Pod
- This is smallest deployable units of computing in k8s
- A Pod consists of one or more containers with shared network and storage resources
- Each Pod will recieve a unique ip address
- To create any object in k8s we need to create a template
- To write the spec navigate to api reference Refer Here
- Refer Here for the pods specs created
- Now lets try to apply the pod spec created
- Each pod will get one ip address
kubernetes namespace
- K8s supports multiple virtual cluster backed by same physical cluster and these virtual clusters are called as namespace
- In k8s for any object we have two kinds of scopes
- cluster scope
- namespace scope
Commonly used kubectl commands
- get object: In the resources which are scoped to namespace we can use -n to specify the namespace
kubectl get pods -n default
- describe object-type object-name:
- logs object-name:
- apply -f filename.yaml
- Other Commands
- We can use short names
- To get to know the information of cluster
Kubernetes HTTP Request Flow
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HTTP Request flow
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Restful api Refer Here
The K8s API
- K8s api uses JSON over http for its requests and responses.
- k8s api allows clients to create, update, delete or read the description of object via standard http methods
- Trace the HTTP requests: To trace http request we will be using kubectl get pods -n kube-system. To this we will be adding verbose level –v=8
kubectl get pods -n kube-system --v=8
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