Earlier when I started on Docker tutorials online, I couldn't understand how different OSs make it possible to run an isolated environment without having a VM.
Later only I understood that Docker is designed for Linux and uses a kernel-level isolation feature that is built into the Linux OS. And when installing Docker in Windows or Mac, they are running Docker inside a Linux OS that is running on a VM inside that Windows/Mac computer.
I really like every Docker tutorial to include the line clearly saying that "A Container is all about filesystem/resources isolation, which is a system-level feature built-into Linux, and Docker is a tool that abstracts this feature."
Correct. From Wikipedia: "Docker on macOS uses a Linux virtual machine to run the containers. It is also possible to run those on Windows using Hyper-V or docker-machine."
Windows has two types of containers — Windows Server Containers and Hyper-V Isolation — in which Hyper-V is a VM. More details are here - docs.microsoft.com/en-us/virtualiz...
I understand that production servers are running on Linux machines.
Earlier when I started on Docker tutorials online, I couldn't understand how different OSs make it possible to run an isolated environment without having a VM.
Later only I understood that Docker is designed for Linux and uses a kernel-level isolation feature that is built into the Linux OS. And when installing Docker in Windows or Mac, they are running Docker inside a Linux OS that is running on a VM inside that Windows/Mac computer.
I really like every Docker tutorial to include the line clearly saying that "A Container is all about filesystem/resources isolation, which is a system-level feature built-into Linux, and Docker is a tool that abstracts this feature."
So, if we want to use Docker in Windows or Mac, we will end up using VM technology at the end of the day. Is that correct?
Correct. From Wikipedia: "Docker on macOS uses a Linux virtual machine to run the containers. It is also possible to run those on Windows using Hyper-V or docker-machine."
Windows has two types of containers — Windows Server Containers and Hyper-V Isolation — in which Hyper-V is a VM. More details are here - docs.microsoft.com/en-us/virtualiz...
I understand that production servers are running on Linux machines.
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Note: Microsoft will soon start shipping a full Linux kernel within Windows. This may change how Docker runs in Windows computers. Let's wait and see.