How should secrets and environment variables be handled in a CI/CD pipeline for a .NET application?

Secrets and environment variables in pipelines

Explains safe handling of secrets and environment-specific configuration in CI/CD pipelines.

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Secrets should not be committed to the repository or written directly into pipeline YAML. Values like database passwords, API keys, signing keys, and provider tokens should come from a secure secret store or protected pipeline variables. For Azure, Key Vault and managed identity are usually better than copying secrets around. Normal configuration can be environment-specific, but sensitive values need access control and auditability.

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Secret handling, environment config, Key Vault usage, least privilege, pipeline security, and deployment safety.

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Secret handling is a production safety topic. A pipeline that deploys successfully but leaks secrets is not a good pipeline.
Secrets should not be committed to the repository or written directly into pipeline YAML. Values like database passwords, API keys, signing keys, and provider tokens should come from a secure secret store or protected pipeline variables. For Azure, Key Vault and managed identity are usually better than copying secrets around. Normal configuration can be environment-specific, but sensitive values need access control and auditability.
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In a .NET deployment, the artifact should not contain production secrets. The pipeline can deploy the same artifact to staging and production while each environment provides its own configuration and secrets. The trade-off is that secret management adds setup and permissions work, but it prevents accidental exposure in logs, repos, and build artifacts. I also avoid printing environment variables in pipeline logs.

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Putting secrets in appsettings committed to Git.
Echoing secrets in pipeline logs.
Using one shared credential for every environment.
Letting any developer edit production deployment workflows without review.

How should secrets and environment variables be handled in a CI/CD pipeline for a .NET application?

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