Copying files from Docker container to host

ghz 8months ago ⋅ 79 views

I'm thinking of using Docker to build my dependencies on a Continuous Integration (CI) server, so that I don't have to install all the runtimes and libraries on the agents themselves.

To achieve this I would need to copy the build artifacts that are built inside the container back into the host. Is that possible?

Answers

Yes, it's possible to copy build artifacts from inside a Docker container back to the host machine. You can use the docker cp command to accomplish this.

Here's how you can do it:

  1. Build your dependencies inside a Docker container as part of your CI process.

  2. Once the build is complete and the artifacts are generated inside the container, you can copy them back to the host machine using docker cp.

For example, let's say your build artifacts are located in the /app/build directory inside the container, and you want to copy them to the /host/destination directory on the host machine:

docker cp container_id:/app/build /host/destination

Replace container_id with the ID or name of your Docker container.

This command will copy the contents of the /app/build directory from inside the container to the /host/destination directory on the host machine.

Keep in mind:

  • You need to know the location of the build artifacts inside the container.
  • Ensure that the paths are correctly specified in the docker cp command.
  • Make sure the destination directory on the host machine exists and is writable.

By using Docker for building dependencies in your CI process, you can achieve a more consistent and reproducible build environment across different CI agents, without needing to install all dependencies directly on the agents themselves.

#docker