The post list out the steps to setup ssh keys to configure passwordless ssh in Linux. ssh-keygen is the command used to generate the public and private keys if you have not done it already. With ssh-copy-id command, we can copy the keys to the destination server to which we want to have a passwordless ssh setup.
1. Login as the user that you want to setup the ssh keys. In this case, we are using user sandy.
Generate keys with ssh-keygen. To create the keys, a preferred command is ssh-keygen, which is available with OpenSSH utilities in the Azure Cloud Shell, a macOS or Linux host, the Windows Subsystem for Linux, and other tools. Ssh-keygen asks a series of questions and then writes a private key and a matching public key.
Generate Ssh Key Github
2. Create a private and public key for the user sandy. Press enter twice when asked for the passphrase as we are going to keep the passphrase empty.
Note: You can specify an option on the ssh-keygen like the size and the type . You can find more information on the man page of ssh-keygen command
From the man page of ssh-keygen :
3. New Keys will be located on /home/test1/.ssh. Move to your .ssh directory were the key was created check for the public
Generate Ssh Key Aix
4.Copy the public key to the target server.
Verify
1. Now try logging into the machine, with “ssh ‘test1@lab02′”, and check the file ~/.ssh/authorized_keys to make sure we haven’t added extra keys that you weren’t expecting.
2. Test your key, you should login directly your target server without it asking for a password.
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alternate method if ssh-copy-id command is not available
Linux Create Ssh Key Pair
If your server does not have the openssh-clients package installed, you can use an alternate method. You can directly copy the public key using the scp command.