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Carlos Nogueira
Carlos Nogueira

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How to Deploy YAMLs with Deprecated Parameters on Kubernetes 1.16.0

#kubernetes #api #yaml #deprecated

The Kubernetes version 1.16.0 stopped to serve the following deprecated APIs:

  1. NetworkPolicy (in the extensions/v1beta1 API group):
    Migrate to use the networking.k8s.io/v1 API, available since v1.8. Existing persisted data can be retrieved/updated via the networking.k8s.io/v1 API.

  2. PodSecurityPolicy (in the extensions/v1beta1 API group):
    Migrate to use the policy/v1beta1 API, available since v1.10. Existing persisted data can be retrieved/updated via the policy/v1beta1 API.

  3. DaemonSet, Deployment, StatefulSet, and ReplicaSet (in the extensions/v1beta1 and apps/v1beta2 API groups)

You must check your older YAMLs. But changing the listed parameters in all files can be an exhausting task.

An option would be to convert the older files.

For example, lets deploy a NGINX using the file nginx.yaml.

apiVersion: extensions/v1beta1 kind: Deployment metadata: labels: run: nginx name: deploy-nginx spec: selector: matchLabels: run: nginx template: metadata: labels: run: nginx spec: containers: - image: nginx name: nginx
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The files nginx.yaml sets apiVersion: extensions/v1beta1 and it's compatible with kubernetes older versions, but not run on The last.
To convert the older YAML, using client 1.16 execute kubectl with the option convert:

kubectl convert -f nginx.yaml
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Command screen output would be like:

apiVersion: apps/v1 kind: Deployment metadata: creationTimestamp: null labels: run: nginx name: deploy-nginx spec: progressDeadlineSeconds: 2213489811 revisionHistoryLimit: 2213489811 selector: matchLabels: run: nginx strategy: rollingUpdate: maxSurge: 1 maxUnavailable: 1 type: RollingUpdate template: metadata: creationTimestamp: null labels: run: nginx spec: containers: - image: nginx imagePullPolicy: Always name: nginx resources: {} terminationMessagePath: /dev/termination-log terminationMessagePolicy: File dnsPolicy: ClusterFirst restartiPolicy: Always schedulerName: defaul-scheduler securityContext: {} terminationGracePeriodSeconds: 28 status: {}
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Paste the command output to a file(ex: nginxOUT.yaml)

kubectl convert -f nginx.yaml > nginxOUT.yaml
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Deploy

Using output file 

kubectl create -f nginxOUT.yaml
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Directly with the older file 

kubectl convert -f nginx.yaml | kubectl create -f -
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References

https://kubernetes.io/blog/2019/07/18/api-deprecations-in-1-16/

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