4 Systems & infrastructure
Every entry filed under Systems & infrastructure and its subtopics.
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230 entries match these filters
- 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 · Explains an idea · Linux Article Concepts · Workloads & services 15 Oct 2026
- 0133 Services and Ingress: exposing an app in Kubernetes A Service gives a changing set of Pods one stable address. ClusterIP is internal, NodePort and LoadBalancer reach outside, and an Ingress… Intermediate · Explains an idea · Linux Article Ingress & networking 15 Oct 2026
- 0107 Proxmox VE command line cheat sheet: qm, pct, pvecm, pvesm and more The Proxmox VE commands you use most: qm for VMs, pct for containers, pvesm for storage, pvecm for the cluster, vzdump for… Intermediate · Cheat sheet · Linux Article Clusters & high availability · VMs & containers 15 Oct 2026
- 0120 Block volumes on PCA 3.x: create, attach and mount a data disk Add storage to a Private Cloud Appliance 3.x instance: create a block volume, attach it as paravirtualized, then format and mount it… Intermediate · Step by step · Any system Article Compute, networking & storage 15 Oct 2026
- 0108 List all Proxmox VE guests with status and locks (pvesh + jq) A Bash script that lists every VM and container in the cluster with node, status, lock, memory and uptime, using the Proxmox… Intermediate · Cheat sheet · Linux Script Shell scripting · VMs & containers 15 Oct 2026
- 0130 OCI CLI: Oracle Cloud Infrastructure command-line interface Oracle's open-source command-line tool for Oracle Cloud Infrastructure. Private Cloud Appliance 3.x uses the same CLI for its OCI-compatible Compute Enclave. Any system Repo Compute, networking & storage 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 · Fixes an error · Linux Article Backup & restore · VMs & containers 15 Oct 2026
- 0121 PCA 3.x Service CLI basics: connecting and finding your way around The Service CLI administers the Private Cloud Appliance 3.x Service Enclave. Connect with SSH on port 30006 and use list, show, help,… Intermediate · Cheat sheet · Any system Article Administration & monitoring 15 Oct 2026
- 0111 Fix: can’t lock file ‘/var/lock/qemu-server/lock-VMID.conf’ – got timeout Another task is holding the VM's local lock file, so a new action timed out waiting for it. Find the running or… Intermediate · Fixes an error · Linux Article VMs & containers 15 Oct 2026
- 0122 PCA 3.x health monitoring and upgrade workflow overview How Private Cloud Appliance 3.x reports health (Grafana, Prometheus, Loki, platform health checks) and how appliance upgrades work: ISO images, an upgrade… Advanced · Explains an idea · Linux Article Administration & monitoring 15 Oct 2026
- 0114 proxmox/qemu-server: the Proxmox VE virtual machine manager Read-only GitHub mirror of qemu-server, the Proxmox VE package that manages QEMU/KVM virtual machines and provides the qm and qmrestore commands. Linux Repo Basics · VMs & containers 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 · Explains an idea · Linux Article Basics 15 Oct 2026
- 0103 Proxmox VE networking: Linux bridges (vmbr0) and VLANs Guests reach the network through Linux bridges such as vmbr0, defined in /etc/network/interfaces. Learn the default setup, VLAN-aware bridges, VLAN tags for… Intermediate · Step by step · Linux Article Installation & first steps · Networking & firewalls 15 Oct 2026
- 0105 High availability in Proxmox VE: HA resources, fencing and affinity rules Proxmox VE HA restarts VMs and containers on another node when a node fails. Learn the requirements, how watchdog fencing protects your… Advanced · Explains an idea · Linux Article Clusters & high availability 15 Oct 2026
- 0124 virsh cheat sheet: everyday libvirt commands A quick reference for virsh: list, start, stop and inspect VMs, change CPUs and memory, manage networks, storage pools and snapshots, with… Intermediate · Cheat sheet · Linux Article Basics 15 Oct 2026
- 0112 Fix: TASK ERROR: cluster not ready – no quorum? The node is not part of a quorate cluster, so /etc/pve is read-only and guests cannot be started or changed. Restore the… Advanced · Fixes an error · Linux Article Clusters & high availability 15 Oct 2026
- 0125 Create a KVM virtual machine with virt-install Use virt-install to create libvirt/KVM guests: install from an ISO, run a text-only install over the serial console, or import a cloud… Intermediate · Step by step · Linux Article Basics 15 Oct 2026
- 0126 KVM snapshots and cloning with virsh and virt-clone Take, list, revert and delete libvirt snapshots with virsh, understand internal vs external and disk-only snapshots, and clone a stopped VM with… Advanced · Step by step · Linux Article Basics 15 Oct 2026
- 0106 Back up and restore guests with vzdump, backup jobs and Proxmox Backup Server Back up Proxmox VE VMs and containers with vzdump, choose a backup mode, schedule backup jobs with retention, restore with qmrestore or… Intermediate · Step by step · Linux Article Backup & restore 15 Oct 2026
- 0127 Fix: “Requested operation is not valid: network ‘default’ is not active” A libvirt VM will not start because the virtual network it uses, usually the NAT network 'default', is stopped. Start the network… Intermediate · Fixes an error · Linux Article Basics 15 Oct 2026
- 0109 A vzdump wrapper script with checks, retention and a log file A Bash wrapper around vzdump that checks the target storage first, backs up chosen guests or all guests with zstd and keep-last… Intermediate · Step by step · Linux Script Backup & restore · Shell scripting 15 Oct 2026
- 0128 virsh status report: VMs, state, resources and IPs in one table A read-only bash script that prints a libvirt/KVM host report: virtual networks, storage pools, and every VM with its state, vCPUs, memory,… Intermediate · Cheat sheet · Linux Script Basics 15 Oct 2026
- 0129 libvirt: virtualization API and daemon (GitHub mirror) libvirt is the toolkit that manages KVM/QEMU and other hypervisors through one API, plus the virsh client. The GitHub repository is a… Linux Repo Basics 15 Oct 2026
- 0113 proxmox/pve-manager: Proxmox VE API and web UI Read-only GitHub mirror of pve-manager, which provides the Proxmox VE web interface, much of the REST API, core daemons and tools such… Linux Repo Installation & first steps 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 · Explains an idea · Linux Article Architecture & concepts 15 Oct 2026
- 0100 Create a VM and a cloud-init template with qm Create KVM virtual machines from the command line with qm, then build a reusable cloud-init template from a cloud image and clone… Intermediate · Step by step · Linux Article Basics · VMs & containers 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 · Step by step · Linux Article Installation & first steps · Packages & updates 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 · Explains an idea · Linux Article Basics · Installation & first steps 15 Oct 2026
- 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 · Explains an idea · Linux, macOS, Windows Article Docker basics 15 Oct 2026
- 0056 Docker Compose: run a small web app with a database Docker Compose describes several containers, their ports, volumes and environment in one compose.yaml file, then starts them all with docker compose up. Intermediate · Step by step · Linux, macOS, Windows Article Docker basics · Docker Compose 15 Oct 2026