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Docker architecture(version modified)

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Mohammadreza Amini
Mohammadreza Amini

This presentation discusses Docker architecture and components. It is comprised of four main parts: Docker client and daemon, images, registries, and containers. The client communicates with the daemon to execute commands. Images are read-only templates used to create containers, which are lightweight and isolated environments for applications. Registries store images. The presentation explains how Docker works, how it differs from virtual machines and LXC, and the underlying technologies of namespaces, control groups, and union file systems that enable Docker's functionality.

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Presentation By: Mohammadreza Amini Amir Arsalan Autumn 2015 IRAN OpenStack Users Group Docker Architecture Version Modified
Agenda Docker Architecture Version Modified | Iran Community OpenStack.ir ● Docker Concept ● How Does Docker Work? ● Should know about Docker ● Docker vs VMs ● Docker vs lxc ● The underlying technology
Docker Architecture Version Modified | Iran Community OpenStack.ir Docker Concept
Docker is composed of following four components Docker Architecture Version Modified | Iran Community OpenStack.ir ● Docker Client and Daemon ● Images ● registries ● Containers
Docker Client and Daemon Docker Architecture Version Modified | Iran Community OpenStack.ir Docker Daemon the Docker daemon runs on a host machine. The user does not directly interact with the daemon, but instead through the Docker client. Docker Client The Docker client, in the form of the docker binary, is the primary user interface to Docker. It accepts commands from the user and communicates back and forth with a Docker daemon.
Images Docker Architecture Version Modified | Iran Community OpenStack.ir A Docker image is a read-only template. Image type: ● Images that exist on register (docker hub) ● Images that can created with build
Registeries Docker Architecture Version Modified | Iran Community OpenStack.ir Docker registries hold images. These are public or private stores from which you upload or download images. The public Docker registry is provided with the Docker Hub.
Containers Docker Architecture Version Modified | Iran Community OpenStack.ir Docker containers are similar to a directory. A Docker container holds everything that is needed for an application to run. Each container is created from a Docker image.
Docker Architecture Version Modified | Iran Community OpenStack.ir How Does Docker Work?
Docker Architecture Version Modified | Iran Community OpenStack.ir Reference: https://docs.docker.com/article-img/architecture.svg
What happens when you run a container? Docker Architecture Version Modified | Iran Community OpenStack.ir ● Pulls the image ● Creates a new container ● Allocates a filesystem and mounts a read-write layer ● Allocates a network / bridge interface ● Sets up an IP address ● Executes a process that you specify ● Captures and provides application output
Docker Architecture Version Modified | Iran Community OpenStack.ir Should know about Docker
Docker Architecture Version Modified | Iran Community OpenStack.ir ● Docker is not LXC ● Docker is not a Virtual machine Solution. ● Docker is not a configuration management system and is not a replacement for chef, puppet, Ansible etc. ● Docker is not a platform as a service technology. Things you should know about Docker:
Docker Architecture Version Modified | Iran Community OpenStack.ir Docker vs VMs
Docker Architecture Version Modified | Iran Community OpenStack.ir Reference: https://risingstack-blog.s3-eu-west-1.amazonaws.com/2015/05/hypervisor-based-virtualization.jpg
Docker Architecture Version Modified | Iran Community OpenStack.ir Reference: https://risingstack-blog.s3-eu-west-1.amazonaws.com/2015/05/os-virtualization.jpg
Docker Architecture Version Modified | Iran Community OpenStack.ir Docker vs lxc
Docker Architecture Version Modified | Iran Community OpenStack.ir Reference: https://www.flockport.com/lxc-vs-docker/
Docker Architecture Version Modified | Iran Community OpenStack.ir The underlying technology
Namespaces Docker Architecture Version Modified | Iran Community OpenStack.ir Namespaces provides a layer of isolation: each aspect of a container runs in its own namespace and does not have access outside it. More Details: http://www.toptal.com/linux/separation-anxiety-isolating-your-system-with-linux-namespaces
Control Groups Docker Architecture Version Modified | Iran Community OpenStack.ir Cgroups running applications in isolation is to have them only use the resources you want. This ensures containers are good multi-tenant citizens on a host. Control groups allow Docker to share available hardware resources to containers and, if required, set up limits and constraints. For example, limiting the memory available to a specific container. More Details: https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt
Union File System Docker Architecture Version Modified | Iran Community OpenStack.ir Union file systems, or UnionFS, are file systems that operate by creating layers, making them very lightweight and fast. Docker uses union file systems to provide the building blocks for containers. More Details: http://www.fsl.cs.sunysb.edu/docs/unionfs-tr/unionfs.pdf
Docker Architecture Version Modified | Iran Community OpenStack.ir Any Question?
Docker Architecture Version Modified | Iran Community OpenStack.ir Stay in Touch and Join Us: ● Home Page: OpenStack.ir ● Meetup age: Meetup.com/IranOpenStack ● Mailing List: OpenStackir@Lists.OpenStack.org ● Twitter: @OpenStackIR , #OpenStackIRAN ● IRC Channel on FreeNode: #OpenStack-ir
Docker Architecture Version Modified | Iran Community OpenStack.ir Mohammadreza Amini Linux Administrator Mohammadreza@openstack.ir Amir Arsalan Python Developer Arsalan@openstack.ir Thank You

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Docker architecture(version modified)

  • 1. Presentation By: Mohammadreza Amini Amir Arsalan Autumn 2015 IRAN OpenStack Users Group Docker Architecture Version Modified
  • 2. Agenda Docker Architecture Version Modified | Iran Community OpenStack.ir ● Docker Concept ● How Does Docker Work? ● Should know about Docker ● Docker vs VMs ● Docker vs lxc ● The underlying technology
  • 3. Docker Architecture Version Modified | Iran Community OpenStack.ir Docker Concept
  • 4. Docker is composed of following four components Docker Architecture Version Modified | Iran Community OpenStack.ir ● Docker Client and Daemon ● Images ● registries ● Containers
  • 5. Docker Client and Daemon Docker Architecture Version Modified | Iran Community OpenStack.ir Docker Daemon the Docker daemon runs on a host machine. The user does not directly interact with the daemon, but instead through the Docker client. Docker Client The Docker client, in the form of the docker binary, is the primary user interface to Docker. It accepts commands from the user and communicates back and forth with a Docker daemon.
  • 6. Images Docker Architecture Version Modified | Iran Community OpenStack.ir A Docker image is a read-only template. Image type: ● Images that exist on register (docker hub) ● Images that can created with build
  • 7. Registeries Docker Architecture Version Modified | Iran Community OpenStack.ir Docker registries hold images. These are public or private stores from which you upload or download images. The public Docker registry is provided with the Docker Hub.
  • 8. Containers Docker Architecture Version Modified | Iran Community OpenStack.ir Docker containers are similar to a directory. A Docker container holds everything that is needed for an application to run. Each container is created from a Docker image.
  • 9. Docker Architecture Version Modified | Iran Community OpenStack.ir How Does Docker Work?
  • 10. Docker Architecture Version Modified | Iran Community OpenStack.ir Reference: https://docs.docker.com/article-img/architecture.svg
  • 11. What happens when you run a container? Docker Architecture Version Modified | Iran Community OpenStack.ir ● Pulls the image ● Creates a new container ● Allocates a filesystem and mounts a read-write layer ● Allocates a network / bridge interface ● Sets up an IP address ● Executes a process that you specify ● Captures and provides application output
  • 12. Docker Architecture Version Modified | Iran Community OpenStack.ir Should know about Docker
  • 13. Docker Architecture Version Modified | Iran Community OpenStack.ir ● Docker is not LXC ● Docker is not a Virtual machine Solution. ● Docker is not a configuration management system and is not a replacement for chef, puppet, Ansible etc. ● Docker is not a platform as a service technology. Things you should know about Docker:
  • 14. Docker Architecture Version Modified | Iran Community OpenStack.ir Docker vs VMs
  • 15. Docker Architecture Version Modified | Iran Community OpenStack.ir Reference: https://risingstack-blog.s3-eu-west-1.amazonaws.com/2015/05/hypervisor-based-virtualization.jpg
  • 16. Docker Architecture Version Modified | Iran Community OpenStack.ir Reference: https://risingstack-blog.s3-eu-west-1.amazonaws.com/2015/05/os-virtualization.jpg
  • 17. Docker Architecture Version Modified | Iran Community OpenStack.ir Docker vs lxc
  • 18. Docker Architecture Version Modified | Iran Community OpenStack.ir Reference: https://www.flockport.com/lxc-vs-docker/
  • 19. Docker Architecture Version Modified | Iran Community OpenStack.ir The underlying technology
  • 20. Namespaces Docker Architecture Version Modified | Iran Community OpenStack.ir Namespaces provides a layer of isolation: each aspect of a container runs in its own namespace and does not have access outside it. More Details: http://www.toptal.com/linux/separation-anxiety-isolating-your-system-with-linux-namespaces
  • 21. Control Groups Docker Architecture Version Modified | Iran Community OpenStack.ir Cgroups running applications in isolation is to have them only use the resources you want. This ensures containers are good multi-tenant citizens on a host. Control groups allow Docker to share available hardware resources to containers and, if required, set up limits and constraints. For example, limiting the memory available to a specific container. More Details: https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt
  • 22. Union File System Docker Architecture Version Modified | Iran Community OpenStack.ir Union file systems, or UnionFS, are file systems that operate by creating layers, making them very lightweight and fast. Docker uses union file systems to provide the building blocks for containers. More Details: http://www.fsl.cs.sunysb.edu/docs/unionfs-tr/unionfs.pdf
  • 23. Docker Architecture Version Modified | Iran Community OpenStack.ir Any Question?
  • 24. Docker Architecture Version Modified | Iran Community OpenStack.ir Stay in Touch and Join Us: ● Home Page: OpenStack.ir ● Meetup age: Meetup.com/IranOpenStack ● Mailing List: OpenStackir@Lists.OpenStack.org ● Twitter: @OpenStackIR , #OpenStackIRAN ● IRC Channel on FreeNode: #OpenStack-ir
  • 25. Docker Architecture Version Modified | Iran Community OpenStack.ir Mohammadreza Amini Linux Administrator Mohammadreza@openstack.ir Amir Arsalan Python Developer Arsalan@openstack.ir Thank You