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are appended to the Authorized_keys file, so masternode authorized_keys files contain the public key of all nodes:cat ~/.ssh/temp1 >> ~/.ssh/authorized_keyscat ~/.ssh/temp2 >> ~/.ssh/authorized_keysRM ~/.ssh/temp1RM ~/.ssh/temp2Distribute the merged Authorized_keys files to each node in the Masternode:SCP ~/.ssh/authorized_keys slavenode1:~/.ssh/SCP ~/.ssh/authorized_keys slavenode2:~/.ssh/Fourth Step: All system configuration/etc/ssh/sshd_config file, make the system use public key authenticat

1, create the dev group with the root permission to execute the groupadd command. sudo groupadd dev2, create bpuser user with adduser command,--ingroup specify user to join the dev group. sudo adduser bpuser--ingroup dev3, using Userdel to remove the user sudo userdel-r bpuser4,ubuntu default has sudo group, users added to this group can use the sudo command without entering a password. Add users to the sudo group: sudo usermod-ag sudo bpuser5, set a