4 Systems & infrastructure

28 entries match these filters

• 0055 Docker basics: images, containers and the commands you need An image is a read-only package of an app and its dependencies, and a container is a running instance of it. Learn… Beginner · Concept · Linux, macOS, Windows Article Docker basics 15 Oct 2026
• 0098 What Proxmox VE is: KVM virtual machines, LXC containers and a web UI Proxmox VE is an open source virtualization platform based on Debian. It runs KVM virtual machines and LXC containers and is managed… Beginner · Concept · Linux Article Basics · Installation & first steps 15 Oct 2026
• 0099 Proxmox VE repositories and updates: enterprise vs no-subscription A fresh Proxmox VE install uses the enterprise repository, which needs a subscription. Learn how to switch to the no-subscription repository and… Beginner · How-to · Linux Article Installation & first steps · Packages & updates 15 Oct 2026
• 0101 Create LXC containers with pct and pveam Download a container template with pveam, create an unprivileged LXC container with pct, give it a network address and get a shell… Beginner · How-to · Linux Article VMs & containers 15 Oct 2026
• 0110 Fix: TASK ERROR: VM is locked (backup) A VM or container still carries a backup lock, usually after a backup was interrupted. Check that no backup is running, then… Beginner · Fix · Linux Article Backup & restore · VMs & containers 15 Oct 2026
• 0115 What is Oracle Private Cloud Appliance (PCA)? Hardware, enclaves and release lines Oracle Private Cloud Appliance is a factory-built rack of compute, storage and network hardware with its own cloud software. Release 3.x offers… Beginner · Concept · Linux Article Architecture & concepts 15 Oct 2026
• 0116 PCA 3.x Compute Enclave concepts: tenancies, compartments, VCNs, instances, images and shapes The PCA 3.x Compute Enclave uses OCI building blocks: a tenancy holds compartments, which hold networks, instances and storage. Instances are built… Beginner · Concept · Linux Article Architecture & concepts · Compute, networking & storage 15 Oct 2026
• 0123 KVM vs QEMU vs libvirt: how Linux virtualization fits together KVM is the Linux kernel part that uses CPU virtualization extensions, QEMU is the program that emulates a full machine around it,… Beginner · Concept · Linux Article Basics 15 Oct 2026
• 0131 Kubernetes architecture: control plane, nodes, kubelet and etcd A Kubernetes cluster is a control plane that stores and decides the desired state, plus worker nodes that run your containers. This… Beginner · Concept · Linux Article Concepts 15 Oct 2026
• 0132 Pods, ReplicaSets and Deployments explained A Pod runs one or more containers together, a ReplicaSet keeps a fixed number of identical Pods alive, and a Deployment manages… Beginner · Concept · Linux Article Concepts · Workloads & services 15 Oct 2026
• 0135 Deploy your first app on Kubernetes A step-by-step tutorial: write a Deployment and a Service in YAML, apply them, reach the app, add health probes, roll out a… Beginner · How-to · Linux Article Ingress & networking · Workloads & services 15 Oct 2026
• 0140 kubectl cheat sheet: the commands you use every day A compact reference of everyday kubectl commands: contexts and namespaces, listing and inspecting objects, logs and exec, applying changes, rollouts, scaling and… Beginner · Reference · Any system Article Concepts · Troubleshooting 15 Oct 2026
• 0149 OpenShift vs Kubernetes vs OKD: what OpenShift adds OpenShift is Red Hat's Kubernetes platform and OKD is its community distribution. Both add projects, routes, builds, image streams, Operators and stricter… Beginner · Concept · Linux Article Concepts · Concepts 15 Oct 2026
• 0150 Logging in with oc and working with OpenShift projects Install the oc client, log in with a password, browser or token, then create, switch and inspect projects. Covers where oc stores… Beginner · How-to · Any system Article Concepts · Deploying applications 15 Oct 2026
• 0151 Tutorial: deploy a small web app on OpenShift and expose it with a Route A step-by-step first deployment: create a project, build a static website from Git with Source-to-Image, publish it on an HTTPS Route, then… Beginner · How-to · Any system Article Deploying applications 15 Oct 2026
• 0164 systemd services: systemctl and journalctl basics systemd starts and supervises services on most Linux servers. systemctl starts, stops and enables them; journalctl shows their logs. Beginner · Concept · Linux Article Services & systemd 15 Oct 2026
• 0172 Fix: No space left on device Writes fail because a filesystem is full, out of inodes, or holding space for deleted files that are still open. Find which… Beginner · Fix · Linux Article Disks, LVM & filesystems 15 Oct 2026
• 0174 Network and DNS troubleshooting commands: ip, ss, dig, resolvectl A layer-by-layer cheat sheet for "the server cannot reach X": interfaces and routes with ip, listening ports with ss, and name resolution… Beginner · Reference · Linux Article Networking & firewalls 15 Oct 2026
• 0176 apt vs dnf: package commands and automatic security updates The everyday package commands on Debian/Ubuntu (apt) and RHEL/Rocky/Alma (dnf) side by side, plus how to turn on automatic security updates on… Beginner · Reference · Linux Article Packages & updates 15 Oct 2026
• 0177 Users, groups and sudo on Debian, Ubuntu and RHEL How Linux accounts and groups work, how to create users, and how sudo gives admin rights through the sudo group on Debian/Ubuntu… Beginner · Concept · Linux Article Users, sudo & hardening 15 Oct 2026
• 0181 Ansible concepts: inventory, modules, playbooks, idempotency and roles Ansible configures many servers over SSH from one control machine. Learn the core pieces: inventory, modules, tasks, playbooks, roles, and why runs… Beginner · Concept · Linux, macOS Article Ansible 15 Oct 2026
• 0182 Your first Ansible playbook: install nginx and publish a page A complete beginner playbook that installs nginx on Debian or Ubuntu servers, starts it at boot and deploys a home page, with… Beginner · How-to · Linux, macOS Script Ansible 15 Oct 2026
• 0187 Terraform concepts: providers, state, plan and apply, modules, and OpenTofu Terraform describes infrastructure in code, compares it with what exists, and changes only the difference. Learn providers, resources, state, the plan/apply loop,… Beginner · Concept · Any system Article Terraform 15 Oct 2026
• 0247 Build a Proxmox VE home lab: from bare metal to your first restored backup Install Proxmox VE on one spare machine, switch to the free update repository, create a VM and an LXC container, then schedule… Beginner · Tutorial · Linux Article Backup & restore · Installation & first steps · VMs & containers 15 Oct 2026
• 0248 Run your first KVM virtual machine with libvirt and virt-install Turn a Linux desktop or server into a KVM host: check CPU support, install libvirt, use the default NAT network, create a… Beginner · Tutorial · Linux Article Basics 15 Oct 2026
• 0249 Set up and harden a fresh Linux server in one afternoon Take a new Ubuntu, Debian or Rocky/Alma server from first login to a safer baseline: sudo admin, SSH keys only, firewall, automatic… Beginner · Tutorial · Linux Article Networking & firewalls · Packages & updates · Users, sudo & hardening 15 Oct 2026
• 0251 Learn Kubernetes on your laptop with kind: from first cluster to Ingress Build a throwaway Kubernetes cluster in Docker with kind, deploy a web app with config, secrets and probes, scale it, roll out… Beginner · Tutorial · Linux, macOS, Windows Article Concepts · Workloads & services 15 Oct 2026
• 0256 Manage infrastructure as code with Terraform: from first file to plans on pull requests Learn the full Terraform workflow without a cloud account: variables, a module, outputs, state, plan, apply and destroy, a backend for shared… Beginner · Tutorial · Linux, macOS, Windows Article GitHub Actions · Terraform 15 Oct 2026