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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
devops

What Is Keycloak and How Does It Work?

Learn what Keycloak is, how its login and SSO flow works, and how realms, clients, users, roles, LDAP federation, identity brokering, OIDC and SAML fit together.

Deepak Prasad12 min read
linux

Fix "watchdog: BUG: soft lockup - CPU stuck" on Linux

Diagnose watchdog BUG soft lockup CPU stuck on Linux from the kernel journal and stack trace. Separate VM starvation, workload pressure, storage stalls, and real driver bugs before changing watchdog_thresh.

Deepak Prasad20 min read
devops

How to Reset Keycloak Admin Password and Recover Access

Reset a lost Keycloak admin password with bootstrap-admin user, repair the permanent administrator, and remove OTP lockout with bootstrap-admin service when the Admin Console is unreachable.

Deepak Prasad9 min read
devops

Keycloak Bootstrap Admin: Create the Initial Admin User

Create Keycloak’s first administrator in the master realm with KC_BOOTSTRAP_ADMIN_USERNAME, the Welcome Page, or bootstrap-admin before the first server start.

Deepak Prasad8 min read
devops

Keycloak Service Accounts: Client Credentials Flow for Machine-to-Machine Auth

Enable Keycloak service accounts and request client_credentials tokens for machine-to-machine auth—assign roles, fix role intersection with client scopes, call orders-api with curl, and troubleshoot invalid_client on …

Deepak Prasad12 min read
devops

Keycloak Realms Explained: Isolation, Multi-Tenancy, and the Master Realm

Learn what a Keycloak realm contains, how realm isolation differs from groups and Organizations, when to add another realm, and why the master realm is for administration—not application users.

Deepak Prasad12 min read
security

L3MON Android RAT Tutorial: Kali Linux Lab and Detection

Test archived L3MON on Kali with Genymotion: start the panel, patch and install a lab APK, verify client behavior, then analyze the APK with aapt, apktool, and JADX.

Kennedy Muthii19 min read
security

Canarytokens Tutorial: Create, Deploy and Test Honeytokens

Create Thinkst Canarytokens on canarytokens.org, test a Web bug from Kali with curl, read the alert history, then choose document, AWS, Kubernetes, cloned-site, and MCP honeytokens for authorized detection.

Kennedy Muthii17 min read
security

Ghost Framework Android Tutorial: ADB Testing with Kali Linux

Install Ghost Framework 8.0.0 on Kali, connect it to a Genymotion Android 10 guest over ADB, enumerate the device, and compare Ghost commands with direct adb shell in an authorized lab.

Kennedy Muthii13 min read
security

Android Lock Screen Bypass with ADB: What Still Works?

Test the old ADB Android lock screen bypass claims on rooted Genymotion, see why gesture.key fails on modern Android, and learn which recovery options still apply.

Kennedy Muthii16 min read
security

Zphisher Tutorial: How Social Media Phishing Pages Work

Install Zphisher on Kali Linux, run a Facebook-style login template on localhost, submit dummy form data with curl, and inspect auth capture files to see how the phishing workflow works.

Kennedy Muthii11 min read
security

FiercePhish Phishing Framework: Legacy Campaign Management Lab

Review FiercePhish as a legacy Laravel phishing framework: inspect the official installer, note Ubuntu-only limits on modern Linux, and map campaign concepts without live delivery.

Kennedy Muthii13 min read
security

Create and Analyze PDF Payloads with JavaScript and Attachments

Create harmless PDF payload examples with JavaScript, embedded attachments, and URLs, then analyze them on Kali with PDFiD, pdf-parser, ExifTool, and qpdf.

Kennedy Muthii20 min read
security

FTK Imager Tutorial: Create and Verify a Forensic Disk Image

Create a forensic disk image with Exterro FTK Imager, choose E01 settings, record evidence metadata, verify MD5 and SHA1 hashes, mount the image read-only, and keep acquisition logs.

Kennedy Muthii16 min read
security

Test Web Login Brute-Force Protection with Hydra and Burp Suite

Test DVWA web login brute-force protection on Kali with a small password list, Hydra http-get-form, Burp Intruder, CSRF and rate-limit caveats, and false-positive checks.

Kennedy Muthii14 min read
security

Browser-in-the-Browser (BITB) Phishing Attack Explained

Learn how Browser-in-the-Browser (BITB) phishing fakes an SSO login window inside a real page, how to spot painted address bars, and how passkeys and awareness limit the attack.

Kennedy Muthii14 min read
security

Analyze Phishing Emails with ThePhish, TheHive, Cortex and MISP

Build an authorized ThePhish lab on Kali with TheHive 4 and Cortex, submit a sanitized .eml sample, review observables and analyzer verdicts, and see where MISP fits.

Kennedy Muthii20 min read
security

Andriller Android Forensics Tutorial: ADB Extraction and Artifact Analysis

Install Andriller CE 3.6.3 on Kali, create known Genymotion artifacts, run an ADB acquisition, and verify SMS, call logs, and SQLite data in the HTML report.

Kennedy Muthii16 min read
security

Apktool Tutorial: Decompile, Modify, Rebuild and Sign APKs

Install Apktool 3.0.3 on Kali, decode InsecureShop into resources and Smali, make a harmless label change, rebuild with apktool b, sign with apksigner, and install on Genymotion while explaining signature mismatch on …

Kennedy Muthii15 min read
security

Android Insecure Data Storage Testing: SharedPreferences, SQLite & Files

Find InsecureShop cleartext SharedPreferences credentials on rooted Genymotion, then practice SQLite and file inspection with clearly labeled training data and scoped-storage caveats.

Kennedy Muthii18 min read
security

Android Deep Link Security Testing with ADB

Enumerate InsecureShop deep-link intent filters, trigger custom schemes with adb, attack weak URL validation, and check App Links verification state.

Kennedy Muthii18 min read
security

Drozer Android Pentesting Tutorial

Install Drozer 3.1.0 and the matching Agent on Kali and Genymotion, enumerate InsecureShop components, start an exported activity, and inspect a permission-gated content provider with careful result wording.

Kennedy Muthii15 min read
security

Android Exported Components Security Testing

Find android:exported activities, services, and receivers in InsecureShop, prove reachability with adb and Drozer, and show why export alone is not a vulnerability.

Kennedy Muthii16 min read
security

Objection Android Pentesting Tutorial

Install Objection 1.12.5 on Kali, attach to InsecureShop through frida-server on rooted Genymotion, enumerate components and storage paths, and try built-in Android jobs for SSL pinning and root detection before writing …

Kennedy Muthii15 min read
security

Frida Android Tutorial: frida-server, ADB and Runtime Hooking

Pin Frida 17.17.0 on Kali, install a matching frida-server on rooted Genymotion, enumerate InsecureShop, and hook Java methods to observe and modify runtime values over ADB.

Kennedy Muthii13 min read
security

Android SSL Pinning Bypass with Frida and Burp Suite

Prove Burp CA trust first, identify Android certificate pinning, then bypass Network Security Config and OkHttp pins with Objection and targeted Frida scripts on an authorized training APK so HTTPS appears in Burp.

Kennedy Muthii19 min read
security

How to Intercept Android App HTTPS Traffic with Burp Suite

Route an Android emulator or device through Burp Suite on Kali, install the Burp CA for your Android version, verify HTTPS in a browser first, then diagnose proxy and trust issues before testing apps.

Kennedy Muthii18 min read
security

Genymotion Android Pentest Lab: Install, Root & Connect ADB

Install Genymotion Desktop Pro on the physical host, create a rooted Android 10 device, fix VirtualBox host-only networking, and connect from Kali with adb for MobSF dynamic analysis.

Deepak Prasad12 min read
security

Penetration Testing Lab Requirements: RAM, Disk, and Server Options

Plan a CompTIA PenTest+ lab as four groups instead of one giant build: start with a local VirtualBox lab, add GOAD-Light for Active Directory lessons, then cloud-native and hosted targets only when those topics appear. …

Deepak Prasad21 min read
security

MobSF Tutorial: Static and Dynamic Android App Security Testing

Run MobSF 4.5.2 in Docker on Kali, scan the InsecureShop APK, triage static findings against MASVS, and validate an exported activity on Genymotion with the Dynamic Analyzer.

Kennedy Muthii15 min read