Introduction to docker
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Docker is an open platform for developing, shipping, and running applications. It aims to solve the problem of maintaining different application versions across multiple platforms and servers. Docker allows applications to be packaged into standardized units called containers that contain all their dependencies so they can run reliably from one computing environment to another. Containers operate much more efficiently at runtime than virtual machines, using less memory and CPU resources. Docker images provide a lightweight template for creating containers which bundle application code and dependencies. This allows applications to be easily deployed and scaled across multiple machines.
![docker pull
Download image from Docker Hub
docker pull [image]
Ex: docker pull debian](https://image.slidesharecdn.com/introtodocker-140618094335-phpapp02/85/Introduction-to-docker-32-320.jpg)
![docker run (1)
docker run [image] [command]
-i interactive mode
-t pseudo-tty
Ex: docker -i -t run debian /bin/bash](https://image.slidesharecdn.com/introtodocker-140618094335-phpapp02/85/Introduction-to-docker-33-320.jpg)
![docker commit
docker commit [Container ID] [image
name]
docker commit 1c1f5 new_image](https://image.slidesharecdn.com/introtodocker-140618094335-phpapp02/85/Introduction-to-docker-39-320.jpg)
![docker save / load
This packing will preserve the history of a
docker
docker save [Image Name] > [Archive
Name]
docker load < [Archive Name]](https://image.slidesharecdn.com/introtodocker-140618094335-phpapp02/85/Introduction-to-docker-45-320.jpg)
![docker export / import
This way only keep the difference
docker export [Container ID] > [Archive
Name]
cat [Archive Name] | docker import -
[Image Name[:Tag]]](https://image.slidesharecdn.com/introtodocker-140618094335-phpapp02/85/Introduction-to-docker-46-320.jpg)
![docker run (2)
-v [host directory]:[container directory]
Bind mount a volume
-p [host port]:[container port]
Publish a container's port to the host](https://image.slidesharecdn.com/introtodocker-140618094335-phpapp02/85/Introduction-to-docker-48-320.jpg)
![docker build
docker build -t [Image Name[:Tag]]
<path to Dockerfile>
docker build -t my_image:v1 .](https://image.slidesharecdn.com/introtodocker-140618094335-phpapp02/85/Introduction-to-docker-53-320.jpg)
Introduction to docker
- 1. Introduce to
- 2. Outline What is docker? Why docker? Dockerfile
- 3. What is docker? An open platform for developing, shipping, and running applications
- 4. What it want to solve?
- 5. The matrix from hell “You've got all types of servers, all types of different languages and frameworks, and all types of application versions to try and maintain across those platforms” - Ben Golub, CEO of Docker
- 6. The matrix from hell
- 7. We need a container
- 8. The matrix from hell
- 9. The matrix from hell
- 10. Installation
- 11. From ubuntu mainstream Docker goes into Ubuntu mainstream since 14.04 Currently, v0.9 apt-get install docker.io
- 12. From Official Repo The latest version: v1.0 echo deb https://get.docker.io/ubuntu docker main > / etc/apt/sources.list.d/docker.list apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9 apt-get update apt-get install lxc-docker
- 13. Why Docker?
- 14. Fast and less overhead Image versioning Portable
- 15. Fast and less overhead
- 16. VM v.s. Docker
- 17. VM v.s. Docker Server Host OS
- 18. VM v.s. Docker Server Host OS Hypervisor
- 19. VM v.s. Docker Server Host OS VM VM Hypervisor
- 20. VM v.s. Docker Server Host OS VM VM Guest OS Hypervisor
- 21. VM v.s. Docker Server Host OS VM VM Guest OS Hypervisor Dep.
- 22. VM v.s. Docker Server Host OS VM VM Guest OS Hypervisor Dep. App
- 23. VM v.s. Docker Server Host OS VM VM Guest OS Hypervisor Dep. App Server Host OS
- 24. VM v.s. Docker Server Host OS VM VM Guest OS Hypervisor Dep. App Server Host OS Docker Engine
- 25. VM v.s. Docker Server Host OS VM VM Guest OS Hypervisor Dep. App Server Host OS Container Container Docker Engine
- 26. VM v.s. Docker Server Host OS VM VM Guest OS Hypervisor Dep. App Server Host OS Container Container Docker Engine Image1
- 27. VM v.s. Docker Server Host OS VM VM Guest OS Hypervisor Dep. App Server Host OS Container Container Docker Engine Image1 Image2
- 28. VM v.s. Docker Server Host OS VM VM Guest OS Hypervisor Dep. App Server Host OS Container Container Docker Engine Image1 App1 Image2
- 29. VM v.s. Docker Server Host OS VM VM Guest OS Hypervisor Dep. App Server Host OS Container Container Docker Engine Image1 App1 Image2 App2
- 30. VM v.s. Docker Server Host OS VM VM Guest OS Hypervisor Dep. App Server Host OS Container Container Docker Engine Image1 App1 Image2 App2 App3
- 31. Live Demo IP: 10.10.100.108 Username: test Password: 123456
- 32. docker pull Download image from Docker Hub docker pull [image] Ex: docker pull debian
- 33. docker run (1) docker run [image] [command] -i interactive mode -t pseudo-tty Ex: docker -i -t run debian /bin/bash
- 34. Image versioning
- 35. Image v.s. Container Base on LXC and AUFS Images are read-only Read / write on container Files in container won’t keep unless you commit
- 36. Image v.s. Container Base on LXC and AUFS Images are read-only Read and write on container Files in container won’t keep unless you commit
- 37. Image v.s. Container docker pull debian
- 38. Image v.s. Container docker pull debian docker run debian /bin/bash
- 39. docker commit docker commit [Container ID] [image name] docker commit 1c1f5 new_image
- 40. Image v.s. Container docker pull debian docker run debian /bin/bash
- 41. Image v.s. Container docker pull debian docker commit docker commit docker run debian /bin/bash
- 42. Image v.s. Container docker pull debian docker commit docker commit docker run debian /bin/bash
- 43. Portable Runs on all major Linux distributions Boot2docker for Mac and Windows users A ~25 MB tiny VM inside
- 44. Ship your container There are three ways to ship your container: Docker Hub (docker push) docker save docker export
- 45. docker save / load This packing will preserve the history of a docker docker save [Image Name] > [Archive Name] docker load < [Archive Name]
- 46. docker export / import This way only keep the difference docker export [Container ID] > [Archive Name] cat [Archive Name] | docker import - [Image Name[:Tag]]
- 47. Separation of Data and App
- 48. docker run (2) -v [host directory]:[container directory] Bind mount a volume -p [host port]:[container port] Publish a container's port to the host
- 49. Other useful command docker ps docker images docker kill docker rm docker rmi docker logs docker inspect
- 50. Dockerfile
- 52. Example
- 53. docker build docker build -t [Image Name[:Tag]] <path to Dockerfile> docker build -t my_image:v1 .
- 55. Examples
- 56. My Concern Easy to setup over a VM Separate data and application Reproduce my environment fast
- 57. Jenkins Initialize shared volume before service start Use supervisor to manage multiple services
- 58. One-time script
- 59. Can not use upstart
- 60. Use supervisor
- 61. Summarize
- 62. Do one thing at a time Treat a docker container as an app
- 63. Ecosystem CoreOS - Work with SystemD Openstack - An instance type Docker Hub (Docker Index) Many providers - Digital Ocean, EC2, Linode, Google Cloud Platform
- 64. Gotcha Don’t have its /sbin/init (Issue 1024) Share kernel, can not run different Linux Kernel at a time Use --privileged if needed
- 65. Not mentioned Link to another container Use share volume on another container
- 66. Q & A