Into to Docker (Central PA Java User Group - 8/14/2017)
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This document provides an introduction to Docker, including what Docker is, how it differs from virtual machines, basic Docker commands, examples of running common applications like GitLab and JIRA in Docker containers, and considerations for when to use and not use Docker. Docker allows containerized execution of isolated applications, sharing resources for lighter weight usage than virtual machines. Examples demonstrate pulling public images and running containers from them to execute applications like Python, GitLab and JIRA.
Into to Docker (Central PA Java User Group - 8/14/2017)
- 1. Intro to Docker CPA JUG 2017-09-14 Matt tomasov - [email protected] Mike Melusky - [email protected]
- 2. What is Docker? Docker is containerized management and execution of isolated applications. Virtual Machines (VM Ware, VirtualBox, etc) Parallells WINE ( www.winehq.org )
- 3. How is Docker different from a Virtual Machine Virtual Machines - Each VM needs its own resources from the Host OS and each VM image needs its own local resources. - Very little is shared. Docker - Lightweight Docker engine runs on the Host OS (Can run natively or in lightweight virtual machine) - Docker engine shares image resources. - No need to boot an entire OS for one application.
- 5. List running containers $ docker ps
- 6. Create a Container $ docker run
- 7. List images $ docker images
- 8. Create container from image $ docker run hello-world
- 9. Run python on the hello-world container $ docker run hello-world python --version
- 10. Pull image containing python $ docker pull python
- 11. Run container from that image: $ docker run python python --version
- 12. View the image's directory: $ docker run python ls
- 13. What can we run in Docker? ● Gitlab ● Atlassian JIRA ● Atlassian Confluence ● JetBrains YouTrack
- 15. Docker Hub Image $ docker pull gitlab/gitlab-ce
- 16. Run GitLab Image sudo docker run --detach --hostname gitlab.example.com --publish 443:443 --publish 80:80 --publish 22:22 --name gitlab --restart always --volume /srv/gitlab/config:/etc/gitlab --volume /srv/gitlab/logs:/var/log/gitlab --volume /srv/gitlab/data:/var/opt/gitlab gitlab/gitlab-ce:latest
- 18. Run a JIRA image in Docker $ docker run --detach --publish 8080:8080 cptactionhank/atlassian- jira:latest
- 20. Official Image on Docker Hub $ docker pull atlassian/confluence-server
- 21. Run Confluence Image $> docker run -v /data/your-confluence- home:/var/atlassian/application-data/confluence -- name="confluence" -d -p 8090:8090 -p 8091:8091 atlassian/confluence-server
- 23. Third-party image on Docker Hub $ docker pull zoer/youtrack
- 24. Demo - Create your own Docker image (Matt) - Demo Spring Boot application - Web application with index.jsp - Tomcat integrated in application - Can be run using java -jar <application jar> - Dockerfile - Docker build - Docker docker run
- 25. When to “Dockerize” Simple applications Configuration can be “externalized” Multiple applications, multiple dependencies, “install hell” Constant updates Distribute easily Install can be scripted
- 26. When NOT to “Dockerize” Application configuration is not easily upgraded No need for backups Install is complicated and requires a lot of human thought/interaction
- 27. References Docker - https://docker.io https://www.docker.com/what-docker https://www.docker.com/what-container ZDNet article explaining why Docker is great - http://www.zdnet.com/article/what-is-docker- and-why-is-it-so-darn-popular/
Editor's Notes
- #25: /mnt/sdb1 docker build -t matthewjt/jug:1 . docker build -t matthewjt/jug:2 -f Dockerfile_minimal . docker run -i -p 8080:8080 -t matthewjt/jug:1