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SSH without a password

You can login with password or with certificates. To generate certificates use this commands and accept all questions with enter:

This will generate a public and private certificate pair under ~/.ssh/ 

Now you can authorise a user with the gernated public certificates on other machines. You only need to copy the content from the public certificates to the other remote systems in this file~/.ssh/authorized_keys

For this purpose there is a special ssh tool:

Without that tool you can do it this way: