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Nice that nobody is answering this.... I have the similar problem.

I even tried to restore configuration: tar -xvf /root/etc_pve.tar -C /etc/pve But failed: etc/pve/ etc/pve/.debug tar: etc/pve/.debug: Cannot change ownership to uid 0, gid 33: Function not implemented tar: etc/pve/.debug: Cannot change mode to rw-r-----: Function not implemented etc/pve/local...

It`s messed up... situation is critical :( I still have the VM's running, but the web GUI does not work at all... don't know what to do :(

Well I failed, I tried to add server B (empty), but something failed and now I cannot retry anymore: can't create shared ssh key database '/etc/pve/priv/authorized_keys' cluster not ready - no quorum? unable to add node: command failed (ssh xx.xx.xxx.xx -o BatchMode=yes pvecm addnode ns395767...

UPDATE: after running this: wget -O- "http://download.proxmox.com/debian/key.asc" | apt-key add - apt-get update && apt-get dist-upgrade Update went fine, and now I have same proxmox version on server A and B :) I will start clustering!

If I click on server A "package versions", I get this: proxmox-ve: 4.3-66 (running kernel: 4.4.19-1-pve) pve-manager: not correctly installed (running version: 4.3-1/e7cdc165) pve-kernel-4.2.8-1-pve: 4.2.8-41 pve-kernel-4.4.19-1-pve: 4.4.19-66 lvm2: 2.02.116-pve3 corosync-pve: not correctly...

Thank you, by the way is vlan really needed ? Many videos and tutorials show usage of vlan, but my current situation... cannot do that.

I understand, thank you for answering. Amazing forum an people around here. But I am still afraid to do this :( Because if I do something wrong, and my customers are affected... then I don't see a "way out" of this. In the same time, I am "forced" to do clustering...

Following this tutorial: https://pve.proxmox.com/wiki/Proxmox_VE_4.x_Cluster I am afraid of this warning: WARNING: Adding a node to the cluster will delete it's current /etc/pve/storage.cfg. If you have VMs stored on the node, be prepared to add back your storage locations if necessary. Even...

@dietmar Thank you, but I don`t know how to update server A to be exactly like server B without downtime... ( sorry, I`m new to proxmox ) @udo Thank you, I will try to do this.

Yes, thank you for your reply. That`s exactly my plan, although I have never setup clustering with Proxmox before... if I by some any chance loose the VM's or they stop or whatever... can I "fix" them ? Server A has 20+ VM's running at the moment and Server B is completely empty. PS: My server...

I already searched on Google quite some time about this, but I cannot get a guaranteed answer. Please advise...

I am facing a hard dilemma here. I am running Proxmox 4.x with vm's on it, and it's reaching the resource limits, so I want to setup clustering. I have setup another server with the same Proxmox 4.x ( but no vm's, just empty ) and I would like to add it to my primary one that is currently...