Where does docker copy files to local files?

Docker is a popular virtualization technology that is widely used to develop, test and deploy applications. In Docker, sometimes it is necessary to copy the files in the container to the host for backup, transmission or further processing. So, where to copy files to local files in Docker? This article will introduce you to the specific steps of copying files in Docker.

1. Use the Docker cp command to copy files

The Docker cp command is a method of copying files provided by Docker. It can copy files or directories in the container to the host. The basic syntax of the Docker cp command is as follows:

docker cp [OPTIONS] CONTAINER:SRC_PATH DEST_PATH
docker cp [OPTIONS] SRC_PATH|- CONTAINER:DEST_PATH

Among them, the OPTIONS part can specify some parameters. For example, you can use the -r parameter to copy the directory, the -p parameter to retain the original permissions of the file, etc. CONTAINER: SRC_PATH represents the file or directory within the container, and DEST_PATH represents the target location on the host. SRC_PATH| - represents the source file or directory on the host, and DEST_PATH represents the target location within the container.

For example, if you want to copy the file /opt/example.txt in the container to /home/user/example.txt on the host, you can use the following command:

docker cp mycontainer:/opt/example.txt /home/user/example.txt

If you want to copy To copy /home/user/example.txt on the host to /opt/example.txt in the container, you can use the following command:

docker cp /home/user/example.txt mycontainer:/opt/example.txt

2. Mapping files in the Docker container to the host

In addition to using the Docker cp command to copy files, you can also access files in the container by mapping the files in the Docker container to the host. After the files in the container are mapped to the host, we can directly access the files in the container on the host. In Docker, file mapping can be achieved using the -v parameter. For example:

docker run -v /host/path:/container/path mycontainer

In this command, /host/path represents the directory on the host, /container/path represents the directory within the container, and mycontainer is the name of the container. This command maps the /host/path directory on the host to the /container/path directory in the container, so that we can access this directory from the host or within the container. Note that the directory here can be specified arbitrarily, as long as the directory on the host exists.

3. Summary

Copying files to local files in Docker is mainly achieved through the Docker cp command and mapping files in the container to the host. The Docker cp command is a simple and fast way to copy files or directories in the container to the host or copy files or directories on the host to the container. Using the -v parameter for file mapping can map the files in the container to the host, making it easier for us to access and process.

In short, the power of Docker is that it provides us with various convenient operation methods. Not only can we conveniently copy files, but we can also conveniently and quickly operate files in the container through file mapping and other methods.

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