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What is the root password before the node is joined to the cluster

We setup 3 nodes cluster and set all the nodes to jumbo frame.  One of the node is dead, we reloaded it from scratch.  When trying to join the new node back to the cluster, it errors out.  I think that is the problem with the NIC frame size mismatch.  We ran in to the same trouble when forming the cluster if the first node is set to jumbo frame and the second node couldn't add to the cluster because the default frame size is 1500.  Since the cluster is already set to jumbo frame, but the new node is not jumbo frame enabled, I need to find a way to set the jumbo frame on the new node before I join it to the cluster.  However, when the node is not in the cluster yet, I can't use the cluster password to sign in to the root account at the console.  Is there a default root account password before the node is in the cluster?

I believe we dis-allow selecting jumbo frames on the management interface you can specify vlans and bonds for management nic but not jumbo frames, i believe for the same reason you describe.

You can however access the node: a non deployed node will not have a root password set (you cannot log in/ssh) but will display an extra menu in the blue console menu to access the shell,  which you can use directly or set a temp password via passwd command.

 

Question to admins: Let's say I have two network cards assembled in a bond, and over this bond I have 2 VLAN, one for managment and one for backbone. I want backbone vlan with MTU 9000.

How to do this?

P.S. Anycase - installing node on raw ethernet and switch network configuration to "bond with this nic" - it's a bad idea. I really expect that it will be possible to install bonding at the time the node is installed. Now I had to kill our NOC (joke) in order for the network to work both immediately after installation and during the connection of the node to the cluster and after that.

The limitation we have, you cannot add jumbo frames on the management interface, aside from this we support any combinations of mtu/bonds/vlans.

if you need to add jumbo frames to your backend network, use a separate interface for management. 1 Gbps interface is enough.

BTW, if the cluster has lost connection in the management network - will part of the CEPH be available and continue to work without problems?

yes, Ceph is on the backend network, management is for web ui.

Ok. Thank you very much for your support.