Kubernetes Online Training | Docker Online Training (1)

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What is the Docker Daemon?
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Introduction

• Docker has revolutionized the way developers
  build, ship, and run applications by leveraging
  containerization technology.
• At the core of Dockers functionality is the
  Docker daemon, a background service that plays a
  pivotal role in managing containers, images,
  networks, and volumes.

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What Is the Docker Daemon?

• The Docker daemon, commonly referred to as
  dockerd, is a background service that runs on a
  host machine and is responsible for all the heavy
  lifting associated with container management. The
  daemon listens for Docker API requests and
  performs actions such as creating, running, and
  monitoring containers.

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Container Management

• One of the primary functions of the Docker daemon
  is to manage containers. A container is an
  isolated environment where applications run, and
  it is the fundamental unit of deployment in
  Docker.
• The daemon handles the creation, starting,
  stopping, and deletion of containers. It also
  manages the lifecycle of containers, ensuring
  they run in isolated environments with the
  resources they need.

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Image Management

• Docker images are the building blocks of
  containers. They are read-only templates that
  include the application code, runtime, libraries,
  and dependencies required to run an application.
• The Docker daemon is responsible for managing
  these images, including pulling images from
  Docker Hub or other registries, building new
  images from Dockerfiles, and removing unused
  images to free up space.

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Networking

• Containers often need to communicate with each
  other or with external networks. The Docker
  daemon manages the networking aspects of
  containers, ensuring that they are properly
  connected to networks, whether those are bridge
  networks, overlay networks, or host networks.
• The daemon handles the creation of network
  interfaces, assignment of IP addresses, and the
  routing of traffic between containers and
  external endpoints.

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Conclusion

• The Docker daemon is the heartbeat of Docker,
  orchestrating the entire container lifecycle from
  creation to management, networking, and storage.
  Understanding how the Docker daemon works and how
  it interacts with other components is essential
  for anyone looking to leverage Docker for
  containerization.

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CONTACT
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THANK YOU
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