Tag: Troubleshooting
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Failed VKS Cluster Upgrade Recovery Without Deleting Nodes (VCAP-VKS Exam Series, Part 33)
A stalled VKS cluster upgrade is a live reconciliation loop blocked on a precondition, not a crashed job, and deleting the stuck node destroys your evidence without unblocking anything. Here is how to classify the stall from Cluster API conditions and clear it in the right context.
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VKS Registry and Trusted CA Errors in Container Deployment (VCAP-VKS Exam Series, Part 32)
Objective 5.3 as a runbook: separating x509 trust failures from registry authentication failures on a VKS cluster, the double encoded secret the Supervisor expects, and the version window where the fix applies but never reaches containerd.
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VKS VM Class, Cluster Plan and Content Library Fault Diagnosis (VCAP-VKS Exam Series, Part 31)
Objective 5.2 packs five different fault families into a single line of blueprint text. Here is the five gate sweep I use to tell a VM class binding problem from a cluster plan certificate defect, with the real error strings and the surface that actually fixes each one.
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Diagnosing Supervisor and VKS Provisioning and Namespace Errors (VCAP-VKS Exam Series, Part 30)
Objective 5.1 as a runbook: a fixed reading order for Supervisor and VKS provisioning, connectivity and namespace failures, with the real error lines, the controller namespace that moved on VCF 9.0, and the checks that prove each layer.
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Grow Storage With LVM Logical Volumes (Linux for Beginners, Part 22)
Fixed partitions are rigid; LVM puts a flexible layer between disks and filesystems so you can grow a full volume onto a new disk with no downtime. PVs, VGs, LVs, and snapshots.
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Backups With rsync and tar, Done Right (Linux for Beginners, Part 21)
Making copies is easy; making copies you can restore from is the skill. rsync and tar, the trailing-slash trap, space-smart snapshots, and why an untested backup is not a backup.
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Troubleshoot Linux the Methodical Way, Not by Guessing (Linux for Beginners, Part 18)
The admins who fix things fast follow a method, not a hunch. Define the problem, check the cheap causes first, read the signal not just the number, and change one thing at a time.
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Basic Security Hardening for a New Linux Server (Linux for Beginners, Part 17)
A fresh server gets brute-forced within minutes. The five changes that stop almost all automated attacks: patch, key-only SSH, a default-deny firewall, fail2ban, and least privilege.
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Bash Scripting From Scratch for Beginners (Linux for Beginners, Part 16)
Turn the commands you repeat every day into a script that runs itself. Shebangs, variables, arguments, loops, and the one line that stops a script from doing real damage.
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Schedule Tasks in Linux With cron and systemd Timers (Linux for Beginners, Part 15)
cron runs the jobs that keep Linux servers going. Learn crontab syntax, the PATH trap that kills jobs silently, and when a systemd timer does it better.
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How to Use vi and vim to Edit Files in Linux (Linux for Beginners, Part 14)
Open, edit, save, and quit files in Linux with vi and vim: the three modes, the vim-tiny arrow key trap, and how to save a file you do not own.
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How Do You Connect to a Remote Linux Server With SSH? (Linux for Beginners, Part 13)
SSH is how you reach every Linux server you will ever manage. Generate a key, copy it to the server, turn off passwords, and fix the errors that bite.
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Dr Pranay Jha
Dr. Pranay Jha is a Cloud and AI Consultant with 18+ years of experience in hybrid cloud, virtualization, and enterprise infrastructure transformation. He specializes in VMware technologies, multi-cloud strategy, and Generative AI solutions. He holds a PhD in Computer Applications with research focused on Cloud and AI, has published multiple research papers, and has been a VMware vExpert since 2016 and a VMUG Community Leader.
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