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How to expand environment variables coming from a secret store and pass them inside a docker container?. Said docker container does not have a shell, therefore it is not possible to run a script. This is the sample yaml file

        envFrom:
        - secretRef:
            name: secret     
        command: ["my-command"]
        args:
          - "--env=ENV1=${MY_ENV_VAR1}"
          - "--env=env2=${MY_ENV_VAR2}"

How to expand environment variables coming from a secret store and pass them inside a docker container?. Said docker container does not have a shell, therefore it is not possible to run a script. This is the sample yaml file

        envFrom:
        - secretRef:
            name: secret     
        command: ["my-command"]
        args:
          - "--env=ENV1=${MY_ENV_VAR1}"
          - "--env=env2=${MY_ENV_VAR2}"

• kubernetes

Share Improve this question Follow edited Feb 25 at 0:40 David Maze 160k4545 gold badges243243 silver badges287287 bronze badges asked Feb 24 at 18:41 TucanTucan 17211 silver badge1111 bronze badges 1

• Where does MY_ENV_VAR1 actually come from? What do you expect to set it? The args: setting sort of suggests the program expects an actual environment variable, can you use env: [{ name: ENV1, valueFrom: ... }] to set the variables without trying to wire them through command-line arguments? – David Maze Commented Feb 24 at 19:46

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1 Answer 1

Sorted by: Reset to default 3

You can pass environment variables to your arguments by using parentheses () instead of braces {}

    envFrom:
    - secretRef:
        name: secret     
    command: ["my-command"]
    args:
      - "--env=ENV1=$(MY_ENV_VAR1)"
      - "--env=env2=$(MY_ENV_VAR2)"

Kubernetes docs have an example here for reference: https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/#use-environment-variables-to-define-arguments

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