Before setup mirroring database, its important to setup public key authentication. All nodes can connect to each other via this IP without password promt with user root.
OS : Centos 7
IP master : 192.168.11.9
IP slace : 192.168.11.10
1. the first we check the IP
# ip a
2. For root, we need to generate a new RSA-keypair foll all nodes
# ssh-keygen
3. Change user permission and then move to directory ~/.ssh
# mkdir -p ~/.ssh
#chmod 700 ~/.ssh
#cd ~/.ssh/
4. Make sure there id_rsa.pub from generate RSA-keypar in step 1.
# ls
#cat id_rsa.pub
5. To allow all node to connect to each other and accept each other’s key, we need to add the generate public keys of all host to /root/.ssh/authorized_keys. Follow this commend below
#nano /root/.ssh/authorized_keys
#chmod 600 ~/.ssh/authorized_keys
#chmod 600 ~/.ssh/authorized_keys
6. Then add all hosts to known_hosts file
#ssh-keyscan -H {192.168.11.9,192.168.11.10}|sudo tee /root/.ssh/known_hosts
7. After that, transfer authorized_keys to other node
# sudo scp /root/.ssh/{authorized_keys,known_hosts} 192.168.11.10:/root/.ssh
8. Check ssh other node. If you can ssh without password, your succes setup the public key authentication
