Understanding Kubernetes CreateContainerConfigError

Good day. It's Thursday, Sep. 12, and in this issue, we're covering:

• Understanding Kubernetes CreateContainerConfigError

• JFrog Collaborates with NVIDIA to Deliver Secure AI Models

• Oracle announces OCI advancements and key upgrades to its Kubernetes Engine

• How to centralize log management with Cloud Logging

• A Security Analysis of Azure DevOps Job Execution

• An End-to-End Machine Learning (mlops) Project

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Use Case

Understanding Kubernetes CreateContainerConfig Error

Some of you may already know…

CreateContainerConfigError is an error that occurs when Kubernetes fails to create a container due to an incorrect or incomplete configuration in the Pod's container settings, preventing it from generating the required setup for the container.

You can detect the error by running kubectl get pods:

NAME      READY   STATUS                     RESTARTS   AGE
teg-pod   0/1     CreateContainerConfigError  0          11m

Common Causes for CreateContainerConfigError:

When starting a container, Kubernetes uses the generateContainerConfig method to read configuration data, including commands, ConfigMaps, Secrets, and storage.

If Kubernetes can't find these resources, it triggers a CreateContainerConfigError.

How to Troubleshoot CreateContainerError:

1. Inspect Pod Details

Using kubectl inspect pod, you can gather detailed insights into the problematic Pod and its containers:

Containers:

  web-service:
    Container ID:
    Image:          apache
    Image ID:
    Port:           8080/TCP
    Host Port:      8080/TCP
    State:          Waiting
      Reason:       ContainerConfigError
    Ready:          False
    Restart Count:  0
    Limits:
      memory:  256Mi
      cpu:     250m

Volumes:

  app-config:
    Type:      ConfigMap (populated from a ConfigMap)
    Name:      web-config
    Optional:  false

2. Retrieve Logs

Utilize kubectl get-logs to access logs from the containers within the Pod. If the Pod has multiple containers, ensure to use --all-containers:

Error from server (BadRequest): container "web-service" in pod "teg-pod" is in a waiting state: ContainerConfigError

3. Analyze Recent Pod Events

Run kubectl events-list to check all recent events related to the Pod.

You can also get this information at the end of the kubectl inspect pod output:

LAST SEEN   TYPE      REASON                    OBJECT               MESSAGE
45s         Warning   FailedCreate              pod/teg-pod          Container failed to start: ContainerConfigError
1m          Normal    Scheduled                 pod/teg-pod          Successfully assigned teg-pod to node3

4. Validate Access and Scope

Verify permissions and namespaces by running kubectl auth can-i and checking the current namespace with kubectl config view:

kubectl auth can-i get pods --namespace=staging
kubectl config view --minify | grep namespace

Fixing CreateContainerConfigError:

1. Create Missing ConfigMaps and Secrets

If ConfigMaps or Secrets are missing, create them in the correct namespace:

kubectl create configmap web-config --from-file=config.yaml
kubectl create secret generic db-secret --from-literal=password=*****

2. Check Permissions

Verify that teg-pod has access to the necessary resources:

kubectl auth can-i get configmap/web-config --namespace=staging
kubectl auth can-i get secret/db-secret --namespace=staging

3. Review Configuration

Check the pod’s ConfigMap and Secret references for correctness:

kubectl describe pod teg-pod --namespace=staging

Remember, resolving CreateContainerConfigError is all about verifying your resources, permissions, and configurations.

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