Hi,
Suppose I have already installed Sle Micro on three servers using Elemental.
Now I want to add an ssh key.
How can I do it? If I update the registration endpoint I suppose the machines are not updated.
Do I need to reinstall the servers?
Thanks in advance,
Mario
SL Micro with Elemental is following cloud-native semantics. It’s immutable with a declarative configuration and must be treated as “cattle” instead of “pet”. If cattle is sick, you just get a new one 
Configuration is controlled via the respective MachineRegistration.
In order to change the configuration (like adding an ssh key), you need to change the MachineRegistration and reset the node to let it pick up the new configuration.