How to use DCT to verify an Image
Prerequisite :- Docker must be installed in your system.
Step 1: Firstly you need to enable the DCT
- you can use this command to enable DCT
export "DOCKER_CONTENT_TRUST=1"
Step 2: Create and set up DCT keys
- you need to create a key and
- then set up it for your image
This is the following Command
docker trust signer add --key <"Key">/ <repository>
Step 3: Push your images to Registry
- now in this step you push your image to a Docker registry
- using docker hub after that you need to signed the image
- and then push the image to registry.
You can use the following Command.
docker image push <registry>/<image>
Step 4: Verify the signed Image
- Now you can inspect the image.
- so you can confirm that the image is successfully signed
you can use various command for, example
docker trust inspect --pretty <image-name>
for more detailed explanation you can go through How to use DCT.
What Is Docker Trust Content ?
When we are using Docker images, we must think about whether the image we are using is trustworthy or not, because trust is a central concern in every field. especially when we download external resources from our local system. In this scenario, Docker comes up with a special security feature called Docker Content Trust (DCT).
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