These tips can help you avoid issues related to your Vertica on Kubernetes deployment and troubleshoot any problems that occur.
Download the kubectl command line tool to debug your Kubernetes resources.
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Troubleshooting your Kubernetes cluster
These tips can help you avoid issues related to your Vertica on Kubernetes deployment and troubleshoot any problems that occur.
1 - General cluster and database
Inspect objects to diagnose issues
When you deploy a custom resource (CR), you might encounter a variety of issues. To pinpoint an issue, use the following commands to inspect the objects that the CR creates:
kubectl get returns basic information about deployed objects:
$ kubectl get pods -n namespace
$ kubectl get statefulset -n namespace
$ kubectl get pvc -n namespace
$ kubectl get event
kubectl describe returns detailed information about deployed objects:
$ kubectl describe pod pod-name -n namespace
$ kubectl describe statefulset name -n namespace
$ kubectl describe custom-resource-name -n namespace
Verify updates to a custom resource
Because the operator takes time to perform tasks, updates to the custom resource are not effective immediately. Use the kubectl command line tool to verify that changes are applied.
You can use the kubectl wait command to wait for a specified condition. For example, the operator uses the UpgradeInProgress condition to provide an upgrade status. After you begin the image version upgrade, wait until the operator acknowledges the upgrade and sets this condition to True:
$ kubectl wait --for=condition=UpgradeInProgress=True vdb/cluster-name –-timeout=180s
After the upgrade begins, you can wait until the operator leaves upgrade mode and sets this condition to False:
$ kubectl wait --for=condition=UpgradeInProgress=False vdb/cluster-name –-timeout=800s
For more information about kubectl wait, see the kubectl reference documentation.
Pods are running but the database is not ready
When you check the pods in your cluster, the pods are running but the database is not ready:
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
vertica-crd-sc1-0 0/1 Running 0 12m
vertica-crd-sc1-1 0/1 Running 1 12m
vertica-crd-sc1-2 0/1 Running 0 12m
verticadb-operator-controller-manager-5d9cdc9b8-kw9nv 2/2 Running 0 24m
To find the root cause of the issue, use kubectl logs to check the operator manager. The following example shows that the communal storage bucket does not exist:
$ kubectl logs -l app.kubernetes.io/name=verticadb-operator -c manager -f
2021-08-04T20:03:00.289Z INFO controllers.VerticaDB ExecInPod entry {"verticadb": "default/vertica-crd", "pod": {"namespace": "default", "name": "vertica-crd-sc1-0"}, "command": "bash -c ls -l /opt/vertica/config/admintools.conf && grep '^node\\|^v_\\|^host' /opt/vertica/config/admintools.conf "}
2021-08-04T20:03:00.369Z INFO controllers.VerticaDB ExecInPod stream {"verticadb": "default/vertica-crd", "pod": {"namespace": "default", "name": "vertica-crd-sc1-0"}, "err": null, "stdout": "-rw-rw-r-- 1 dbadmin verticadba 1243 Aug 4 20:00 /opt/vertica/config/admintools.conf\nhosts = 10.244.1.5,10.244.2.4,10.244.4.6\nnode0001 = 10.244.1.5,/data,/data\nnode0002 = 10.244.2.4,/data,/data\nnode0003 = 10.244.4.6,/data,/data\n", "stderr": ""}
2021-08-04T20:03:00.369Z INFO controllers.VerticaDB ExecInPod entry {"verticadb": "default/vertica-crd", "pod": {"namespace": "default", "name": "vertica-crd-sc1-0"}, "command": "/opt/vertica/bin/admintools -t create_db --skip-fs-checks --hosts=10.244.1.5,10.244.2.4,10.244.4.6 --communal-storage-location=s3://newbucket/db/26100df1-93e5-4e64-b665-533e14abb67c --communal-storage-params=/home/dbadmin/auth_parms.conf --sql=/home/dbadmin/post-db-create.sql --shard-count=12 --depot-path=/depot --database verticadb --force-cleanup-on-failure --noprompt --password ******* "}
2021-08-04T20:03:00.369Z DEBUG controller-runtime.manager.events Normal {"object": {"kind":"VerticaDB","namespace":"default","name":"vertica-crd","uid":"26100df1-93e5-4e64-b665-533e14abb67c","apiVersion":"vertica.com/v1","resourceVersion":"11591"}, "reason": "CreateDBStart", "message": "Calling 'admintools -t create_db'"}
2021-08-04T20:03:17.051Z INFO controllers.VerticaDB ExecInPod stream {"verticadb": "default/vertica-crd", "pod": {"namespace": "default", "name": "vertica-crd-sc1-0"}, "err": "command terminated with exit code 1", "stdout": "Default depot size in use\nDistributing changes to cluster.\n\tCreating database verticadb\nBootstrap on host 10.244.1.5 return code 1 stdout '' stderr 'Logged exception in writeBufferToFile: RecvFiles failed in closing file [s3://newbucket/db/26100df1-93e5-4e64-b665-533e14abb67c/verticadb_rw_access_test.txt]: The specified bucket does not exist. Writing test data to file s3://newbucket/db/26100df1-93e5-4e64-b665-533e14abb67c/verticadb_rw_access_test.txt failed.\\nTesting rw access to communal location s3://newbucket/db/26100df1-93e5-4e64-b665-533e14abb67c/ failed\\n'\n\nError: Bootstrap on host 10.244.1.5 return code 1 stdout '' stderr 'Logged exception in writeBufferToFile: RecvFiles failed in closing file [s3://newbucket/db/26100df1-93e5-4e64-b665-533e14abb67c/verticadb_rw_access_test.txt]: The specified bucket does not exist. Writing test data to file s3://newbucket/db/26100df1-93e5-4e64-b665-533e14abb67c/verticadb_rw_access_test.txt failed.\\nTesting rw access to communal location s3://newbucket/db/26100df1-93e5-4e64-b665-533e14abb67c/ failed\\n'\n\n", "stderr": ""}
2021-08-04T20:03:17.051Z INFO controllers.VerticaDB aborting reconcile of VerticaDB {"verticadb": "default/vertica-crd", "result": {"Requeue":true,"RequeueAfter":0}, "err": null}
2021-08-04T20:03:17.051Z DEBUG controller-runtime.manager.events Warning {"object": {"kind":"VerticaDB","namespace":"default","name":"vertica-crd","uid":"26100df1-93e5-4e64-b665-533e14abb67c","apiVersion":"vertica.com/v1","resourceVersion":"11591"}, "reason": "S3BucketDoesNotExist", "message": "The bucket in the S3 path 's3://newbucket/db/26100df1-93e5-4e64-b665-533e14abb67c' does not exist"}
Create an S3 bucket for the cluster:
$ S3_BUCKET=newbucket
$ S3_CLUSTER_IP=$(kubectl get svc | grep minio | head -1 | awk '{print $3}')
$ export AWS_ACCESS_KEY_ID=minio
$ export AWS_SECRET_ACCESS_KEY=minio123
$ aws s3 mb s3://$S3_BUCKET --endpoint-url http://$S3_CLUSTER_IP
make_bucket: newbucket
Use kubectl get pods to verify that the cluster uses the new S3 bucket and the database is ready:
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
minio-ss-0-0 1/1 Running 0 18m
minio-ss-0-1 1/1 Running 0 18m
minio-ss-0-2 1/1 Running 0 18m
minio-ss-0-3 1/1 Running 0 18m
vertica-crd-sc1-0 1/1 Running 0 20m
vertica-crd-sc1-1 1/1 Running 0 20m
vertica-crd-sc1-2 1/1 Running 0 20m
verticadb-operator-controller-manager-5d9cdc9b8-kw9nv 2/2 Running 0 63m
Database is not available
After you create a custom resource instance, the database is not available. The kubectl get custom-resource command does not display information:
$ kubectl get vdb
NAME AGE SUBCLUSTERS INSTALLED DBADDED UP
vertica-crd 4s
Use kubectl describe custom-resource to check the events for the pods to identify any issues:
$ kubectl describe vdb
Name: vertica-crd
Namespace: default
Labels: <none>
Annotations: <none>
API Version: vertica.com/v1
Kind: VerticaDB
Metadata:
...
Superuser Password Secret: su-passwd
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Warning SuperuserPasswordSecretNotFound 5s (x12 over 15s) verticadb-operator Secret for superuser password 'su-passwd' was not found
In this circumstance, the custom resource uses a Secret named su-passwd to store the Superuser Password Secret, but there is no such Secret available. Create a Secret named su-passwd to store the Secret:
$ kubectl create secret generic su-passwd --from-literal=password=sup3rs3cr3t
secret/su-passwd created
Note
For detailed steps about creating the Secret manifest and applying it to a namespace, see the Kubernetes documentation.
For details about Vertica and secret credentials, see Secrets management.
Use kubectl get custom-resource to verify the issue is resolved:
$ kubectl get vdb
NAME AGE SUBCLUSTERS INSTALLED DBADDED UP
vertica-crd 89s 1 0 0 0
Image pull failure
You receive an ImagePullBackOff error when you deploy a Vertica cluster with Helm charts, but you do not pre-pull the Vertica image from the local registry server:
$ kubectl describe pod pod-name-0
...
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
...
Warning Failed 2m32s kubelet Failed to pull image "k8s-rhel7-01:5000/vertica-k8s:default-1": rpc error: code = Unknown desc = context canceled
Warning Failed 2m32s kubelet Error: ErrImagePull
Normal BackOff 2m32s kubelet Back-off pulling image "k8s-rhel7-01:5000/vertica-k8s:default-1"
Warning Failed 2m32s kubelet Error: ImagePullBackOff
Normal Pulling 2m18s (x2 over 4m22s) kubelet Pulling image "k8s-rhel7-01:5000/vertica-k8s:default-1"
This occurs because the Vertica image size is too big to pull from the registry while deploying the Vertica cluster. Execute the following command on a Kubernetes host:
$ docker image list | grep vertica-k8s
k8s-rhel7-01:5000/vertica-k8s default-1 2d6f5d3d90d6 9 days ago 1.55GB
To solve this issue, complete one of the following:
-
Pull the Vertica images on each node before creating the Vertica StatefulSet:
$ NODES=`kubectl get nodes | grep -v NAME | awk '{print $1}'` $ for node in $NODES; do ssh $node docker pull $DOCKER_REGISTRY:5000/vertica-k8s:$K8S_TAG; done -
Use the reduced-size vertica/vertica-k8s:latest image for the Vertica server.
Pending pods due to insufficient CPU
If your host nodes do not have enough resources to fulfill the resource request from a pod, the pod stays in pending status.
Note
As a best practice, do not request the maximum amount of resources available on a host node to leave resources for other processes on the host node.In the following example, the pod requests 40 CPUs on the host node, and the pod stays in Pending:
$ kubectl describe pod cluster-vertica-defaultsubcluster-0
...
Status: Pending
...
Containers:
server:
Image: docker.io/library/vertica-k8s:default-1
Ports: 5433/TCP, 5434/TCP, 22/TCP
Host Ports: 0/TCP, 0/TCP, 0/TCP
Command:
/opt/vertica/bin/docker-entrypoint.sh
restart-vertica-node
Limits:
memory: 200Gi
Requests:
cpu: 40
memory: 200Gi
...
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Warning FailedScheduling 3h20m default-scheduler 0/5 nodes are available: 5 Insufficient cpu.
To confirm the resources available on the host node. The following command confirms that the host node has only 40 allocatable CPUs:
$ kubectl describe node host-node-1
...
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
MemoryPressure False Sat, 20 Mar 2021 22:39:10 -0400 Sat, 20 Mar 2021 13:07:02 -0400 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Sat, 20 Mar 2021 22:39:10 -0400 Sat, 20 Mar 2021 13:07:02 -0400 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Sat, 20 Mar 2021 22:39:10 -0400 Sat, 20 Mar 2021 13:07:02 -0400 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Sat, 20 Mar 2021 22:39:10 -0400 Sat, 20 Mar 2021 13:07:12 -0400 KubeletReady kubelet is posting ready status
Addresses:
InternalIP: 172.19.0.5
Hostname: eng-g9-191
Capacity:
cpu: 40
ephemeral-storage: 285509064Ki
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 263839236Ki
pods: 110
Allocatable:
cpu: 40
ephemeral-storage: 285509064Ki
hugepages-1Gi: 0
hugepages-2Mi: 0
memory: 263839236Ki
pods: 110
...
Non-terminated Pods: (3 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits AGE
--------- ---- ------------ ---------- --------------- ------------- ---
default cluster-vertica-defaultsubcluster-0 38 (95%) 0 (0%) 200Gi (79%) 200Gi (79%) 51m
kube-system kube-flannel-ds-8brv9 100m (0%) 100m (0%) 50Mi (0%) 50Mi (0%) 9h
kube-system kube-proxy-lgjhp 0 (0%) 0 (0%) 0 (0%) 0 (0%) 9h
...
To correct this issue, reduce the resource.requests in the subcluster to values lower than the maximum allocatable CPUs. The following example uses a YAML-formatted file named patch.yaml to lower the resource requests for the pod:
$ cat patch.yaml
spec:
subclusters:
- name: defaultsubcluster
resources:
requests:
memory: 238Gi
cpu: "38"
limits:
memory: 238Gi
$ kubectl patch vdb cluster-vertica –-type=merge --patch “$(cat patch.yaml)”
verticadb.vertica.com/cluster-vertica patched
Pending pod after node removed
When you remove a host node from your Kubernetes cluster, a Vertica pod might stay in pending status if the pod uses a PersistentVolume (PV) that has a node affinity rule that prevents the pod from running on another node.
To resolve this issue, you must verify that the pods are pending because of an affinity rule, and then use the vdb-gen tool to revive the entire cluster.
First, determine if the pod is pending because of a node affinity rule. This requires details about the pending pod, the PersistentVolumeClaim (PVC) associated with the pod, and the PersistentVolume (PV) associated with the PVC:
-
Use
kubectl describeto return details about the pending pod:$ kubectl describe pod pod-name ... Events: Type Reason Age From Message ---- ------ ---- ---- ------- Warning FailedScheduling 28s (x2 over 48s) default-scheduler 0/2 nodes are available: 1 node(s) had untolerated taint {node.kubernetes.io/unschedulable: }, 1 node(s) had volume node affinity conflict, 1 node(s) were unschedulable. preemption: 0/2 nodes are available: 2 Preemption is not helpful for scheduling.The
Messagecolumn verifies that the pod was not scheduled due avolume node affinity conflict. -
Get the name of the PVC associated with the pod:
$ kubectl get pod -o jsonpath='{.spec.volumes[0].persistentVolumeClaim.claimName}{"\n"}' pod-name local-data-pod-name -
Use the PVC to get the PV. PVs are associated with nodes:
$ kubectl get pvc -o jsonpath='{.spec.volumeName}{"\n"}' local-data-pod-name pvc-1926ae96-574d-4433-99b4-ec9ab0e5e497 -
Use the PV to get the name of the node that has the affinity rule:
$ kubectl get pv -o jsonpath='{.spec.nodeAffinity.required.nodeSelectorTerms[0].matchExpressions[0].values[0]}{"\n"}' pvc-1926ae96-574d-4433-99b4-ec9ab0e5e497 ip-10-20-30-40.ec2.internal -
Verify that the node with the affinity rule is the node that was removed from the Kubernetes cluster.
Next, you must revive the entire cluster to get all pods running again. When you revive the cluster, you create new PVCs that restore the association between each pod and a PV to satisfy the node affinity rule.
While you have nodes running in the cluster, you can use the vdb-gen tool to generate a manifest and revive the database:
-
Download the
vdb-gentool from the vertica-kubernetes GitHub repository:$ wget https://github.com/vertica/vertica-kubernetes/releases/latest/download/vdb-gen -
Copy the tool into a pod that has a running Vertica process:
$ kubectl cp vdb-gen pod-name:/tmp/vdb-gen -
The
vdb-gentool requires the database name, so retrieve it with the following command:$ kubectl get vdb -o jsonpath='{.spec.dbName}{"\n"}' v database-name -
Run the
vdb-gentool with the database name. The following command runs the tool and pipes the output to a file namedrevive.yaml:$ kubectl exec -i pod-name -- bash -c "chmod +x /tmp/vdb-gen && /tmp/vdb-gen --ignore-cluster-lease --name v localhost database-name | tee /tmp/revive.yaml" -
Copy
revive.yamlto your local machine so that you can use it after you remove the cluster:$ kubectl cp pod-name:/tmp/revive.yaml revive.yaml -
Save the current VerticaDB Custom Resource (CR). For example, the following command saves a CR named
vertdbto a file namedorig.yaml:$ kubectl get vdb vertdb -o yaml > orig.yaml -
Update
revive.yamlwith parts oforig.yamlthatvdb-gendid not capture. For example, custom resource limits. -
Delete the existing Vertica cluster:
$ kubectl delete vdb vertdb verticadb.vertica.com "vertdb" deleted -
Confirm that all PVCs that are associated with the deleted cluster were removed:
-
Retrieve the PVC names. A PVC name uses the
dbname-subcluster-podindexformat:$ kubectl get pvc NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE local-data-vertdb-sc-0 Bound pvc-e9834c18-bf60-4a4b-a686-ba8f7b601230 1Gi RWO local-path 34m local-data-vertdb-sc-1 Bound pvc-1926ae96-574d-4433-99b4-ec9ab0e5e497 1Gi RWO local-path 34m local-data-vertdb-sc-2 Bound pvc-4541f7c9-3afc-47f0-8d04-67fac370ee88 1Gi RWO local-path 34m -
Delete the PVCs:
$ kubectl delete pvc local-data-vertdb-sc-0 local-data-vertdb-sc-1 local-data-vertdb-sc-2 persistentvolumeclaim "local-data-vertdb-sc-0" deleted persistentvolumeclaim "local-data-vertdb-sc-1" deleted persistentvolumeclaim "local-data-vertdb-sc-2" deleted
-
-
Revive the database with
revive.yaml:$ kubectl apply -f revive.yaml verticadb.vertica.com/vertdb created
After the revive completes, all Vertica pods are running, and PVCs are recreated on new nodes. Wait for the operator to start the database.
Deploying to Istio
Vertica does not officially support Istio because the Istio sidecar port requirement conflicts with the port that Vertica requires for internal node communication. However, you can deploy Vertica on Kubernetes to Istio with changes to the Istio InboundInterceptionMode setting. Vertica provides access to this setting with annotations on the VerticaDB CR.
REDIRECT mode
REDIRECT mode is the default InboundInterceptionMode setting, and it requires that you disable network address translation (NAT) on port 5434, the port that the pods use for internal communication. Disable NAT on this port with the excludeInboundPorts annotation:
apiVersion: vertica.com/v1
kind: VerticaDB
metadata:
name: vdb
spec:
annotations:
traffic.sidecar.istio.io/excludeInboundPorts: "5434"
2 - Helm charts
Custom certificate helm install error
If you use custom certificates when you install the operator with the Helm chart, the helm install or kubectl apply command might return an error similar to the following:
$ kubectl apply -f ../operatorcrd.yaml
Error from server (InternalError): error when creating "../operatorcrd.yaml": Internal error occurred: failed calling webhook "mverticadb.kb.io": Post "https://verticadb-operator-webhook-service.namespace.svc:443/mutate-vertica-com-v1-verticadb?timeout=10s": x509: certificate is valid for ip-10-0-21-169.ec2.internal, test-bastion, not verticadb-operator-webhook-service.default.svc
You receive this error when the TLS key's Domain Name System (DNS) or Subject Alternate Name (SAN) is incorrect. To correct this error, define the DNS and SAN in a configuration file in the following format:
commonName = verticadb-operator-webhook-service.namespace.svc
...
[alt_names]
DNS.1 = verticadb-operator-webhook-service.namespace.svc
DNS.2 = verticadb-operator-webhook-service.namespace.svc.cluster.local
For additional details, see Installing the VerticaDB operator.
3 - Metrics gathering
Adding and testing the vlogger sidecar
Vertica provides the vlogger image that sends logs from vertica.log to standard output on the host node for log aggregation.
To add the sidecar to the CR, add an element to the spec.sidecars definition:
spec:
...
sidecars:
- name: vlogger
image: vertica/vertica-logger:1.0.0
To test the sidecar, run the following command and verify that it returns logs:
$ kubectl logs pod-name -c vlogger
2021-12-08 14:39:08.538 DistCall Dispatch:0x7f3599ffd700-c000000000997e [Txn
2021-12-08 14:40:48.923 INFO New log
2021-12-08 14:40:48.923 Main Thread:0x7fbbe2cf6280 [Init] <INFO> Log /data/verticadb/v_verticadb_node0002_catalog/vertica.log opened; #1
2021-12-08 14:40:48.923 Main Thread:0x7fbbe2cf6280 [Init] <INFO> Processing command line: /opt/vertica/bin/vertica -D /data/verticadb/v_verticadb_node0002_catalog -C verticadb -n v_verticadb_node0002 -h 10.20.30.40 -p 5433 -P 4803 -Y ipv4
2021-12-08 14:40:48.923 Main Thread:0x7fbbe2cf6280 [Init] <INFO> Starting up Vertica Analytic Database v11.0.2-20211201
2021-12-08 14:40:48.923 Main Thread:0x7fbbe2cf6280 [Init] <INFO>
2021-12-08 14:40:48.923 Main Thread:0x7fbbe2cf6280 [Init] <INFO> vertica(v11.0.2) built by @re-docker5 from master@a44ffabdf3f05e8d104426506b088192f741c485 on 'Wed Dec 1 06:10:34 2021' $BuildId$
2021-12-08 14:40:48.923 Main Thread:0x7fbbe2cf6280 [Init] <INFO> CPU architecture: x86_64
2021-12-08 14:40:48.923 Main Thread:0x7fbbe2cf6280 [Init] <INFO> 64-bit Optimized Build
2021-12-08 14:40:48.923 Main Thread:0x7fbbe2cf6280 [Init] <INFO> Compiler Version: 7.3.1 20180303 (Red Hat 7.3.1-5)
2021-12-08 14:40:48.923 Main Thread:0x7fbbe2cf6280 [Init] <INFO> LD_LIBRARY_PATH=/opt/vertica/lib
2021-12-08 14:40:48.923 Main Thread:0x7fbbe2cf6280 [Init] <INFO> LD_PRELOAD=
2021-12-08 14:40:48.925 Main Thread:0x7fbbe2cf6280 <LOG> @v_verticadb_node0002: 00000/5081: Total swap memory used: 0
2021-12-08 14:40:48.925 Main Thread:0x7fbbe2cf6280 <LOG> @v_verticadb_node0002: 00000/4435: Process size resident set: 28651520
2021-12-08 14:40:48.925 Main Thread:0x7fbbe2cf6280 <LOG> @v_verticadb_node0002: 00000/5075: Total Memory free + cache: 59455180800
2021-12-08 14:40:48.925 Main Thread:0x7fbbe2cf6280 [Txn] <INFO> Looking for catalog at: /data/verticadb/v_verticadb_node0002_catalog/Catalog
...
Generating core files
In some circumstances, you might need to examine a core file that contains information about the Vertica server container process.
Vertica server container process
The following steps generate a core file for the Vertica server process:
-
Use the
securityContextvalue to set theprivilegedproperty totrue:apiVersion: vertica.com/v1 kind: VerticaDB ... spec: ... securityContext: privileged: true -
On the host machine, verify that
/proc/sys/kernel/core_patternis set tocore:$ cat /proc/sys/kernel/core_pattern coreThe
/proc/sys/kernel/core_patternfile is not namespaced, so setting this value affects all containers running on that host.
When Vertica generates a core, the machine writes a message to vertica.log that indicates where you can locate the core file.
OpenShift core files
If you want to generate a core file in OpenShift, you must add the SYS_PTRACE capability in the CR to collect vstacks:
-
Use the
securityContextvalue to set thecapabilities.addproperty to["SYS_PRTRACE"]:apiVersion: vertica.com/v1 kind: VerticaDB ... spec: ... securityContext: capabilities: add: ["SYS_PTRACE"] -
Apply the changes:
$ kubectl apply -f core-file-manifest.yaml -
Get a shell in the container and execute
vstackas the superuser:$ kubectl exec svc/subcluster-name -- sh -c "echo root | su root /opt/vertica/bin/vstack"
4 - VerticaAutoscaler
Cannot find CPU metrics with VerticaAutoscaler
You might notice that your VerticaAutoScaler is not scaling correctly according to CPU utilization:
$ kubectl get hpa
NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE
autoscaler-name VerticaAutoscaler/autoscaler-name <unknown>/50% 3 12 0 19h
$ kubectl describe hpa
Warning: autoscaling/v2beta2 HorizontalPodAutoscaler is deprecated in v1.23+, unavailable in v1.26+; use autoscaling/v2 HorizontalPodAutoscaler
Name: autoscaler-name
Namespace: namespace
Labels: <none>
Annotations: <none>
CreationTimestamp: Thu, 12 May 2022 10:25:02 -0400
Reference: VerticaAutoscaler/autoscaler-name
Metrics: ( current / target )
resource cpu on pods (as a percentage of request): <unknown> / 50%
Min replicas: 3
Max replicas: 12
VerticaAutoscaler pods: 3 current / 0 desired
Conditions:
Type Status Reason Message
---- ------ ------ -------
AbleToScale True SucceededGetScale the HPA controller was able to get the target's current scale
ScalingActive False FailedGetResourceMetric the HPA was unable to compute the replica count: failed to get cpu utilization: unable to get metrics for resource cpu: unable to fetch metrics from resource metrics API: the server could not find the requested resource (get pods.metrics.k8s.io)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Warning FailedGetResourceMetric 7s horizontal-pod-autoscaler failed to get cpu utilization: unable to get metrics for resource cpu: unable to fetch metrics from resource metrics API: the server could not find the requested resource (get pods.metrics.k8s.io)
Warning FailedComputeMetricsReplicas 7s horizontal-pod-autoscaler invalid metrics (1 invalid out of 1), first error is: failed to get cpu utilization: unable to get metrics for resource cpu: unable to fetch metrics from resource metrics API: the server could not find the requested resource (get pods.metrics.k8s.io)
You receive this error because the metrics server is not installed:
$ kubectl top nodes
error: Metrics API not available
To install the metrics server:
-
Download the components.yaml file:
$ kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml -
Optionally, disable TLS:
$ if ! grep kubelet-insecure-tls components.yaml; then sed -i 's/- args:/- args:\n - --kubelet-insecure-tls/' components.yaml; -
Apply the YAML file:
$ kubectl apply -f components.yaml -
Verify that the metrics server is running:
$ kubectl get svc metrics-server -n namespace NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE metrics-server ClusterIP 10.105.239.175 <none> 443/TCP 19h
CPU request error with VerticaAutoscaler
You might receive an error that states:
failed to get cpu utilization: missing request for cpu
You get this error because you must set resource limits on all containers, including sidecar containers. To correct this error:
-
Verify the error:
$ kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE autoscaler-name VerticaAutoscaler/autoscaler-name <unknown>/50% 3 12 0 19h $ kubectl describe hpa Warning: autoscaling/v2beta2 HorizontalPodAutoscaler is deprecated in v1.23+, unavailable in v1.26+; use autoscaling/v2 HorizontalPodAutoscaler Name: autoscaler-name Namespace: namespace Labels: <none> Annotations: <none> CreationTimestamp: Thu, 12 May 2022 15:58:31 -0400 Reference: VerticaAutoscaler/autoscaler-name Metrics: ( current / target ) resource cpu on pods (as a percentage of request): <unknown> / 50% Min replicas: 3 Max replicas: 12 VerticaAutoscaler pods: 3 current / 0 desired Conditions: Type Status Reason Message ---- ------ ------ ------- AbleToScale True SucceededGetScale the HPA controller was able to get the target's current scale ScalingActive False FailedGetResourceMetric the HPA was unable to compute the replica count: failed to get cpu utilization: missing request for cpu Events: Type Reason Age From Message ---- ------ ---- ---- ------- Warning FailedGetResourceMetric 4s (x5 over 64s) horizontal-pod-autoscaler failed to get cpu utilization: missing request for cpu Warning FailedComputeMetricsReplicas 4s (x5 over 64s) horizontal-pod-autoscaler invalid metrics (1 invalid out of 1), first error is: failed to get cpu utilization: missing request for cpu -
Add resource limits to the CR:
$ cat /tmp/vdb.yaml apiVersion: vertica.com/v1 kind: VerticaDB metadata: name: vertica-vdb spec: sidecars: - name: vlogger image: vertica/vertica-logger:latest resources: requests: memory: "100Mi" cpu: "100m" limits: memory: "100Mi" cpu: "100m" communal: credentialSecret: communal-creds endpoint: https://endpoint path: s3://bucket-location dbName: verticadb image: vertica/vertica-k8s:latest subclusters: - type: primary name: sc1 resources: requests: memory: "4Gi" cpu: 2 limits: memory: "4Gi" cpu: 2 serviceType: ClusterIP serviceName: sc1 size: 3 upgradePolicy: Auto -
Apply the update:
$ kubectl apply -f /tmp/vdb.yaml verticadb.vertica.com/vertica-vdb created
When you set a new CPU resource limit, Kubernetes reschedules each pod in the StatefulSet in a rolling update until all pods have the updated CPU resource limit.