Troubleshooting Avi Kubernetes Operator
AKO is an operator which works as an ingress controller and performs Avi-specific functions in an OpenShift/Kubernetes environment with the Avi Controller. It runs as a pod in the cluster and translates the required OpenShift/Kubernetes objects to Avi objects and automates the implementation of ingresses/routes/services on the Service Engines (SE) via the Avi Controller.
This article is a list of troubleshooting steps to use in case there are issues when using AKO.
1. AKO Pod Does Not Run
To check why the pod is not running, do the following:
kubectl get pods -n avi-system NAME READY STATUS RESTARTS AGE ako-f776577b-5zpxh 0/1 ImagePullBackOff 0 15s
- Your Docker registry is optimally configured.
- The image is configured locally.
2. AKO Does Not Respond to the Ingress Object Creations
Look into the AKO container logs and see if you find a reason on why the sync is disabled like this:
2020-06-26T10:27:26.032+0530 INFO lib/lib.go:56 Setting AKOUser: ako-my-cluster for Avi Objects 2020-06-26T10:27:26.337+0530 ERROR cache/controller_obj_cache.go:1814 Required param networkName not specified, syncing will be disabled. 2020-06-26T10:27:26.337+0530 WARN cache/controller_obj_cache.go:1770 Invalid input detected, syncing will be disabled.
3. Ingress Object Does Not Sync in Avi
- The ingress class is set as something other than
defaultIngControllerparameter is set to True.
- For TLS ingress, the
Secretobject does not exist. Ensure that the Secret object is pre-created.
- Check the connectivity between your AKO Pod and the Avi Controller.
4. Virtual Service Returns The Message CONNECTION REFUSED After Sometime
This is generally due to a duplicate IP in use in the network.
5. Virtual Service Settings Changed Directly on the Avi Vantage Controller is Overwritten
It is not recommended to change the properties of a virtual service by AKO, outside of AKO. If AKO has an ingress update that is related to this shared virtual service, then AKO will overwrite the configuration.
6. Static Routes are Populated, but the Pools are Down
Check if you have a dual network interface card (NIC) Kubernetes worker node setup.
In case of a dual NIC setup, AKO would populate the static routes using the default gateway network.
However, the default gateway network might not be the port group network that you want to use as the data network.
Hence, the service engines may not be able to reach the pod CIDRs using the default gateway network.
If it is not possible to make your data networks routable via the default gateway,
disableStaticRoute sync in AKO and edit your static routes with the correct network.
For every log collection, collect the following information too:
- What kubernetes distribution are you using? For example, RKE, PKS etc.
- What is the CNI you are using with versions? For example, Calico v3.15
- What is the Avi Controller version you are using? For example, Avi Vantage version 18.2.8
Collecting AKO Logs
To collect the logs, use the script available here and collect all relevant information for the AKO pod.
The script does the following:
- Collects the log file of AKO pod
- Collects the
configmapin a yaml file
- Zips the folder and returns
The following three cases are considered for log collection:
A running AKO pod logging into a Persistent Volume Claim, in this case the logs are collected from the PVC that the pod uses.
A running AKO pod logging into console, in this case the logs are collected from the pod directly.
A dead AKO pod that uses a Persistent Volume Claim, in this case a backup pod is created with the same PVC attached to the AKO pod and the logs are collected from it.
Configuring PVC for the AKO Pod
It is recommended to use a Persistent Volume Claim for the AKO pod.
To create a persistent volume(PV) and a Persistent Volume Claim(PVC), refer to the Configure a Pod to Use a Persistent Volume for Storage article.
This is an example of hostpath persistent volume. Use the PV based on the storage class of your kubernetes environment.
To create persistent volume,
#persistent-volume.yaml apiVersion: v1 kind: PersistentVolume metadata: name: ako-pv namespace : avi-system labels: type: local spec: storageClassName: manual capacity: storage: 10Gi accessModes: - ReadWriteOnce hostPath: path: <any-host-path-dir> # make sure that the directory exists
A persistent volume claim can be created using the following:
#persistent-volume-claim.yaml apiVersion: v1 kind: PersistentVolumeClaim metadata: name: ako-pvc namespace : avi-system spec: storageClassName: manual accessModes: - ReadWriteOnce resources: requests: storage: 3Gi
Add PVC name into the
ako/helm/ako/values.yamlbefore the creation of the AKO pod as shown below:
persistentVolumeClaim: ako-pvc mountPath: /log logFile: avi.log
Using the Script for AKO
Use case 1
With PVC, (Mandatory) –akoNamespace (-ako) : The namespace in which the AKO pod is present.
python3 log_collections.py -ako avi-system
Use case 2
Without PVC (Optional) –since (-s) : time duration from present time for logs.
python3 log_collections.py -ako avi-system -s 24h
At each stage of execution, the commands being executed are logged on the screen. The results are stored in a zip file with the format below:`
ako-<helmchart name>-<current time>
Sample Output with PVC:
2020-06-25 13:20:37,141 - ******************** AKO ******************** 2020-06-25 13:20:37,141 - For AKO : helm list -n avi-system 2020-06-25 13:20:38,974 - kubectl get pod -n avi-system -l app.kubernetes.io/instance=my-ako-release 2020-06-25 13:20:41,850 - kubectl describe pod ako-56887bd5b7-c2t6n -n avi-system 2020-06-25 13:20:44,019 - helm get all my-ako-release -n avi-system 2020-06-25 13:20:46,360 - PVC name is my-pvc 2020-06-25 13:20:46,361 - PVC mount point found - /log 2020-06-25 13:20:46,361 - Log file name is avi.log 2020-06-25 13:20:46,362 - Creating directory ako-my-ako-release-2020-06-25-132046 2020-06-25 13:20:46,373 - kubectl cp avi-system/ako-56887bd5b7-c2t6n:log/avi.log ako-my-ako-release-2020-06-25-132046/ako.log 2020-06-25 13:21:02,098 - kubectl get cm -n avi-system -o yaml > ako-my-ako-release-2020-06-25-132046/config-map.yaml 2020-06-25 13:21:03,495 - Zipping directory ako-my-ako-release-2020-06-25-132046 2020-06-25 13:21:03,525 - Clean up: rm -r ako-my-ako-release-2020-06-25-132046 Success, Logs zipped into ako-my-ako-release-2020-06-25-132046.zip
Route Objects did not Sync with Avi
This could be due to different reasons: Some common issues are as follows:
The problem is for all routes.
Some configuration parameter is missing. Check for logs like
Invalid input detected, syncing will be disabled.. Make the necessary changes in the configuration by checking the logs and restarting AKO.
Some routes are not getting handled in AKO.
Check if the sub-domain of the route is valid as per Avi Controller configuration,
Didn't find match for hostname :foo.abc.com Available sub-domains:avi.internal.
The problem is faced by one or few routes.
Check for the status of the route. If you see the message
MultipleBackendsWithSameServiceError, then the same service has been added multiple times in the backend. This configuration is incorrect and the route configuration has to be changed.
The route which is not getting synced, is a secure route with edge/re-encrypt termination.
Check if both the key and the certificate are specified in the route spec. If either of these keys are missing, AKO would not sync the route.
Custom Resource Definitions
The Policy Defined in the CRD Policy was not Applied to the Corresponding Ingress/Route Objects
- Make sure that the policy object being referred by the CRD is present in Avi.
- Ensure that connectivity between the AKO pod and the Avi Controller is intact. For example, if the Avi Controller is rebooting, connectivity may go down and cause this issue.
Document Revision History
|September 17, 2020||Published the Troubleshooting Guide for AKO version 1.2.1|
|July 20, 2020||Published the Troubleshooting Guide for AKO version 1.2.1 (Tech Preview)|