Linux Logs
Where Do Linux Logs Live? Two systems coexist on most modern distros: flowchart TB subgraph Sources KERNEL[Kernel Messages] …
Jan 20, 2026
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Troubleshooting
15 articles
DNS Resolution Failures
Overview “Can’t resolve hostname” or intermittent DNS failures are common, and the resolution order Linux actually uses …
Jan 20, 2026
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High Load Average
Overview Load average is one of the most misunderstood Linux metrics. It’s not a CPU percentage — it’s roughly the average …
Jan 20, 2026
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Zombie & Defunct Processes
Overview A zombie (shown as Z or <defunct> in ps) is a process that has already finished executing but whose exit status hasn’t …
Jan 20, 2026
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Permission Denied Errors
Overview “Permission denied” is usually straightforward once you check the right thing — but there are several distinct causes …
Jan 20, 2026
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Network Connectivity Issues
Overview “Can’t connect to X” can fail at any of several layers — the local network interface, routing, DNS, a firewall …
Jan 20, 2026
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Service Won't Start
Overview A systemctl start fails, or a service that should auto-start on boot never comes up. The fix depends entirely on WHY it failed, …
Jan 20, 2026
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Slow Disk I/O
Overview Applications feel slow, but CPU and memory both look fine. The bottleneck is often the disk — either the physical/virtual storage …
Jan 20, 2026
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Disk Full — No Space Left on Device
Overview “No space left on device” can mean the disk is genuinely full, the inode table is exhausted (rarer, but df -h …
Jan 20, 2026
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03-Deployment-concepts-with-real-examples
Kubernetes Core Concepts — Deployment 3.1 What Is a Deployment? A Deployment is the recommended and most commonly used way to manage …
Jan 20, 2026
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High Memory Usage & OOM Kills
Overview A process was unexpectedly killed, or the server is grinding to a halt under memory pressure. Linux’s Out-Of-Memory (OOM) …
Jan 20, 2026
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02 - Replicaset concepts with real examples
Kubernetes Core Concepts — ReplicaSet 2.1 What Is a ReplicaSet? A ReplicaSet is a Kubernetes controller whose job is to ensure that a …
Jan 20, 2026
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High CPU Usage
Overview CPU pegged at 100% (or a load average far above core count) usually has one of two shapes: a single runaway process, or many …
Jan 20, 2026
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01 - Kubernetes Core Concept - Pod
Kubernetes Core Concepts — Pod Before you can deploy real applications on Kubernetes, you need a solid understanding of the three most …
Jan 20, 2026
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Kubernetes Interview Questions & Answers — Scenarios & Troubleshooting
Q1 Pod stuck in CrashLoopBackOff - how do you debug it? Intermediate Ans: # Step 1: Check pod status and events kubectl describe pod …
Jan 1, 0001
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