[Kubernetes] YAML

YAML (YAML Ain’t Markup Language) is a human-readable data serialization format, often used for configuration files, especially in tools like Kubernetes, Docker Compose, and Ansible.

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🧠 YAML Concepts

1. Key-Value Pairs
   Basic structure is key: value.
2. Indentation Matters
   YAML uses indentation (spaces only) to define structure. No tabs allowed.
3. Lists
   Represented with dashes -.
4. Nested Structures
   Keys can contain maps (dictionaries) or lists.
5. Scalars
   Basic values: strings, numbers, booleans.
6. Comments
   Start with #.

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🧱 Basic YAML Structure Example

name: MyApp
version: 1.0
enabled: true
ports:
  - 8080
  - 443
database:
  host: localhost
  port: 3306
  user: admin
  password: secret

 ※ Tistory doesn't support .yaml format

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📦 Kubernetes YAML Structure Example

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
  labels:
    app: demo
spec:
  containers:
    - name: my-container
      image: nginx:latest
      ports:
        - containerPort: 80

🔍 Breakdown:

• apiVersion, kind, metadata, spec — top-level keys
• containers — a list
• name, image, ports — keys inside list item

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