Docker Introduction

An introductory presentation about Docker and its benefits.

Presented (in some variation) at:
* http://www.meetup.com/Docker-Tel-Aviv/events/174016622/
* http://www.meetup.com/Docker-Tel-Aviv/events/221108613/

Transcript

1. introduction
2. > whoami Evgeny Zislis www.devops.co.il il.linkedin.com/in/evgenyzislis
3. why containers?
4. cargo of cars cargo of stuff deployment manual labor Hand-loading a ship cost $5.86 per ton before 1956.
5. After 1956, using containers, it cost ¢16 per ton to load a ship. Containerization greatly reduced the time to load and unload cargo. Malcom Purcell McLean "A ship earns money only when she is at sea".
6. static website user data web frontend queue analytics development environments qa servers customer data center public cloud production cluster
7. so, why containers? STANDARDIZATION … facilitate commoditization of formerly custom processes and help maximize compatibility, interoperability, safety, repeatability, and quality. - wikipedia
8. _docker_
9. > docker run busybox /bin/echo ‘Hello World!’ Hello World! hello world! image command to run output
10. docker CONTAINERS
11. > docker run --tty --interactive busybox /bin/sh / # exit interactive container keep stdin attached image command to run
12. $ uname -a # show kernel/linux version $ pwd # show current directory $ ls # show files in directory $ whoami # what is my user name $ id # what is my user id $ ps # what processes are running $ hostname # what is the server hostname $ ifconfig # network interface list $ netstat # network activity $ netstat -r # routing table $ mount # mounted file systems inspecting a linux environment
13. > docker run -t -i -e PS1='\u@\h:\w# ' busybox /bin/sh root@abcdef:/# exit > container environment environment variable
14. > docker run -ti busybox \ /bin/sh -c 'while true; do date; sleep 1; done' Sun Mar 23 18:57:17 IST 2015 Sun Mar 23 18:57:18 IST 2015 Sun Mar 23 18:57:19 IST 2015 Sun Mar 23 18:57:20 IST 2015 Sun Mar 23 18:57:21 IST 2015 ^C docker clock
15. > docker run -d busybox \ /bin/sh -c 'while true; do date; sleep 1; done' e04e6a90bd09723fcda724ecd9392434992d7d0fd335bb465cd5f618570ee68e daemon clock! Hey! Where is the REAL output?
16. > docker ps > docker top container_name_or_id > docker logs container_name_or_id > docker stop container_name_or_id > docker start container_name_or_id > docker rm container_name_or_id running containers CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d40ad71102b8 busybox:latest /bin/sh -c 'while tr 2 minutes ago Up 2 minutes berserk_hopper
17. > docker inspect container_name # filtering a single property (using GO text/template) > docker inspect -f '{{ .NetworkSettings.IPAddress }}' cont_name container metadata dvps.me/docker-ws-cheat
18. > docker run -d busybox \ nc -ll -p 80 -e /bin/echo -e "HTTP/1.1 200 OK\n\nHello World.\n" 00ac7444f87e797d1a5e6cdd2eb8f916e7fefddcaa9d751551719fe49e5c9732 > docker inspect `docker ps -ql` | grep IPAddress "IPAddress": "172.17.0.2", > curl http://<ip_address> Hello World. a hello-world web server
19. containers : what we learned so far ✓ running commands in a container ✓ starting interactive containers ✓ namespace separation ✓ containers with daemons ✓ inspecting live containers ✓ container metadata ✓ docker bridge networking
21. people.hofstra.edu/geotrans/eng/ch3en/conc3en/containerships.html
22. en.wikipedia.org/wiki/SS_Ideal_X on April 26, 1956 the Ideal X carried 58 containers from Port Newark, New Jersey, to Port of Houston, Texas, where 58 trucks were waiting to be loaded with the containers.
23. www.worldslargestship.com
24. docker IMAGES
25. > docker run -ti busybox /bin/sh / # cat > bin/server.sh #!/bin/sh PATH=/bin:/usr/bin nc -ll -p 80 -e echo -e "HTTP/1.1 200 OK\n\nI am very FAST!" ^D / # chmod +x bin/server.sh / # exit modifying containers
26. > docker ps --latest > docker diff container_name A /.ash_history C /bin A /bin/server.sh # now run 3 containers with server.sh in parallel ... what changed?
27. container commit > docker commit -a ‘Evgeny Zislis <evgeny@devops.co.il>’ \ abcde123 haws/webserver 96e632d705113241816462ba9c7e94451384a505613dff64af192daf7bc78efb Hey! What is this?
28. > docker images > docker search mongodb > docker pull mongodb/mongodb:latest > docker run -d mongodb/mongodb using images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE busybox latest a9eb17255234 5 days ago 2.433 MB ubuntu 14.04 99ec81b80c55 4 weeks ago 266 MB
29. docker HUB hub.docker.com
30. # server.sh #!/bin/sh PATH=/bin:/usr/bin nc -ll -p 80 -e echo -e "HTTP/1.1 200 OK\n\nI am very FAST!" # Dockerfile FROM busybox:latest ADD server.sh bin/server.sh ENTRYPOINT bin/server.sh > chmod 0750 server.sh && docker build -t haws/webserver . build an image
31. tags for images > docker tag webserverNEW webserver > docker login user: haws pass: verysecret mail: haws@devops.co.il > docker push haws/webserverNEW
32. Dockerfile instructions http://docs.docker.com/reference/builder/ FROM image:tag MAINTAINER Evgeny Zislis <evgeny@devops.co.il> RUN command # runs it in /bin/sh -c ‘command’ RUN [ “exec”, “param”, “param” ] CMD command # or CMD [ “exec”, “param”, “param” ] ENTRYPOINT command # or ENTRYPOINT [ “exec”, “param” ]
33. What is wrong with this Dockerfile? RUN cd /bin RUN rm script.sh Quiz - Dockerfile
34. ENV key value ADD src dst # src is file, archive, or url (http://) COPY src dst USER someone WORKDIR somewhere Dockerfile instructions cont.
35. ✓ commit changed containers ✓ inspect difference made to container ✓ searching for community images ✓ docker image pulling and pushing ✓ building images using Dockerfiles ✓ injecting files into images with ADD images : what we learned so far
37. port of Shanghai how many TEUs it handled in 2014? how many ships handled?
38. port of Shanghai 35.29 million TEU in 2014 busiest container port for the fifth consecutive year. handling more than 50,000 ships annually
39. docker HUB hub.docker.com
40. docs. docker. com /reference
41. docker.com/community
42. blog. docker.com /docker- weekly- archives
43. We invite you to join Operations Israel Facebook group on on.fb.me/Ops-IL link to slides: dvps.me/docker-intro Thank you! www.devops.co.il