Kubernetes:如何从另一个环境变量引用一个环境变量? [英] Kubernetes: How to refer to one environment variable from another?

问题描述

我有一个Deployment对象，使用

I've a Deployment object where I expose the POD ID using the Downward API. That works fine. However, I want to set up another env variable, log path, with reference to the POD ID. But, setting that variable value to /var/log/mycompany/${POD_ID}/logs isn't working, no logs are created in the container. I can make the entrypoint script or the app aware of the POD ID, and build up the log path, but I'd rather not do that.

推荐答案

正确的语法是使用$(FOO)，如

The correct syntax is to use $(FOO), as is described in the v1.EnvVar value: documentation; the syntax you have used is "shell" syntax, which isn't the way kubernetes interpolates variables. So:

containers:
- env:
  - name: POD_ID
    valueFrom: # etc etc
  - name: LOG_PATH
    value: /var/log/mycompany/$(POD_ID)/logs

还请注意，如文档中所述，必须在引用该变量的变量之前定义要扩展的变量.

Also please note that, as mentioned in the Docs, the variable to expand must be defined before the variable referencing it.

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