How to upload files to Docker (steps)

Docker is a popular containerization platform that can be used to simplify the deployment and maintenance of applications. In Docker, uploading files is a very common task. This article will introduce how to upload files to Docker.

Step One: Create a Docker Image

First, you need to create a Docker image that can upload files. To do this you need to use a small Dockerfile. Create a file namedDockerfileand copy the following content into it:

FROM ubuntu:latest RUN apt-get update && apt-get install -y \ curl \ wget \ zip \ unzip \ vim \ && rm -rf /var/lib/apt/lists/* WORKDIR /data

This Dockerfile uses the latest version of the Ubuntu image as the base image and installs several common tools in it.

Next, use the following command to build the Docker image:

docker build -t mydockertest .

This command specifies the name of the image to be built asmydockertest, and looks for the Dockerfile in the current directory.

Step 2: Start the Docker container

To start a Docker container from your Docker image, you can use the following command:

docker run -v <本地文件夹路径>:<容器文件夹路径> -it mydockertest /bin/bash

This will start a new container, and Connect it to the current terminal session. The-voption is used to mount a local folder into a Docker container and enable file sharing between the two folders. For example, you can set the local folder path to/home/user/dataand the container folder path to/data.

Step Three: Upload Files to Docker Container

Now you can upload files by copying local files into the container folder. Execute the following command in the Docker container:

cp /<本地文件夹路径>/<文件名> /<容器文件夹路径>/

This will copy the specified file from the local to the Docker container.

Another method is to use thecurlorwgetcommand to download the file from the URL and save it into the Docker container. For example, you can download a file namedhello.txtusing the following command:

curl -o /<容器文件夹路径>/hello.txt http://example.com/hello.txt

A similar method can be used to download the file usingwget.

Step 4: Exit the Docker container

After uploading the file, you should exit the Docker container and close it. You can exit a Docker container using the following command:

exit

This will return you to the host’s shell prompt.

Step 5: Save changes

If the changes you made to the container are permanent, then you need to save these changes to the new Docker image. To do this, you can use the following command:

docker commit <容器ID> mydockertest2

This will create a new Docker image with the changes you made. The image name ismydockertest2.

Step 6: Test the uploaded file

Finally, you can test the uploaded file by starting a new Docker container and checking whether the file was successfully uploaded into it. Start a new Docker container using the following command:

docker run -v <本地文件夹路径>:<容器文件夹路径> -it mydockertest2 /bin/bash

Use thelscommand to check if the uploaded file exists in the container folder. If everything is fine, you should see the file you just uploaded.

Summary

In this article, we introduced how to upload files to Docker. This is a simple process that can be completed in a few simple steps. Uploading files is probably one of the tasks you perform frequently in Docker, so it's important to master this process.

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