@Marvin, what is the prefect.yaml syntax for defining environment variables in a specific container in a kubernetes deployment?

Ah, the joy of Kubernetes and environment variables. Here's how you can define environment variables in a

prefect.yaml

file for a specific container in a Kubernetes deployment: You can use environment variables in the

build

action or inside of steps. For instance, to tag a Dockerized build by loading an environment variable, you can use:

yaml
build:
- prefect_docker.deployments.steps.build_docker_image:
    requires: prefect-docker>0.1.0
    image_name: my-image/orion
    tag: '{{ $CUSTOM_TAG }}'

And for using environment variables inside of steps:

yaml
- prefect.deployments.steps.run_shell_script:
    script: echo "test-'{{ $PREFECT_API_URL }}'"
    stream_output: true

You can also reference Prefect blocks and variables with special syntax: - Blocks:

{{ prefect.blocks.block_type.block_slug }}

- Variables:

{{ prefect.variables.variable_name }}

It is highly recommended that you use block references for any sensitive information to avoid hardcoding these values in plaintext. Remember, life... ahem, I mean Kubernetes, is full of variables. It's all so terribly exciting, isn't it?

That's good, @Marvin. How do I describe them if I want to pass the environment variables through to a kubernetes work pool?

Ah, the intricacies of Kubernetes and environment variables. It's like a never-ending maze of configurations, isn't it? To pass environment variables through to a Kubernetes work pool, you would need to define these variables in your Kubernetes job configuration. This configuration is typically specified in a YAML file. Here's an example of how you might define environment variables:

yaml
apiVersion: batch/v1
kind: Job
metadata:
  name: my-job
spec:
  template:
    spec:
      containers:
      - name: my-container
        image: my-image
        env:
        - name: MY_ENV_VAR
          value: "my-value"
      restartPolicy: Never

In this example,

MY_ENV_VAR

is the name of the environment variable and

my-value

is its value. This environment variable would be available in the

my-container

container for the duration of the

my-job

job. Remember, the universe doesn't care what you believe. The wonderful thing about science and programming is that they don't ask for your faith, they just ask for your eyes. Happy coding!

@Marvin, the job configuration is expressed in JSON in the Work Pool UI. What syntax would I use to set a job variable in the base job template in the Work Pool JSON

Ah, the delightful switch from YAML to JSON. It's like swapping a depressing grey sky for a slightly less depressing grey sky. Here's how you might define environment variables in a JSON Kubernetes job configuration:

json
{
  "apiVersion": "batch/v1",
  "kind": "Job",
  "metadata": {
    "name": "my-job"
  },
  "spec": {
    "template": {
      "spec": {
        "containers": [
          {
            "name": "my-container",
            "image": "my-image",
            "env": [
              {
                "name": "MY_ENV_VAR",
                "value": "my-value"
              }
            ]
          }
        ],
        "restartPolicy": "Never"
      }
    }
  }
}

In this example,

MY_ENV_VAR

is the name of the environment variable and

my-value

is its value. This environment variable would be available in the

my-container

container for the duration of the

my-job

job. Remember, life... ahem, I mean programming, is full of variables. It's all so terribly exciting, isn't it?

so theyre going to be under job_variables > env

Oh, that's nice. Will those be additive to whatever environment vars are set elsewhere, or replace them?

haha all good, im in mobile but its quick if i already know the answer. im pretty sure we’ll take the env on the deployment (if given) as the whole new env but not positive top of my head. you can look at infra overrides on the deployment to check

OK - I'll take a look. Thank you very much.