Issue with controller.sh in chapter 2 code

[ashleydavis]

I've just tried running the shell script controller.sh from the chapter 2 code.

The pod has an error:

> kubectl get pods
NAME                      READY   STATUS   RESTARTS   AGE
sample-5ddbc9bc84-gbdpb   0/1     Error    1          4s

I'm running the shell script under a WSL2 Ubuntu terminal against a Kubernetes cluster running locally under Docker Desktop.

Changing to a more recent version of nginx fixes it.

I changed it from 1.7.9 to 1.14.2 and it works!

I chose 1.14.2 because that's the version from the example in the Kubernetes documentation:
https://kubernetes.io/docs/concepts/workloads/controllers/deployment/

[ashleydavis]

Leaving it a few minutes and the error changes to CrashLoopBackOff:

> kubectl get pods -o wide
NAME                      READY   STATUS             RESTARTS   AGE     IP          NODE             NOMINATED NODE   READINESS GATES
sample-5ddbc9bc84-gbdpb   0/1     CrashLoopBackOff   4          2m12s   10.1.0.33   docker-desktop   <none>           <none>

[ashleydavis]

Here's the output from describe:

> kubectl describe pod sample-5ddbc9bc84-gbdpb
Name:         sample-5ddbc9bc84-gbdpb
Namespace:    default
Priority:     0
Node:         docker-desktop/192.168.65.4
Start Time:   Wed, 05 May 2021 10:54:34 +1000
Labels:       app=sample
              pod-template-hash=5ddbc9bc84
Annotations:  kubectl.kubernetes.io/restartedAt: Wed May  5 10:54:34 AEST 2021
Status:       Running
IP:           10.1.0.33
IPs:
  IP:           10.1.0.33
Controlled By:  ReplicaSet/sample-5ddbc9bc84
Containers:
  sample:
    Container ID:   docker://4c1bb582f3a68e447ffbc7115573b868d4d69bb309197338f137b9a32b9115a1
    Image:          nginx:1.7.9
    Image ID:       docker-pullable://nginx@sha256:e3456c851a152494c3e4ff5fcc26f240206abac0c9d794affb40e0714846c451
    Port:           80/TCP
    Host Port:      0/TCP
    State:          Waiting
      Reason:       CrashLoopBackOff
    Last State:     Terminated
      Reason:       Error
      Exit Code:    139
      Started:      Wed, 05 May 2021 10:57:31 +1000
      Finished:     Wed, 05 May 2021 10:57:31 +1000
    Ready:          False
    Restart Count:  5
    Environment:    <none>
    Mounts:
      /usr/share/nginx/html from data (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-zh5tv (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             False
  ContainersReady   False
  PodScheduled      True
Volumes:
  data:
    Type:      ConfigMap (a volume populated by a ConfigMap)
    Name:      sample
    Optional:  false
  default-token-zh5tv:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-zh5tv
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                 node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
  Type     Reason     Age                   From               Message
  ----     ------     ----                  ----               -------
  Normal   Scheduled  3m12s                 default-scheduler  Successfully assigned default/sample-5ddbc9bc84-gbdpb to docker-desktop
  Normal   Pulled     108s (x5 over 3m11s)  kubelet            Container image "nginx:1.7.9" already present on machine
  Normal   Created    107s (x5 over 3m10s)  kubelet            Created container sample
  Normal   Started    107s (x5 over 3m10s)  kubelet            Started container sample
  Warning  BackOff    81s (x10 over 3m9s)   kubelet            Back-off restarting failed container

[ashleydavis]

The logs command returns nothing:

> kubectl logs sample-5ddbc9bc84-gbdpb

[ashleydavis]

As I said I got it working by updating the nginx version number, but I'd be interested to know why there is a problem with the older version.

Please let me know if you have any ideas on this.

[billyy]

Thanks for highlighting the version. We will update the text to reflect the version.