How to check where the files in docker are

As Docker is used more and more widely, sometimes it is necessary to view the location and content of some files inside the Docker container. However, due to the nature of Docker, containers isolate data and file systems, so finding files inside the container can be tricky. This article will introduce several methods to view the file location and content inside a Docker container.

1. Using the Docker command line

First, try using the Docker command line to find the file inside the container. You can use the docker exec command to enter the bash shell of a Docker container so you can run commands just like you would on any other Linux server.

1.1 Enter the container

Use the following command to enter the container:

docker exec -it  bash

Where, is the ID of the Docker container. Here we will enter a Docker container named "my_container":

docker exec -it my_container bash

1.2 Find files

Use any command inside the container to find files. For example, to find a file named "example.txt", you can run the following command:

find / -name example.txt

This will search the entire file system for a file named "example.txt". If the file exists, it displays the full path to the file. If the file does not exist, it will say "no such file or directory".

2. Using Docker volumes

Another way to view the files inside a Docker container is to use Docker volumes. Volumes are a feature in Docker that can map the host's directory to the container's directory. Volumes make it easy to share data between hosts and containers.

2.1 Create a Volume

You can create a Volume using the following command:

docker volume create my_volume

This will create a Docker Volume named "my_volume".

2.2 Mount the Volume to the container

Run the following command to mount the Volume into the Docker container:

docker run -it -v my_volume:/my_directory 

Where, is the Docker image to be run The name. Here we mount the Volume into a Docker container named "my_container".

Note: /my_directory is the path within the container that needs to access the Volume, and it will be automatically created in the container.

2.3 Enter the container

Like the first method, use the docker exec command to enter the container:

docker exec -it my_container bash

Now, enter the mount point just created inside the container:

cd /my_directory

Now, you can view files in the Volume, edit files, and more, just like on the host computer. If the container is restarted, the Volume will still retain the data, allowing you to dig deeper into the files within it.

Summary

Finding files inside a Docker container may require some special techniques, but this article introduces two classic methods for finding files in a Docker container. First, you can use the Docker command line to find files inside the container. Second, you can use Docker volumes to map files into directories to easily share data between the host and containers.

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