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Troubleshooting

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Troubleshooting

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When things don’t work as expected, you can investigate by taking the following actions:

Get the list of resources

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To deploy and manage the Elastic stack, ECK creates several resources in the namespace where the main resource is deployed.

For example, each Elasticsearch node and Kibana instance has a dedicated Pod. Check the status of the running Pods, and compare it with the expected instances:

kubectl get pods

NAME                                 READY     STATUS    RESTARTS   AGE
elasticsearch-sample-es-66sv6dvt7g   0/1       Pending   0          3s
elasticsearch-sample-es-9xzzhmgd4h   1/1       Running   0          27m
elasticsearch-sample-es-lgphkv9p67   0/1       Pending   0          3s
kibana-sample-kb-5468b8685d-c7mdp    0/1       Running   0          4s

Check the services:

kubectl get services

NAME                           TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
elasticsearch-sample-es-http   ClusterIP   10.19.248.93    <none>        9200/TCP   2d
kibana-sample-kb-http          ClusterIP   10.19.246.116   <none>        5601/TCP   3d

Describe failing resources

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If an Elasticsearch node does not start up, it is probably because Kubernetes cannot schedule the associated Pod.

First, check the StatefulSets to see if the current number of replicas match the desired number of replicas.

kubectl get statefulset

NAME                              DESIRED   CURRENT   AGE
elasticsearch-sample-es-default   1         1         4s

Then, check the Pod status. If a Pod fails to reach the Running status after a few seconds, something is preventing it from being scheduled or starting up:

kubectl get pods -l elasticsearch.k8s.elastic.co/statefulset-name=elasticsearch-sample-es-default

NAME                                 READY     STATUS    RESTARTS   AGE
elasticsearch-sample-es-66sv6dvt7g   0/1       Pending   0          3s
elasticsearch-sample-es-9xzzhmgd4h   1/1       Running   0          42s
elasticsearch-sample-es-lgphkv9p67   0/1       Pending   0          3s
kibana-sample-kb-5468b8685d-c7mdp    0/1       Running   0          4s

Pod elasticsearch-sample-es-lgphkv9p67 isn’t scheduled. Run this command to get more insights:

kubectl describe pod elasticsearch-sample-es-lgphkv9p67

(...)
Events:
  Type     Reason             Age               From                Message
  ----     ------             ----              ----                -------
  Warning  FailedScheduling   1m (x6 over 1m)   default-scheduler   pod has unbound immediate PersistentVolumeClaims (repeated 2 times)
  Warning  FailedScheduling   1m (x6 over 1m)   default-scheduler   pod has unbound immediate PersistentVolumeClaims
  Warning  FailedScheduling   1m (x11 over 1m)  default-scheduler   0/3 nodes are available: 1 node(s) had no available volume zone, 2 Insufficient memory.
  Normal   NotTriggerScaleUp  4s (x11 over 1m)  cluster-autoscaler  pod didn't trigger scale-up (it wouldn't fit if a new node is added)

If you see an error with unbound persistent volume claims (PVCs), it means there is not currently a persistent volume that can satisfy the claim. If you are using automatically provisioned storage (e.g. Amazon EBS provisioner), sometimes the storage provider can take a few minutes to provision a volume, so this may resolve itself in a few minutes. You can also check the status by running kubectl describe persistentvolumeclaims to see events of the PVCs.

Get Elasticsearch logs

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Each Elasticsearch node name is mapped to the corresponding Pod name. To get the logs of a particular Elasticsearch node, just fetch the Pod logs:

kubectl logs -f elasticsearch-sample-es-lgphkv9p67

(...)
{"type": "server", "timestamp": "2019-07-22T08:48:10,859+0000", "level": "INFO", "component": "o.e.c.s.ClusterApplierService", "cluster.name": "elasticsearch-sample", "node.name": "elasticsearch-sample-es-lgphkv9p67", "cluster.uuid": "cX9uCx3uQrej9hMLGPhV0g", "node.id": "R_OcheBlRGeqme1IZzE4_Q",  "message": "added {{elasticsearch-sample-es-kqz4jmvj9p}{UGy5IX0UQcaKlztAoh4sLA}{3o_EUuZvRKW7R1C8b1zzzg}{10.16.2.232}{10.16.2.232:9300}{ml.machine_memory=27395555328, ml.max_open_jobs=20, xpack.installed=true},{elasticsearch-sample-es-stzz78k64p}{Sh_AzQcxRzeuIoOQWgru1w}{cwPoTFNnRAWtqsXWQtWbGA}{10.16.2.233}{10.16.2.233:9300}{ml.machine_memory=27395555328, ml.max_open_jobs=20, xpack.installed=true},}, term: 1, version: 164, reason: ApplyCommitRequest{term=1, version=164, sourceNode={elasticsearch-sample-es-9xzzhmgd4h}{tAi_bCPcSaO1OkLap4wmhQ}{E6VcWWWtSB2oo-2zmj9DMQ}{10.16.1.150}{10.16.1.150:9300}{ml.machine_memory=27395555328, ml.max_open_jobs=20, xpack.installed=true}}"  }
{"type": "server", "timestamp": "2019-07-22T08:48:22,224+0000", "level": "INFO", "component": "o.e.c.s.ClusterApplierService", "cluster.name": "elasticsearch-sample", "node.name": "elasticsearch-sample-es-lgphkv9p67", "cluster.uuid": "cX9uCx3uQrej9hMLGPhV0g", "node.id": "R_OcheBlRGeqme1IZzE4_Q",  "message": "added {{elasticsearch-sample-es-fn9wvxw6sh}{_tbAciHTStaAlUO6GtD9LA}{1g7_qsXwR0qjjfom05VwMA}{10.16.1.154}{10.16.1.154:9300}{ml.machine_memory=27395555328, ml.max_open_jobs=20, xpack.installed=true},}, term: 1, version: 169, reason: ApplyCommitRequest{term=1, version=169, sourceNode={elasticsearch-sample-es-9xzzhmgd4h}{tAi_bCPcSaO1OkLap4wmhQ}{E6VcWWWtSB2oo-2zmj9DMQ}{10.16.1.150}{10.16.1.150:9300}{ml.machine_memory=27395555328, ml.max_open_jobs=20, xpack.installed=true}}"  }

You can run the same command for Kibana and APM Server.

Get init container logs

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An Elasticsearch Pod runs a few init containers to prepare the file system of the main Elasticsearch container. In some scenarios, the Pod may fail to run (Status: Error or Status: CrashloopBackOff) because one of the init containers is failing to run. Look at the init container statuses and logs to get more details.

Get ECK logs

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Since the ECK operator is just a standard Pod running in the Kubernetes cluster, you can fetch its logs as you would for any other Pod:

kubectl -n elastic-system logs -f statefulset.apps/elastic-operator

The operator constantly attempts to reconcile Kubernetes resources to match the desired state. Logs with INFO level provide some insights about what is going on. Logs with ERROR level indicate something is not going as expected.

Due to optimistic locking, you can get errors reporting a conflict while updating a resource. You can ignore them, as the update goes through at the next reconciliation attempt, which will happen almost immediately.

Enable ECK debug logs

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To enable DEBUG level logs on the operator, restart it with the flag --enable-debug-logs=true. For example:

kubectl edit statefulset.apps -n elastic-system elastic-operator

and change the following lines from:

  spec:
    containers:
    - args:
      - manager
      - --operator-roles
      - all
      - --enable-debug-logs=false

  spec:
    containers:
    - args:
      - manager
      - --operator-roles
      - all
      - --enable-debug-logs=true

Pause ECK controllers

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When debugging Elasticsearch, you night need to "pause" the operator reconciliations, so that no resource gets modified or created in the meantime. To do this, set the annotation common.k8s.elastic.co/pause to true to any resource controlled by the operator:

Elasticsearch
Kibana
ApmServer

metadata:
  annotations:
    common.k8s.elastic.co/pause: "true"

Or in one line:

kubectl annotate elasticsearch quickstart --overwrite common.k8s.elastic.co/pause=true

Get Kubernetes events

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ECK will emit events when:

important operations are performed (example: a new Elasticsearch Pod was created)
something is wrong, and the user must be notified

Fetch Kubernetes events:

kubectl get events

(...)
28s       25m       58        elasticsearch-sample-es-p45nrjch29.15b3ae4cc4f7c00d   Pod                             Warning   FailedScheduling    default-scheduler                                         0/3 nodes are available: 1 node(s) had no available volume zone, 2 Insufficient memory.
28s       25m       52        elasticsearch-sample-es-wxpnzfhqbt.15b3ae4d86bc269f   Pod                             Warning   FailedScheduling    default-scheduler                                         0/3 nodes are available: 1 node(s) had no available volume zone, 2 Insufficient memory.

You can filter the events to show only those that are relevant to a particular Elasticsearch cluster:

kubectl get event --namespace default --field-selector involvedObject.name=elasticsearch-sample

LAST SEEN   FIRST SEEN   COUNT     NAME                                    KIND            SUBOBJECT   TYPE      REASON    SOURCE                     MESSAGE
30m         30m          1         elasticsearch-sample.15b3ae303baa93c0   Elasticsearch               Normal    Created   elasticsearch-controller   Created pod elasticsearch-sample-es-4q7q2k8cl7
30m         30m          1         elasticsearch-sample.15b3ae303bab4f40   Elasticsearch               Normal    Created   elasticsearch-controller   Created pod elasticsearch-sample-es-jg7dsfkcp8
30m         30m          1         elasticsearch-sample.15b3ae303babdfc8   Elasticsearch               Normal    Created   elasticsearch-controller   Created pod elasticsearch-sample-es-xrxsp54jd5

You can set filters for Kibana and APM Server too. Note that the default TTL for events in Kubernetes is 1h, so unless your cluster settings have been modified you will not see events older than 1h.

Exec into containers

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To troubleshoot a filesystem, configuration or a network issue, you can run Shell commands directly in the Elasticsearch container. You can do this with kubectl:

kubectl exec -ti elasticsearch-sample-es-p45nrjch29 bash

This can also be done for Kibana and APM Server.

Webhook troubleshooting

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On startup, the operator deploys an admission webhook that points to the operator’s service. If this is inaccessible, you may see errors in your Kubernetes API server logs indicating that it cannot reach the service. A common cause may be that the operator pods are failing to start for some reason, or that the control plane is isolated from the operator pod by some mechanism (for instance via network policies or running the control plane externally as in issue #869 and issue #1369).

Ask for help

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ECK Discuss forums to ask any question
Github issues for bugs and feature requests

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