config alpine's proxy in dockerfile

docker dockerfile

15,589

It seems like you're required to set http_proxy in your Dockerfile. If you do (e.g. for a specific, temporary reason - say you're building your container behind a corporate proxy) and subsequently don't need it anymore I'd suggest something like the following:

RUN export \
  http_proxy="http://some.custom.proxy:8080/” \
  https_proxy="https://some.custom.proxy:8080/" \
  \
  && < E.G. pip install requirements.txt> \
  \
  && unset http_proxy https_proxy

You can also use a more permanent solution in your Dockerfile by invoking ENV, but be aware that these are persisted and can lead to problems further down the road if you push/deploy your images somewhere else - Reference.

15,589

Author by

yuxh

Updated on June 04, 2022

Comments

yuxh almost 2 years
I use mvn clean package docker:build to invoke dockerfile(docker version 18.03.1-ce ) in machine B:
```
FROM openjdk:8-jdk-alpine
RUN  apk update && apk upgrade && apk add netcat-openbsd && apk add curl
```
it turns out:
```
Step 2/8 : RUN  apk update && apk upgrade && apk add netcat-openbsd && apk add curl

     ---> Running in 89c9b97b9d75
    fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/main/x86_64/APKINDEX.tar.gz
    fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/community/x86_64/APKINDEX.tar.gz
    ERROR: http://dl-cdn.alpinelinux.org/alpine/v3.7/main: temporary error (try again later)
    WARNING: Ignoring APKINDEX.70c88391.tar.gz: No such file or directory
```
I figure out it's network problem,machine B access internet by machine A,I have tried add "dns" in /etc/docker/daemon.json, "httpProxy" in ~/.docker/config.json , now I success in running:
```
`docker run -it cc2179b8f042`
apk update
```
but when I come back to use maven invoking dockfile ,it doesn't work. So how can I make dockfile work and tell me any difference between this two case.
- fly2matrix almost 6 years
  
  try passing a build-argument http_proxy with correct value.
- yuxh almost 6 years
  
  I use mvn clean package docker:build -Ddocker.buildArg.http_proxy=xx ,still not work. I fix it by adding "ENV http_proxy xx" in dockfile for now .
- fly2matrix almost 6 years
  
  You can try setting this in pom.xml , Take a look at github.com/spotify/dockerfile-maven/pull/41
- yuxh almost 6 years
  
  I use old docker-maven-plugin 1.1.1 and put a issue in github . I will check dockerfile-maven later.
Mayur over 5 years

Is there any config file so that we can specify proxy in it?
heldic over 5 years

Not sure if that's what you're aiming at, but you can configure a proxy for Docker, yes. The config file would be in ~/.docker/config.json - check this doc. You can also edit this in your Docker preferences if you use e.g. Docker for Mac
Mayur over 5 years

Hey @heldic Thanks for your comment. I was aiming for how to use/set proxy to build dockerfile. Using that proxy I supposed to download packages. I have set proxy as environment variable in docker file, but while building docker file it shows proxy error 'Permission denied' so is it any other way or its an issue with proxy server?