Linux start sshd (OpenSSH) server command

To start the OpenSSH server (sshd) on a Linux system, you can use the systemctl command. Here are the steps you can follow to start the sshd server on a Linux system:

1. Install OpenSSH:

2. First, you will need to install the OpenSSH package on your Linux system. The OpenSSH package is available in the default repositories of most Linux distributions, so you can install it using the package manager of your distribution. For example, on a Debian-based system, you can use the apt-get command to install OpenSSH:

sudo apt-get update
sudo apt-get install openssh-server

3. On a Red Hat-based system, you can use the yum command to install OpenSSH:

sudo yum update
sudo yum install openssh-server

4. Start the sshd service:

5. Once OpenSSH is installed, you can start the sshd service using the systemctl command. For example, on a Debian-based system:

sudo systemctl start ssh

6. On a Red Hat-based system:

sudo systemctl start sshd

7. Enable the sshd service to start automatically on boot:

8. If you want the sshd service to start automatically every time your system boots up, you can use the systemctl command to enable the service:

sudo systemctl enable ssh

9. On a Red Hat-based system:

sudo systemctl enable sshd

10. Test the sshd server:

11. To test the sshd server, you can use a command-line SSH client such as ssh to connect to the server from another machine. For example, from a different Linux system, you can use the following command to connect to the sshd server:

ssh username@server_ip_address

12. You will be prompted to enter the password for the username user. If the connection is successful, it means that the sshd server is up and running.

Note that these steps may vary depending on the specific Linux distribution and version you are using. Additionally, you may need to configure the sshd server and create users and SSH keys if you want to secure the server and allow access to specific users.