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Follow these steps to add your public SSH key to the Platform using the Studio: Log into the Studio. Click on the portrait button located on the top right of the screen. Select Settings. Select SSH Key Management. A list of previously uploaded SSH Keys will be displayed. Select Add New Key. Paste your public key into the Public Key field.

am a new RHEL 8 server sysadmin. How do I configure SSH public key-based authentication for RHEL (Red Hat Enterprise Linux) 8 server?
Introduction

1. Run the following command to create an RSA type SSH key, which generates both a public and a private key: Remember where you generated these files, as you must recall their paths during the CDS configuration. Additionally, you must copy the generated private key called idrsa to each of the CDS server instances.
2. Nov 10, 2011  How to Generate A Public/Private SSH Key Linux By Damien – Posted on Nov 10, 2011 Nov 18, 2011 in Linux If you are using SSH frequently to connect to a remote host, one of the way to secure the connection is to use a public/private SSH key so no password is transmitted over the network and it can prevent against brute force attack.

– SSH is an acronym for secure shell. It is a suite of cryptographic network protocol. It allows users to log in and transfer files securely over the unsecure network such as the Internet. OpenSSH is an implementation of SSH protocol on RHEL 8. You can log in using RHEL 8 user and password account. However, OpenSSH project recommends log in using a combination of a private and public SSH keys.

Sample set up for our RHEL 8 server

Where,

• You generate a key pair on your Linux/Unix/macOS desktop.
• Place the public key on RHEL 8 server.
• One can unlock public key using a private key stored on your desktop with the help of ssh command.
• When both the public and private key correct you can log in without a password.

How do I set up SSH keys on RHEL 8 server?

The procedure to set up SSH key on Red Hat Enteprise Linux 8 server:

Using Public-Key Authentication in Secure Shell ApplicationsThe tip below provides a basic overview of public-key authentication, explains how to generate and upload keys to the Secure Shell server, and shows how to configure SecureCRT and SecureFX clients.Overview of public-key authentication for Secure ShellPublic-key authentication is a proven, well-established method for authenticating computing devices which is more secure than password authentication. Securecrt 8.1 license key generatorey generator. The public and private keys are generated with a key generation utility. Public-key authentication employs a linked pair of computer-generated keys — one public and one private — and a procedure that proves the user's identity without exposing the secret key to theft or hijacking.Before using public-key authentication, the public/private key pair files must be created, with a copy of the public-key file being uploaded to a specific location on the server.

1. On your local desktop type:
   ssh-keygen
2. Install public key into remote RHEL 8 server using:
   ssh-copy-id user@remote-RHEL8-server-ip
3. Use ssh for password less login:
   ssh user@remote-RHEL8-server-ip

Let us see all commands and steps in details.

How to create the ed25519 or RSA key pair

The syntax is:
ssh-keygen -t ed25519
ssh-keygen -t rsa
ssh-keygen -t rsa -b 4096 -f ~/.ssh/aws-lighsail.key -C 'My AWS SSH Keys'
ssh-keygen -t ed25519 -f ~/.ssh/linode-usa-www1-vps.key -C 'My Linode SSH Keys for www'
Where,

• -t rsa OR -t ed25519 : Specifies the type of key to create. The possible values “dsa”, “ecdsa”, “ed25519”, or “rsa” for SSH protocol version 2.
• -b 4096 : Specifies the number of bits in the key to create.
• -f~/.ssh/aws-lighsail.key : Specifies the filename of the key file.
• -C -C 'My AWS SSH Keys' : Set a new comment.

I am going type the following command on my Ubuntu desktop to create the key pair:
$ ssh-keygen -t ed25519
I strongly recommend that you set up a passphrase when prompted.

How to copy the public key

Now our key paid generated and stored in ~/.ssh/ directory. You must copy a public SSH key file named ~/.ssh/id_ed25519.pub (or ~/.ssh/id_rsa.pub if you created RSA key) to the RHEL 8 server. Try the ssh-copy-id command as follows:
$ ssh-copy-id -i ~/.ssh/fileNameHere.pubuser@remote-RHEL8-server-ip
For example:
$ ssh-copy-id -i ~/.ssh/id_ed25519.pub vivek@192.168.2.211

How to log in using ssh and without a password

Now try logging into the machine, with the ssh command as follows:
$ ssh user@rhel-8-server
$ ssh vivek@192.168.2.211
You should be able to log in without a password. If you set up a passphrase, unlock it as follows for your current session so that you don’t have to enter it every time you run ssh, sftp, scp, rsync and other commands:
$ ssh-agent $SHELL
$ ssh-add

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Optional settings for root user

Disable root user log in all together on RHEL 8 via ssh. Log in as root user on RHEL 8 and run following to add a user named vivek to wheel group:
# usermod -aG wheel vivek
# id vivek
Allows users in group wheel can use sudo command to run all commands on RHEL 8 server. Next disable root user login by adding the following line to sshd_config:
# vi /etc/ssh/sshd_config
Disable the password for root login and only allow ssh keys based login:

Save and close the file. Reload the ssh server:
# systemctl reload sshd.service
For more info see “Top 20 OpenSSH Server Best Security Practices“.

Conclusion

You learned how to set up and use SSH keys to manage your RHEL 8 based server. For more info see OpenSSH man pages here.

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You can review our RHEL 8 installation tutorial on the link below.

To easily understand this, I will be using two servers:

Redhat Generate New Ssh Key Mac

• 192.168.20.100 (kerrigan) – server from which I will be connecting
• 192.168.20.170 (tecmint) – my RHEL 8 system

In this tutorial, you are going to learn how to setup passwordless SSH login on your RHEL 8 install using ssh keys. Open-ssh server should already be installed on your system, but in case it is not, you can install it by issuing the following command:

Step 1: Generate SSH Key on 192.168.20.100 (kerrigan)

On the system, from where you will be connecting to your RHEL 8 system, generate a new ssh key pair. This can be done by using the following command:

You can configure a meaningful name for the file or just leave it to the default one. When asked for a passphrase, simply press “enter” and leave the password empty.

Step 2: Copy SSH Key to 192.168.20.170 (tecmint)

Copying the key is a simple task and that can be completed by using ssh-copy-id command as shown.

When prompted for the remote user’s password, simply enter it. This will create the “.ssh” directory if missing and the authorized_keys file with appropriate permissions.

Copy SSH Key to RHEL 8

Step 2: Test SSH Passwordless Login from 192.168.20.100

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Now that we have the key copied to our remote server, we can test the connection. You should not be asked for password:

In this tutorial you learned how to SSH to your RHEL 8 system using passwordless ssh key. I hope the process was easy. If you have any questions, please post them in the comment section below.