Linux Processes: From a Program to a Process
by Başar Subaşı
Explore what a program is, when it actually becomes a process and how the Linux scheduler manages process execution.
Explore the Catalog
Tutorials, challenges, courses, skill paths, playgrounds, and more — search the whole library in one place.
Linux Processes: Threads & Concurrency
by Başar Subaşı
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.
Challenge on Kubernetes
Node Is Ready, but Pods Won't Schedule
by Omkar Shelke
node-02 is back from a kernel upgrade but still shows Ready,SchedulingDisabled, and the Pods that can only run on it are stuck in Pending. Bring the node back into service and get the workload running, without touching the workload itself.
Challenge on Kubernetes
Split a Deployment Evenly Across Two Zones
by Omkar Shelke
A storefront needs eight replicas, and the platform team wants them split down the middle between the two availability zones. An uneven split must be refused by the scheduler rather than quietly tolerated.
Challenge on Kubernetes
Create and Assign a Custom PriorityClass to a Workload
by Omkar Shelke
Create a PriorityClass for production workloads and patch an existing deployment to use it, ensuring critical services get scheduled first during resource contention.
Challenge on Kubernetes
Place One Pod per Node Without Using a DaemonSet
by Omkar Shelke
Deploy a multi-container Kubernetes Deployment and ensure that no more than one Pod runs on the same worker node, without using a DaemonSet.
Explore Kubernetes Pod Scheduling
Nine hands-on challenges split into two sections. The resource section covers how requests, QoS classes, priority, and namespace quotas shape scheduling decisions. The placement section covers how affinity, topology spread, and dedicated nodes control where pods land. HPA closes the path by showing how requests drive autoscaling.