Install and configure CSF Config Server Firewall and secure your server.
CSF is a popular security tool for Linux to secure the server with stateful packet inspection firewall SPI intrusion detection a login failure daemon DDOS protection and control panel integration.
In this guide you are going to learn how to install and setup CSF and also the essential commands to use the firewall on Ubuntu 20.04.
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Update server packages to latest.
By default Ubuntu 20.04 ships with UFW which is a a basic firewall. Remove UFW using the below command.
Install the required dependencies that are used by CSF.
Install Sendmail which is used by CSF for communication.
You can refer this documentation for detailed setup of Sendmail.
Now you have all dependencies to install and configure CSF.
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