Troubleshooting Archives - ITFROMZERO

Diagnosing and Resolving MySQL Deadlocks: InnoDB Log Analysis and Lock Ordering Techniques

By IT From Zero November 7, 2026

A hands-on guide to resolving production MySQL deadlocks at 2 AM. Learn to analyze SHOW ENGINE INNODB STATUS logs, configure innodb_print_all_deadlocks, and design transactions to eliminate circular waits.

VMware

Fixing vCenter 503 Errors Caused by Expired STS Certificates Using fixsts.py

By IT From Zero November 2, 2026

A comprehensive guide to resolving vCenter 503 errors and downtime caused by expired STS Signing Certificates. Safely recover both standalone and Enhanced Linked Mode environments using fixsts.py.

Network

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.