mutual ssh access without a password
Proceed as follows:
Example: A machine from accessing machine B without a password.
A: implementation of the above
#ssh-keygen -t rsa
Generates two files: /root/.ssh/id_rsa.pub public and /root/.ssh/id_rsa
Private key.
#chmod 755 /root/.ssh/
#scp /root/.ssh/id_rsa.pub B:/root/.ssh/authorized_keys
A machine then you can not have a password to access B.
Reproduced in: https: //www.cnblogs.com/licheng/archive/2010/12/29/1920917.html