重新调度从一个节点到另一个节点的窗格

Question

So, I am writing a custom auto-rescheduler for my clusters and I am using Python Client library to do so. As the rescheduler is still in proposal and nothing has been done for it, the only known way is to delete the pod from overused node and let the replication controller and scheduler take care of the rest (make a new pod and assign it to an appropriate node). What I want to know is can I use the client library to move the pods from one node to another without deleting the pod. Basically, I want to create a pod in an appropriate node first and then delete the pod in the over-used node. Is that possible?

Answer 1

Using node label you can start the container in matching nodes. for this first you need set the node label and update the deployment file and apply it.

Here is the sample yml file I used for blue green deployment, see this help.

1. web server running on node labeled web

 apiVersion: extensions/v1beta1 kind: Deployment metadata: name: webserver-blue spec: replicas: 2 template: metadata: labels: type: webserver color: blue spec: containers: - image: nginx:1.12.0 name: webserver-container ports: - containerPort: 80 name: http-server nodeSelector: svrtype: web 

2. set another node label as newweb and update and deployment with different name and node label the config.

 apiVersion: extensions/v1beta1 kind: Deployment metadata: name: webserver-green spec: replicas: 2 template: metadata: labels: type: webserver color: green spec: containers: - image: nginx:1.13.0 name: webserver-container ports: - containerPort: 80 name: http-server nodeSelector: svrtype: newweb 

After testing you can remove the old one. the issue here is you can direct the traffic to only one deployment at a time.