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Practical, command-level guides for system administrators and DevOps engineers — Linux, networking, containers, cloud, databases, virtualization and telecom.
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Redis Cluster vs Sentinel
Sentinel gives you automatic failover for one Redis dataset. Cluster shards data across nodes AND fails over. Here's how each works and which you actually need.
September 24, 2026oVirt Architecture Overview
oVirt is a datacenter virtualization manager on top of KVM. Here's how the engine, VDSM hosts, storage domains, and the hosted-engine model fit together.
September 24, 2026Your First VM with KVM and libvirt
From a bare Linux host to a running VM: the packages, the virt-install command, and the virsh commands you'll use every day.
September 18, 2026qcow2 vs raw, and How Snapshots Work
raw is fastest and simplest; qcow2 gives you thin provisioning, snapshots, and compression. Here's how qcow2's copy-on-write works and how to snapshot a running VM.
September 18, 2026auditd Basics
auditd records who did what at the syscall level — file access, config changes, privilege use. Here's how to write useful rules without drowning the disk.
September 16, 2026SSH Server Hardening
The sshd_config settings that matter, in priority order — key-only auth first — plus how to apply them without locking yourself out of the box.
September 16, 2026Finding What Is Using a Port on Linux
The three commands that answer 'address already in use', including the container and namespace cases that trip people up.
September 16, 2026Redis Streams as a Work Queue
Redis Streams give you a persistent, consumer-group log — enough for many work-queue needs without adding Kafka or RabbitMQ. Here's the commands and the reliability model.
September 15, 2026Kustomize Basics
Kustomize customizes plain YAML with overlays instead of templating. Here's bases vs overlays, the patch types, generators, and the gotchas around name suffixes.
September 13, 2026EKS vs Self-Managed Kubernetes
EKS runs the control plane for you; you still own nodes, networking, and add-ons. Here's the division of responsibility, the node options, and when self-managed is worth it.
September 11, 2026AWS Step Functions Basics
Step Functions orchestrates multi-step workflows as a state machine with built-in retries, error handling, and visual history. Here's the states, the two types, and when to use it.
September 10, 2026Diameter Routing Agents in Depth
A Diameter Routing Agent is the STP of the LTE/IMS world — it routes messages by realm and application so nodes don't need full-mesh peering. Here's the agent types and routing.
September 8, 2026