Deep dives into DevOps and server-side topics, combining theory with hands-on examples. Run every command in an attached remote playground, from your browser or local terminal over SSH — no setup required.
Tutorials contributed by the community members sharing their knowledge and expertise.
This tutorial will help you configure your rootless podman instance to pull from only from specific registries, using different OCI runtimes as well as configure all containers to have specific attributes all without any daemon restarts or sudo calls.
Discover how Go functions under the hood as a modern systems programming language. Learn how Go makes system calls directly, resulting in self-contained binaries that have no libc dependencies.
Learn how you can control multiple podman instances on remote machines without SSHing into them manually. Also learn to deploy your Compose application stacks without SCP / SSH with podman remote feature and Docker Compose v2
Explore what a program is, when it actually becomes a process and how the Linux scheduler manages process execution.
Explore what a thread actually is in Linux, how threads relate to processes, how the Linux kernel treats both as tasks (task_struct), and how kernel scheduling enables concurrency.
Explore Linux/Unix signals in Go, how signals act as asynchronous notifications, who can send them, default kernel behaviors, sending signals with kill and Go, graceful signal handling with os/signal, and why SIGKILL cannot be trapped.
Explore what a computer, CPU architecture, and kernel are, learn the history and family of Assembly ISAs, compare CISC vs RISC, and write your first x86_64 assembly "Hello, World!" program.
Walk through the C compilation pipeline: preprocessor, compiler, assembler, and linker. Start with a normal hello world, inspect macros and generated assembly, and end by producing a running binary that has no main() function.
Learn how to manage Podman containers using systemd on your host machine.
Learn how to use systemd inside containers and manage their lifecycle with podman.
Understand how podman works with configured Linux User Namespaces and how to configure / update these namespaces for current users.
Take a stock Debian SSH server and harden it the way you would in production: replace passwords with public-key auth, disable root login, add a TOTP second factor with PAM, and move off port 22, then prove it works by logging in, all inside the playground.
Learn what a unikernel is and how it compares to a Linux container. Build and run your first unikernel inside a playground box.
