How to setup SSH on Ubuntu

Consider that 192.168.1.1 is a host, and «denis» is a user on the host side.

1. Installing server

sudo apt-get install ssh

2. Setting up server

sudo gedit /etc/ssh/sshd_config

Port 2000
PermitRootLogin no
AuthorizedKeysFile	%h/.ssh/authorized_keys

sudo service ssh restart

3. Setting up client

ssh-keygen -t dsa

(empty answer for every question)

ssh-copy-id "denis@192.168.1.4 -p 2000"

4. Close server access for user without dsa-authorization:

sudo gedit /etc/ssh/sshd_config

PasswordAuthentication no

sudo service ssh restart