StatefulSet, DaemonSet, Job и CronJob

mkdir -p /tmp/k8s-m12
cat > /tmp/k8s-m12/workloads.yaml <<'EOF'
apiVersion: v1
kind: Namespace
metadata: {name: k8s-m12}
---
apiVersion: v1
kind: Service
metadata: {name: peers, namespace: k8s-m12}
spec:
  clusterIP: None
  selector: {app: stateful-web}
  ports: [{name: http, port: 80}]
---
apiVersion: apps/v1
kind: StatefulSet
metadata: {name: web, namespace: k8s-m12}
spec:
  serviceName: peers
  replicas: 2
  selector: {matchLabels: {app: stateful-web}}
  template:
    metadata: {labels: {app: stateful-web}}
    spec:
      containers:
      - name: nginx
        image: nginx:1.29-alpine
        command: ["sh", "-c"]
        args: ["printf 'pod=%s\n' "$HOSTNAME" > /usr/share/nginx/html/index.html; exec nginx -g 'daemon off;'"]
        ports: [{name: http, containerPort: 80}]
        readinessProbe: {httpGet: {path: /, port: http}, periodSeconds: 2}
---
apiVersion: apps/v1
kind: DaemonSet
metadata: {name: node-agent, namespace: k8s-m12}
spec:
  selector: {matchLabels: {app: node-agent}}
  template:
    metadata: {labels: {app: node-agent}}
    spec:
      containers:
      - name: agent
        image: busybox:1.37
        command: ["sh", "-c", "echo node=$NODE_NAME; sleep 3600"]
        env: [{name: NODE_NAME, valueFrom: {fieldRef: {fieldPath: spec.nodeName}}}]
---
apiVersion: batch/v1
kind: Job
metadata: {name: batch, namespace: k8s-m12}
spec:
  completions: 3
  parallelism: 2
  backoffLimit: 2
  template:
    spec:
      restartPolicy: Never
      containers:
      - {name: task, image: busybox:1.37, command: ["sh", "-c", "echo completed-by=$HOSTNAME; sleep 2"]}
---
apiVersion: batch/v1
kind: CronJob
metadata: {name: report, namespace: k8s-m12}
spec:
  schedule: "*/5 * * * *"
  timeZone: Etc/UTC
  concurrencyPolicy: Forbid
  successfulJobsHistoryLimit: 2
  failedJobsHistoryLimit: 1
  jobTemplate:
    spec:
      template:
        spec:
          restartPolicy: Never
          containers:
          - {name: report, image: busybox:1.37, command: ["sh", "-c", "date -Iseconds; echo report=$HOSTNAME"]}
EOF
kubectl apply -f /tmp/k8s-m12/workloads.yaml || true
kubectl apply --dry-run=server -f /tmp/k8s-m12/workloads.yaml
kubectl apply -f /tmp/k8s-m12/workloads.yaml

kubectl -n k8s-m12 rollout status statefulset/web --timeout=180s
kubectl -n k8s-m12 get statefulset,pod -l app=stateful-web -o wide
kubectl -n k8s-m12 run dns-client --image=busybox:1.37 --restart=Never --command -- sleep 3600
kubectl -n k8s-m12 wait --for=condition=Ready pod/dns-client --timeout=120s
kubectl -n k8s-m12 exec dns-client -- nslookup web-0.peers
kubectl -n k8s-m12 exec dns-client -- nslookup web-1.peers
old_uid=$(kubectl -n k8s-m12 get pod web-0 -o jsonpath='{.metadata.uid}')
kubectl -n k8s-m12 delete pod web-0 --wait=true
kubectl -n k8s-m12 wait --for=condition=Ready pod/web-0 --timeout=120s
kubectl -n k8s-m12 get pod web-0 -o jsonpath='name={.metadata.name}{" uid="}{.metadata.uid}{"\n"}'
printf 'old uid=%s\n' "$old_uid"

kubectl -n k8s-m12 rollout status daemonset/node-agent --timeout=120s
kubectl get nodes -o wide
kubectl -n k8s-m12 get daemonset node-agent
kubectl -n k8s-m12 get pods -l app=node-agent -o custom-columns=POD:.metadata.name,NODE:.spec.nodeName,OWNER:.metadata.ownerReferences[0].kind
kubectl -n k8s-m12 logs -l app=node-agent --prefix

kubectl -n k8s-m12 wait --for=condition=Complete job/batch --timeout=120s
kubectl -n k8s-m12 get job batch
kubectl -n k8s-m12 get pods -l job-name=batch
kubectl -n k8s-m12 logs job/batch --prefix

kubectl -n k8s-m12 create job report-now --from=cronjob/report
kubectl -n k8s-m12 wait --for=condition=Complete job/report-now --timeout=120s
kubectl -n k8s-m12 logs job/report-now
kubectl -n k8s-m12 get cronjob report -o yaml

cat > /tmp/k8s-m12/failing-job.yaml <<'EOF'
apiVersion: batch/v1
kind: Job
metadata: {name: failing, namespace: k8s-m12}
spec:
  backoffLimit: 2
  template:
    spec:
      restartPolicy: Never
      containers:
      - {name: task, image: busybox:1.37, command: ["sh", "-c", "echo deliberate failure >&2; exit 42"]}
EOF
kubectl apply --dry-run=server -f /tmp/k8s-m12/failing-job.yaml
kubectl apply -f /tmp/k8s-m12/failing-job.yaml
kubectl -n k8s-m12 wait --for=condition=Failed job/failing --timeout=120s
kubectl -n k8s-m12 get job failing -o wide
kubectl -n k8s-m12 get pods -l job-name=failing
kubectl -n k8s-m12 logs job/failing --prefix
kubectl -n k8s-m12 describe job failing
kubectl -n k8s-m12 get events --sort-by=.metadata.creationTimestamp

kubectl delete namespace k8s-m12 --wait=true
rm -rf /tmp/k8s-m12
kubectl get namespace k8s-m12 2>&1 || true