Blog
Thoughts on engineering, design, and building great products.
File and Directory Operations
The commands you use every day: create, copy, move, rename, delete files and directories, create links, use wildcards to operate in bulk, and find files with find.
The Filesystem and FHS: Everything Is a File
Understand the Linux directory tree under the FHS standard — what each core directory (/etc, /var, /usr, /proc...) is for — and why Linux treats almost everything, including devices and process info, as a file. With a diagram and absolute/relative paths.
Setting Up a Linux Environment and Getting Comfortable with the Shell
Create a Linux environment to practice with using a container, understand the shell and the command prompt, run your first commands, and learn the keyboard shortcuts that make typing commands much faster.
What Is Linux and Why Developers Should Learn It
Series opener: the difference between the Linux kernel and a distro, why nearly every server and container runs Linux, the Unix philosophy behind the command line, and how to use a Linux container as a lab right on your Mac/Windows machine.
What Docker Is and Why You Should Use It
Series opener: what problem Docker solves, how it differs from a virtual machine, the core concepts (image, container, registry), and the learning path from the basics to Docker Swarm.
Docker Architecture: Client, Daemon, containerd and runc
A deep dive into Docker architecture: the client and daemon talk over a REST API, and beneath dockerd sit containerd and runc. Understand what really happens when you type docker run, with diagrams and commands you can verify yourself.
What a Container Is Made Of: Namespaces, Cgroups and Union Filesystem
A deep dive into the lowest layer: three Linux kernel features — namespaces (isolation), cgroups (resource limits) and union filesystem (layers) — turn an ordinary process into a container. With diagrams and commands you can verify yourself.