Docker - An introduction

- Introduction
- Docker: Installing, architecture, commands
- Hands on

Transcript

1. 23/11/2016 Docker Workshop - 1st Day Hugo Arraes Henley - hugohenley at id dot uff dot br An Introduction 1
2. whoami ✤ Telecommunications Engineer @ UFF ✤ 7 years of experience with software development ✤ Solutions Architect @ STI-UFF ✤ Master's candidate in Computer Science @ UFF
3. Agenda ✤ Motivation ✤ Introduction ✤ Docker ✤ Installing ✤ Architecture ✤ Commands ✤ Hands on 3
4. Before we start… ✤ Questions: #workshop-docker at Slack ✤ Urgent questions: ask anytime ✤ We will have a break at 15:45~16:00 ✤ Today: 90 slides ✤ Check your cellphones 4
5. Motivation and Target audience ✤ Did you ever spent hours to install and configure a software? ✤ Have you ever heard “Works on my machine?!” from a dev/ ops guy? ✤ Forgot to install a library or linux package in the production environment? ✤ Avoided to release your software’s new cool feature in production in a dark friday night? Hmm…let’s do it next week, I want to sleep tonight. 5
6. Did you recognize yourself in at least one topic in the previous slide? 6
8. “Ok, ok, I’m listening…but what is Docker?” 8
9. Let’s talk about engineering first… 9
19. Docker Server Host OS Hypervisor Guest OS Bin/Libs App A Guest OS Bin/Libs App B Server Host OS Docker Engine Bin/Libs App A Bin/Libs App B VMs Containers 19
20. Containers are faster more portable than VMs! 20
21. Containers are awesome! 21
22. https://12factor.net/ 22
24. The dev/prod avoids you to fix your broken app in production. 24
25. Docker for the rescue! 25
26. Installing $ sudo apt-get update $ sudo apt-get install apt-transport-https ca-certificates $ sudo apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv- keys 58118E89F3A912897C070ADBF76221572C52609D $ echo deb https://apt.dockerproject.org/repo ubuntu-trusty main | sudo tee /etc/apt/sources.list.d/docker.list $ sudo apt-get update $ sudo apt-get install docker-engine $ sudo service docker start 26
27. http://nordicapis.com/api-driven-devops-spotlight-on-docker/ 27
28. Docker Images ✤ Read-only ✤ Used to create containers ✤ Defined by Dockerfiles ✤ ‘docker build’ command to create an image 28
29. Docker Registries ✤ Where you store your images ✤ Ex: DockerHub ✤ There are a lot of images ready to be used on DockerHub! 29
30. Docker Containers ✤ “Instance of an image” ✤ Are self-contained ✤ Can be started, stopped, deleted… ✤ ‘docker run’ command to start running your container 30
32. Let’s use it. 32
33. 33 https://github.com/hugohenley/docker-workshop.git
34. Docker Hub - https://hub.docker.com 34
36. < 0,38 seconds 36
37. < 0,38 seconds 37
38. < 0,38 seconds!!! 38
40. < 0,38 seconds!!!!!! 40
42. MySQL - Containerized docker run --name my-awesome-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:latest 42
43. MySQL - Containerized docker run --name my-awesome-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:latest 43
44. MySQL - Containerized docker run --name my-awesome-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:latest 44
45. MySQL - Containerized docker run --name my-awesome-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:latest 45
46. MySQL - Containerized docker run --name my-awesome-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:latest 46
47. https://hub.docker.com/_/mysql/ 47
48. MySQL - Containerized docker run --name my-awesome-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:latest 48
52. 35 52
53. Let’s learn some commands! 53
54. docker run 54
55. docker ps -a 55
56. -- name 56
57. docker exec Running a background task inside a container Running an interactive command inside a container sudo docker exec -d hugo_container touch /home/workshop.txt sudo docker exec -it hugo_container /bin/bash 57
58. docker stop Stopping the running container sudo docker stop hugo_container sudo docker stop CONTAINER_ID 58
59. -- restart=always Automatically restarting containers sudo docker run - - restart=always - - name hugo_container -d ubuntu sudo docker stop CONTAINER_ID 59
60. inspecting the container inspect command sudo docker inspect hugo_container 60
61. docker rmi Deleting a Docker image sudo docker rmi some_image 61
62. Docker logs docker logs –f c26f6a666d30 62
63. Looks great! How do I create my own image? 63
65. Dockerfile 65 Think about the sequence of steps needed to start your application from scratch Ex: install some ubuntu package, run some command…
66. Dockerfile ✤ FROM ✤ MAINTAINER ✤ RUN ✤ CMD ✤ EXPOSE ✤ ENV ✤ ADD/COPY ✤ VOLUME ✤ WORKDIR ✤ …
67. docker-compose.yml 67
70. Creating your own image 70
71. Creating your own image 71
72. docker build -t tutum/hello-world . docker run -d -p 80 tutum/hello-world 72
73. Nice, docker solved all my problems! 73
74. Wait, docker does not solve all problems! 74
75. “Everything fails, All the Time. ” Werner Vogels, CTO - Amazon AWS 75
76. Are you prepared to fail? 76
77. Be prepared! 77
80. Chaos Monkey 80
81. Chaos Monkey 81
82. Things you need to consider ✤ Container Orchestration ✤ 12factor ✤ Automation ✤ Build, build, deploy, deploy, deploy, scale, scale, repeat, repeat 82
83. If you are not prepared to fail ✤ You will never sleep ✤ Your new-awesome-release can be a disaster ✤ You will do repetitive tasks, daily 83
85. If you are not prepared to fail ✤ You will hate your job ✤ You will be stressed ✤ You will die earlier ✤ Trust me: you don't want a future like this 85
87. “Be prepared to fail.” – Hugo Arraes Henley
88. Some numbers…
89. Some numbers…
90. Some numbers…
91. Players 91
92. Tomorrow ✤ How people really use Docker ✤ What if I have thousands of machines? ✤ What if some hardware stops working ✤ Challenges ✤ Future
93. Thank you, see you tomorrow! 93