So my question was if you are using PV (para-virtualized) or HVM (hardware
assisted virtualization).

(and you can run OpenStack with many different underlying virtualization
systems).

On Fri, Aug 30, 2019, 11:38 Matt Faraday <matt.fara...@gmail.com> wrote:

> Hi
>
> It's openstack, so KVM.
> These are VMs.
>
>
>
> On Thursday, 29 August 2019 22:57:28 UTC+1, Rickard von Essen wrote:
>>
>> Could you provide some more details? What's the underlying virtualization
>> system? Is this PV or HVM VM's? Etc
>>
>> On Thu, Aug 29, 2019, 19:34 Matt Faraday <matt....@gmail.com> wrote:
>>
>>> Hi All,
>>>
>>> I'm facing a strange issue, where I've modified /etc/default/grub in my
>>> image to change GRUB_CMDLINE_LINUX to add some extra flags. If I do this to
>>> an already running instance, it's fine, a reboot and the changes persist.
>>>
>>> I'm creating images using packer, and if I make this change when
>>> creating an image, when the instance starts those changes are not there,
>>> despite packer making the change and then creating the image.
>>>
>>> Any idea what is over-writing this ? Can't seem to find any info online,
>>> and other people suggest making changes to the kernel boot parameters in
>>> the same way as I'm doing. I am also running grub2-mkconfig -o
>>> /boot/grub2/grub.cfg as well after making the change.
>>>
>>> OS is CentOS 7.
>>>
>>> Example output from packer (it does a cat /etc/default/grub for me to
>>> show what it is)
>>>
>>> [0;32m openstack: GRUB_TIMEOUT=1 [0m
>>> [0;32m openstack: GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g'
>>> /etc/system-release)" [0m
>>> [0;32m openstack: GRUB_DEFAULT=saved [0m
>>> [0;32m openstack: GRUB_DISABLE_SUBMENU=true [0m
>>> [0;32m openstack: GRUB_TERMINAL="serial console" [0m
>>> [0;32m openstack: GRUB_SERIAL_COMMAND="serial --speed=115200" [0m
>>> [0;32m openstack: GRUB_CMDLINE_LINUX="console=tty0 crashkernel=auto
>>> console=ttyS0,115200 net.ifnames=0 biosdevname=0 audit=1"
>>>
>>> but after starting the image ....
>>>
>>> [root@kernel4-nic-test-2471ee92 cloud]# cat /etc/default/grub
>>>
>>> GRUB_TIMEOUT=1
>>> GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
>>> GRUB_DEFAULT=saved
>>> GRUB_DISABLE_SUBMENU=true
>>> GRUB_TERMINAL="serial console"
>>> GRUB_SERIAL_COMMAND="serial --speed=115200"
>>> GRUB_CMDLINE_LINUX="console=tty0 crashkernel=auto console=ttyS0,115200"
>>>
>>>
>>> Does anyone know what is overwriting this ?
>>>
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