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+---
+title: Digest Pinning
+weight: 80
+---
+
+# Image Digest Pinning
+
+Operator authors have the ability to pin container images by their
+[digest](https://github.com/opencontainers/image-spec/blob/main/descriptor.md) when generating
+bundles. The digest simultaneously acts as a unique identifier for the image as well as a checksum
+for the image contents. Referencing images by digest rather than their tag ensures the operator
+bundle deployment is consistent and reproducible.
+
+## Usage
+
+To generate bundles that reference images by digest, pass the `--use-image-digests` flag to operator-sdk:
+
+```sh
+$ operator-sdk generate bundle --use-image-digests
+```
+
+Operator projects using the `go` and `helm` builders can also set the `USE_IMAGE_DIGESTS` Makefile variable to `true`:
+
+```sh
+$ make bundle USE_IMAGE_DIGESTS=true
+```
+
+## Bundle Image Detection and Resolution
+
+`operator-sdk` resolves image references to digests by analyzing the `ClusterServiceVersion` object
+provided as input. The following fields in the CSV are used to find and resolve image references:
+
+- All containers in the CSV deployments (`spec.install.spec.deployments`).
+- All environment variables prefixed with `RELATED_IMAGE_` and have a valid container image reference.
+
+Each resolved image is rendered into the ouput bundle's `ClusterServiceVersion` as follows:
+
+1. Images referenced by tag are updated to be referenced by image digest SHA.
+2. Each resolved image is also referenced in the `spec.relatedImages` field in the bundle CSV.
+
+The `relatedImages` field is intended for external tools to identify all container images needed to
+deploy your operator and operands. It is not required to bundle or deploy your operator.