1. Generate Ssh Key And Add To Remote Server Download
  2. Generate Ssh Key And Add To Remote Server Ip
  3. Generate Ssh Key And Add To Remote Server List
How do I install my SSH public key ~/.ssh/id_rsa.pub onto a remote Linux and UNIX server automatically from Linux workstation or Apple OS X laptop without using scp and/or copy & paste method?
You need to use the ssh-copy-id script that uses ssh to log into a remote machine using a login password. The syntax is as follows:

Jun 22, 2012 The DigitalOcean control panel allows you to add public keys to your new Droplets when they’re created. You can generate the SSH Key in a convenient location, such as the computer, and then upload the public key to the SSH key section. Then, when you create a new Droplet, you can choose to include that public key on the server. Jul 29, 2019 Establishing an SSH (Secure Shell) connection is essential to log in and effectively manage a remote server. Encrypted keys are a set of access credentials used to establish a secure connection. This guide will walk you how to generate SSH keys on Ubuntu 18.04.

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ssh-copy-id user@server.example.com[donotprint][/donotprint]

OR

ssh-copy-id -i ~/.ssh/id_rsa.pub user@server1.cyberciti.biz

OR

ssh-copy-id -i ~/.ssh/id_dsa.pub user@server1.cyberciti.biz

OR use specific port on remote host such as tcp port # 4242:

ssh-copy-id -i /path/key/file.pub 'user@server.example.com -p 4242'

Install ssh-copy-id on a OS X Unix systems

Type the following command:

Sample outputs:

Step # 1: Create the Keys

Type the following ssh-keygen command to generates, manages and converts authentication keys for your workstation / laptop:
ssh-keygen
Make sure you protect keys with the passphrase.

Step # 2: Install the public key

Install key in a remote server called www-03.nixcraft.in, enter:
ssh-copy-id -i ~/.ssh/id_rsa.pub username@www-03.nixcraft.in

Note: If ssh-copy-id command not found on your system, try the following commands to append/install the public key on remote host:
ssh username@www-03.nixcraft.in 'umask 077; mkdir .ssh'
cat $HOME/.ssh/id_rsa.pub ssh username@www-03.nixcraft.in 'cat >> .ssh/authorized_keys'

Step #3: Use keychain for password less login

OpenSSH offers RSA and DSA authentication to remote systems without supplying a password. keychain is a special bash script designed to make key-based authentication incredibly convenient and flexible (see how to install keychain script on unix). Add following lines to your ~/.bash_profile or shell login file:

Save and close the file.

References:
  • Man pages – ssh-copy-id(1)

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Create the RSA Key Pair

Store the Keys and Passphrase

Once you have entered the Gen Key command, you will get a few more questions:

You can press enter here, saving the file to the user home (in this case, my example user is called demo).

It's up to you whether you want to use a passphrase.

Generate Ssh Key And Add To Remote Server Download

Entering a passphrase does have its benefits: the security of a key, no matter how encrypted, still depends on the fact that it is not visible to anyone else. Should a passphrase-protected private key fall into an unauthorized users possession, they will be unable to log in to its associated accounts until they figure out the passphrase, buying the hacked user some extra time. The only downside, of course, to having a passphrase, is then having to type it in each time you use the Key Pair.

The entire key generation process looks like this:

The public key is now located in /home/demo/.ssh/id_rsa.pub

The private key (identification) is now located in /home/demo/.ssh/id_rsa

Copy the Public Key

Once the key pair is generated, it's time to place the public key on the virtual server that we want to use.

Azure generate storage account key password. The key is auto-generated and serves as a password, rather than an as a cryptographic key. Key Vault manages storage account keys by storing them as Key Vault secrets. You can use the Key Vault managed storage account key feature to list (sync) keys with an Azure storage account, and regenerate (rotate) the keys periodically.

You can copy the public key into the new machine's authorized_keys file with the ssh-copy-id command. Make sureto replace the example username and IP address below.

Alternatively, you can paste in the keys using SSH:

No matter which command you chose, you should see something like:

Now try logging into the machine, with:

and check in:

to make sure we haven't added extra keys that you weren't expecting.

Now you can go ahead and log into user@12.34.56.78 and you will not be prompted for a password. However, if you set a passphrase, you will be asked to enter the passphrase at that time (and whenever else you log in in the future).

Disable the Password for Root Login

Once you have copied your SSH keys unto your server and ensured that you can log in with the SSH keys alone, you can go ahead and restrict the root login to only be permitted via SSH keys.

In order to do this, open up the SSH config file:

Generate Ssh Key And Add To Remote Server Ip

Within that file, find the line that includes PermitRootLogin and modify it to ensure that users can only connect with their SSH key:

Generate Ssh Key And Add To Remote Server List

Put the changes into effect: