Docker and Kubernetes Training

  As  containerization  becomes the foundation for scalable and portable applications, monitoring Docker containers is no longer optional—it's essential. Unlike traditional applications, containers are ephemeral and lightweight, making them more difficult to track without proper visibility tools and techniques. Ensuring optimal performance requires continuous monitoring to detect bottlenecks, identify resource issues, and maintain reliability across dynamic environments. This article explores the key aspects of monitoring Docker container performance, focusing on essential metrics, tools, and best practices, without diving into technical configurations or code.  Docker and Kubernetes Training Understanding Container Monitoring At its core, Docker container monitoring is the process of observing the runtime behavior of containers to ensure they are functioning as expected. Since containers share the host’s kernel but operate in isolated environments, conventional moni...

  The  Privileged and Non-Privileged Containers   world of containerization, security, and access control  is  a crucial  concern . While containers offer a lightweight and flexible alternative to traditional virtualization, their configuration can dramatically impact system security. One of the key distinctions in container security lies in the choice between privileged and non-privileged containers. Understanding this difference is essential for system administrators, developers, and DevOps professionals who aim to balance performance, flexibility, and security in their environments. What Are Privileged Containers? A privileged container is one that runs with extended permissions. When a container is started in privileged mode, it is granted access to all the devices on the host and operates almost like a virtual machine with root access to the host system. This level of access allows the container to perform a wide range of operations that are typically ...

  When working with  Docker , managing data effectively is just as important as managing containers. Docker offers two primary options for persisting and sharing data:  bind mounts  and  volumes . While both are used to connect the host system with containers, they serve different purposes and are optimized for different scenarios. To truly understand their roles, you need to look at how they behave, how they're managed, and when to choose one over the other.  Docker Kubernetes Online Course What is a Bind Mount? A  bind mount  is the simplest form of data storage in Docker. It connects a specific directory or file on your host system to a location inside the container. When you use a bind mount, Docker doesn't control the content or the structure of the mounted directory. Instead, it simply "binds" the specified host path to the container path. Think of a bind mount like plugging an external hard drive into a computer. The data already exists on ...

In Docker, CMD and ENTRYPOINT are two instructions used to specify the command executed when a Docker container starts. Although they might seem similar, they serve different purposes, and understanding the difference between them is crucial for effectively working with Docker containers. CMD: The Default Command CMD in a Dockerfile defines the default command to run when the container is started. If no other command is specified at runtime, Docker will use the command defined in CMD . However, it is important to note that CMD can be overridden by specifying a command directly when running the container using docker run . Docker Kubernetes Online Course There are three forms of CMD : CMD ["executable", "param1", "param2"] (exec form) CMD ["param1", "param2"] (as arguments to the entry point) CMD command param1 param2 (shell form) The first form ( CMD ["executable", "param1", "pa...