Docker
- Containers in Docker are lightweight due to their minimal operating system requirements
- Key things about Docker
- Best practices to reduce the size of Docker image
- Containers need logical isolation to ensure security
- Understanding the components of the Linux operating system and their connection to Docker.
- Docker images are much smaller than virtual machine images, allowing for higher container density on the same host.
- Docker Daemon is the heart of Docker
- Understanding the architecture and life cycle of Docker
- Docker simplifies the process of creating and running applications by eliminating the need for manual steps.
- Docker D1 is the Docker demon that listens and acts upon API requests.
- Docker Registries are platforms to share Docker images
- Docker eliminates the need for manually installing dependencies and configurations on EC2 instances.
- Install Docker using Docker desktop or follow the guide for easy instance
- Issues with Docker demon and permissions
- Setting up Docker image with Ubuntu and work directory
- Building a Docker image with a Python application
- Push Docker image to Docker Hub
- The Docker image is pushed to Docker account and a new repository is created with the tag 'latest'
Containers in Docker are lightweight due to their minimal operating system requirements
- Containers only include application and system dependencies, utilizing the host operating system for other resources
- Virtual machines, on the other hand, have a complete guest operating system, making them heavier in nature
Key things about Docker
- Containers provide isolation with unique operating system features.
- Understanding the Docker architecture, components, and interactions.
Best practices to reduce the size of Docker image
- How containers are lightweight compared to virtual machines
- Containers do not use resources from the kernel when not running
Containers need logical isolation to ensure security
- Containers have minimum system dependencies for isolation
- Containers share resources with the host operating system
Understanding the components of the Linux operating system and their connection to Docker.
- These components, such as file systems, networking stack, system calls, namespaces, and control groups, are part of the kernel.
- Logical isolation can be achieved by utilizing these components from the host operating system.
- Having a solid understanding of containers is crucial for implementing Kubernetes and deploying containers on cloud platforms.
- Ubuntu provides an
official Docker image for use as a container base image.
- The lightweight nature of containers can be demonstrated with the example of the Ubuntu official Docker image.
Docker images are much smaller than virtual machine images, allowing for higher container density on the same host.
- The default Ubuntu Docker image is only 28.16 MB, whereas a Ubuntu virtual machine image can be up to 2.3 GB.
- Dock-
Docker Daemon receives the commands and creates/updates the necessary Docker images and containers
Docker simplifies the process of creating and running applications by eliminating the need for manual steps.
- Docker allows you to package everything needed for your application into a single image that can be downloaded and executed on any platform.
- It reduces complexity by streamlining workflows and automating tasks, replacing the need for multiple manual actions.
Docker D1 is the
Docker demon that listens and acts upon API requests.
- Docker demon is like a service that listens to Docker requests.
- It is the heart of Docker that acts upon your requests.
Docker Registries are platforms to share Docker images
- Registries can be private or public
- Even within private registries, you can create private and public repositories
Docker eliminates the need for manually installing dependencies and configurations on EC2 instances.
- Docker allows easy sharing of applications by sharing Docker images instead of requiring manual installations and setups.
- In this video, the speaker demonstrates the installation process of Docker on an EC2 instance using Ubuntu.
Install Docker using Docker desktop or follow the guide for easy instance
- To install Docker on personal laptop, use Docker desktop or follow the guide
- Verify if Docker is running or not using '
sudo systemctl status Docker'
Issues with Docker demon and permissions
- Docker demon running as root user poses security risks
- Adding user to Docker group and logging back in activates user profile
Setting up Docker image with Ubuntu and work directory
- Getting Ubuntu latest image from Docker Hub
- Setting work directory to /app for executing commands inside the Docker image
Building a Docker image with a Python application
- Copying app.py onto the Docker image and installing Python
- CMD command as the entry point to execute the app.py
Push Docker image to Docker Hub
- Use '
Docker login' command with username and password to log in to Docker Hub
- Use '
Docker push' command followed by image tag to push the image to Docker Hub
Docker Containerzation for Django
The Docker image is pushed to Docker account and a new repository is created with the tag 'latest'
- Docker command 'docker push' is used to push the image
- The image can be pulled locally using the command '
docker pull'
Docker allows running multiple containers on the same virtual machine, depending on the resources used by each container.
Docker Daemon is the heart of Docker
- Start with Docker as it is easy to learn and troubleshoot
- Understand the architecture of Docker and how Docker Daemon functions
Understanding the architecture and life cycle of Docker
- Docker CLI is used as a client to execute Docker commands
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