CODEWITHSUNDEEP
dockerproxywindows-10containers
amique
amique

Reputation: 2236

Docker at Windows 10 proxy propagation to containers not working

I am behind cooperate proxy and running docker on windows 10. I have setup the proxy on docker as per the documentation here.

my docker proxy settings

I am able to pull images but these proxy settings are not propagating to containers e.g. when I run alpine env, it does not show proxy conf. Below is my output

λ docker run alpine env                                          
  PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
  HOSTNAME=14fca5bee12f                                            
  HOME=/root

Following is the expected output as per the documentation.

exptected output

On building following docker file, I get connection errors from alpine container

Docker Version

Docker version 17.12.0-ce, build c97c6d6

DockerFile

FROM alpine:latest
ADD HelloWorld.class HelloWorld.class
RUN apk --update add openjdk8-jre
ENTRYPOINT ["java", "-Djava.security.egd=file:/dev/./urandom", "HelloWorld"]

Error

Step 3/4 : RUN apk --update add openjdk8-jre                                                                      
 ---> Running in 1205b24d5044                                                                                     
fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/main/x86_64/APKINDEX.tar.gz                                       
ERROR: http://dl-cdn.alpinelinux.org/alpine/v3.7/main: could not connect to server (check repositories file)      
WARNING: Ignoring APKINDEX.70c88391.tar.gz: No such file or directory                                             
fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/community/x86_64/APKINDEX.tar.gz                                  
ERROR: http://dl-cdn.alpinelinux.org/alpine/v3.7/community: could not connect to server (check repositories file) 
WARNING: Ignoring APKINDEX.5022a8a2.tar.gz: No such file or directory                                             
ERROR: unsatisfiable constraints:                                                                                 
  openjdk8-jre (missing):                                                                                         
    required by: world[openjdk8-jre]                                                                              
The command '/bin/sh -c apk --update add openjdk8-jre' returned a non-zero code: 1

Passing Proxy as build-arg

I tried the following command and it worked. Is there any other way to automatically propagate the proxy settings as mentioned in documentation (see link above)

docker build --tag "docker-hello-world:latest" . --build-arg http_proxy=http://<username>:<password>@proxy_address:proxy_port/ --build-arg https_proxy=http://<username>:<password>@proxy_address:proxy_port/ --build-arg no_proxy=localhost,127.0.0.1

Upvotes: 12

Views: 11762

Answers (2)

Simon30
Simon30

Reputation: 356

I struggled making it work but finally found a working solution on my side.

I'm behind a corporate proxy and have a CNTLM properly configured on windows and linked in my docker desktop settings with address 127.0.0.1:3128. My docker runs under WSL2.

The magic tip hereis to link your containers proxies to docker internal proxy host.docker.internal.

Basically host.docker.internal redirects to the host your container is currently running onto https://docs.docker.com/desktop/networking/#i-want-to-connect-from-a-container-to-a-service-on-the-host

Upvotes: 1

Niklas Rosencrantz
Niklas Rosencrantz

Reputation: 26671

I had the same problem. Pulling images was working but provisioning a container was not working. In this case the solution was to provide Docker with a configuration file named ~/.docker/config.json with the following contents.

{
 "proxies":
 {
   "default":
   {
     "httpProxy": "http://proxy.server....com:8080",
     "httpsProxy": "https://proxy.server.....com:8080"
   }
 }
}

I hope this will solve your problem.

Upvotes: 3

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