Troubleshooting Archives - ITFROMZERO

Linux Conntrack Guide: Monitor, Troubleshoot, and Tune the Connection Tracking Table

By IT From Zero October 11, 2026

Learn how to resolve Linux conntrack table exhaustion, troubleshoot packet drops using dmesg, and fine-tune sysctl and hashsize settings for high-traffic workloads.

VMware

How to Safely Reset a Lost or Forgotten ESXi Root Password

By IT From Zero October 9, 2026

Discover 3 safe ways to recover a lost VMware ESXi 7.0/8.0 root password using an Ubuntu Live USB, vCenter Host Profile, or reinstalling without losing VM data.

Git

Git assume-unchanged vs. skip-worktree: How to Safely Ignore Local Config Files

By IT From Zero October 4, 2026

Understand the key differences between assume-unchanged and skip-worktree in Git. Learn how to safely ignore local config changes and prevent data overwrite on git pull.

Artificial Intelligence tutorial - IT technology blog

Using ChromaDB with Python: Build a Lightweight Local Vector Database for AI Applications

By IT From Zero October 2, 2026

Suffering from OOM killer memory crashes due to in-memory NumPy vectors? Here is how to integrate ChromaDB PersistentClient in Python for a lightweight, robust local vector database.

VMware

Resolving the ‘Virtual machine disks consolidation is needed’ Error on VMware vSphere

By IT From Zero September 18, 2026

The 'Virtual machine disks consolidation is needed' error can reduce VM performance by 50%. Check out 3 ways to fix it via vCenter or the SSH command line.

VMware

Fixing MTU Mismatch: When Jumbo Frames Backfire in vSphere Infrastructure

By IT From Zero September 15, 2026

Is your vSphere system lagging or is vMotion stuck at 14%? It might be an MTU Mismatch. Learn how to use vmkping and PowerCLI to diagnose and sync Jumbo Frames 9000 quickly.

VMware

Mastering pktcap-uw on VMware ESXi: The Ultimate Network Debugging Trick for Every Packet

By IT From Zero August 31, 2026

Forget tcpdump-uw; pktcap-uw is the most powerful tool for network troubleshooting on VMware ESXi. A detailed guide on capturing packets at vSwitch and Uplinks and exporting expert-level pcap files.

Monitoring

Mastering lnav: Advanced Real-Time Log Viewing and Analysis on Linux

By IT From Zero August 16, 2026

Don't let log reading become a nightmare. Discover lnav—a powerful Linux tool that merges log files, provides smart highlighting, and supports SQL queries to find errors in seconds.

VMware

Configuring Scratch Partition on VMware ESXi: The Ultimate Fix for Missing Logs and Core Dumps

By IT From Zero August 12, 2026

ESXi hosts installed on SD Cards/USB often lose logs after a reboot. Learn how to configure a Scratch Partition to store System Logs and Core Dumps securely on a Datastore.

VMware

Troubleshooting Purple Screen of Death (PSOD) on VMware ESXi: From Diagnosis to Root Cause Resolution

By IT From Zero August 1, 2026

Don't panic when you see a Purple Screen of Death (PSOD) on VMware ESXi. This guide helps you configure Core Dumps, read driver error codes, and pinpoint hardware failures to recover your system quickly.