Override configuration with environment variables if they exist

[gacerioni]

Override configuration with environment variables if they exist.

Hey, team. This is your friend Gabs from Harness, and I have a quick suggestion to allow us to provide some important configuration that overrides the config file app.config when necessary.

For example, during my CD Pipeline, I will retrieve the Redis details from a Vault Server, using Harness expressions (<+secrets.getValue("redis_host")>) and use it in the K8s Deployment -> Pod -> Container environment variables.

For example, I create a Secret or a Configmap to hold these, but then I serve the variables for the python app at runtime, with K8s's envFrom.

Small test:

1-) using a bad redis endpoint, the test will fail:

(env) root@DESKTOP-S8EV48S:~/REDIS/REDIS_PYTHON/ru102py# export REDIS_HOST=cerioni.platformengineer.io
(env) root@DESKTOP-S8EV48S:~/REDIS/REDIS_PYTHON/ru102py# pytest ./tests/test_hello.py
FAIL!!!

2-) now the good old redis that I have in my godaddy domain:

(env) root@DESKTOP-S8EV48S:~/REDIS/REDIS_PYTHON/ru102py# export REDIS_HOST=redis.platformengineer.io
(env) root@DESKTOP-S8EV48S:~/REDIS/REDIS_PYTHON/ru102py# pytest ./tests/test_hello.py
SUCCESS!!!
<...> 1 passed in 2.08s

Cheers!

[gacerioni]

Howdy! Can ping me on https://www.linkedin.com/in/gabrielcerioni