Step 10: Check cluster readiness

Check hybrid cluster readiness

Before applying your configuration and installing the hybrid helm charts, you should check that your Kubernetes cluster is ready for Apigee hybrid installation.

To check the readiness of your cluster, you will create a YAML file with a Kubernetes Job definition and apply that file with kubectl commands to check the cluster. You then check the status of the Kubernetes test job with a kubectl get jobs command.

Verify that kubectl is set to the correct context using the following command. The current context should be set to the cluster to which you are deploying Apigee hybrid.
```
kubectl config current-context
```
The result should include the name of the cluster you are deploying Apigee hybrid in. For example, on GKE, the context name is usually in the form gke_project-id_cluster-location_cluster-name, as in:
```
gke_my-project_us-central1_my-cluster
```
If the name cluster name in the context does not match, the following command will get the gcloud credentials of the cluster and set the kubectl context:
Regional clusters
```
gcloud container clusters get-credentials $CLUSTER_NAME \
--region $CLUSTER_LOCATION \
--project $PROJECT_ID
```
Zonal clusters
```
gcloud container clusters get-credentials $CLUSTER_NAME \
--zone $CLUSTER_LOCATION \
--project $PROJECT_ID
```
In your helm-charts directory, create a cluster-check directory:
```
mkdir $APIGEE_HELM_CHARTS_HOME/cluster-check
```

In the $APIGEE_HELM_CHARTS_HOME/cluster-check directory, create a file named apigee-k8s-cluster-ready-check.yaml with the following contents:

apiVersion: v1
kind: ServiceAccount
metadata:
  name: apigee-k8s-cluster-ready-check
---
apiVersion: batch/v1
kind: Job
metadata:
  name: apigee-k8s-cluster-ready-check
spec:
  template:
    spec:
      hostNetwork: true
      serviceAccountName: apigee-k8s-cluster-ready-check
      containers:
        - name: manager
          image: gcr.io/apigee-release/hybrid/apigee-operators:1.14.0
          command:
            - /manager
          args:
          - --k8s-cluster-ready-check
          env:
          - name: POD_IP
            valueFrom:
              fieldRef:
                fieldPath: status.podIP
          securityContext:
            runAsGroup: 998
            runAsNonRoot: true
            runAsUser: 999
      restartPolicy: Never
  backoffLimit: 1

Apply the apigee-k8s-cluster-ready-check.yaml with the following kubectl command. This will run the test:

kubectl apply -f $APIGEE_HELM_CHARTS_HOME/cluster-check/apigee-k8s-cluster-ready-check.yaml

The output should show that the service account and job were created. For example:

kubectl apply -f $APIGEE_HELM_CHARTS_HOME/cluster-check/apigee-k8s-cluster-ready-check.yaml
serviceaccount/apigee-k8s-cluster-ready-check created
job.batch/apigee-k8s-cluster-ready-check created

Check the status of the Kubernetes job with the following command:
```
kubectl get jobs apigee-k8s-cluster-ready-check
```
If your cluster is ready, the output should look something like:
```
NAME                            COMPLETIONS   DURATION   AGE
apigee-k8s-cluster-ready-check  1/1           8s         1h23m
```
If the test failed and your cluster is not ready, the output will look something like:
```
NAME                            COMPLETIONS   DURATION   AGE
apigee-k8s-cluster-ready-check  0/1           44s         44s
```
Look for the number of completions:
- 1/1 Success, your cluster is ready for Apigee hybrid installation.
- 0/1 The test failed. The cluster is not ready. Proceed to the following steps to troubleshoot the cluster.
If the test did not succeed, check the logs with the following commands.
1. Get the name of the pod for the cluster pre-check job:
```
kubectl get pods | grep apigee-k8s-cluster-ready-check
```
2. Get the Kubernetes logs for the pod:
```
kubectl logs pod_name
```
  Where pod_name is the name of the apigee-k8s-cluster-ready-check pod.

Clean up before proceeding to the next step. Delete the Kubernetes job with the following command:

kubectl delete -f $APIGEE_HELM_CHARTS_HOME/cluster-check/apigee-k8s-cluster-ready-check.yaml

The output should show that the service account and job were deleted. For example:

kubectl delete -f $APIGEE_HELM_CHARTS_HOME/cluster-check/apigee-k8s-cluster-ready-check.yaml
serviceaccount "apigee-k8s-cluster-ready-check" deleted
job.batch "apigee-k8s-cluster-ready-check" deleted

You have now made sure your Apigee hybrid cluster is ready. Next, let's install the charts to apply your configuration to the hybrid runtime.

Troubleshooting

Cassandra DNS check: If you find error logs similar to DNS resolution was successful but IP doesn't match POD IP, could not resolve hostname or error determining hostname it means your cluster DNS is not configured correctly for a multi-region setup. You can ignore this error if you do not intend to set up multi-region.
Control Plane connectivity check: If you find error logs similar to error creating TCP connection with host then you need to resolve the connectivity from cluster to apigee.googleapis.com and re-run the job.

Next step

1 2 3 4 5 6 7 8 9 10 (NEXT) Step 11: Set up Workload Identity

Step 10: Check cluster readiness

Check hybrid cluster readiness

Regional clusters

Zonal clusters

Troubleshooting

Next step