Network Defense Essentials (NDE) Practice Exam

What feature of Kubernetes automatically replaces and reschedules containers that have failing health checks?

1. Load balancing

2. Self-healing

3. Service discovery

4. Resource allocation

The correct answer is: Self-healing

The feature of Kubernetes that automatically replaces and reschedules containers with failing health checks is known as self-healing. This capability is a fundamental aspect of Kubernetes' design, allowing it to maintain the desired state of applications running in a cluster. When a container fails its health checks, Kubernetes identifies the failure and takes corrective actions. This may include restarting the failed container, replacing it entirely, or rescheduling it on a different node if needed. The goal is to ensure that the application remains available and operates smoothly, adhering to the specifications defined in the deployment configuration. The concept of self-healing is critical because it enhances the resilience of applications in cloud environments. It minimizes downtime and the need for manual intervention, allowing developers and system administrators to focus more on building and managing applications rather than constantly monitoring and fixing issues. In contrast, load balancing refers to distributing incoming network traffic across multiple servers to ensure no single server becomes overwhelmed. Service discovery involves enabling services to find and communicate with each other within a network. Resource allocation deals with the management of CPU, memory, and other resources among various applications or containers. These functions, while important, do not directly address the automatic replacement and rescheduling of failing containers as self-healing does.