Re: [CentOS-virt] custom Xen on custom kernel on CentOS 7

2018-02-28 Thread John Vetter 
Yes, the binaries were correctly installed in /boot, but grub2-mkconfig wasn't 
creating an entry in grub.cfg for the particular combination of linux kernel 
and xen that I was looking for. Manually editing the grub.cfg appeared to work 
okay, but it was a pain because it gets over-written everytime grub2-mkconfig 
gets run.

Thanks George,
John
 
 

Sent: Wednesday, February 28, 2018 at 7:05 AM
From: "George Dunlap" <dunl...@umich.edu>
To: "Discussion about the virtualization on CentOS" <centos-virt@centos.org>
Subject: Re: [CentOS-virt] custom Xen on custom kernel on CentOS 7


On systems with grub2, grub-bootxen.sh is tweaking the global grub2
config -- making sure Xen runs first, and adding some default
configuration. Even without that, grub2-mkconfig should be creating
entries if the binaries exist.

Are you sure:
1. That your new kernel & hypervisor have installed binaries in /boot?
2. That grub2-mkconfig is writing the config to the proper directory?
(i.e., that, you're using the correct '-o' argument?)

-George
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Re: [CentOS-virt] custom Xen on custom kernel on CentOS 7

2018-02-28 Thread John Vetter 
Thanks Sarah. Your suggestions 2) and 3) appear to have solved my problem.

John
 
 

Sent: Tuesday, February 27, 2018 at 12:48 PM
From: "Sarah Newman" <s...@prgmr.com>
To: "John Vetter" <john.vet...@mail.com>
Cc: "Discussion about the virtualization on CentOS" <centos-virt@centos.org>
Subject: Re: [CentOS-virt] custom Xen on custom kernel on CentOS 7
On 02/27/2018 07:50 AM, John Vetter wrote:
> Hi,
> I'm trying to run an arbitrary Xen version (4.7.x) on a recent kernel (say,
> 4.13.x) on CentOS 7.
> What is the recommended way for doing this? (I am new to Xen and 
> virtualization).
> I tried the following:
> 1. installed xen4centos.
> 2. built linux kernel 4.13.x and installed it (using make install)
> 3. built xen 4.7.x and installed it (using make install).
> grub2-mkconfig and grub-bootxen.sh don't seem to be picking up the combination
> of new kernel and new xen and making an entry in the grub.cfg file.
> It did make an entry for the new Xen with the kernel installed with 
> xen4centos.
> I looked at the grub-bootxen.sh script but was unable to figure a way out. How
> do I get the installation scripts to make an entry for my new kernel and new 
> Xen?

I would suggest one of
1. Run the scripts with -x to figure out where they're quitting early
2. Make an rpm for the kernel you're building, or
3. Manually edit the grub files and run dracut. It's not hard to do what those 
scripts do by hand.

--Sarah
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Re: [CentOS-virt] custom Xen on custom kernel on CentOS 7

2018-02-28 Thread George Dunlap 
On Tue, Feb 27, 2018 at 3:50 PM, John Vetter  wrote:
> Hi,
>
> I'm trying to run an arbitrary Xen version (4.7.x) on a recent kernel (say,
> 4.13.x) on CentOS 7.
>
> What is the recommended way for doing this? (I am new to Xen and
> virtualization).
>
> I tried the following:
> 1. installed xen4centos.
> 2. built linux kernel 4.13.x and installed it (using make install)
> 3. built xen 4.7.x and installed it (using make install).
>
> grub2-mkconfig and grub-bootxen.sh don't seem to be picking up the
> combination of new kernel and new xen and making an entry in the grub.cfg
> file.

On systems with grub2, grub-bootxen.sh is tweaking the global grub2
config -- making sure Xen runs first, and adding some default
configuration.  Even without that, grub2-mkconfig should be creating
entries if the binaries exist.

Are you sure:
1. That your new kernel & hypervisor have installed binaries in /boot?
2. That grub2-mkconfig is writing the config to the proper directory?
(i.e., that, you're using the correct '-o' argument?)

 -George
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Re: [CentOS-virt] custom Xen on custom kernel on CentOS 7

2018-02-27 Thread Sarah Newman 
On 02/27/2018 07:50 AM, John Vetter wrote:
> Hi,
> I'm trying to run an arbitrary Xen version (4.7.x) on a recent kernel (say, 
> 4.13.x) on CentOS 7.
> What is the recommended way for doing this? (I am new to Xen and 
> virtualization).
> I tried the following:
> 1. installed xen4centos.
> 2. built linux kernel 4.13.x and installed it (using make install)
> 3. built xen 4.7.x and installed it (using make install).
> grub2-mkconfig and grub-bootxen.sh don't seem to be picking up the 
> combination 
> of new kernel and new xen and making an entry in the grub.cfg file.
> It did make an entry for the new Xen with the kernel installed with 
> xen4centos.
> I looked at the grub-bootxen.sh script but was unable to figure a way out. 
> How 
> do I get the installation scripts to make an entry for my new kernel and new 
> Xen?

I would suggest one of
1. Run the scripts with -x to figure out where they're quitting early
2. Make an rpm for the kernel you're building, or
3. Manually edit the grub files and run dracut. It's not hard to do what those 
scripts do by hand.

--Sarah
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Re: [CentOS-virt] custom Xen on custom kernel on CentOS 7

2018-02-27 Thread John Vetter 

Sorry reseding in text format.
 

Hi,
 
I'm trying to run an arbitrary Xen version (4.7.x) on a recent kernel (say, 
4.13.x) on CentOS 7.
 
What is the recommended way for doing this? (I am new to Xen and 
virtualization).
 
I tried the following:
1. installed xen4centos.
2. built linux kernel 4.13.x and installed it (using make install)
3. built xen 4.7.x and installed it (using make install).
 
grub2-mkconfig and grub-bootxen.sh don't seem to be picking up the combination 
of new kernel and new xen and making an entry in the grub.cfg file.
 
It did make an entry for the new Xen with the kernel installed with xen4centos.
 
I looked at the grub-bootxen.sh script but was unable to figure a way out. How 
do I get the installation scripts to make an entry for my new kernel and new 
Xen?
 
Thanks,
John
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[CentOS-virt] custom Xen on custom kernel on CentOS 7

2018-02-27 Thread John Vetter 
Hi,

 

I'm trying to run an arbitrary Xen version (4.7.x) on a recent kernel (say, 4.13.x) on CentOS 7.

 

What is the recommended way for doing this? (I am new to Xen and virtualization).

 

I tried the following:

1. installed xen4centos.

2. built linux kernel 4.13.x and installed it (using make install)

3. built xen 4.7.x and installed it (using make install).

 

grub2-mkconfig and grub-bootxen.sh don't seem to be picking up the combination of new kernel and new xen and making an entry in the grub.cfg file.

 

It did make an entry for the new Xen with the kernel installed with xen4centos.

 

I looked at the grub-bootxen.sh script but was unable to figure a way out. How do I get the installation scripts to make an entry for my new kernel and new Xen?

 

Thanks,

John
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