In the above link, it was mentioned that the PV kernel is not vulnerable to this bug, but HVM is. It didnt say anything about PV-HVM.
Can you please help me in this regard?
On Wed, Aug 19, 2015 at 10:43 AM, John R Pierce pierce@hogranch.com wrote:
On 8/18/2015 9:53 PM, Venkateswara Rao Dokku wrote:
I have installed CentOS 7 HVM kernel. I would like to convert it to CentOs 7 PV kernel.
When googled about it, I found that this can be done by following commands
yum install xen or yum install kernel-xen
But, when I tried the below commands, I am getting the error *"No package kernel-xen available.**"*
what version were those instructions for ? AFAIK, there's no xen specific kernel in EL7, Red Hat and therefore CentOS supports KVM as their native virtualization, and the PV drivers for KVM are built in.
-- john r pierce, recycling bits in santa cruz
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
On 8/18/2015 10:37 PM, Venkateswara Rao Dokku wrote:
Thanks for the reply. Sorry for the typo in the earlier mail. I have PV-HVM of CentOS 7 & I need to convert it to PV kernel.
Basically here I am trying to see whether my PV_HVM kernel is vulenrable to this issue given in the following link http://seclists.org/oss-sec/2015/q3/212
that is talking about a problem with QEMU and emulated cdroms, and as far as I can tell, the bug is in the qemu emulator, not in the VM's. it merely states that if you only use PV VM's you won't trigger the bug, but the correct fix is to update your QEMU so there is no bug.
In the above link, it was mentioned that the PV kernel is not vulnerable to this bug, but HVM is. It didnt say anything about PV-HVM.
Can you please help me in this regard?
https://access.redhat.com/security/cve/CVE-2015-5154 suggests QEMU has been fixed as of July 27/28, at least for KVM servers, see the 4 RHSA Errata linked there.
again, RHEL7 and therefore CentOS 7 is all about KVM not Xen.
If you're running someone's xen server, you need to ensure its patched against this bug.
Thanks for the reply.
If we want to have PV kernel for CentOs 7 , are there any guidelines to follow? How we can know before hand itself that this kernel is PV or HVM, without installing kernel?
On Wed, Aug 19, 2015 at 11:27 AM, John R Pierce pierce@hogranch.com wrote:
On 8/18/2015 10:37 PM, Venkateswara Rao Dokku wrote:
Thanks for the reply. Sorry for the typo in the earlier mail. I have PV-HVM of CentOS 7 & I need to convert it to PV kernel.
Basically here I am trying to see whether my PV_HVM kernel is vulenrable to this issue given in the following link http://seclists.org/oss-sec/2015/q3/212
that is talking about a problem with QEMU and emulated cdroms, and as far as I can tell, the bug is in the qemu emulator, not in the VM's. it merely states that if you only use PV VM's you won't trigger the bug, but the correct fix is to update your QEMU so there is no bug.
In the above link, it was mentioned that the PV kernel is not vulnerable to
this bug, but HVM is. It didnt say anything about PV-HVM.
Can you please help me in this regard?
https://access.redhat.com/security/cve/CVE-2015-5154 suggests QEMU has been fixed as of July 27/28, at least for KVM servers, see the 4 RHSA Errata linked there.
again, RHEL7 and therefore CentOS 7 is all about KVM not Xen.
If you're running someone's xen server, you need to ensure its patched against this bug.
-- john r pierce, recycling bits in santa cruz
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
All modern kernels are PV compatible. You can take the same Linux image and run it HVM or PV.
On 19 August 2015 at 09:19, Venkateswara Rao Dokku dvrao.584@gmail.com wrote:
Thanks for the reply.
If we want to have PV kernel for CentOs 7 , are there any guidelines to follow? How we can know before hand itself that this kernel is PV or HVM, without installing kernel?
On Wed, Aug 19, 2015 at 11:27 AM, John R Pierce pierce@hogranch.com wrote:
On 8/18/2015 10:37 PM, Venkateswara Rao Dokku wrote:
Thanks for the reply. Sorry for the typo in the earlier mail. I have PV-HVM of CentOS 7 & I need to convert it to PV kernel.
Basically here I am trying to see whether my PV_HVM kernel is vulenrable to this issue given in the following link http://seclists.org/oss-sec/2015/q3/212
that is talking about a problem with QEMU and emulated cdroms, and as far as I can tell, the bug is in the qemu emulator, not in the VM's. it merely states that if you only use PV VM's you won't trigger the bug, but the correct fix is to update your QEMU so there is no bug.
In the above link, it was mentioned that the PV kernel is not vulnerable
to
this bug, but HVM is. It didnt say anything about PV-HVM.
Can you please help me in this regard?
https://access.redhat.com/security/cve/CVE-2015-5154 suggests QEMU has been fixed as of July 27/28, at least for KVM servers, see the 4 RHSA Errata linked there.
again, RHEL7 and therefore CentOS 7 is all about KVM not Xen.
If you're running someone's xen server, you need to ensure its patched against this bug.
-- john r pierce, recycling bits in santa cruz
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
-- Thanks & Regards, Venkateswara Rao Dokku. _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
I have taken the latest CentOS 7 base image, and after the installation & customization I came to know that it is HVM. So, I wanted to know before hand itself whether its HVM or PV. How can I do it? are there any specific steps we need to follow?
On Wed, Aug 19, 2015 at 11:57 AM, Andrew Holway andrew.holway@gmail.com wrote:
All modern kernels are PV compatible. You can take the same Linux image and run it HVM or PV.
On 19 August 2015 at 09:19, Venkateswara Rao Dokku dvrao.584@gmail.com wrote:
Thanks for the reply.
If we want to have PV kernel for CentOs 7 , are there any guidelines to follow? How we can know before hand itself that this kernel is PV or HVM, without installing kernel?
On Wed, Aug 19, 2015 at 11:27 AM, John R Pierce pierce@hogranch.com wrote:
On 8/18/2015 10:37 PM, Venkateswara Rao Dokku wrote:
Thanks for the reply. Sorry for the typo in the earlier mail. I have PV-HVM of CentOS 7 & I need to convert it to PV kernel.
Basically here I am trying to see whether my PV_HVM kernel is
vulenrable
to this issue given in the following link http://seclists.org/oss-sec/2015/q3/212
that is talking about a problem with QEMU and emulated cdroms, and as
far
as I can tell, the bug is in the qemu emulator, not in the VM's. it merely states that if you only use PV VM's you won't trigger the bug,
but
the correct fix is to update your QEMU so there is no bug.
In the above link, it was mentioned that the PV kernel is not
vulnerable
to
this bug, but HVM is. It didnt say anything about PV-HVM.
Can you please help me in this regard?
https://access.redhat.com/security/cve/CVE-2015-5154 suggests QEMU
has
been fixed as of July 27/28, at least for KVM servers, see the 4 RHSA Errata linked there.
again, RHEL7 and therefore CentOS 7 is all about KVM not Xen.
If you're running someone's xen server, you need to ensure its patched against this bug.
-- john r pierce, recycling bits in santa cruz
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
-- Thanks & Regards, Venkateswara Rao Dokku. _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
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Andrew Holway -
John R Pierce -
Venkateswara Rao Dokku