Generating public/private ssh keys
How to generate and use public / private ssh keys
This guide is tested on Centos 6
To generate RSA ssh key pair enter following command:
ssh-keygen -t rsa
To generate DSA ssh key pair enter following command:
ssh-keygen -t dsa
You will be prompted to specify a path to locate the keys
[root@localhost ~]# ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/root/.ssh/id_rsa):
You can specify it or just press "enter" to accept default location.
Now you have the keys generated. The keys are id_rsa and id_rsa.pub.
Copy id_rsa.pub to remote host(s) in user directory, for example /home/alex/.ssh/ or ~/.ssh, and rename it to authorized_keys. Copying can be done with scp:
scp id_rsa.pub email@example.com:/home/alex/.ssh/authorized_keys
or using ssh-copy-id:
with identity file:
ssh-copy-id -i <identity> firstname.lastname@example.org
If you have an issue like "command not found" install ssh clients on both sides entering:
yum install openssh-clients
Now open /etc/ssh/sshd_config on remote host and set following attributes:
RSAAuthentication yes PubkeyAuthentication yes PasswordAuthentication no
Restart ssh service
To add one more public key to remote host simply append the key to existing authorized_key manually or using command:
cat ~/.ssh/another_one_id_rsa.pub >> ~/.ssh/authorized_keys
If you can't get why it doesn't work make sure you have selinux disabled ""