Re: nvmm users - experience

[Matthias Petermann <mp%petermann-it.de@localhost>]

Hello everyone,

as a follow-up to yesterdays coversation, I've uploaded the script to my 
private Git in case anyone wants to take a look at it.

It consists of the actual tool itself and an rc-script that supports 
start/stop functionality during system boot-up and shutdown. The 
configuration of the VMs needs to be provided in a (hard-coded) conf.d 
directory.

However, I want to mention upfront that it was put together hastily and 
only meets the minimum requirements. Nevertheless, it might serve as 
inspiration for more sophisticated tooling in the future.

Kind regards
Matthias

[1] https://forge.petermann-it.de/mpeterma/vmctl

On 23.05.23 16:38, Matthias Petermann wrote:
> Hi Robert,
>
> On 23.05.23 15:51, Robert Nestor wrote:
>
> > Commenting on your follow-up on Xen startup and how I considered doing 
> > this in NVMM.  I have a rudamentory script that I use to define/create 
> > guest systems which also includes some hooks for starting up guest 
> > systems. There’s not currently any way I found in NVMM to send in 
> > shutdown commands or instructions though which seem to be available in 
> > Xen and KVM.  I did put hooks in my script to backup and restore guest 
> > systems.
>
> Assuming you are using Qemu as the frontend to nvmm you can redirect 
> Qemus "monitor" console to a Unix domain socket.
>
> I use this command in my scripts:
>
> ```
>   MONITOR_SOCKET=/tmp/$VM_ID.monitor
>   CONSOLE_SOCKET=/tmp/$VM_ID.console
>
>   nohup qemu-system-x86_64 -name $VM_ID -machine pc-q35-7.0 -smp 
> $VM_CORES -m $VM_RAM -accel nvmm \
>                          -device virtio-balloon-pci,id=balloon0 \
>                          -k de -boot cd -cdrom $VM_CDROM \
>                          -machine graphics=off -display none -vga none \
>                          -object 
> rng-random,filename=/dev/urandom,id=viornd0 \
>                          -device virtio-rng-pci,rng=viornd0 \
>                          -object iothread,id=t0 \
>                          $BLK \
>                          -device virtio-net-pci,netdev=vioif0,mac=$VM_MAC \
>                          -netdev 
> tap,id=vioif0,ifname=$VM_NETIF,script=no,downscript=no \
>                          -chardev 
> socket,id=monitor,path=$MONITOR_SOCKET,server=on,wait=off \
>                          -monitor chardev:monitor \
>                          -chardev 
> socket,id=serial0,path=$CONSOLE_SOCKET,server=on,wait=off \
>                          -serial chardev:serial0 \
>                          -pidfile /tmp/$VM_ID.pid \
>                          2>&1 | logger -p local0.notice &
> ```
>
> Shutdown is possible by sendung the system_powerdown qemu monitor command:
>
> ```
> MONITOR_SOCKET=/tmp/$VM_ID.monitor
> echo "system_powerdown" | nc -N -U $MONITOR_SOCKET
> echo ""
> ```
>
> On my systems this result in an ACPI poweroff event which triggers the 
> shutdown procedure in the NetBSD guest.
>
> Kind regards
> Matthias

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