Docker Workshop

Introduction to Docker workshop
http://www.meetup.com/Docker-Tel-Aviv/events/219060445/

This workshop covers Docker basics. You will progress from introductory hands-on experience using ready containers up to creating custom images, monitoring and troubleshooting interlinked containers. Learn the concepts and terminology used by Docker to describe infrastructure and more. You will leave with the skills and confidence to use Docker in a wide range of settings.

Transcript

1. workshop introduction to docker
2. > whoami Evgeny Zislis www.devops.co.il il.linkedin.com/in/evgenyzislis
3. > git clone https://gist.github.com/dfece549c22ddd3eccad workshop > cd workshop > vagrant up > vagrant ssh > docker --version bootstrap #DB001 cheat sheet dvps.me/docker-ws-cheat Docker version 1.3.3, build d344625
4. why containers?
5. cargo of cars cargo of stuff deployment manual labor Hand-loading a ship cost $5.86 per ton before 1956.
6. 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".
7. static website user data web frontend queue analytics development environments qa servers customer data center public cloud production cluster
8. _docker_
9. > git clone https://gist.github.com/dfece549c22ddd3eccad workshop > cd workshop > vagrant up > vagrant ssh > docker --version bootstrap #DB001 cheat sheet dvps.me/docker-ws-cheat Docker version 1.3.3, build d344625
10. > docker run busybox /bin/echo ‘Hello World!’ Hello World! hello world! #DB002 image command to run output dvps.me/docker-ws-cheat
11. docker CONTAINERS
12. dvps.me/docker-ws-cheat > docker run --tty --interactive busybox /bin/sh / # exit interactive container #DC001 keep stdin attached
13. $ 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 dvps.me/docker-ws-cheat
14. > docker run -t -i -e PS1='\u@\h:\w# ' busybox /bin/sh root@abcdef:/# uname -a root@abcdef:/# pwd root@abcdef:/# ls root@abcdef:/# whoami root@abcdef:/# id root@abcdef:/# ps root@abcdef:/# hostname root@abcdef:/# ifconfig root@abcdef:/# netstat root@abcdef:/# netstat -r root@abcdef:/# mount interactive container environment variable dvps.me/docker-ws-cheat
15. > docker run -ti busybox \ /bin/sh -c 'while true; do date; sleep 1; done' docker being a clock dvps.me/docker-ws-cheat
16. > docker run -d busybox \ /bin/sh -c 'while true; do date; sleep 1; done' e04e6a90bd09723fcda724ecd9392434992d7d0fd335bb465cd5f618570ee68e daemon clock! Hey! Where is the REAL output? dvps.me/docker-ws-cheat
17. > 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 dvps.me/docker-ws-cheat CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d40ad71102b8 busybox:latest /bin/sh -c 'while tr 2 minutes ago Up 2 minutes berserk_hopper
18. > 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
19. > docker run -d busybox \ nc -ll -p 80 -e /bin/echo -e "HTTP/1.1 200 OK\n\nHello World!\n" > docker inspect `docker ps -ql` | grep IPAddress > curl http://<ip_address> a hello-world web server dvps.me/docker-ws-cheat
20. 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. Challenge - containers Start a container that replies with a list of environment variables to http requests. Five names and values, one per line. eg. curl http://container_ip_address/ PWD=/ HOSTNAME=abcadb123 ...
22. > docker run -d busybox \ nc -ll -p 80 -e \ /bin/sh -c \ "/bin/echo -e 'HTTP/1.1 200 OK\n'; /usr/bin/env | head -5" environment-replying web server dvps.me/docker-ws-cheat
24. people.hofstra.edu/geotrans/eng/ch3en/conc3en/containerships.html
25. 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.
26. www.worldslargestship.com
27. # single most important command in docker > docker help # combine single character options : -t -i > docker run -ti # boolean options have defaults when not used : -d=false > docker run -d # multi options can be used more than once : -a=[] > docker run -a stdin -a stdout -a stderr # options with values : --name=”” -c=0 > docker run --name bigbox -c 0 docker cli docs.docker.com/reference/commandline/cli/
28. docker IMAGES
29. > 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 dvps.me/docker-ws-cheat
30. > 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? dvps.me/docker-ws-cheat
31. container commit > docker commit -a ‘Evgeny Zislis <evgeny@devops.co.il>’ \ abcde123 haws/webserver 96e632d705113241816462ba9c7e94451384a505613dff64af192daf7bc78efb Hey! What is this? dvps.me/docker-ws-cheat
32. > 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 dvps.me/docker-ws-cheat
33. docker HUB hub.docker.com
34. # 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 dvps.me/docker-ws-cheat
35. tags for images > docker tag webserver_yourname webserver > docker login user: haws pass: verysecret mail: haws@devops.co.il > docker push haws/webserver_yourname dvps.me/docker-ws-cheat
36. 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” ] dvps.me/docker-ws-cheat
37. What is wrong with this Dockerfile? RUN cd /bin RUN rm script.sh Quiz - Dockerfile
38. ENV key value ADD src dst # src is file, archive, or url (http://) COPY src dst USER someone WORKDIR somewhere Dockerfile instructions cont.
39. ✓ 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
40. Build two images that depend on each other, and, have six degrees of separation when inspected using : > docker images --tree Challenge - images
42. port of Shanghai how many TEUs it handled in 2013?
43. port of Shanghai 33.6 million TEU in 2013 776 million tonnage
44. # exposing container ports in Dockerfile EXPOSE 22 53/udp 514 > docker run -P -p 22:2222 ... # linking containers - environment & /etc/hosts > docker run -P --link name:alias ... # non-unionfs mount volumes VOLUME [“/data”] > docker run -v /data:/data/mongodb ... # from host > docker run --volumes-from dbdata ... # from container # mounting external volumes into a container > docker run -ti extras docs.docker.com/reference/commandline/cli/
45. docker HUB hub.docker.com
46. docs. docker. com /reference
47. docker.com/community
48. blog. docker.com /docker- weekly- archives
49. Thank you! We invite you to join Operations Israel Facebook group on on.fb.me/Ops-IL www.devops.co.il