Place the IP address and kvm3 host name into file /etc/hosts on your desktop. For example, if IP address of kvm3 is 192.168.122.114:
ssh to kvm3 as user hostadm:
Command netstat shows open tcp/21 port by inetd service:
From the desktop, ftp to kvm3.
Use hostadm user credentials (login name and password).
For SSH authentication, you can use either RSA or DSA public/private keys besides password. We'll be using RSA in the exercises below.
To generate an RSA key pair, type the following command at a shell prompt on your desktop:
Accept the default file location of ~/.ssh/id_rsa. Enter a passphrase different from your account password and confirm it by entering it again.
The public key is written to ~/.ssh/id_rsa.pub. The private key is written to ~/.ssh/id_rsa.
Never distribute your private key to anyone.
The contents of ~/.ssh/id_rsa.pub needs to be delivered onto the remote machine to which you want to connect, specifically kvm3, into file ~/.ssh/authorized_keys
To accomplish the transfer task, here you can use ftp service installed in the previous exercise.
Command cd in the ftp> shell above is for stepping into the directory, .ssh, on the remote host, kvm3.
Command lcd is for stepping into the directory, .ssh, on the local desktop.
Now try to ssh to kvm3. You should be prompted to enter your passphrase.
The ssh-agent can be used to store your passphrase so that you do not have to enter it each time you make a ssh or scp connection.
At a shell prompt on the desktop, type the following command:
Then type the command:
and enter your passphrase(s). If you have more than one key pair configured, you will be prompted for each one. When you log out, your passphrase(s) will be forgotten. You must execute these two commands each time you log in to a virtual console or open a terminal window.
Copy files from your desktop to kvm3 and vise versa using scp command:
This tool lets you copy files and directories between a local host and a remote host.
Install rsync on both your desktop and kvm3:
Creat a directory tree and copy it over to kvm3 with rsync command.
Option a stands for archive (preserve links and timestamps); v is for verbose and z is for data compression when sending-receiving.
Since you have fully functioning SSH on kvm3, you can get rid of ftp servers. The easiest way to accomplish it is by stopping and disabling the master service, inetd:
Make sure port tcp/21 is not open by running
Never run rsh, rlogin, telnet and ftp servers on the open Internet. They are very unsecure due to clear text authentication and data transfer.