create ssh keys and copy it on the remote server

Step 1: Create public and private keys using ssh-key-gen on local-host

mkdir -p $HOME/.ssh
chmod 0700 $HOME/.ssh

ssh-keygen -t rsa -b 4096 <> -f ~/.ssh/newremoteweb.key <> -C "My new remote web key" <>
ssh-keygen -t rsa -P ""

Step 2: Copy the public key to remote-host using ssh-copy-id

ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host
ssh-copy-id -i ~/.ssh/id_rsa.pub remote-user@remote-host

scp $HOME/.ssh/id_rsa.pub remote-user@remote-host:~/.ssh/authorized_keys

adding the public key in remote server

## First create .ssh directory on server
ssh remote-user@remote-host "umask 077; test -d .ssh || mkdir .ssh"

## cat local id.rsa.pub file and pipe over ssh to append the public key in remote servercat $HOME/.ssh/id_rsa.pub | ssh remote-user@remote-host "cat >> .ssh/authorized_keys"

Now try logging into the machine, with "ssh 'remote-host'", and check in:

.ssh/authorized_keys

Step 3: Login to remote-host without entering the password

ssh remote-host

It should connect without password. Our testing is over..

Some important stuffs which you can consider.

$HOME/.ssh/id_rsa– contains your private key.
$HOME/.ssh/id_rsa.pub – contain your public key.

restarting  ssh daemon/service on the server.

## on centos/rhel/fedora
sudo service sshd reload

## on linux server
sudo systemctl reload sshd

## on debian/ubuntu - older version
sudo /etc/init.d/ssh reload

## on debian/ubuntu - latest
sudo systemctl reload ssh

## common method to reload sshd
sudo kill -HUP `cat /var/run/sshd.pid`
or
sudo kill -HUP $(cat /var/run/sshd.pid)

## list all public key parameters of all identities from the ssh-agent:
ssh-add -L

## deleting all private keys from the ssh-agent:
ssh-add -D

## kill the ssh agent, which is running:
kill $SSH_AGENT_PID
trap "kill $SSH_AGENT_PID" 0