13. Kubernetes Debugging
** Example:1 - With error ***
vi my-nginx-err.yaml
apiVersion: v1
kind: Pod
metadata:
name: my-nginx-err-pod
spec:
containers:
name: my-nginx-err-container
image: ngnx
kubectl create -f my-nginx-err.yaml
kubectl get pods
kubectl describe pod my-nginx-err-pod
kubectl logs my-nginx-err-pod
kubectl edit pods my-nginx-err-pod
kubectl get pods
** Example:2 with errors **
vi my-nginx-export.yaml
apiVersion: v1
kind: Pod
metadata:
name: my-nginx-export-pod
spec:
containers:
name: my-nginx-export-container
image: nginx:119
kubectl create -f my-nginx-export.yaml
kubectl get pod my-nginx-export-pod
kubectl edit pods my-nginx-export-pod
****** adding liveness probe.
spec:
containers:
image: nginx:1.19
imagePullPolicy: IfNotPresent
name: my-nginx-export-container
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
volumeMounts:
mountPath: /var/run/secrets/kubernetes.io/serviceaccount
name: default-token-vfbjq
readOnly: true
livenessProbe:
httpGet:
path: /
port: 80
*********************************
kubectl get pod my-nginx-export-pod -o yaml # my-nginx-export2.yaml
kubectl delete pod my-nginx-export-pod --now
***** edit the pod specification and re-create the pod.
correct the nginx tag to 1.19 and also add liveness probe.
vi my-nginx-export2.yaml
spec:
containers:
image: nginx:1.19
imagePullPolicy: IfNotPresent
name: my-nginx-export-container
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
volumeMounts:
mountPath: /var/run/secrets/kubernetes.io/serviceaccount
name: default-token-vfbjq
readOnly: true
livenessProbe:
httpGet:
path: /
port: 80
********************
kubectl apply -f my-nginx-export2.yaml
kubectl get pods
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