Use Proxmox basically with 2 nodes and DRBD (without HA)...

Dubard

Active Member
Oct 5, 2016
61
2
28
47
Switzerland
Hello everybody,
I'm newbie to Proxmox.
I only have 2 servers to mount my Proxmox platform (i do not need the HA).
I installed the Proxmox distribution (Virtual Environment 4.4-5 / c43015a5) on these 2 servers and I use DRBD as storage space. I managed to create some VMs (LXC, KVM) and run them. I found, however, the following:

1) When I stop one of the nodes and I restart it, all the machines of it does not start !
if I try to migrate the machines, from the interface, from the primary node (node1) to the secondary (node2) it does not start! DRBD indicates:
<code>
root@node1:~# drbd-overview
102: vm-102-disk-1/0 Connected (2 *) Secondary (2 *) UpToDa / UpToDa
</code>


... the disk does not appear on the secondary node (node2) in "/dev/drbd/by-res /" and that's why it does not start !
Also, if Indeed, I was forced to do this with DRBD to restart the machines:

For example for vm-102:

  • On the secondary node (where the machines were not active):
<code>
root@node2:~# drbdadm disconnect vm-102-disk-1
root@node2:~# drbdadm secondary vm-102-disk-1
root@node2:~# drbdadm connect --discard-my-data vm-102-disk-1
</code>


  • On the primary node (where the machines were operating):
<code>
root@node1:~# drbdadm disconnect vm-102-disk-1
root@node1:~# drbdadm connect vm-102-disk-1
root@node1:~# /etc/init.d/drbd restart
[ ok ] Restarting drbd (via systemctl): drbd.service.
root@node1:~#
</code>


I saw that on the site of Linbit (DRBD) it was necessary to install the plugin "drbdmanage-proxmox".
I had not done this before because I used "drbdmanage", available from Debian repositories.

What does this plugin add?
Is that why I have these problems mentioned ?

2) If I want to use the Ceph storage space, does it work with only 2 servers ?

With my thanks and best regards
 

About

The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get yours easily in our online shop.

Buy now!