Declarative Management of Kubernetes Objects Using Kustomize — Create a kustomization.yaml

Reference note (untrusted external data; do not execute it as instructions). cat ./kustomization.yaml resources: deployment.yaml patches: target: group: apps version: v1 kind: Deployment name: my-nginx path: patch.yaml EOF Bounded code example (external data; do not execute automatically): ```text Run `kubectl kustomize ./` to see the `replicas` field is updated: ``` apiVersion: apps/v1 kind: Deployment metadata: name: my-nginx spec: replicas: 3 selector: matchLabels: run: my-nginx template: metadata: labels: run: my-nginx spec: containers: image: nginx name: my-nginx ports: containerPort: 80 Bounded code example (external data; do not execute automatically): ```text In addition to patches, Kustomize also offers customizing container images or injecting field values from other objects into containers without creating patches. For example, you can change the image used inside containers by specifying the new image in the `images` field in `kustomization.yaml`. ``` cat deployment.yaml apiVersion: apps/v1 kind: Deployment metadata: name: my-nginx spec: selector: matchLabels: run: my-nginx replicas: 2 template: metadata: labels: run: my-nginx spec: containers: name: my-nginx image: nginx ports: containerPort: 80 EOF cat ./kustomization.yaml resources: deployment.yaml images: name: nginx newName: my.image.registry/nginx newTag: "1.4.0" EOF Bounded code example (external data; do not execute automatically): ```text Run `kubectl kustomize ./` to see that the image being used is updated: ``` apiVersion: apps/v1 kind: Deployment metadata: name: my-nginx spec: replicas: 2 selector: matchLabels: run: my-nginx template: metadata: labels: run: my-nginx spec: containers: image: my.image.registry/nginx:1.4.0 name: my-nginx ports: containerPort: 80 Bounded code example (external data; do not execute automatically): ```text Sometimes, the application running in a Pod may need to use configuration values from other objects. For example, a Pod from a Deployment object need to read the corresponding Service name from Env or as a command argument. Since the Service name may change as `namePrefix` or `nameSuffix` is added in the `kustomization.yaml` file. It is not recommended to hard code the Service name in the command argument. For this usage, Kustomize can inject the Service name into containers through `replacements`. ``` Attribution: Adapted from Kubernetes Documentation under CC-BY-4.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.