Linux Tutorials

How To Set Up SSH Keys on RHEL Eight

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

Introduction – SSH is an acronym for safe shell. It’s a suite of cryptographic community protocol. It permits customers to log in and switch information securely over the unsecure community such because the Web. OpenSSH is an implementation of SSH protocol on RHEL Eight. You’ll be able to log in utilizing RHEL Eight person and password account. Nonetheless, OpenSSH undertaking recommends log in utilizing a mix of a personal and public SSH keys.

Pattern arrange for our RHEL Eight server

How To Set Up SSH Keys
The place,

You generate a key pair in your Linux/Unix/macOS desktop.Place the general public key on RHEL Eight server.One can unlock public key utilizing a personal key saved in your desktop with the assistance of ssh command.When each the private and non-private key appropriate you’ll be able to log in with no password.

How do I arrange SSH keys on RHEL Eight server?

The process to arrange SSH key on Pink Hat Enteprise Linux Eight server:

In your native desktop kind:
ssh-keygenSet up public key into distant RHEL Eight server utilizing:
ssh-copy-id person@remote-RHEL8-server-ipUse ssh for password much less login:
ssh person@remote-RHEL8-server-ip

Allow us to see all instructions and steps in particulars.

Methods 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”
The place,

-t rsa OR -t ed25519 : Specifies the kind of key to create. The doable values “dsa”, “ecdsa”, “ed25519”, or “rsa” for SSH protocol model 2.-b 4096 : Specifies the variety of bits in the important thing to create.-f~/.ssh/aws-lighsail.key : Specifies the filename of the important thing file.-C -C “My AWS SSH Keys” : Set a brand new remark.

I’m going kind the next command on my Ubuntu desktop to create the important thing pair:
$ ssh-keygen -t ed25519
Set Up SSH Keys on RHEL 8 using ssh-keygen commandPattern SSH key era course of on my Ubuntu Linux desktop
I strongly advocate that you simply arrange a passphrase when prompted.

Methods to copy the general public key

Now our key paid generated and saved in ~/.ssh/ listing. You need to copy a public SSH key file named ~/.ssh/ (or ~/.ssh/ for those who created RSA key) to the RHEL Eight server. Strive the ssh-copy-id command as follows:
$ ssh-copy-id -i ~/.ssh/ person@remote-RHEL8-server-ip
For instance:
$ ssh-copy-id -i ~/.ssh/ vivek@
Copy the Public Key To RHEL 8 serverssh-copy-id in motion

Methods to log in utilizing ssh and with no password

Now strive logging into the machine, with the ssh command as follows:
$ ssh person@rhel-Eight-server
$ ssh vivek@
It’s best to have the ability to log in with no password. For those who arrange a passphrase, unlock it as follows in your present session so that you simply don’t should enter it each time you run ssh, sftp, scp, rsync and different instructions:
$ ssh-agent $SHELL
$ ssh-add

Optionally available settings for root person

Disable root person log in all collectively on RHEL Eight through ssh. Log in as root person on RHEL Eight and run following so as to add a person named vivek to wheel group:
# usermod -aG wheel vivek
# id vivek
Permits customers in group wheel can use sudo command to run all instructions on RHEL Eight server. Subsequent disable root person login by including the next line to sshd_config:
# vi /and so on/ssh/sshd_config
Disable the password for root login and solely enable ssh keys primarily based login:

PermitRootLogin no
ChallengeResponseAuthentication no
PasswordAuthentication no
UsePAM no

Save and shut the file. Reload the ssh server:
# systemctl reload sshd.service
For more information see “High 20 OpenSSH Server Greatest Safety Practices“.


You discovered methods to arrange and use SSH keys to handle your RHEL Eight primarily based server. For more information see OpenSSH man pages right here.

Posted by: Vivek Gite

The creator is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a coach for the Linux working system/Unix shell scripting. Get the newest tutorials on SysAdmin, Linux/Unix and open supply subjects through RSS/XML feed or weekly e mail publication.

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