How to check whether the current virtual machine is Docker?

Docker is a popular containerization platform that allows you to easily package, deliver and run applications, making operation and maintenance tasks simpler. Docker containers are portable, so the same container can be run on a variety of different types of hosts, which is one of the powerful features Docker provides.

In Docker, a container is basically an isolated process that is isolated using one of the supported Linux kernel features (such as namespaces, control groups, etc.). Docker also builds containers using images, which are lightweight executable packages that contain all the code and dependencies needed to run the container.

How to check whether the current virtual machine is Docker?

If you want to know whether the current virtual machine is Docker, please follow these steps:

1. Open a terminal or shell.

2. Enter the following command:

uname -a

3. After executing this command, you will see the output, which will display information about the operating system you are running. details. In the output, you should see kernel version information. In Docker containers, the kernel version is usually expressed in the form "3.x.x". If you see a kernel version like this, your virtual machine is probably a Docker container.

4. If you want to know more about whether it is in the Docker container, please enter the following command:

cat /proc/1/cgroup

This command will display the previous Something that starts with some numbers. If you see the "/docker/" field, it means you are running a Docker container. For example:

8:cpu:/docker/1234b4e4e4c4
7:cpuset:/docker/1234b4e4e4c4
6:blkio:/docker/1234b4e4e4c4
5:memory:/docker/1234b4e4e4c4
4:devices:/docker/1234b4e4e4c4
3:hugetlb:/docker/1234b4e4e4c4
2:perf_event:/docker/1234b4e4e4c4
1:name=systemd:/docker/1234b4e4e4c4

In the above example, you can see the "/docker/" field, which means you are running a Docker container.

Summary

Docker is a very powerful containerization platform that can reduce operation and maintenance burdens. In order to check whether the current virtual machine is a Docker container, you can execute the two commands above, which will tell you the kernel version and Cgroup information, allowing you to determine whether the current virtual machine is a Docker container.

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