kubectl get namespaces
- Docker & Kubernetes course
- Intermediate
- Lesson 56/82
- 4 min
Learn to list Namespaces.
kubectl get namespaces
Every cluster comes with a few ready namespaces:
default: objects with no namespace specified.kube-system: Kubernetes's own components.kube-public: small data readable by everyone.kube-node-lease: the nodes' liveness signals.
$ kubectl get namespaces
NAME STATUS AGE
default Active 12d
kube-node-lease Active 12d
kube-public Active 12d
kube-system Active 12dSearching all namespaces
-A (--all-namespaces) lists a type in all namespaces; a NAMESPACE column is added to the output. If you don't know which namespace an object is in, it's the fastest way:
$ kubectl get deploy -A
NAMESPACE NAME READY UP-TO-DATE AVAILABLE
dev web 1/1 1 1
prod web 3/3 3 3
kube-system coredns 2/2 2 2Practice Scan the namespaces
Write two commands: list the namespaces; list the deployments in all namespaces.
Starter code
# buraya yazSample solution
kubectl get namespaces
kubectl get deployments -AExpected output
NAME STATUS AGE default Active 12d dev Active 3d kube-system Active 12d NAMESPACE NAME READY UP-TO-DATE AVAILABLE AGE dev web 1/1 1 1 3d kube-system coredns 2/2 2 2 12d
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 Why isn't installing your own applications in kube-system recommended?
- Pods don't run there
- It's slower
- They mix with system components; something critical may be changed by mistake Correct answer
- It's forbidden
Explanation: Applications are kept in their own namespaces.
2 List the namespaces using the abbreviation.
Question
kubectl get ____
Answer
kubectl get nsExplanation: ns is the abbreviation of namespaces.
3 Match.
| Term | Meaning |
|---|---|
default |
Unspecified ones |
kube-system |
System components |
kube-node-lease |
Node liveness |
-A |
All namespaces |