Kubernetes 101: Excercise 2 for CKA (kubectl, pod, yaml file)
Following our journey on the preparation towards the exam CKA (Certified Kubernetes Administrator), we continue this time with the exercise number 2.
Exercise 2:
- create an nginx pod in a default namespace and verify that the pod is running
- delete the pod
- create the same pod nginx with a yaml file
- let's check the output of the yaml file of the pod you just created
Solution:
kubectl run nginx --image=nginix --restart=Never
kubectl get pods
 |
| Creating a pod |
kubectl create -f nginx-pod.yaml
kubectl delete pod nginx
kubectl create -f nginx-pod.yaml
kubectl get po nginx -o yaml
#Output yaml file
kind: Pod
metadata:
creationTimestamp: "2021-08-05T13:25:46Z"
labels:
run: nginx
managedFields:
- apiVersion: v1
fieldsType: FieldsV1
fieldsV1:
f:status:
f:conditions:
.: {}
k:{"type":"PodScheduled"}:
.: {}
f:lastProbeTime: {}
f:lastTransitionTime: {}
f:message: {}
f:reason: {} f:status: {}
f:type: {}
manager: kube-scheduler
operation: Update
time: "2021-08-05T13:25:46Z"
- apiVersion: v1
fieldsType: FieldsV1
fieldsV1:
f:metadata:
f:labels:
.: {}
f:run: {}
f:spec:
f:containers:
k:{"name":"nginx"}:
.: {}
f:image: {}
f:imagePullPolicy: {}
f:name: {}
f:resources: {}
f:terminationMessagePath: {}
f:terminationMessagePolicy: {}
f:dnsPolicy: {}
f:enableServiceLinks: {}
f:restartPolicy: {}
f:schedulerName: {}
f:securityContext: {}
f:terminationGracePeriodSeconds: {}
manager: kubectl-create
operation: Update
time: "2021-08-05T13:25:46Z"
name: nginx
namespace: default
resourceVersion: "8852"
uid: d09254bf-48f7-432c-86c3-d9d29c921e74
spec:
containers:
- image: ngix
imagePullPolicy: Always
name: nginx
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
volumeMounts:
- mountPath: /var/run/secrets/kubernetes.io/serviceaccount
name: default-token-6zlwd
readOnly: true
dnsPolicy: ClusterFirst
enableServiceLinks: true
preemptionPolicy: PreemptLowerPriority
priority: 0
restartPolicy: Never
schedulerName: default-scheduler
securityContext: {}
serviceAccount: default
serviceAccountName: default
terminationGracePeriodSeconds: 30
tolerations:
- effect: NoExecute
key: node.kubernetes.io/not-ready
operator: Exists
tolerationSeconds: 300
- effect: NoExecute
key: node.kubernetes.io/unreachable
operator: Exists
tolerationSeconds: 300
volumes:
- name: default-token-6zlwd
secret:
defaultMode: 420
secretName: default-token-6zlwd
status:
conditions:
- lastProbeTime: null
lastTransitionTime: "2021-08-05T13:25:46Z"
message: '0/1 nodes are available: 1 node(s) had taint {node-role.kubernetes.io/master:
}, that the pod didn''t tolerate.'
reason: Unschedulable
status: "False"
type: PodScheduled
phase: Pending
qosClass: BestEffort
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