Pass environment variable to container

[Yu-Qi]

My application layer determine which mode according to environment variable.
Is any way to pass environment variable to container?
The current workaround is the ldflags, but the changing cost seem high...

[imjasonh]

I believe #632 was an attempt to try to fix this, by letting you configure runtime envs in your .ko.yaml file.

I'd still like to do that, but probably not until after we've moved the repo (#791). In the meantime, you have some other options:

1. Pass the env var at runtime:

• docker run --env=FOO=bar $image
• or for Kubernetes:

containers:
- image: ko://github.com/org/repo/cmd/app
  env:
  - name: FOO
    value: bar

2. After building the image, modify it to set the image's env config, e.g., using crane mutate:

img=$(ko build ./cmd/app)
img=$(crane mutate $img --env FOO=bar)
# deploy $img

Neither of these are ideal, but they should work today, until we can get this added to ko itself.

[Yu-Qi]

Cool. It's a good tutorial!!
I close it