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Savosyuk Stanislav "Docker: Not to Be Confused with a Blue Whale"

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Docker is a computer program that performs operating-system-level virtualization known as containerization. It allows independent "containers" to run within a single Linux instance, avoiding the overhead of starting and maintaining virtual machines. Docker consists of images, registries, and containers. It works by downloading an image, creating a container, initializing the file system and network, setting up the IP address, and starting the specified process.

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www.luxoft.com Docker: Not to Be Confused with a Blue Whale
www.luxoft.com
www.luxoft.com Docker is a computer program that performs operating-system-level virtualization also known as containerization. It is developed by Docker, Inc. Docker is primarily developed for Linux, where it uses the resource isolation features of the Linux kernel such as cgroups and kernel namespaces, and a union-capable file system such as OverlayFS and others to allow independent "containers" to run within a single Linux instance, avoiding the overhead of starting and maintaining virtual machines (VMs). © Wikipedia
www.luxoft.com
www.luxoft.com Why can I use a docker? • Fast and simple deployment • Lightweight • Docker Compose
www.luxoft.com Docker consists • Images • Registries • Containers
www.luxoft.com How it works $ docker run -it ubuntu /bin/bash Parameters Command Image Command to be run after container starts 1. Download image 2. Create container 3. Initialize File System 4. Initialize LAN 5. Setup IP address 6. Start process
www.luxoft.com DockerFile FROM java:8-jre ADD ./build/libs/service-gateway.jar /app/ CMD ["java", "-Xmx200m", "-jar", "/app/service-gateway.jar"] EXPOSE 8080
www.luxoft.com BUILD • Build an image from the Dockerfile in the current directory and tag the image docker build -t myapp:1.0 . • List all images that are locally stored with the Docker engine docker images • Delete an image from the local image store docker rmi alpine:3.4
www.luxoft.com SHIP • Pull an image from a registry docker pull alpine:3.4 • Retag a local image with a new image name and tag docker tag alpine:3.4 myrepo/myalpine:3.4 • Log in to a registry (the Docker Hub by default) docker login my.registry.com:8000 • Push an image to a registry docker push myrepo/myalpine:3.4
www.luxoft.com RUN • docker run • --rm remove container automatically after it exits • -it connect the container to terminal • --name web name the container • -p 5000:80 expose port 5000 externally and map to port 80 • -v ~/dev:/code create a host mapped volume inside the container • alpine:3.4 the image from which the container is instantiated • /bin/sh the command to run inside the container
www.luxoft.com RUN • Stop a running container through SIGTERM docker stop web • Stop a running container through SIGKILL docker kill web • List the running containers docker ps • Delete all running and stopped containers docker rm -f $(docker ps -aq)
www.luxoft.com
www.luxoft.com Config Discovery Backend
www.luxoft.com Thank You! Github - https://github.com/savosyuk Mail - ssavosyuk@luxoft.com
www.luxoft.com Questions

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Savosyuk Stanislav "Docker: Not to Be Confused with a Blue Whale"

  • 1. www.luxoft.com Docker: Not to Be Confused with a Blue Whale
  • 3. www.luxoft.com Docker is a computer program that performs operating-system-level virtualization also known as containerization. It is developed by Docker, Inc. Docker is primarily developed for Linux, where it uses the resource isolation features of the Linux kernel such as cgroups and kernel namespaces, and a union-capable file system such as OverlayFS and others to allow independent "containers" to run within a single Linux instance, avoiding the overhead of starting and maintaining virtual machines (VMs). © Wikipedia
  • 5. www.luxoft.com Why can I use a docker? • Fast and simple deployment • Lightweight • Docker Compose
  • 7. www.luxoft.com How it works $ docker run -it ubuntu /bin/bash Parameters Command Image Command to be run after container starts 1. Download image 2. Create container 3. Initialize File System 4. Initialize LAN 5. Setup IP address 6. Start process
  • 8. www.luxoft.com DockerFile FROM java:8-jre ADD ./build/libs/service-gateway.jar /app/ CMD ["java", "-Xmx200m", "-jar", "/app/service-gateway.jar"] EXPOSE 8080
  • 9. www.luxoft.com BUILD • Build an image from the Dockerfile in the current directory and tag the image docker build -t myapp:1.0 . • List all images that are locally stored with the Docker engine docker images • Delete an image from the local image store docker rmi alpine:3.4
  • 10. www.luxoft.com SHIP • Pull an image from a registry docker pull alpine:3.4 • Retag a local image with a new image name and tag docker tag alpine:3.4 myrepo/myalpine:3.4 • Log in to a registry (the Docker Hub by default) docker login my.registry.com:8000 • Push an image to a registry docker push myrepo/myalpine:3.4
  • 11. www.luxoft.com RUN • docker run • --rm remove container automatically after it exits • -it connect the container to terminal • --name web name the container • -p 5000:80 expose port 5000 externally and map to port 80 • -v ~/dev:/code create a host mapped volume inside the container • alpine:3.4 the image from which the container is instantiated • /bin/sh the command to run inside the container
  • 12. www.luxoft.com RUN • Stop a running container through SIGTERM docker stop web • Stop a running container through SIGKILL docker kill web • List the running containers docker ps • Delete all running and stopped containers docker rm -f $(docker ps -aq)
  • 15. www.luxoft.com Thank You! Github - https://github.com/savosyuk Mail - ssavosyuk@luxoft.com