dockerd set default environment variable for all containers

Question

I have a docker daemon running behind an HTTP proxy.

My Dockerfile's look like this:

FROM alpine:latest

RUN apk add --no-cache make gcc

Normally I configure the proxy by adding the http_proxy environment variable to the Dockerfile:

FROM alpine:latest

ENV http_proxy http://myproxy.mydomain.com:8080/

RUN apk add --no-cache make gcc

And that works fine.

But I don't want to touch the Dockerfile because it is also used in other environments where the proxy isn't available. I don't want to have ENV http_proxy ... in the Dockerfile at all.

So my question is: how to add an environment variable to all containers without touching the Dockerfiles?

@rustyxI posted my answer try this below

Chandru
– Chandru

2018-06-01 14:03:42 +00:00
Commented Jun 1, 2018 at 14:03 — Chandru
– Chandru, Commented Jun 1, 2018 at 14:03
Maybe related: stackoverflow.com/questions/34322631/…

Hemerson Varela
– Hemerson Varela

2018-06-01 14:03:54 +00:00
Commented Jun 1, 2018 at 14:03 — Hemerson Varela
– Hemerson Varela, Commented Jun 1, 2018 at 14:03

rustyx · Accepted Answer · 2018-06-01 15:34:23Z

1

Try like this

Dockerfile

FROM alpine:latest

ARG HTTP_PROXY_ARGUMENT

ENV http_proxy ${HTTP_PROXY_ARGUMENT}

RUN apk add --no-cache make gcc

Build like below

docker build -t --build-arg HTTP_PROXY_ARGUMENT=http://myproxy.mydomain.com:8080/ imagename .

edited Jun 1, 2018 at 15:34

rustyx

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answered Jun 1, 2018 at 13:43

Chandru

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Comments

Nicolas S. · Accepted Answer · 2018-06-01 13:31:20Z

0

With adding a environment variable on run ?

https://docs.docker.com/engine/reference/run/#env-environment-variables

answered Jun 1, 2018 at 13:31

Nicolas S.

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