How to Install Netdata on RHEL 7 Netdata is a real-time performance monitoring agent that delivers per-second metrics with zero configuration on most Linux systems. Unlike heavier monitoring solutions that scrape on 15-second or 1-minute intervals, Netdata collects and stores data every second, making it ideal for diagnosing transient performance problems that would be invisible […]
How to Install Zabbix on RHEL 7 Zabbix is a mature, enterprise-grade open-source monitoring platform that supports agent-based and agentless monitoring of servers, network devices, applications, and cloud resources. It combines metrics collection, event correlation, alerting, and visualisation in a single self-hosted solution — making it a compelling choice for organisations that need full control […]
How to Set Up the ELK Stack on RHEL 7 The ELK Stack — Elasticsearch, Logstash, and Kibana — is the industry-standard open-source solution for centralised log management and analysis. Elasticsearch stores and indexes log data at scale, Logstash ingests and transforms log streams from any source, and Kibana provides a powerful web UI for […]
How to Install Prometheus and Grafana on RHEL 7 Prometheus and Grafana form one of the most popular open-source monitoring stacks available today. Prometheus is a time-series database and scraping engine that collects metrics from instrumented targets, while Grafana provides a rich visualization layer on top of that data. Together they give you real-time dashboards, […]
How to Harden Web Servers: Security Headers, CSP and HSTS on RHEL 7 HTTP security headers are one of the most cost-effective controls available to web server administrators. They instruct the browser to enforce strict content handling rules, preventing common attacks such as cross-site scripting (XSS), clickjacking, MIME-type confusion, and protocol downgrade attacks — without […]
How to Scan for Vulnerabilities with OpenVAS on RHEL 7 OpenVAS (Open Vulnerability Assessment System), now part of the Greenbone Vulnerability Management (GVM) framework, is one of the most capable open-source vulnerability scanners available. It maintains a continuously updated feed of over 50,000 Network Vulnerability Tests (NVTs) and can detect misconfigurations, outdated software, missing patches, […]
How to Configure DNSSEC on RHEL 7 DNS Security Extensions (DNSSEC) add a layer of cryptographic verification to the Domain Name System, protecting users from cache poisoning attacks, man-in-the-middle redirects, and forged DNS responses. By digitally signing DNS zone data, DNSSEC allows resolvers to confirm that the records they receive are authentic and unmodified. This […]
How to Set Up a Certificate Authority with OpenSSL on RHEL 7 A Private Certificate Authority (CA) is essential infrastructure for any organization that needs to issue and manage TLS certificates for internal services, VPNs, mutual TLS authentication, or code signing — without relying on commercial CAs or exposing internal hostnames to the public internet. […]
How to Install HashiCorp Vault for Secrets Management on RHEL 7 HashiCorp Vault is an open-source tool for securely storing and tightly controlling access to tokens, passwords, certificates, API keys, and other secrets throughout the software lifecycle. Unlike storing secrets in configuration files or environment variables, Vault provides a central, audited, and access-controlled secrets store […]
How to Set Up Port Knocking for SSH on RHEL 7 Port knocking is a stealthy technique for controlling access to network services by requiring a client to send connection attempts to a predefined sequence of closed ports before a firewall rule opens the target port. When applied to SSH, it effectively hides port 22 […]
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