DevOps: What is Kubernetes Pod Lifecycle Policy?

1apiVersion: apps/v1
2kind: Deployment
3metadata:
4  name: myapp
5spec:
6  replicas: 3
7  template:
8    metadata:
9      labels:
10        app: myapp
11    spec:
12      terminationGracePeriodSeconds: 30
13      activeDeadlineSeconds: 3600
14      containers:
15      - name: app
16        image: myapp:latest
17        lifecycle:
18          postStart:
19            exec:
20              command: ["sh", "-c", "echo started > /tmp/ready"]
21          preStop:
22            exec:
23              command: ["sh", "-c", "sleep 5 && kill -TERM 1"]
24        startupProbe:
25          httpGet:
26            path: /healthz
27            port: 8080
28          failureThreshold: 30
29          periodSeconds: 10
30        readinessProbe:
31          httpGet:
32            path: /ready
33            port: 8080
34          initialDelaySeconds: 5
35          periodSeconds: 10
36        livenessProbe:
37          httpGet:
38            path: /healthz
39            port: 8080
40          initialDelaySeconds: 15
41          periodSeconds: 20

1# Check Pod conditions
2kubectl get pod my-pod -o jsonpath='{.status.conditions}' | jq
3
4# Check restart count
5kubectl get pod my-pod -o jsonpath='{.status.containerStatuses[*].restartCount}'
6
7# Check last state
8kubectl get pod my-pod -o jsonpath='{.status.containerStatuses[*].lastState}' | jq
9
10# Force delete stuck Pod
11kubectl delete pod my-pod --force --grace-period=0
12
13# Check events
14kubectl get events --field-selector involvedObject.name=my-pod