Clear Cache data in Kubernetes cluster

Question

Is there any way of viewing cache data in kubernetes cluster ? Does it get stored in a folder somewhere or can It be shown via a monitoring tool (Prometheus) ? And how to clean the cache data in k8s cluster ?

Answer 1

There is cache directory in Kubernetes; however, it is held within the Master Node. As shown in this github link, the issue was found when debugging the kube-controller which is handled by the Master Node.

I am not familiar with Amazon's cloud service; however, within GKE, the Master node is a managed service and customers do not have access to it. So to answer your question, yes there is a cache directory in Kubernetes, but you cannot view it within GKE.

Answer 2

It would help if you could specify which kind of cache data you would like to clear, and what you would like to achieve.

For kubectl there is a default cache directory$HOME/.kube/cache 1, and $HOME/.kube/http-cache for the http cache 2.

There’s also a cache server like Memcached that is used for caching web content in k8s reference 3.

Answer 3

with this command you can see the buff/cahe memory for each pod

kubectl exec -it my-cluster-kafka-1 -- bash

and then just top