issue-847-reproducer

issue-847-repro.sh

#!/bin/bash

curl -sfL https://get.k3s.io | sh -
while ! sudo kubectl get node ; do
  sleep 1
done

cat >manifest.yml <<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: io-test
  labels: 
    app: io-test
spec:
  replicas: 3
  selector:
    matchLabels:
      app: io-test
  template:
    metadata:
      labels:
        app: io-test
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
              - matchExpressions:
                  - key: kubernetes.io/hostname
                    operator: In
                    values:
                      - $HOSTNAME
      containers:
        - name: io-test
          image: golang:1.19.1
          command:
          - bash
          - -c
          - |
            apt update && apt install time -y
            echo '
              package main

              import (
                "fmt"
                "log"
                "os"
              )

              func main() {
                suffix := ""
                if len(os.Args) > 1 {
                  suffix = os.Args[1]
                }

                err := run(suffix)
                if err != nil {
                  log.Fatal(err)
                }
              }

              func run(suffix string) error {
                for i := 0; i < 100_000; i++ {
                  if i%10_000 == 0 {
                    log.Printf("file #%d", i)
                  }

                  path := fmt.Sprintf("file_%d_%s", i, suffix)
                  content := path
                  err := os.WriteFile(path, []byte(content), 0644)
                  if err != nil {
                    return err
                  }
                }

                return nil
              }
            ' >> /test/main.go
            cd /test
            go build main.go

            while true
            do
              time ./main \$(date +%s)
            done
          volumeMounts:
          - name: io-test
            mountPath: "/test"
      restartPolicy: Always
      volumes:
        - name: io-test
          emptyDir: {}
EOF

sudo kubectl apply -f manifest.yml
sudo kubectl get pods -w