sudo firewall-cmd -add-port=2028/tcp -permanent Now, to add the custom SSH port to your system, run the firewall-cmd command below. And there are many more that you can do with using the firewall-cmd. You can use firewall-cmd to add, remove, and modify firewalld rules. It is the command-line interface for managing firewalld rules. The firewalld service is active (running).įor interacting with firewalld, you can use the command firewall-cmd. You'll receive a similar output like the screenshot below. Then verify its status by running the following command. sudo dnf install firewalld -yĪfter firewalld installation is completed, start and enable the firewalld service. To install firewalld, run the dnf command below. In this section, you'll install firewalld and set up its open ports for your SSH server. On CentOS/RHEL-based distribution, firewalld is the default firewall package that you can install on your system. This will increase your server security, by limiting access only to specific services such as SSH, HTTP, and HTTPS. If you are using the CentOS/RHEL server on the public internet, such as a cloud server, then you may need to enable the firewall. This tutorial uses the non-standard port 2028 for SSH. sudo vi /etc/ssh/sshd_configīefore you start editing the file, you must know that lines beginning with # and empty lines are interpreted as comments.Īt the top of the line, change the default SSH port from 22 to your preferred port. Now, open the file sshd_config using vi editor or your preferred editor. This setting is recommended for security reasons, it is to increase server security and reduce the brute force attack against your server. In this section, you'll modify the configuration sshd_config, then change the default SSH port and disable login for the root user. This file contains some basic SSH configuration, such as ListenAddress that determines the IP address of running SSH service, Port for setting up SSH service port, authentication methods, and many more. Configuring SSH Serverīy default, the SSH configuration is available at the /etc/ssh directory, and the main configuration file is sshd_config. You'll receive output like the following screenshot. Now, verify the sshd service status by running the following command. sudo dnf install openssh-server openssh-clients -yĪfter OpenSSH installation is complete, execute the following command to start the sshd service and enable it to start automatically at the system boot. This command will install OpenSSH server packages, as well as OpenSSH client software. Next, install OpenSSH packages on the CentOS/RHEL systems using the following command. By default, OpenSSH is available on most Linux distribution repositories, including CentOS and RHEL systems.īefore you get started, refresh your package index using the DNF package manager as below. It is used by millions of Linux servers, and become a critical part of the server environment. OpenSSH is one of the most popular software implementations of SSH protocol. And in the end, this user can be used to log in to your server. This user will be used for modifying your system.
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