Docker introduction for Carbon IT

Mar 6, 20182 likes158 views

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.

Introduction to Docker
The lightweight, portable, flexible containers

A bit of history
● 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)

So what is a 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

But we have Virtual 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

Overlook of Docker Containers vs Virtual Machines

Two building blocks for 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.

Image & Layers
At start, 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

Diving into docker
Mainly:
● Ecosystem & architecture
● Image DSL
● Container lifecycle
● Networking
● Volume

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

Networking
Linux Bridge (for creating 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

Data
Volumes are stored in 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.

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/

Docker uses virtualization techniques like namespaces and cgroups to isolate processes and share resources efficiently across multiple Linux containers. Namespaces isolate things like process IDs, network interfaces, and mounted filesystems between containers, while cgroups limit resources like CPU and memory for containers. AuFS combines multiple filesystem layers into one for containers. Docker builds on these technologies to package applications and their dependencies into lightweight Linux containers that can run virtually anywhere.

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