2020-06-19 14:25:28 +08:00
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# Application Configuration
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本文基于 OAM v1alpha2 版本。
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`ApplicationConfiguration` 将 `Component` 与 `Trait` 组合，定义了一个应用程序的配置，`Component` 每部署一次就会产生一个实例（`Instance`），实例是可以被升级的（包括回滚和重新部署），而每次部署和升级就会产生一次新的发布（`Release`）。
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2020-06-19 14:47:22 +08:00
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> [12 因素应用](https://12factor.net/zh_cn/)严格区分[构建、发布、运行](https://12factor.net/zh_cn/build-release-run)这三个步骤。每次构建和修改配置后都会产生一次新的发布（`Release`）。OAM 中将 `Component`、`Trait`、`ApplicaitonScope` 组合而成的 `ApplicationConfiguration` 即等同于 `Release`。每次对 `ApplciationConfiguration` 的更新都会创建一个新的 `Release`（跟 [Helm](https://helm.sh) 中的 `Release` 概念一致）。
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2020-06-19 14:25:28 +08:00
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下面是一个 `ApplicationConfiguration` 示例。
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```yaml
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apiVersion: core.oam.dev/v1alpha2
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kind: ApplicationConfiguration
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metadata:
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name: my-app
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annotations:
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version: v1.0.0
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description: "My first application deployment."
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spec:
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components:
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- componentName: my-component
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parameterValues:
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- name: PARAMETER_NAME
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value: SUPPLIED_VALUE
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- name: ANOTHER_PARAMETER
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value: "AnotherValue"
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traits:
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- name: manualscaler.core.oam.dev
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version: v1
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spec:
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replicaCount: 3
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scopes:
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- scopeRef:
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apiVersion: core.oam.dev/v1alpha2
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kind: NetworkScope
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name: my-network
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```
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关于 `ApplicationConfiguration` 的详细信息参考 OAM 中的 [ApplicationConfiguration 规范](https://github.com/oam-dev/spec/blob/master/7.application_configuration.md)。
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## 参考
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- [The Open Application Model specification - github.com](https://github.com/oam-dev/spec)
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