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Browse the latest tutorials, guides, and practical examples across Linux, DevOps, security, databases, and programming on GoLinuxCloud.

Explore the latest tutorials and guides across Linux, DevOps, programming, and more.

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3098 articles

Blog illustration with latest articles, tutorials, guides, and how-to content across Linux and DevOps topics
security

Infoooze OSINT Tool: Install and Examples on Kali Linux

Install Infoooze 1.3.1 on Kali Linux and run OSINT modules for port scanning, user-agent parsing, EXIF extraction, username recon, and HTTP headers in an authorized lab.

Kennedy Muthii10 min read
security

OWASP Nettacker: Automated Pentesting Framework Tutorial

Install and run OWASP Nettacker 0.4.0 on Kali Linux with Docker, scan Metasploitable 2 using the port_scan module, and start the optional web UI with --start-api in an authorized lab.

Kennedy Muthii11 min read
security

Install Node.js and npm on Kali Linux

Install Node.js and npm on Kali Linux from the rolling apt repository or per-user nvm, run a test script, switch versions with .nvmrc, and fix path and permission errors without NodeSource scripts.

Kennedy Muthii11 min read
security

Install .deb Files on Kali Linux

Install .deb files on Kali Linux with apt install ./package.deb, inspect packages with dpkg-deb, fix broken dependencies, verify architecture, and remove or purge local installs safely.

Kennedy Muthii12 min read
security

Kali Linux Repositories Explained

Configure Kali Linux repositories in deb822 kali.sources, compare rolling and snapshot branches, add third-party repos safely with Signed-By, and fix common apt update errors on Kali Rolling 2026.2.

Kennedy Muthii11 min read
security

Install Tor Browser on Kali Linux

Install Tor Browser on Kali Linux from the official signed archive when torbrowser-launcher is missing, verify with GPG, launch without root, and troubleshoot connection and clock issues.

Kennedy Muthii8 min read
security

PostgreSQL Brute Force Attack Tools and Examples on Kali Linux

Learn PostgreSQL brute force testing on Kali Linux with Hydra, Ncrack, Patator, Metasploit postgres_login, and Nmap pgsql-brute against Metasploitable PostgreSQL 8.3 on port 5432 in an authorized lab.

Kennedy Muthii11 min read
security

Learn Hacking with Metasploitable 2: Metasploit Walkthrough on Kali Linux

Practice Metasploitable 2 exploitation on Kali Linux: Nmap service discovery, Metasploit module mapping, and root shells via vsFTPd, VNC, and Samba in your own lab.

Kennedy Muthii17 min read
linux

Install DVWA on Kali Linux

Install DVWA on Kali Linux with the native dvwa package, Docker Compose, or a manual Apache and MariaDB stack, then verify port 42001 or 4280 and fix common setup errors.

Deepak Prasad14 min read
linux

Install OWASP Juice Shop on Kali Linux

Install OWASP Juice Shop on Kali Linux using the native package, Docker, or Node.js source, then verify access, connect Burp Suite, and fix common errors.

Deepak Prasad14 min read
devops

Cordon, Drain and Uncordon Kubernetes Nodes

Use kubectl cordon, drain, and uncordon to mark a node unschedulable, evict workloads safely with PodDisruptionBudget awareness, and return the node to service after maintenance.

Deepak Prasad16 min read
devops

Configure a Highly Available Kubernetes Control Plane with kubeadm

Build a kubeadm HA control plane with stacked etcd, HAProxy and Keepalived, control-plane joins, and tested API-server and load-balancer failover.

Deepak Prasad24 min read
devops

Check Kubernetes Cluster, Client and Node Versions

Check Kubernetes API-server, kubectl, kubelet, kubeadm, container runtime, and control-plane versions, then compare supported version skew.

Deepak Prasad11 min read
devops

Kubernetes Runtime Security with Falco

Deploy Falco on Kubernetes with Helm and modern eBPF, verify syscall collection, trigger runtime alerts, and write and tune custom rules.

Deepak Prasad16 min read
devops

Kubernetes Incident Response and Forensics

Investigate a Kubernetes incident with Falco and audit logs, preserve evidence, contain workloads and nodes, rotate credentials, and redeploy safely.

Deepak Prasad17 min read
devops

Kubernetes Audit Logging with Policy Examples

Enable Kubernetes audit logging on a kubeadm API server, apply a focused policy, generate test events, and trace RBAC, Secret, exec, and denied requests.

Deepak Prasad14 min read
devops

Build Immutable Containers in Kubernetes

Build immutable Kubernetes containers with digest-pinned images, read-only roots, non-root execution, dropped capabilities, and explicit writable volumes.

Deepak Prasad13 min read
devops

Secure Container Image Promotion in CI/CD

Promote one container image digest through Trivy scanning, SBOM archival, Cosign signing, registry copy, and Kubernetes drift verification.

Deepak Prasad11 min read
devops

Enable Istio Mutual TLS with PeerAuthentication

Configure Istio PeerAuthentication in PERMISSIVE and STRICT modes, verify workload certificates and sidecar TLS behavior, and block plaintext clients that lack mesh identity.

Deepak Prasad14 min read
devops

Scan Kubernetes YAML with Kubesec and KubeLinter

Scan Kubernetes YAML with Kubesec and KubeLinter, compare findings, lint rendered Helm and Kustomize manifests, enforce CI checks, and verify remediation.

Deepak Prasad13 min read
devops

Sign and Verify Container Images with Cosign

Sign and verify container images with Cosign using local keys and keyless identities, attach SPDX attestations, and test failed verification.

Deepak Prasad13 min read
devops

Allow Trusted Images with ImagePolicyWebhook

Configure Kubernetes ImagePolicyWebhook with an HTTPS ImageReview service, digest rules, TTL caching, and fail-open or fail-closed admission tests.

Deepak Prasad14 min read
devops

Generate and Scan Container SBOMs with Trivy

Generate CycloneDX and SPDX SBOMs with Trivy, rescan stored inventories for vulnerabilities, compare formats, and archive digest-linked release artifacts.

Deepak Prasad12 min read
devops

Build Secure Minimal Container Images

Build secure minimal container images with multi-stage Dockerfiles, distroless bases, non-root users, digest pins, secret mounts, and runtime checks.

Deepak Prasad14 min read
devops

Encrypt Kubernetes Pod Traffic with Cilium WireGuard

Enable Cilium transparent WireGuard encryption on a running cluster, verify peers and handshake state, capture plaintext versus encrypted cross-node Pod traffic, and document what traffic stays outside the tunnel.

Deepak Prasad16 min read
devops

Scan Container Images for Vulnerabilities with Trivy

Scan container images with Trivy, filter vulnerabilities by severity, enforce CI exit codes, manage ignores, export reports, and verify rebuilt images.

Deepak Prasad12 min read
devops

Kubernetes Multi-Tenancy and Workload Isolation

Compare Kubernetes multi-tenancy models and validate namespace isolation with RBAC, NetworkPolicy, Pod Security, quotas, nodes, and clusters.

Deepak Prasad14 min read
devops

Harden Linux Nodes for Kubernetes

Audit and harden kubeadm Linux nodes by reducing services, securing SSH and Kubernetes files, mapping firewall paths, patching safely, and validating readiness.

Deepak Prasad20 min read
devops

Use seccomp Profiles in Kubernetes

Apply Kubernetes seccompProfile types Unconfined, RuntimeDefault, and Localhost on Pods and containers, install a custom profile on the kubelet seccomp path, and diagnose denied syscalls with logs and exit codes.

Deepak Prasad11 min read
devops

Harden Kubernetes API Server Access

Audit the kube-apiserver static Pod manifest on a kubeadm control plane, review TLS, anonymous access, authorization, admission, and ServiceAccount issuer settings, apply one hardening change safely, and validate health …

Deepak Prasad14 min read