I have a dockerfile that looks like this at the moment:
FROM golang:1.8-alpine
COPY ./ /src
ENV GOOGLE_CLOUD_PROJECT = "snappy-premise-118915"
RUN apk add --no-cache git && \
apk --no-cache --update add ca-certificates && \
cd /src && \
go get -t -v cloud.google.com/go/pubsub && \
CGO_ENABLED=0 GOOS=linux go build main.go
# final stage
FROM alpine
ENV LATITUDE "-121.464"
ENV LONGITUDE "36.9397"
ENV SENSORID "sensor1234"
ENV ZIPCODE "95023"
ENV INTERVAL "3"
ENV GOOGLE_CLOUD_PROJECT "snappy-premise-118915"
ENV GOOGLE_APPLICATION_CREDENTIALS "/app/key.json"
ENV GRPC_GO_LOG_SEVERITY_LEVEL "INFO"
RUN apk --no-cache --update add ca-certificates
WORKDIR /app
COPY --from=0 /src/main /app/
COPY --from=0 /src/key.json /app/
ENTRYPOINT /app/main
and the pod config looks like this:
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: sensorpub
spec:
template:
metadata:
labels:
app: sensorpub
spec:
volumes:
- name: google-cloud-key
secret:
secretName: pubsub-key
containers:
- name: sensorgen
image: gcr.io/snappy-premise-118915/sensorgen:v1
volumeMounts:
- name: google-cloud-key
mountPath: /var/secrets/google
env:
- name: GOOGLE_APPLICATION_CREDENTIALS
value: /var/secrets/google/key.json
I want to be able to pass in these environment vars:
ENV LATITUDE "-121.464"
ENV LONGITUDE "36.9397"
ENV SENSORID "sensor1234"
ENV ZIPCODE "95023"
ENV INTERVAL "3"
ENV GOOGLE_CLOUD_PROJECT "snappy-premise-118915"
ENV GOOGLE_APPLICATION_CREDENTIALS "/app/key.json"
ENV GRPC_GO_LOG_SEVERITY_LEVEL "INFO"
I want to be able to set the environment variables in the pod config so that the docker file can use those...how do I do that instead of just coding them into the docker image directly?
I want to be able to set the environment variables in the pod config so that the docker file can use those...how do I do that instead of just coding them into the docker image directly?
There is no need to specify any ENV
directive in a Dockerfile; those directives only provide defaults in the case where (as in your example PodSpec
) they are not provided at runtime.
The "how" is to do exactly what you have done in your example PodSpec
: populate the env:
array with the environment variables you wish to appear in the Pod