PXE (Preboot eXecution Environment) boot lets you install an operating system over the network without a physical USB drive or DVD. On RHEL 8 this capability is built from three cooperating services: a DHCP server that hands out IP addresses and points new clients to the boot server, a TFTP server that delivers the initial […]
FreeIPA is Red Hat’s integrated identity management solution that bundles LDAP (389 Directory Server), Kerberos, DNS, NTP, and a certificate authority into a single coherent platform. It is the upstream project for Red Hat Identity Management (IdM) and is fully supported on RHEL 8. FreeIPA dramatically simplifies managing users, groups, hosts, and policies across a […]
Apache HTTP Server (httpd) is one of the most widely deployed web servers in the world and is fully supported on RHEL 8 through the AppStream repository. After installing the httpd package, you will configure the firewall, review the main configuration file, and serve content from a custom document root. This tutorial covers everything you […]
Rootkits are malicious software packages designed to gain persistent, hidden root-level access to a system by replacing or patching critical binaries, kernel modules, or configuration files. Two widely used open-source tools — rkhunter (Rootkit Hunter) and chkrootkit — complement each other by using different detection techniques: signature databases, hash comparisons, and behavioural checks. On RHEL […]
Bacula is a mature, enterprise-class open-source backup solution that supports tape libraries, disk-based storage, and remote clients across heterogeneous environments. Its client-server architecture separates the Director (job scheduler and catalog manager), Storage Daemon (tape or file I/O), and File Daemon (agent running on each backed-up host), allowing you to scale from a single server to […]
Securing your Apache web server with a free SSL/TLS certificate from Let’s Encrypt is one of the most important steps you can take to protect your visitors and improve your site’s trustworthiness. Certbot, the official Let’s Encrypt client, automates the entire certificate issuance and renewal process. On RHEL 8, Certbot is available through the EPEL […]
🟡 Medium ⏱ 5–30 min Last verified: 9 February 2022 Affected versions: 8.4 8.5 8.6 8.7 8.8 8.9 8.10 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention […]
MySQL Group Replication extends traditional replication with built-in automatic failover and a distributed consensus protocol, making it suitable for high-availability deployments without requiring additional orchestration tools. In single-primary mode, one node accepts writes at a time while all nodes serve reads, and the group automatically elects a new primary if the current one fails. This […]
Two-factor authentication (2FA) adds a second layer of security to SSH logins by requiring both something you know (a password or private key) and something you have (a time-based one-time password generated by an authenticator app). On RHEL 8, the Google Authenticator PAM module is available through EPEL and integrates with OpenSSH via PAM and […]
Multi-stage builds are one of the most powerful features in Docker, allowing you to produce lean production images by separating the build environment from the runtime environment. On RHEL 8, where production image size and attack surface matter, multi-stage builds reduce final image size dramatically by discarding build tools and intermediate artifacts. This tutorial walks […]
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