CODEWITHSUNDEEP
javaspringspring-bootspring-cloudspring-cloud-config
Mathias Dpunkt
Mathias Dpunkt

Reputation: 12184

Spring Cloud Config Server Priority of Environment Variables

I have a question regarding the priority of environment variables when working with spring cloud config server

In my service I have a local properties file application.yml with this content

foo:
  bar: "some"
  buz: "some"
  joe: "some"

The service is also connected to a config server with a configuration repository that contains a file testservice-api.yml (where testservice-api is the spring application name of the service). The contents of this file is:

foo:
  bar: "some-specific"

So with this setup the configuration at runtime would result in this:

{
    "foo.bar": "some-specific",
    "foo.buz": "some",
    "foo.joe": "some"
}

Now I try to override foo.bar and foo.joe with an environment variable.

So I start the service with this command:

FOO_BAR=some-env FOO_JOE=some-env gradle bootRun

From what I read in this part of the spring boot documentation the environment variables should have priority over the configuration files - also the spring cloud config documentation does not state sth different - so I would expect the result to be:

{
    "foo.bar": "some-env",
    "foo.buz": "some",
    "foo.joe": "some-env"
}

But instead I get:

{
    "foo.bar": "some-specific",
    "foo.buz": "some",
    "foo.joe": "some-env"
}

So only the configuration from the local configuration file inside the jar is overridden by the environment variable - the property from the config repo seems to have priority over the environment variable.

Is this explainable - Or is this a bug? Any hints in this one?

Please find the example code here:

https://github.com/mduesterhoeft/configserver-test

The README in the repository lists the issue described here as Use Case 3

Upvotes: 12

Views: 11469

Answers (1)

user1789538
user1789538

Reputation: 163

define following properties in git repo (as a source for config-server) [for given profile]: spring.cloud.config: overrideSystemProperties: false overrideNone: true

keep in mind properties (especially overrideSystemProperties & overrideNone) in bootsrap.yml are overriden by those from config-server by default

Upvotes: 13

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