Security, Upgrades & Backups

Security is one of the most important concerns that server administrators face. These guides will help you harden your system’s security, addressing topics that include configuring a firewall, creating and administering SSL certificates for transport layer security, offering secured SFTP user access to your Linode, and blocking malicious probes, among others.

What You Need to Do to Mitigate Meltdown and Spectre

Intel recently disclosed two vulnerabilities that affect processors in most devices over the last 23 years. Here's how that affects you and what you can do about it.

How to Encrypt Your Data with dm-crypt

This guide shows how to use dm-crypt in plain mode or with LUKS to encrypt your data disk, partition or file container.

Visualize Server Security on CentOS 7 with an Elastic Stack and Wazuh

This guide shows how to use the Elastic Stack (Elasticsearch, Logstash, and Kibana) to collect, log, and visualize security data and threat alerts through Wazuh, part of OSSEC Intrusion Detection.

Getting Started with SELinux

This guide will walk you through the basics of installing and running SELinux.

Use Advanced OpenSSH Features to Harden Access to Your Linode

Tips to improve the security of your SSH server

Use Fail2ban to Secure Your Server

This guide shows how to set up Fail2Ban, a log-parsing application, to monitor system logs and detect automated attacks on your Linode.

How to Secure Your Server

This guide covers basic best practices for securing a production server, including setting up user accounts, configuring a firewall, securing SSH, and disabling unused network services.

Recovering from a System Compromise

This guide outlines steps to protect your data and recover your system in the event of a suspected system compromise.