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In the ReplicaSet, .spec.template.metadata.labels must match spec.selector, or it will be rejected by the API.
The .spec.selector field is a label selector. As discussed earlier these are the labels used to identify potential Pods to acquire. In our frontend.yaml example, the selector was:
Note: For 2 ReplicaSets specifying the same .spec.selector but different .spec.template.metadata.labels and .spec.template.spec fields, each ReplicaSet ignores the Pods created by the other ReplicaSet.
Replicas
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| apiVersion: apps/v1 | |
| kind: ReplicaSet | |
| metadata: | |
| name: frontend | |
| labels: | |
| app: guestbook | |
| tier: frontend | |
| spec: | |
| # modify replicas according to your case | |
| replicas: 3 | |
| selector: | |
| matchLabels: | |
| tier: frontend | |
| template: | |
| metadata: | |
| labels: | |
| tier: frontend | |
| spec: | |
| containers: | |
| - name: php-redis | |
| image: scmgalaxy/nginx-devopsschoolv1 | |
| apiVersion: apps/v1 | |
| kind: ReplicaSet | |
| metadata: | |
| name: my-replicaset | |
| spec: | |
| replicas: 2 | |
| selector: | |
| matchLabels: | |
| app: my-app | |
| template: | |
| metadata: | |
| labels: | |
| app: my-app | |
| spec: | |
| containers: | |
| - name: my-container | |
| image: nginx |
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