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[linux] Linux Secretless Login (ssh) or Secretless Copy (scp) files to other servers

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Posted on 2/17/2022 11:17:27 AM | | | |
Requirements: There are two servers, A (10.7.45.131) and B (10.7.45.132), in order to enable server A to log in passwordlessly when connecting to server B via SSH, or copy server A files to server B through the scp command.

The tutorial is as follows:

1. Log in to server A and run the following command to generate a pair of ssh public and private key files, as follows:



Under the ~/.ssh/ directory, two files will be generated, id_rsa (private key) id_rsa.pub (public key), as shown in the figure below:

2. Use the ssh-copy-id command to copy or upload the public key to the remote host (perform the upload from server A to server B) with the following command:

As shown below:



ssh-copy-id command to copy the local host's public key to the remote host's authorized_keys file,
The ssh-copy-id command also sets the appropriate permissions for the remote host's home directory (home) and ~/.ssh, and ~/.ssh/authorized_keys.
The ssh-copy-id command can install the local ssh public key file to the account corresponding to the remote host.
Log in to server B, look at the /root/.ssh folder, and find that the authorized_keys file is generated, as shown in the figure below:







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