Ubuntu, Debian, Kali Ssh Installation
I want to connect my Linux server securely. Security is important nowadays. OpenSSH is a secure shell for remote connections. OpenSSH is very popular and have very life saver features.
Installation
Installation of ssh is like below. ssh full package name is Openssh-server which provides daemon, client and auxiliary tools for ssh.
Ubuntu, Debian, Mint, Kali:
1 | $ sudo apt-get install openssh-server |
Ubuntu, Debian, Mint, Kali
CentOS, Fedora, RedHat:
1 | $ sudo yum install openssh-server |
Start Ssh Service
After installation if service is not started by default. We can start ssh service with different methods but the most basic way is using init.d system.
1 | $ sudo /etc/init.d/ssh start |
Start Ssh Service
Get Status of Ssh Service
After the service is started we can check the service status with the status command for init.d. This will list some information like process ID, memory usage, CPU usage.
1 | $ /etc/init.d/ssh status |
Get Status of Ssh Service
Enable SSH Firewall Rule
Firewalls are used to protect servers for attacks.One of the main function is blocking port access. Default Ubuntu installation enables firewall named ufw. We will create a rule for ufw with the following command.
1 | $ ufw allow ssh |
Enable SSH Firewall Rule
Generate Ssh Key
SSH uses public and private keys. By default SSH do not generate SSH keys by default. We can create SSH keys with the ssh-keygen like below.
1 | $ ssh-keygen |
Generate Ssh Key
We see from screenshot that RSA key pair is created by default. Created keys are stored in the user home .ssh directory.
Connect SSH Server
Now we will made a test connection to the SSH server by providing the host name or IP address.
1 | $ ssh 192.168.142.144 |
Connect SSH Server
