[SOLVED] Network problems with host & guest with subnet (Hetzner root)

[Spacey]

Hi all,

sorry but I already checked out several threads & "wasted" hours with no success so I'm trying it here and I guess you experts can give me a simple & quick solution.

I've got an older rootserver @ Hetzner and used there an pre-configures proxmox 2 debian wheezy installation where it works very well and easy to implement a /29 subnet. I just add a new VM and in the network config screen I enter the new subnet IP in the "Routed mode (venet)" field - est voila, everyting works.



#net.ipv4.ip_forward=1 is commented out - on the "old" server as well as on the new one ->

Now Hetzner got an new Proxmox 4 Debian Jessie image as well and I used for example this tutorial to get it up and running - checked for example lot's of documents like this or that -> I can access the proxmox server itself very well and work there but I can't get no debian 8 guest up regarding the network settings. The guest vm network dialogue is completely different - the whole mechanism seems different with bridge & bond.

My very simple question is what to do and where to get it working?!

I've got a rootserver with an own IP (proxmox is reachable as said) and a /29 subnet for the VMs.

pveversion --verbose
proxmox-ve: 4.2-58 (running kernel: 4.4.13-2-pve)
pve-manager: 4.2-17 (running version: 4.2-17/e1400248)
pve-kernel-4.4.13-2-pve: 4.4.13-58
pve-kernel-2.6.32-39-pve: 2.6.32-157
pve-kernel-2.6.32-46-pve: 2.6.32-177
lvm2: 2.02.116-pve2
corosync-pve: 2.4.0-1
libqb0: 1.0-1
pve-cluster: 4.0-43
qemu-server: 4.0-85
pve-firmware: 1.1-8
libpve-common-perl: 4.0-71
libpve-access-control: 4.0-18
libpve-storage-perl: 4.0-56
pve-libspice-server1: 0.12.8-1
vncterm: 1.2-1
pve-qemu-kvm: 2.6-1
pve-container: 1.0-71
pve-firewall: 2.0-29
pve-ha-manager: 1.0-33
ksm-control-daemon: not correctly installed
glusterfs-client: 3.5.2-2+deb8u2
lxc-pve: 1.1.5-7
lxcfs: 2.0.0-pve2
cgmanager: 0.39-pve1
criu: 1.6.0-1

uname -a
Linux server5 4.4.13-2-pve #1 SMP Fri Jul 15 06:36:47 CEST 2016 x86_64 GNU/Linux

Thanks a lot!

 

[Spacey]

After hours of trying I'm a bit further: Re-trying http://tj.mk/install-proxmox-4-hetzner-debian/ this tutorial brought at least the effect that I can ping the debian 8 guest and when I try to ssh I get the login prompt. Unfortunately it won't accept the password I entered during the guest creation. I can't use the vnc console within proxmox...

 

[Spacey]

And the solution to this is:

The proxmox debian minimal install image has the "PermitRootLogin without-password" option enabled within the bundled sshd_config so you can't just ssh into your freshly new created VM - stupid, eh?!

To change this: On your proxmox host enter ssh - there:

1) pct list

This lists all your created guests.

2) pct enter ###

### is of course the number of your guest. So you're not in your guest and can now for example edit your /etc/ssh/sshd_config regarding this without-password-stuff to "yes".

Later on of course please work with ssh keys and re-set this to without-password for security reasons.

But this as a standard behaviour is imho not very good.