Articles by Deepak Prasad
auditd Commands in Linux: auditctl, ausearch & aureport (RHEL/Fedora/Rocky)
The Linux audit framework logs security-relevant events through auditd. Use auditctl to define rules, ausearch to query the audit log, and aureport for summaries — with augenrules to load persistent policy on RHEL-family …
nft Command in Linux: nftables Rules, Tables & Chains (RHEL/Fedora/Rocky)
nft is the userspace CLI for the Linux nftables firewall framework. Define tables, chains, and rules in the netfilter stack — list the live ruleset, load rule files, and debug filtering alongside firewalld on RHEL-family …
podman Command in Linux: Run Containers, Images & Pods (RHEL/Fedora/Rocky)
podman runs OCI containers and pods without a central daemon. On RHEL, Rocky Linux, AlmaLinux, and Fedora it is the default container CLI — pull images, run rootless workloads, manage volumes and networks, and integrate …
Best 7 CDC Tools for Real-Time Replication to Snowflake
Compare seven change data capture platforms for streaming database changes into Snowflake, from fully managed services to open-source capture engines you operate yourself.
Configure Transparent HugePages on RHEL 8–10: always, madvise or never
Check, disable or set Transparent HugePages to madvise on RHEL 8–10, Rocky Linux, AlmaLinux, CentOS Stream and Oracle Linux.
Download and Sync an Entire DNF Repository for Offline Use
Download and sync complete RPM repositories on RHEL 8/9/10, Rocky Linux, AlmaLinux, CentOS Stream, and Oracle Linux using dnf reposync, repository metadata, GPG verification, and offline clients.
Create Anaconda updates.img and Use inst.updates on RHEL 8–10
Create Anaconda updates.img on RHEL 8–10, embed it in boot media with mkksiso, load it with inst.updates, and verify the installer overlay.
Configure Postfix SMTP Relay on RHEL 9/10
Configure Postfix as a null client or internal SMTP relay on RHEL 9 and 10, Rocky Linux, AlmaLinux, CentOS Stream, and Oracle Linux using relayhost, SASL authentication, STARTTLS, SWAKS, and queue troubleshooting.
Configure Remote Desktop on RHEL 10 with RDP (TigerVNC Alternative)
Configure GNOME Remote Desktop with RDP on RHEL 10, Rocky Linux 10, AlmaLinux 10 and CentOS Stream 10 as the TigerVNC replacement.
Install and Configure TigerVNC Server on RHEL 8/9
Install and configure TigerVNC Server on RHEL 8 and 9, Rocky Linux, AlmaLinux, and CentOS Stream using user mappings, systemd, GNOME, firewalld, and secure VNC connections.
Rolling Release vs Fixed Release Linux: Differences, Risks and Use Cases
Compare rolling-release and fixed-release Linux distributions by package freshness, stability, update frequency, upgrade risk, maintenance effort, support lifecycle and desktop or server use cases.
SSH Port Forwarding on RHEL, Rocky Linux, AlmaLinux, CentOS Stream and Oracle Linux
Configure local, remote and dynamic SSH port forwarding on RHEL 8–10, Rocky Linux, AlmaLinux, CentOS Stream and Oracle Linux.
Run systemd Service as a Specific User and Group in Linux
Create a system-level systemd service that starts at boot and runs as a dedicated non-root user and group on Ubuntu, Debian, Fedora, RHEL, Rocky Linux, AlmaLinux, CentOS Stream and Oracle Linux.
Secure BIND Zone Transfers with TSIG on RHEL-Based Linux
Learn how to secure BIND primary-to-secondary DNS zone transfers with TSIG on RHEL, Rocky Linux, AlmaLinux, and CentOS Stream using HMAC-SHA256.
Restart or Reload Network on RHEL, Rocky Linux, AlmaLinux and Fedora
Learn which command to use to restart, reload, or reconnect networking on RHEL, Rocky Linux, AlmaLinux, CentOS Stream, Oracle Linux, and Fedora—from nmcli reload to legacy network.service workflows.
RPM vs DEB Packages: Differences, Commands and Which Format Linux Uses
Compare RPM and DEB Linux packages, including package structure, metadata, dependencies, scripts, signatures, installation commands, querying, repositories, conversion risks and supported distributions.
Mount Filesystem with systemd on RHEL, Rocky Linux, AlmaLinux, CentOS Stream and Oracle Linux
Mount a local filesystem with a systemd mount unit on RHEL 8–10, Rocky Linux, AlmaLinux, CentOS Stream and Oracle Linux without editing fstab.
RHEL Family vs Debian Family: RPM, DEB, DNF, APT and Server Differences
Compare the RHEL and Debian Linux families, including RPM vs DEB, DNF vs APT, repositories, release models, lifecycle, security, support, configuration, cloud images and server use cases.
Rocky Linux vs AlmaLinux vs RHEL: Differences, Support and Compatibility
Compare Rocky Linux, AlmaLinux and Red Hat Enterprise Linux by compatibility policy, governance, repositories, support, lifecycle, certifications, migration paths and production use cases.
Fedora vs CentOS Stream vs RHEL: Differences and Development Flow
Compare Fedora, CentOS Stream and Red Hat Enterprise Linux, including their development flow, release lifecycle, package freshness, stability, support, subscriptions, repositories and best use cases.
Linux, Unix and Linux Distros Explained: Ubuntu, Debian, RHEL, Fedora and Arch
Learn how Unix, Linux, GNU/Linux and Linux distributions relate, why Ubuntu, Debian, Fedora, RHEL, Rocky Linux and Arch differ beyond desktop themes, and how to identify your distro from the shell.
How to Install EPEL Repo on RHEL, Rocky Linux, AlmaLinux, CentOS Stream and Oracle Linux
Install EPEL on RHEL 8–10, Rocky Linux, AlmaLinux, CentOS Stream and Oracle Linux. Enable CRB or PowerTools, verify EPEL and fix repository errors.
How to Safely Remove Old Kernels Using DNF or YUM
Learn how to safely remove old Linux kernels using DNF or YUM on RHEL, Rocky Linux, AlmaLinux, Fedora, CentOS Stream, and Oracle Linux while keeping the running kernel and a working fallback.
Change the Default Kernel on RHEL, Rocky Linux, AlmaLinux and Fedora
Use grubby on RHEL, Rocky Linux, AlmaLinux, CentOS Stream, Oracle Linux, and Fedora to check the running kernel, pick a persistent default, and verify the choice before reboot.
How to Download RPM Packages with All Dependencies Using DNF
Download RPM packages with all dependencies using DNF on RHEL, Rocky Linux, AlmaLinux, Fedora, CentOS Stream, and Oracle Linux for offline installation.
Fix curl SSL Certificate Problem Behind Corporate Proxy on Linux
Fix curl error 60 and similar HTTPS failures on Linux when corporate SSL inspection replaces public certificates with a private root CA trusted on Windows but missing from the Linux trust store.
Ansible Git and VS Code Workflow: Clone, Edit, Commit, and Run Playbooks
Set up a practical Ansible Git and VS Code workflow on Rocky Linux—clone a repo, edit YAML safely, commit playbooks, ignore secrets and cache files, run ansible-playbook from the integrated terminal, lint with …
Provision AWS EC2 Instances with Ansible Playbooks
Pin amazon.aws 8.2.0, set EC2 values in vars/aws_lab.yml, and use amazon.aws.ec2_instance with vpc_subnet_id and security group IDs to launch, tag, start, stop, and terminate instances by ID or tag filter.
Kubernetes Tutorial for Beginners & Experienced
Free Kubernetes tutorial that takes you from cluster install to CKA/CKAD-level topics - pods, deployments, RBAC, networking, Helm, security, autoscaling. 59 hands-on lessons across 11 chapters, every example tested on …
Generate /etc/hosts, Archives and System Reports with Ansible
Use Ansible on Rocky Linux 10 to generate /etc/hosts from inventory and facts, create and extract archives, render system reports with Jinja2 templates, and fetch reports to the control node.