Download as PDF, PPTX
![Docker - Image DSL example
FROM ubuntu
RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10 && echo 'deb
http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' | tee
/etc/apt/sources.list.d/mongodb.list
RUN apt-get update && apt-get install -y mongodb-10gen
RUN mkdir -p /data/db
EXPOSE 27017
CMD ["--port 27017"]
ENTRYPOINT usr/bin/mongod](https://image.slidesharecdn.com/dockerintroduction-180306065746/85/Docker-introduction-for-Carbon-IT-12-320.jpg)
![Docker - Image DSL example
FROM ubuntu
RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10 && echo 'deb
http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' | tee
/etc/apt/sources.list.d/mongodb.list
RUN apt-get update && apt-get install -y mongodb-10gen
RUN mkdir -p /data/db
EXPOSE 27017
CMD ["--port 27017"]
ENTRYPOINT usr/bin/mongod](https://image.slidesharecdn.com/dockerintroduction-180306065746/75/Docker-introduction-for-Carbon-IT-12-2048.jpg)
Uploaded byyannick grenzinger
Docker introduction for Carbon IT
Docker allows for the use of lightweight containers that share the host operating system kernel. Containers isolate applications from one another and provide a way to package applications with their dependencies. Containers use resource isolation features and union file systems for efficiency. Docker images are built from layers and can be distributed. The Docker ecosystem includes tools for the container lifecycle, networking, storage, and distribution of images.
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Docker introduction for Carbon IT
- 1. Introduction to Docker Thelightweight, portable, flexible containers
- 3. A bit ofhistory ● FreeBSD Jails circa 2000 ● Solaris Zones circa 2004 ● LXC (Google) circa 2008 ● Systemd-nspawn circa 2010-2013 ● Docker circa 2013 ○ built on LXC ○ moved to libcontainer (March 2014) ○ appC (CoreOS) announced (December 2014) ○ Open Containers standard for convergence with Docker Announced (June 2015) ○ moved to runC (OCF compliant) (July 2015)
- 4. So what isa container, technically ? ● Containers share the host kernel ● Containers use the kernel ability to group processes for resource control ● Containers ensure isolation through namespaces ● Containers feel like lightweight VMs (lower footprint, faster) Components of a container ecosystem include: ● Runtime ● Image distribution ● Tooling
- 5. But we haveVirtual Machine ! ● Performance cost ? Not so much ● Less efficient. On the same bare-metal server, many duplicate instances of the same OS and many redundant boot volumes ● Slower to start and stop ● Less DevOps friendly ● However more secure and easier to constrain (important for a public cloud operator) Good slides comparing Containers vs VMs
- 6. Overlook of DockerContainers vs Virtual Machines
- 7. Two building blocksfor containers Linux namespaces, originally developed by IBM, deal with resource isolation (Users, PID, Mount, Network...)for a single process. Linux cgroups, originally developed by Google, allow processes to be organized into hierarchical groups whose usage of various types of resources (CPU, memory..) can then be limited and monitored.
- 8. Image & Layers Atstart, a container prepares rootfs & uses chroot for the container filesystem isolation Docker uses Union File Systems to speed up and reduce size which provide: ● Layering ● Copy-On-Write ● Caching ● Diffing
- 9. Diving into docker Mainly: ●Ecosystem & architecture ● Image DSL ● Container lifecycle ● Networking ● Volume
- 10.
- 11.
- 12. Docker - ImageDSL example FROM ubuntu RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10 && echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' | tee /etc/apt/sources.list.d/mongodb.list RUN apt-get update && apt-get install -y mongodb-10gen RUN mkdir -p /data/db EXPOSE 27017 CMD ["--port 27017"] ENTRYPOINT usr/bin/mongod
- 13.
- 14. Networking Linux Bridge (forcreating virtual switches) together with IPTables functionality to create isolated container networks and expose container ports. Also easy communication with internal DNS between container in the same network
- 15. Data Volumes are storedin a part of the host filesystem which is managed by Docker (/var/lib/docker/volumes/ on Linux). Bind mounts may be stored anywhere on the host system. tmpfs mounts are stored in the host system’s memory only.
- 16. Links ● https://www.infoworld.com/article/3204171/linux/what-is-d ocker-linux-containers-explained.html ● http://docker-saigon.github.io/post/Docker-Internals/ ●https://www.youtube.com/watch?v=sK5i-N34im8&t=3s ● https://github.com/wsargent/docker-cheat-sheet ● https://dmitryfrank.com/projects/docker-quick-ref ● https://veggiemonk.github.io/awesome-docker/