Overview - Troubleshooting DNS Configuration Issue in Dockerfile for Windows-Based Builds

This workaround involves adding the netsh command in the SHELL statement of the Dockerfile. This fix resolves the DNS configuration problem and allows a successful build.

Error:

 Exception calling "DownloadString" with "1" argument(s): "The remote name 
could not be resolved: 'chocolatey.org'"
At line:1 char:322
+ ...  -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('ht ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], ParentContainsErrorRecordE 
   xception
    + FullyQualifiedErrorId : WebException

Solution

To resolve the DNS configuration issue in your Dockerfile, please follow the steps outlined below:

Step 1: Update the Dockerfile
Add the netsh command to your Dockerfile within the SHELL statement, as shown below:

FROM mcr.microsoft.com/dotnet/framework/wcf:4.8
SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'Continue'; $verbosePreference='Continue'; netsh interface ipv4 set dnsserver 17 static address=8.8.8.8 register=primary;"]
RUN powershell Set-ExecutionPolicy Bypass -Scope Process -Force; $env:chocolateyUseWindowsCompression = 'true'; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1')); choco install awscli urlrewrite vcredist-all -y

For example:

Update your CircleCI configuration file (e.g., .circleci/config.yml) with the following content:

version: 2.1

jobs:
  build:
    machine:
      image: windows-server-2019-vs2019:2022.08.1
    resource_class: windows.large
    steps:
      - run: |
          tee Dockerfile \<<EOD
          FROM mcr.microsoft.com/dotnet/framework/wcf:4.8
          SHELL ["powershell", "-Command", "\$ErrorActionPreference = 'Stop'; \$ProgressPreference = 'Continue'; \$verbosePreference='Continue'; netsh interface ipv4 set dnsserver 17 static address=8.8.8.8 register=primary;"]
          RUN powershell Set-ExecutionPolicy Bypass -Scope Process -Force; \$env:chocolateyUseWindowsCompression = 'true'; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1')); choco install awscli urlrewrite vcredist-all -y
          EOD
      - run: docker build .

Conclusion

By incorporating the netsh command within your CircleCI configuration accordingly, you can resolve the DNS configuration issue encountered during Windows-based builds. This fix ensures that your containers build successfully without DNS-related errors.

If you have any further questions or encounter any difficulties during the process, please don't hesitate to reach out to our support team. We are always ready to assist you and ensure a seamless experience with your CircleCI builds.

Additional Resources:

• Dockerfile Reference
• CircleCI Configuration Reference