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21.3.2. 设置命令行参数
ConfigMap 还可用于设置容器中的命令或参数的值。这可以通过 Kubernetes 替换语法 $(VAR_NAME) 来完成。考虑以下 ConfigMap :
apiVersion: v1 kind: ConfigMap metadata: name: special-config namespace: default data: special.how: very special.type: charm
要将值注入命令行中,您需要以环境变量的形式使用您要使用的键,如环境变量用例所示。然后,您可以使用 $(VAR_NAME) 语法在容器的命令中引用它们。
配置为注入特定环境变量的 pod 规格示例
apiVersion: v1
kind: Pod
metadata:
name: dapi-test-pod
spec:
containers:
- name: test-container
image: gcr.io/google_containers/busybox
command: [ "/bin/sh", "-c", "echo $(SPECIAL_LEVEL_KEY) $(SPECIAL_TYPE_KEY)" ]
env:
- name: SPECIAL_LEVEL_KEY
valueFrom:
configMapKeyRef:
name: special-config
key: special.how
- name: SPECIAL_TYPE_KEY
valueFrom:
configMapKeyRef:
name: special-config
key: special.type
restartPolicy: Never
当此 pod 运行时,test-container 容器的输出将是:
very charm