Kubernetes security contexts are essential for enhancing the security of clusters by controlling access and behavior of pods and containers, which are the core resources in Kubernetes workloads. By default, pods have root access, posing significant risks like unauthorized host file system access, but security contexts help mitigate these risks by defining user permissions and access controls. This article elaborates on applying security contexts at both pod and container levels, demonstrating how to implement them to limit permissions and prevent privilege escalation, thereby securing the cluster's resources. It also highlights the importance of correct security configurations to avoid the dangers of default or misconfigured setups and suggests exploring tools like Earthly for further optimizing Kubernetes and CI/CD pipeline security and efficiency.