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Before diving into how Docker works under the hood, it’s helpful to revisit some fundamentals of Operating Systems. Take popular Linux distributions like Ubuntu, Fedora, CentOS, or openSUSE. What truly distinguishes these systems isn't the core—it’s the layers built on top of it. At the heart of every Linux-based OS lies the Linux Kernel. This kernel acts as the bridge between your hardware and software—handling tasks like memory management, I/O operations, and device control. However, what gives each distribution its personality and functionality is the user-space software that surrounds the kernel. This user-space includes everything from desktop environments and package managers to development tools and custom utilities. For instance, while Ubuntu might use GNOME with apt, Fedora leans on dnf and integrates bleeding-edge features. So in essence, all these distributions share the same core (the Linux kernel) but differ in the software stack layered above it. This concept of shared core and isolated environments is a key inspiration behind how Docker containers work—sharing a common kernel while isolating user-space environments.
Before diving into how Docker works under the hood, it’s helpful to revisit some fundamentals of Operating Systems. Take popular Linux distributions like Ubuntu, Fedora, CentOS, or openSUSE. What truly distinguishes these systems isn't the core—it’s the layers built on top of it.
At the heart of every Linux-based OS lies the Linux Kernel. This kernel acts as the bridge between your hardware and software—handling tasks like memory management, I/O operations, and device control. However, what gives each distribution its personality and functionality is the user-space software that surrounds the kernel.
This user-space includes everything from desktop environments and package managers to development tools and custom utilities. For instance, while Ubuntu might use GNOME with apt, Fedora leans on dnf and integrates bleeding-edge features.
So in essence, all these distributions share the same core (the Linux kernel) but differ in the software stack layered above it. This concept of shared core and isolated environments is a key inspiration behind how Docker containers work—sharing a common kernel while isolating user-space environments.
