[SOLVED] Proxmox inside Proxmox?

[Fred Saunier]

Hi all,

This used to be a non-issue, only this time around with proxmox 6.2, things are not so straight (at least for me).

I need to install Proxmox 6.2 as a VM inside a Promox 6.2 hypervisor, to run a series of tests. I cannot seem to get a network connection. In the past, I did this a number of times with proxmox 4.4, and it was easy as 1-2-3. Today, I can find "Proxmox inside VirtualBox" in the wiki, but nothing relative to "Proxmox inside Proxmox". No network, the thing cannot even ping itself.

I tried VirtIO network and Intel e1000, to no avail.

Any pointers most welcome

Fred

 

[Stoiko Ivanov]

Inside the VM - what's the output of:

ip link
ip addr
ip route
ping $gateway

(where you replace $gateway by your gateway ip)

What's the VM config of the PVE guest?

 

[Fred Saunier]

I'll have to post screenshots, as I cannot copy from console



vm config:
agent: 1
bootdisk: scsi0
cores: 4
ide2: none,media=cdrom
kvm: 0
memory: 8192
name: px-test1
net0: virtio=E2:76:96:A5:13:F0,bridge=vmbr0,tag=10
numa: 0
ostype: l26
scsi0: POOL_HDD:vm-5001-disk-0,backup=0,cache=writeback,discard=on,size=100G
scsihw: virtio-scsi-pci
smbios1: uuid=0a8d54f2-8614-4837-ae0a-dc4cd6f0f323
sockets: 2
vga: qxl
vmgenid: 91cc96a5-f549-414c-806a-f025cc379512

 

[Stoiko Ivanov]

The network config looks ok - is 192.168.10.1 reachable in vlan 10 from the vmbr0 of the physical (outside) PVE-host?

 

[Fred Saunier]

The network config looks ok - is 192.168.10.1 reachable in vlan 10 from the vmbr0 of the physical (outside) PVE-host?

Yes, the hypervisor can reach the gateway, no problem

 

[Stoiko Ivanov]

Yes, the hypervisor can reach the gateway, no problem

In vlan 10?
else - I would suggest to start checking with tcpdump where the packets get lost

 

[Fred Saunier]

In vlan 10?
else - I would suggest to start checking with tcpdump where the packets get lost

I just spun a live Ubuntu on the same hypervisor, in VLAN 10 -- it is getting an IP from the dhcp, and can go out through the vlan gateway. So my little LAB VLAN looks okay.

I'll get a new copy of the iso, and re-install proxmox and see what it says.

 

[Fred Saunier]

Found the cause of the issue. Turns out I had set KVM hardware virtualization to no. Setting it back to yes allows network connections.

I thought I remembered from the past that KVM hardware virtualization has to be set to no for nested pve, but I remembered wrong. It can be set to yes, then nested vms inside the virtualized pve have the option set to no.

Now it works.

 

[Stoiko Ivanov]

Glad you resolved your issue - still seems a bit odd that kvm should change the way the network devices work - but if it works now

regarding nested virtualization - this can be tricky in clustered setups (migrating guests which are hypervisors themselves does not work reliably) - but you need to make sure that the nesting option of the respective kvm kernel module is enabled:
https://pve.proxmox.com/wiki/Nested_Virtualization