EEdukron DevOps Library
OperationsAdvanced16 submodules

Production Troubleshooting and Recovery

Diagnose failures across pipelines, deployments, HTTP responses, compute resources, storage, networks, DNS, certificates, Kubernetes, databases, and application latency without increasing impact.

How this module works

From concept to production evidence

Establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

Learning outcomes

  • Triage pipeline and deployment failures
  • Interpret 4xx, 5xx, resource, disk, network, DNS, and TLS symptoms
  • Diagnose Kubernetes failure states
  • Separate database, dependency, and application latency
  • Choose safe rollback or forward recovery

Flow diagram

Production Troubleshooting and Recovery end-to-end flow

Use this sequence as the operating backbone for every submodule note and hands-on exercise.

  1. 01
    Detect symptomProduction Troubleshooting and Recovery stage 1: detect symptom with an auditable result before the next stage begins.
  2. 02
    Declare impactProduction Troubleshooting and Recovery stage 2: declare impact with an auditable result before the next stage begins.
  3. 03
    Compare recent changeProduction Troubleshooting and Recovery stage 3: compare recent change with an auditable result before the next stage begins.
  4. 04
    Collect layer evidenceProduction Troubleshooting and Recovery stage 4: collect layer evidence with an auditable result before the next stage begins.
  5. 05
    Mitigate or roll backProduction Troubleshooting and Recovery stage 5: mitigate or roll back with an auditable result before the next stage begins.
  6. 06
    Verify and prevent recurrenceProduction Troubleshooting and Recovery stage 6: verify and prevent recurrence with an auditable result before the next stage begins.

Integrated hands-on lab

Run a multi-layer incident exercise

  1. Inject a controlled application fault
  2. Build a timeline and hypotheses
  3. Use logs, metrics, events, and traces
  4. Mitigate and validate
  5. Write permanent prevention and alert improvements

Complete module contents

16 full submodule notes

Read in order
01

Pipeline failures

Pipeline failures restores a safe service state while preserving evidence and reducing the chance that mitigation introduces a second failure within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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02

Deployment failures

Deployment failures restores a safe service state while preserving evidence and reducing the chance that mitigation introduces a second failure within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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03

4xx/5xx errors

4xx/5xx errors restores a safe service state while preserving evidence and reducing the chance that mitigation introduces a second failure within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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04

High CPU

High CPU restores a safe service state while preserving evidence and reducing the chance that mitigation introduces a second failure within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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05

High memory

High memory restores a safe service state while preserving evidence and reducing the chance that mitigation introduces a second failure within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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06

Disk issues

Disk issues preserves durable information with explicit ownership, consistency, access, lifecycle, replication, and recovery guarantees within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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07

Network issues

Network issues governs how a request is named, addressed, routed, filtered, transported, protected, and delivered to a healthy endpoint within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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08

DNS issues

DNS issues governs how a request is named, addressed, routed, filtered, transported, protected, and delivered to a healthy endpoint within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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09

Certificate issues

Certificate issues controls which actor may perform which action on which resource, under which conditions, with evidence that can be reviewed later within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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10

CrashLoopBackOff

CrashLoopBackOff restores a safe service state while preserving evidence and reducing the chance that mitigation introduces a second failure within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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11

ImagePullBackOff

ImagePullBackOff moves a versioned change toward users through repeatable validation, immutable artifacts, controlled promotion, and recoverable release decisions within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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12

OOMKilled

OOMKilled restores a safe service state while preserving evidence and reducing the chance that mitigation introduces a second failure within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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13

Pending Pods

Pending Pods restores a safe service state while preserving evidence and reducing the chance that mitigation introduces a second failure within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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14

Database connectivity

Database connectivity preserves durable information with explicit ownership, consistency, access, lifecycle, replication, and recovery guarantees within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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15

Application latency

Application latency provides a concrete platform capability that must be configured, secured, validated, observed, and owned throughout its lifecycle within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

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16

Rollback

Rollback restores a safe service state while preserving evidence and reducing the chance that mitigation introduces a second failure within Production Troubleshooting and Recovery. It is not an isolated definition: its value appears when it supports establish scope and recent change, preserve evidence, follow the service path, use discriminating tests to eliminate layers, mitigate quickly, validate recovery, and only then complete root cause and prevention.

Open full notes