Docker 101 - Mario Loriedo

Transcript

1. Docker 101 Introduction to Docker and Lightweight Containers
2. Hi I'm Mario Italian based in Paris Software Engineer @ Zenika (ex IBMer) Docker official trainer and contributor I've developped sublime docker and doclipser mariolet l0rd
3. Some well known problems Steve, the (un)believer developer: "It works on my machine!" Bill, an (im)patient developer: "It took me one week to setup the development environment"
4. One solution: Traditional Virtual Machines • Consistent environments • Repeatable wherever you want • Versioning • Automated setup
5. A better solution: Lightweight Containers
6. Why Docker? Lightweight containers is a 15yrs old technology. With Docker it has become: • Easy to use • Widely adopted • Defined a standard
7. Easy to run a container docker run -ti ubuntu
8. Easy to run a container What happened here? • Generated an Linux container • Allocated a new file system • Mounted a read/write layer • Allocated a network interface • Set an IP for it • Run a process inside the container • Captured the output and returned to the client
9. DockerHub and official images
10. Easy to create a custom image Dockerfile FROM ubuntu RUN apt-get install -y curl CMD curl ipinfo.io/ip $ docker build -t mycustomimage . $ docker run mycustomimage
11. Volumes to persist data This cattle vs pets thing docker run -ti ubuntu docker run -ti ubuntu Volumes and the state of an application docker run -ti -v ~/data/:/data/ ubuntu
12. Links to let containers talk securely # Run tomcat in a container docker run -d --name myserver tomcat # Access to tomcat from another container docker run --link myserver \ fedora \ curl myserver:8080
13. Multi-containers configurations db: image: postgres web: build: . command: python manage.py runserver 0.0.0.0:8000 volumes: - .:/code ports: - "8000:8000" links: - db Docker Compose YML file