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Is there any feasible possibility to use https://docs.docker.com/engine/swarm/secrets/ inside Dockerfile during build time (NOT docker-compose specific .yml file)?
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About secrets. In terms of Docker Swarm services, a secret is a blob of data, such as a password, SSH private key, SSL certificate, or another piece of data that should not be transmitted over a network or stored unencrypted in a Dockerfile or in your application's source code.
Docker BuildKit is the next generation container image builder, which helps us to make Docker images more efficient, secure, and faster. It's integrated into the Docker release version v18.06. BuildKit is a part of the Moby project which was developed after learning's and failures to make the image build process -
Although there's no functionality in Docker to have volumes at build-time, you can use multi-stage builds, benefit from Docker caching and save time by copying data from other images - be it multi-stage or tagged ones.
Note: Docker secrets are only available to swarm services, not to standalone containers. To use this feature, consider adapting your container to run as a service with a scale of 1.
The answer is no. Secretes are only available in docker swarm. Swarm doesn't build images and it doesn't accept a Dockerfile.
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