Docker is a platform that allows users to build, ship, and run applications by using containers. It solves issues like dependency conflicts, portability, and consistency across development and production. Docker uses containers- isolated environments that package code and dependencies together- to deliver software quickly and reliably. Key Docker concepts include images (read-only templates for creating containers), volumes (for persistent data), registries (for sharing images), and compose files (for defining multi-container apps). Docker also provides networking and clustering functionality to connect containers across multiple hosts.

1. Docker in Real Life
Presented by Nguyen Van Vuong
Framgia - Div 3 - Group 4

2. Index
● What is Docker?
● What problems does Docker solve?
● Understanding Docker
● Docker Image/Volumes
● Docker Registry
● ↢ Practice ↣
● Docker Network
● Native Clustering
● Docker Compose
● ↢ Practice ↣
● References
2

3. Welcome to Docker
3

4. What is Docker?
- A platform that allows you to “build, ship, and
run any app, anywhere.”
- Docker is
- A command-line program
- A background daemon
- Set of remote services
It accomplishes this using a UNIX technology
called containers.
4

5. What is Docker?
- History of Docker
Author: Solomon Hykes
Released: March 2013
Main contributors:
❖ The Docker team
❖ Cisco, Huawei, Red Hat
❖ Google, IBM, Microsoft
5

6. What is Docker?
- Docker is a container engine
6

7. What is Docker?
- Software delivery before and after Docker
7

8. What is Docker?
- Software delivery before and after Docker
8

9. What is Docker?
- Docker vs Virtual Machine
9

10. What is Docker?
“Everything at Google, from Search to Gmail,
is packaged and run in a Linux container.”
Eric Brewer, VP of Google Infrastructure
10

11. What is Docker?
- Docker Survey, 2016 (1)
11

12. What is Docker?
- Docker Survey, 2016 (2)
12

13. What is Docker?
- Docker Survey, 2016 (3)
13

14. What is Docker?
- Docker Survey, 2016 (4)
14

15. What problems does Docker solve?
- What happens:
- One application needs an upgraded
dependency but the other does not?
- You remove an application? Is it really gone?
- Can you remove old dependencies?
- Can you remember all the changes you had to
make to install the software you now want to
remove?
15

16. What problems does Docker solve?
- Dependency relationships of example program
- Programs running inside containers with copies of their
dependencies
16

17. What problems does Docker solve?
- Quickly experiment with software
Docker can give you a sandbox environment in milliseconds
17

18. What problems does Docker solve?
- Improving portability
18

19. What problems does Docker solve?
- Protecting your machine
19
vs

20. What problems does Docker solve?
- CI/CD: Every change is automatically deployed
20

21. What problems does Docker solve?
“Each week we launch more than 2 billion container
instances across our global data centers, ... ”
Eric Brewer, VP of Google Infrastructure
21
“At Instagram, we deploy our backend code 30–50 times a
day… whenever engineers commit changes to master… with no
human involvement in most cases.”
Michael Gorven, Production Engineer at Facebook

22. Understanding Docker
22

23. Understanding Docker
- Overview of Docker architecture
23

24. Understanding Docker
- Overview of Docker architecture
- The Docker daemon is the hub of your interactions with
Docker
- Try to curl post/get unix-socket
24

25. Understanding Docker
- Docker running containers on a basic Linux
computer system
25

26. Understanding Docker
- Docker key concepts
26

27. Understanding Docker
- Container state and dependencies
27

28. Understanding Docker
- Isolated environments (containers)
- PID namespace
- UTS namespace
- MNT namespace
- IPC namespace
- NET namespace
- USR namespace
- chroot()
- cgroups
28

29. Docker Image/Volumes
- Image and Container
29

30. Docker Image/Volumes
- Ways to create a new Docker image
- Docker command “By Hand”
- Create a new image with docker commit
- Dockerfile
- Text file with a series of commands
- Dockerfile and configuration management (CM) tool
- Building images with Chef Solo/Ansible
- Scratch image and import a set of files
- Converting your VM to a container
30

31. Docker Image/Volumes
- Writing a Dockerfile
- A Dockerfile is a text file with a series of commands in it
- Docker Instructions
31

32. Docker Image/Volumes
- What is Volumes
- A volume is a mount point on the container’s directory
tree where a portion of the host directory tree has been
mounted.
32

33. Docker Image/Volumes
- Volumes provide container-independent data
management
- Create modularity for architectural components.
- Inject behavior into containers without modifying an
image.
33

34. Docker Image/Volumes
- Volume types
- Bind mount volume
- Managed volume
- Volume can be sharing between containers
34

35. Docker Registry
- Once you’ve created your images, you may want
to share them with other users.
35

36. Docker Registry
- Docker registry
- Private network
- Public network
- Allow
- Multiple users to push
and pull images from
a central store using a
RESTful API.
- Open source
- https://github.com/docker/distribution
36

37. Docker Registry
- Repository
37

38. Docker Registry
- Docker Hub
- A registry maintained by Docker, Inc
- Tens of thousands of images ready to download and run
- Free for public repositories (images)
- Paid for private repositories (images)
38

39. Docker Registry
- Docker Hub
- https://hub.docker.com
- Automated build
- Support Webhook
39

40. Docker Registry
- Gitlab Container Registry
40

41. Docker Registry
- Quay.io Registry
41

42. Time for action
42

43. Docker Network
- Docker container networking
- Single-host
- Multi-host
43
The local Docker network topology

44. Docker Network
- Networks on single-host
- bridge (default)
- none
- host
44

45. Docker Network
- Exposing and publishing ports
- Exposing ports is a way of documenting which ports are
used, but does not actually map or open any ports
- Publishing port tells Docker which ports to open on the
container’s network interface and mapped to an available
port on the host machine
- Links
- Allow a container to resolve another container’s name to
an IP address
45

46. Native Clustering
- What is a node?
- An instance of the Docker engine participating in the
swarm
- Types of node
- Manager node
- Worker node
- Services and tasks
- Replicated services
- Global services
- Load balancing
46

47. Native Clustering
- Docker swarm
47

48. Native Clustering
- RancherOS
48

49. Native Clustering
- CoreOS - Tectonic
49

50. Docker Compose
- Monolithic vs Microservices Architecture
50

51. Docker Compose
- Microservices
- Deployability
- Reliability
- Availability
- Scalability
- Modifiability
- Management
- Design autonomy
51

52. Docker Compose
- Docker Compose
- A tool for defining and running multi-container Docker
applications
- Great for development, testing, and staging environments
- 3 steps to use Docker Compose
- Define your app’s environment with a Dockerfile
- Define the services in docker-compose.yml
- Run docker-compose up
52

53. Docker Compose
- Get started
- Build application count the number of hits the site
- Python/Flask + Redis
53

54. Docker Compose
- Scaling out our app
- Swarm mode
54

55. Time for action
55

56. References
- https://github.com/euclid1990/docker-in-real-life
- https://docs.docker.com
- https://engineering.instagram.com/continuous-deployment-at-instagram-1e18548f0
1d1
- https://cloudplatform.googleblog.com/2014/06/an-update-on-container-support-on
-google-cloud-platform.html
- http://www.informationweek.com/cloud/infrastructure-as-a-service/google-docker-
does-containers-right/d/d-id/1319146
- http://www.vermasachin.com/posts/7-running-docker-mac
- https://sreeninet.wordpress.com/2015/05/31/docker-swarm
- https://www.slideshare.net/ramitsurana/introducing-docker-swarm-the-orchestrati
on-tool-by-docker
- https://docs.gitlab.com/ce/administration/container_registry.html
- https://www.penflip.com/akira.ohio/appcatalyst-hands-on-lab-en
56

57. References
57

58. Thank for listening
58