1. When installing
Ubuntu, openssh-client is installed by default, so it will not be installed here. If your system is not installed, you can install it with apt-get.
install ssh-server
sudo apt-get install openssh-server
install ssh-client
sudo apt-get install openssh-client
2. Confirm whether sshserver is installed
ps -e | grep sshd
450 ? 00:00:00 sshd
If you see sshd, it means that ssh-server has been started.
If only ssh-agent indicates that ssh-server has not started, you need to execute the command to start the ssh service:
/etc/init.d/ssh start;
Note: Only sshd is displayed in the installation of ubuntu-12.04-server-i386.iso :
3. Extended configuration
The default service port of SSH is 22. Users can define other ports themselves, such as 222. The configuration file to be modified is:
/etc/ssh/sshd_config
Change the Port parameter in it to 222
and then restart the SSH service:
sudo /etc/init.d/ssh restart