Creating a Namespace
- Docker & Kubernetes course
- Intermediate
- Lesson 57/82
- 4 min
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: warnResource 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"Practice 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.
Starter code
# buraya yazSample solution
apiVersion: v1
kind: Namespace
metadata:
name: prod
labels:
ortam: uretim
---
apiVersion: v1
kind: ConfigMap
metadata:
name: api-ayar
namespace: prod
data:
LOG_LEVEL: warnExpected output
namespace/prod created configmap/api-ayar created
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 What happens to the objects in a namespace when it is deleted?
- They stop but aren't deleted
- All of them are deleted Correct answer
- They move to default
- They are kept
Explanation: kubectl delete namespace can't be undone; it's used with care.
2 Place the object in a namespace in YAML.
metadata:
name: api-ayar
____: prodmetadata:
name: api-ayar
namespace: prodExplanation: metadata.namespace is the object's namespace.
3 Match.
| Term | Meaning |
|---|---|
create namespace |
Create a namespace |
metadata.namespace |
Object's location |
ResourceQuota |
Total limit |
LimitRange |
Default request/limit |