OpenSSH is a secure networking utility that provides encryption for remote administration of servers and systems. It is widely used for secure remote logins and for executing commands on remote machines. In this guide, we will walk through the process of installing OpenSSH on a CentOS 7 server.
Step 1: Update the System
Before installing any new software, it is recommended to update the system to the latest packages.
$ sudo yum update
Step 2: Install OpenSSH
To install OpenSSH, use the following command:
$ sudo yum install openssh-server
Step 3: Start OpenSSH Service
Once the installation is complete, start the OpenSSH service using the following command:
$ sudo systemctl start sshd
Step 4: Enable OpenSSH Service
To ensure that OpenSSH starts automatically at boot, enable the service using the following command:
$ sudo systemctl enable sshd
Step 5: Configure Firewall
If you are using a firewall, you need to allow incoming SSH connections. The default SSH port is 22. Use the following command to enable SSH:
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