====== spec ======

spec defines the **desired state of the object**.

This is the most important part of any Kubernetes YAML.

---

===== What it contains =====

Depends on the object:

  * Pod → containers
  * Deployment → replicas + pod template
  * Service → ports + selector
  * Volume → storage config

---

===== Example (Pod) =====


spec:
containers:
- name: nginx
image: nginx


---

===== Example (Deployment) =====


spec:
replicas: 3
selector:
matchLabels:
app: web


---

===== Real-world analogy =====

spec = "what you want the system to achieve"

Example:
  * "I want 3 running pods"
  * "I want nginx container"
  * "I want traffic exposed on port 80"

---

===== Key idea =====

spec is the **instruction set for Kubernetes reconciliation loop**