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206 lines
4.0 KiB
Markdown
206 lines
4.0 KiB
Markdown
# 60 秒构建一个 Exec 插件
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本教程只是一个快速开始的示例，完整的插件文档请看：[kustomize 插件](plugins.md)
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本示例将使用 bash 编写了一个简单的 _exec_ 插件，用来生成一个 `ConfigMap`。
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尝试本教程不会破坏你的当前设置。
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#### 环境要求
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* `linux`
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* `git`
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* `curl`
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* `Go 1.13`
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## 创建一个工作空间/目录
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```
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DEMO=$(mktemp -d)
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```
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## 编写 kustomization
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新建一个目录来保存所有的配置：
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```
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MYAPP=$DEMO/myapp
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mkdir -p $MYAPP
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```
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编写一个 Deployment 配置：
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```
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cat <<'EOF' >$MYAPP/deployment.yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: the-deployment
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spec:
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replicas: 3
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template:
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spec:
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containers:
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- name: the-container
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image: monopole/hello:1
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command: ["/hello",
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"--port=8080",
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"--date=$(THE_DATE)",
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"--enableRiskyFeature=$(ENABLE_RISKY)"]
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ports:
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- containerPort: 8080
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env:
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- name: THE_DATE
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valueFrom:
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configMapKeyRef:
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name: the-map
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key: today
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- name: ALT_GREETING
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valueFrom:
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configMapKeyRef:
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name: the-map
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key: altGreeting
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- name: ENABLE_RISKY
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valueFrom:
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configMapKeyRef:
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name: the-map
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key: enableRisky
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EOF
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```
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编写一个 service 配置：
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```
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cat <<EOF >$MYAPP/service.yaml
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kind: Service
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apiVersion: v1
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metadata:
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name: the-service
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spec:
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type: LoadBalancer
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ports:
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- protocol: TCP
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port: 8666
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targetPort: 8080
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EOF
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```
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现在为您要编写的插件创建一个配置文件。
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这个配置文件的内容也是 k8s 资源对象。其中 `apiVersion` 和 `kind` 字段的值用于在文件系统中查找插件代码（稍后会对此进行更多介绍）。
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```
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cat <<'EOF' >$MYAPP/cmGenerator.yaml
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apiVersion: myDevOpsTeam
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kind: SillyConfigMapGenerator
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metadata:
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name: whatever
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argsOneLiner: Bienvenue true
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EOF
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```
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最后在 kustomization 文件中引用以上所有内容：
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```
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cat <<EOF >$MYAPP/kustomization.yaml
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commonLabels:
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app: hello
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resources:
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- deployment.yaml
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- service.yaml
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generators:
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- cmGenerator.yaml
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EOF
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```
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检查这些文件
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```
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ls -C1 $MYAPP
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```
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## 为插件创建目录
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插件必须位于特定的目录，以便 Kustomize 能够找到它们。
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该示例将使用临时目录：
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```
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PLUGIN_ROOT=$DEMO/kustomize/plugin
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```
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在上面定义的插件配置 `$MYAPP/cmGenerator.yaml` 中指定：
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> ```
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> apiVersion: myDevOpsTeam
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> kind: SillyConfigMapGenerator
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> ```
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这意味着该插件必须位于以下目录中：
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```
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MY_PLUGIN_DIR=$PLUGIN_ROOT/myDevOpsTeam/sillyconfigmapgenerator
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mkdir -p $MY_PLUGIN_DIR
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```
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插件的目录结构为： `apiVersion 的 value/小写 kind 的 value`。
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插件拥有自己的目录，不但可以保存插件代码，还可以保存测试代码以需要的补充数据文件。
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## 编写插件
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插件有 _exec_ 和 _Go_ 两种.
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编写一个 _exec_ 插件，将其安装到正确的目录，文件名必须与插件的类型匹配（在本例中为 `SillyConfigMapGenerator`）：
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```
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cat <<'EOF' >$MY_PLUGIN_DIR/SillyConfigMapGenerator
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#!/bin/bash
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# Skip the config file name argument.
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shift
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today=`date +%F`
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echo "
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kind: ConfigMap
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apiVersion: v1
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metadata:
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name: the-map
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data:
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today: $today
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altGreeting: "$1"
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enableRisky: "$2"
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"
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EOF
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```
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根据定义，_exec_ 插件必须是可执行的：
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```
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chmod a+x $MY_PLUGIN_DIR/SillyConfigMapGenerator
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```
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## 安装 kustomize
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根据[文档](INSTALL.md)安装 kustomize:
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```
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curl -s "https://raw.githubusercontent.com/\
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kubernetes-sigs/kustomize/master/hack/install_kustomize.sh" | bash
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mkdir -p $DEMO/bin
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mv kustomize $DEMO/bin
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```
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## 检查目录结构
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```
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tree $DEMO
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```
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## 使用插件构建 APP:
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```
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XDG_CONFIG_HOME=$DEMO $DEMO/bin/kustomize build --enable_alpha_plugins $MYAPP
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```
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之前如果您已经设置了 `PLUGIN_ROOT=$HOME/.config/kustomize/plugin`，则无需在 _kustomize_ 命令前使用 `XDG_CONFIG_HOME`。
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