Please be aware this method is for advanced system admin users and we do support password auth for the initial adding of a standby node. Once the node is added the cluster will generate and configure key pairs itself.

1. On your main node generate a new ssh key that uses the ecdsa authentication method

ssh-keygen -t ecdsa
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This will prompt for a location and passphrase, as this key is only going to be used temporaraly, you can leave these blank/default.

1. Cat out the public key and copy the contents to a notepad file or similar

cat /root/.ssh/id_ecdsa.pub
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1. On the server that is being added as a standby node, add the public key to the deskpro_admin users authorized keys file

echo [public key] >> /home/deskpro_admin/.ssh/authorized_keys
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1. On the main node test the ssh connection works by trying to open a ssh tunnel using the generated key

ssh deskpro_admin@[ip address] -i /root/.ssh/id_ecdsa
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If the session connects correctly you can close the tunnel then add the node to the cluster/

1. To add the node to the cluster the command is:

opc cluster node add --ssh-host [ip address] --ssh-user deskpro_admin --ssh-key-path /root/.ssh/id_ecdsa
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1. Once the node has been added to the cluster you can check the status with

opc cluster node list
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1. Once everything is working correctly you can then remove the generated private key