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How to scale down OpenShift/Kubernetes pods automatically on a schedule?

By : Balaji Makam
Date : October 18 2020, 06:10 AM
may help you . OpenShift, like Kubernetes, is an api-driven application. Essentially all application functionality is exposed over the control-plane API running on the master hosts.
You can use any orchestration tool that is capable of making API calls to perform this activity. Information on calling the OpenShift API directly can be found in the official documentation in the REST API Reference Overview section.
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kubernetes no nodes available to schedule pods in coreos

By : Michael
Date : March 29 2020, 07:55 AM
I wish this help you I found the Solution, the reason is the version of kube-apiserver,kube-controller-manager and kube-scheduler does not match with the kubelet.
the detail: https://github.com/kubernetes/kubernetes/issues/17154

no nodes available to schedule pods - Running Kubernetes Locally with No VM

By : yogesh garg
Date : March 29 2020, 07:55 AM
I wish did fix the issue. It means there's no available nodes in the system for the pods to be scheduled on. Can you provide the output of kubectl get nodes and kubectl describe nodes?
Following steps descirbed in the local cluster doc should give you a single node. If your node is there (it should be) but just not ready, you can look at the log in /tmp/kubelet.log (in the future, if you're not using local cluster, look for /var/log/kubelet.log instead) to figure out possible causes.

Can kubernetes schedule multiple unrelated pods on one host?

By : Anshu
Date : March 29 2020, 07:55 AM
This might help you In fact kubernetes will do exactly what you want by default. It is capable of running dozens if not hundreds of containers on a single host (depending on its specs).
If you want very advanced control over scheduling pods, there is an alpha feature for that, which introduces concept of node/pod (anti)affinities. But I would say it is a rather advanced k8s topic at the moment, so you are probably good with what is in stable/beta for most use cases.

Avoid parallel processing of pods in an OpenShift/Kubernetes cluster

By : SteveO
Date : March 29 2020, 07:55 AM
Any of those help This has to be done by the application, because Kubernetes deliberately does not provide these application-tier primitives out of the box. There are ways to orchestrate things such that Kubernetes will generally keep only one pod running, but the guarantees offered by that orchestration are limited.
Using a durable datastore to coordinate ownership of a responsibility at the application tier is a good idea, and using a "locked" attribute or similar is also fine. The typical way the problem of ensuring "liveness" is handled is by having the responsible application periodically update a last-update timestamp in that datastore. Then the secondary application can keep tabs on the interval since the last update.

Kubernetes/Openshift pods with PVC retain their cluster name and IP?

By : 穿堂而过的风
Date : March 29 2020, 07:55 AM
it helps some times ClusterIP is not a property of Pod. It's a property of Service. Unless you delete and recreate the Service - its ClusterIP will stay the same no matter how many times Pods behind it will be restarted.
Regarding Pod IPs - they can definitely change unless they are a part of StatefulSet. Pods in StatefulSet preserve their IPs on restarts.
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