Fix Kubernetes CreateContainerConfigError (2026)

What Is CreateContainerConfigError?

CreateContainerConfigError means Kubernetes accepted your Pod spec but cannot create the container because something in the configuration is invalid or missing. The Pod stays in Pending or shows CreateContainerConfigError in the STATUS column:

kubectl get pods

NAME                     READY   STATUS                       RESTARTS   AGE
my-app-7b8f9d4c6-x2k4j  0/1     CreateContainerConfigError   0          2m

Unlike CrashLoopBackOff (container starts then dies) or ImagePullBackOff (image not found), CreateContainerConfigError means the container never starts because its configuration references something that does not exist or is malformed.

Step 1: Get the Error Details

kubectl describe pod my-app-7b8f9d4c6-x2k4j

Scroll to the Events section at the bottom. The error message tells you exactly what is wrong. Here are the most common causes and fixes.

Cause 1: Missing ConfigMap

Error message:

Warning  Failed  configmap "app-config" not found

The Pod references a ConfigMap that does not exist in the namespace.

Diagnose:

kubectl get configmap app-config -n <namespace>

Fix — Create the missing ConfigMap:

kubectl create configmap app-config \
  --from-literal=DATABASE_HOST=postgres \
  --from-literal=DATABASE_PORT=5432 \
  -n <namespace>

Or from a file:

kubectl create configmap app-config \
  --from-file=config.yaml=./config.yaml \
  -n <namespace>

Prevention: Use optional: true in your Pod spec if the ConfigMap is not critical:

envFrom:
  - configMapRef:
      name: app-config
      optional: true

Cause 2: Missing Secret

Error message:

Warning  Failed  secret "db-credentials" not found

Diagnose:

kubectl get secret db-credentials -n <namespace>

Fix:

kubectl create secret generic db-credentials \
  --from-literal=username=admin \
  --from-literal=password=s3cur3p4ss \
  -n <namespace>

Common gotcha: Secrets are namespace-scoped. If you created the Secret in default but the Pod runs in production, it will not find it.

# Check which namespace the Pod is in
kubectl get pod my-app-7b8f9d4c6-x2k4j -o jsonpath='{.metadata.namespace}'

Cause 3: Missing Secret Key

Error message:

Warning  Failed  couldn't find key "password" in Secret default/db-credentials

The Secret exists but is missing the specific key your Pod references.

Diagnose:

kubectl get secret db-credentials -o jsonpath='{.data}' | jq

Fix — Add the missing key:

kubectl patch secret db-credentials -p '{"data":{"password":"czNjdXIzcDRzcw=="}}'

Note: Secret values must be base64-encoded:

echo -n "s3cur3p4ss" | base64

Cause 4: Volume Mount Referencing Missing ConfigMap or Secret

Error message:

Warning  Failed  configmap "nginx-config" not found

When a volume references a ConfigMap or Secret that does not exist:

volumes:
  - name: config-volume
    configMap:
      name: nginx-config  # This ConfigMap must exist

Fix: Create the ConfigMap or mark it optional:

volumes:
  - name: config-volume
    configMap:
      name: nginx-config
      optional: true

Cause 5: Invalid Security Context

Error message:

Warning  Failed  Error: container has runAsNonRoot and image will run as root

The Pod security context requires non-root, but the container image runs as root.

Fix — Option A: Set runAsUser in the Pod spec:

securityContext:
  runAsUser: 1000
  runAsNonRoot: true

Fix — Option B: Use an image that runs as non-root:

FROM nginx:alpine
RUN adduser -D -u 1000 appuser
USER appuser

Fix — Option C: Remove the restriction (not recommended for production):

securityContext:
  runAsNonRoot: false

Cause 6: Invalid Resource Requests

Error message:

Warning  Failed  Error: invalid resource quantity

Malformed resource requests or limits:

# WRONG - missing unit
resources:
  requests:
    memory: 256  # Should be "256Mi"
    cpu: 100     # Should be "100m"

Fix:

resources:
  requests:
    memory: "256Mi"
    cpu: "100m"
  limits:
    memory: "512Mi"
    cpu: "500m"

Cause 7: ServiceAccount Token Mount Failure

Error message:

Warning  Failed  serviceaccount "my-sa" not found

Diagnose:

kubectl get serviceaccount my-sa -n <namespace>

Fix:

kubectl create serviceaccount my-sa -n <namespace>

Cause 8: Projected Volume Configuration Error

Error message:

Warning  Failed  projected volume source is invalid

Projected volumes combine multiple sources. Any misconfigured source blocks the container:

volumes:
  - name: combined
    projected:
      sources:
        - configMap:
            name: app-config    # Must exist
        - secret:
            name: app-secret    # Must exist
        - serviceAccountToken:
            expirationSeconds: 3600

Fix: Verify each source exists individually.

Quick Diagnostic Script

Run this to check all common causes at once:

#!/bin/bash
POD=$1
NS=${2:-default}

echo "=== Pod Events ==="
kubectl describe pod $POD -n $NS | grep -A 20 "Events:"

echo -e "\n=== ConfigMap References ==="
kubectl get pod $POD -n $NS -o json | \
  jq -r '.. | .configMapRef?.name // .configMap?.name // empty' | \
  sort -u | while read cm; do
    kubectl get configmap $cm -n $NS &>/dev/null && \
      echo "  ✅ $cm exists" || echo "  ❌ $cm MISSING"
  done

echo -e "\n=== Secret References ==="
kubectl get pod $POD -n $NS -o json | \
  jq -r '.. | .secretRef?.name // .secretKeyRef?.secretName // .secret?.secretName // empty' | \
  sort -u | while read s; do
    kubectl get secret $s -n $NS &>/dev/null && \
      echo "  ✅ $s exists" || echo "  ❌ $s MISSING"
  done

echo -e "\n=== ServiceAccount ==="
SA=$(kubectl get pod $POD -n $NS -o jsonpath='{.spec.serviceAccountName}')
kubectl get serviceaccount $SA -n $NS &>/dev/null && \
  echo "  ✅ $SA exists" || echo "  ❌ $SA MISSING"

Save as debug-createcontainerconfigerror.sh and run:

chmod +x debug-createcontainerconfigerror.sh
./debug-createcontainerconfigerror.sh my-app-7b8f9d4c6-x2k4j default

Prevention Checklist

Common Mistakes

1. Wrong namespace — most common cause. ConfigMap in default, Pod in production
2. Typo in ConfigMap/Secret name — Kubernetes is case-sensitive
3. Forgot to apply ConfigMap — your Helm chart or Kustomize overlay did not include it
4. Secret key mismatch — the key in secretKeyRef.key must exactly match a key in the Secret data
5. Base64 encoding issues — Secrets with newlines or special characters in base64

When It Is Not CreateContainerConfigError

If you see similar symptoms but different status:

• ImagePullBackOff — image does not exist or registry auth is wrong → Fix ImagePullBackOff
• CrashLoopBackOff — container starts but exits → Fix CrashLoopBackOff
• Pending — no node has enough resources → Fix Pod Pending
• OOMKilled — out of memory → Fix OOMKilled

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