Creating a Namespace

Learn to create a Namespace with kubectl create namespace.

Creating namespaces

A namespace is created with a command or with YAML. The name must consist of lowercase letters, digits and hyphens. Objects are placed in a namespace in YAML with metadata.namespace:

kubectl create namespace dev

apiVersion: v1
kind: Namespace
metadata:
  name: prod
  labels:
    ortam: uretim
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: api-ayar
  namespace: prod
data:
  LOG_LEVEL: warn

Resource quota

A ResourceQuota limits the total CPU, memory and object count a namespace can consume. While a quota exists, every container in the namespace must write requests/limits; a LimitRange gives defaults for those that don't:

apiVersion: v1
kind: ResourceQuota
metadata:
  name: dev-kota
  namespace: dev
spec:
  hard:
    requests.cpu: "4"
    requests.memory: 8Gi
    pods: "20"

Exercise An environment namespace

Write two objects in a single YAML file separated by ---: the prod Namespace labelled ortam: uretim; the api-ayar ConfigMap in the prod namespace with LOG_LEVEL: warn under data.

Show example solution

apiVersion: v1
kind: Namespace
metadata:
  name: prod
  labels:
    ortam: uretim
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: api-ayar
  namespace: prod
data:
  LOG_LEVEL: warn

Test yourself

What happens to the objects in a namespace when it is deleted?
- They stop but aren't deleted
- All of them are deleted
- They move to default
- They are kept
Show answer

All of them are deleted — kubectl delete namespace can't be undone; it's used with care.

Place the object in a namespace in YAML.

metadata:
  name: api-ayar
  ____: prod

Show answer

metadata:
  name: api-ayar
  namespace: prod

Match.

create namespace

Create a namespace
metadata.namespace

Object's location
ResourceQuota

Total limit
LimitRange

Default request/limit

Next lesson: The -n flag

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