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Introduction to Docker at the Azure Meet-up in New York
Docker 
September 2014—Docker 1.2
@jpetazzo 
● Wrote dotCloud PAAS deployment tools 
– EC2, LXC, Puppet, Python, Shell, ØMQ... 
● Docker contributor 
– Security, Networking... 
● Runs all kinds of crazy things in Docker 
– Docker-in-Docker, VPN-in-Docker, 
KVM-in-Docker, Xorg-in-Docker...
Let's start with 
Questions
Raise your hand if you have ... 
● Tried Docker (online tutorial)
Raise your hand if you have ... 
● Tried Docker (online tutorial) 
● Tried the real Docker (e.g. deployed remote VM)
Raise your hand if you have ... 
● Tried Docker (online tutorial) 
● Tried the real Docker (e.g. deployed remote VM) 
● Installed Docker locally (e.g. with boot2docker)
Raise your hand if you have ... 
● Tried Docker (online tutorial) 
● Tried the real Docker (e.g. deployed remote VM) 
● Installed Docker locally (e.g. with boot2docker) 
● Written a Dockerfile (and built it!)
Raise your hand if you have ... 
● Tried Docker (online tutorial) 
● Tried the real Docker (e.g. deployed remote VM) 
● Installed Docker locally (e.g. with boot2docker) 
● Written a Dockerfile (and built it!) 
● An image on Docker Hub (pushed or autobuilt)
Raise your hand if you have ... 
● Tried Docker (online tutorial) 
● Tried the real Docker (e.g. deployed remote VM) 
● Installed Docker locally (e.g. with boot2docker) 
● Written a Dockerfile (and built it!) 
● An image on Docker Hub (pushed or autobuilt) 
● Deployed Docker images for dev/QA/test/prod...
Agenda 
● What is Docker and Why it matters 
● What are containers 
● The Docker ecosystem (Engine, Hub, etc.) 
● Deployment options and first steps 
● What's new in the latest Docker?
What 
is Docker 
Why 
it matters
Deploy everything 
● Webapps 
● Backends 
● SQL, NoSQL 
● Big data 
● Message queues 
● … and more
Deploy almost everywhere 
● Linux servers 
● VMs or bare metal 
● Any distro 
● Kernel 3.8+ (or RHEL 2.6.32) 
Currently: focus on x86_64. 
(But people reported success on arm.)
Deploy reliably & consistently
Introduction to Docker at the Azure Meet-up in New York
Deploy reliably & consistently 
● If it works locally, it will work on the server 
● With exactly the same behavior 
● Regardless of versions 
● Regardless of distros 
● Regardless of dependencies
Deploy efficiently 
● Containers are lightweight 
– Typical laptop runs 10-100 containers easily 
– Typical server can run 100-1000 containers 
● Containers can run at native speeds 
– Lies, damn lies, and other benchmarks: 
http://qiita.com/syoyo/items/bea48de8d7c6d8c73435 
http://www.slideshare.net/BodenRussell/kvm-and-docker-lxc-benchmarking-with-openstack
Infiniband throughput and latency: 
no difference at all
Booting 15 OpenStack VMs: 
KVM vs Docker
Memory speed: 
Bare Metal vs Docker vs KVM
OK, but 
what is 
Docker?
Docker Engine 
+ Docker Hub 
= Docker Platform
The Docker 
Engine runs 
containers.
OK, but 
what is a 
container?
High level approach: 
it's a lightweight VM 
● Own process space 
● Own network interface 
● Can run stuff as root 
● Can have its own /sbin/init 
(different from the host) 
« Machine Container »
Low level approach: 
it's chroot on steroids 
● Can also not have its own /sbin/init 
● Container = isolated process(es) 
● Share kernel with host 
● No device emulation (neither HVM nor PV) 
« Application Container »
Stop. 
Demo time.
Introduction to Docker at the Azure Meet-up in New York
Alright, I get this. 
Containers = nimble Vms. 
Let's just tell the CFO, 
and get back to work!
Introduction to Docker at the Azure Meet-up in New York
What happens when 
something becomes 
10-100x cheaper?
Random example: 
testing 
● Project X has 100 unit tests 
● Each test needs a pristine SQL database
Random example: 
testing 
● Project X has 100 unit tests 
● Each test needs a pristine SQL database 
● Plan A: spin up 1 database, clean after each use 
– If we don't clean correctly, random tests will fail 
– Cleaning correctly can be expensive (e.g. reload DB)
Random example: 
testing 
● Project X has 100 unit tests 
● Each test needs a pristine SQL database 
● Plan B: spin up 100 databases 
– … in parallel: needs too much resources 
– … one after the other: takes too long
Random example: 
testing 
● Project X has 100 unit tests 
● Each test needs a pristine SQL database 
● Plan C: spin up 100 databases in containers 
– fast, efficient (no overhead, copy-on-write) 
– easy to implement without virtualization black belt
Containers 
make testing 
(and many other things) 
way easier
The container metaphor
Problem: shipping goods 
? ? ? ? ? ? 
? ? ? ? ? ? 
? ? ? ? ? ? 
? ? ? ? ? ? 
? ? ? ? ? ? 
? ? ? ? ? ?
Solution: 
the intermodal shipping container
Solved!
Problem: shipping code 
? ? ? ? ? ? 
? ? ? ? ? ? 
? ? ? ? ? ? 
? ? ? ? ? ? 
? ? ? ? ? ? 
? ? ? ? ? ?
Solution: 
the Linux container
Solved!
Separation of concerns: 
Dave the Developer 
● Inside my container: 
– my code 
– my libraries 
– my package manager 
– my app 
– my data
Separation of concerns: 
Oscar the Ops guy 
● Outside the container: 
– logging 
– remote access 
– network configuration 
– monitoring
Docker's 
Entourage
Docker: the cast 
● Docker Engine 
● Docker Hub 
● Docker, the community 
● Docker Inc, the company
Docker Engine 
● Open Source engine to commoditize LXC 
● Uses copy-on-write for quick provisioning 
● Written in Go, runs as a daemon, comes with a CLI 
● Everything exposed through a REST API 
● Allows to build images in standard, reproducible way 
● Allows to share images through registries 
● Defines standard format for containers 
(stack of layers; 1 layer = tarball+metadata)
… Open Source? 
● Nothing up the sleeve, everything on the table 
– Public GitHub repository: https://github.com/dotcloud/docker 
– Bug reports: GitHub issue tracker 
– Mailing lists: docker-user, docker-dev (Google groups) 
– IRC channels: #docker, #docker-dev (Freenode) 
– New features: GitHub pull requests (see CONTRIBUTING.md) 
– Docker Governance Advisory Board (elected by contributors)
Docker Hub 
Collection of services to make Docker more useful. 
● Public registry 
(push/pull your images for free) 
● Private registry 
(push/pull secret images for $) 
● Automated builds 
(link github/bitbucket repo; trigger build on commit) 
● More to come!
Docker, the community 
● >500 contributors 
● ~20 core maintainers 
● >8,000 Dockerized projects on GitHub 
● >30,000 repositories on Docker Hub 
● >250 meetups in >90 cities in >30 countries 
● >750,000 downloads of boot2docker
Docker Inc, the company 
● Headcount: ~50 
● Led by Open Source veteran Ben Golub 
(GlusterFS) 
● Revenue: 
– t-shirts and stickers featuring the cool blue whale 
– SAAS delivered through Docker Hub 
– Support & Training
Using 
Docker
One-time setup 
● On your dev env (Linux, OS X, Windows) 
– boot2docker (25 MB VM image) 
– Natively (if you run Linux) 
● On your servers (Linux) 
– Packages (Ubuntu, Debian, Fedora, Gentoo, Arch...) 
– Single binary install (Golang FTW!) 
– Easy provisioning on Azure, Rackspace, Digital Ocean... 
– Special distros: CoreOS, Project Atomic
Azure deployment 
VMNAME=jpetazzo 
IMAGE=b39f27a8b8c64d52b05eac6a62ebad85__Ubuntu-14_04-LTS-amd64-server-20140724-en-us- 
30GB 
USER=jpetazzo 
PASSWORD=1234abcdABCD@ 
LOCATION="West US" 
azure vm docker create $VMNAME  
$IMAGE $USER $PASSWORD -l "$LOCATION" 
export DOCKER_HOST=tcp://$VMNAME.cloudapp.net:4243 
docker --tls version 
azure vm endpoint create $VMNAME 80
Authoring images 
with a Dockerfile
FROM ubuntu:14.04 
RUN apt-get update 
RUN apt-get install -y nginx 
RUN echo 'Hi, I am in your container!'  
>/usr/share/nginx/html/index.html 
CMD nginx -g "daemon off;" 
EXPOSE 80 
docker build -t jpetazzo/staticweb . 
docker run -P jpetazzo/staticweb
Introduction to Docker at the Azure Meet-up in New York
FROM ubuntu:12.04 
RUN apt-get -y update 
RUN apt-get install -y g++ 
RUN apt-get install -y erlang-dev erlang-base-hipe ... 
RUN apt-get install -y libmozjs185-dev libicu-dev libtool ... 
RUN apt-get install -y make wget 
RUN wget http://.../apache-couchdb-1.3.1.tar.gz  
| tar -C /tmp -zxf- 
RUN cd /tmp/apache-couchdb-* && ./configure && make install 
RUN printf "[httpd]nport = 8101nbind_address = 0.0.0.0"  
> /usr/local/etc/couchdb/local.d/docker.ini 
EXPOSE 8101 
CMD ["/usr/local/bin/couchdb"] 
docker build -t jpetazzo/couchdb .
FROM debian:jessie 
RUN apt-get -y update 
RUN apt-get install -y python-pip 
RUN mkdir /src 
WORKDIR /src 
ADD requirements.txt /src 
RUN pip install -r requirements.txt 
ADD . /src 
RUN python setup.py install
Do you even 
Chef? 
Puppet? 
Ansible? 
Salt?
Introduction to Docker at the Azure Meet-up in New York
Summary 
With Docker, I can: 
● put my software in containers 
● run those containers anywhere 
● write recipes to automatically build containers
Advanced concepts 
● naming 
– give a unique name to your containers 
● links 
– connect containers together 
● volumes 
– separate code and data 
– share data between containers
Recent features: 0.10 
● TLS support for API access 
● Configurable DNS search 
● BTRFS is no longer experimental 
● Integration with systemd cgroups 
● Use proxy environment variables (for registry)
Recent features: 0.11 
● SELinux integration 
(works better with CentOS) 
● DNS integration for links 
(access linked containers by hostname) 
● « docker run --net » 
– use host networking for high speed 
– share network of another container
Recent features: 0.12 
● docker pause/unpause 
● more importantly: 1.0 release candidate :-)
Docker 1.1 
● .dockerignore 
(don't upload your .git anymore!) 
● docker logs --tail 
– further logging improvements on the way 
(truncate)
Docker 1.2 
● New cool options for docker run 
--restart=always/no/on-failure 
--cap-add=NETADMIN 
--cap-drop=CHOWN 
--device=/dev/kvm:/dev/kvm
Coming soon 
(maybe) 
● logging improvements 
● device mapper tuning 
● image squashing 
● ARM support 
● use secrets in builds 
● volume management 
● hairpin nat 
● IPV6 support 
● seccomp + native 
● user namespaces
Thank you! Questions? 
http://docker.com/ 
@docker 
@jpetazzo

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Introduction to Docker at the Azure Meet-up in New York

  • 3. @jpetazzo ● Wrote dotCloud PAAS deployment tools – EC2, LXC, Puppet, Python, Shell, ØMQ... ● Docker contributor – Security, Networking... ● Runs all kinds of crazy things in Docker – Docker-in-Docker, VPN-in-Docker, KVM-in-Docker, Xorg-in-Docker...
  • 4. Let's start with Questions
  • 5. Raise your hand if you have ... ● Tried Docker (online tutorial)
  • 6. Raise your hand if you have ... ● Tried Docker (online tutorial) ● Tried the real Docker (e.g. deployed remote VM)
  • 7. Raise your hand if you have ... ● Tried Docker (online tutorial) ● Tried the real Docker (e.g. deployed remote VM) ● Installed Docker locally (e.g. with boot2docker)
  • 8. Raise your hand if you have ... ● Tried Docker (online tutorial) ● Tried the real Docker (e.g. deployed remote VM) ● Installed Docker locally (e.g. with boot2docker) ● Written a Dockerfile (and built it!)
  • 9. Raise your hand if you have ... ● Tried Docker (online tutorial) ● Tried the real Docker (e.g. deployed remote VM) ● Installed Docker locally (e.g. with boot2docker) ● Written a Dockerfile (and built it!) ● An image on Docker Hub (pushed or autobuilt)
  • 10. Raise your hand if you have ... ● Tried Docker (online tutorial) ● Tried the real Docker (e.g. deployed remote VM) ● Installed Docker locally (e.g. with boot2docker) ● Written a Dockerfile (and built it!) ● An image on Docker Hub (pushed or autobuilt) ● Deployed Docker images for dev/QA/test/prod...
  • 11. Agenda ● What is Docker and Why it matters ● What are containers ● The Docker ecosystem (Engine, Hub, etc.) ● Deployment options and first steps ● What's new in the latest Docker?
  • 12. What is Docker Why it matters
  • 13. Deploy everything ● Webapps ● Backends ● SQL, NoSQL ● Big data ● Message queues ● … and more
  • 14. Deploy almost everywhere ● Linux servers ● VMs or bare metal ● Any distro ● Kernel 3.8+ (or RHEL 2.6.32) Currently: focus on x86_64. (But people reported success on arm.)
  • 15. Deploy reliably & consistently
  • 17. Deploy reliably & consistently ● If it works locally, it will work on the server ● With exactly the same behavior ● Regardless of versions ● Regardless of distros ● Regardless of dependencies
  • 18. Deploy efficiently ● Containers are lightweight – Typical laptop runs 10-100 containers easily – Typical server can run 100-1000 containers ● Containers can run at native speeds – Lies, damn lies, and other benchmarks: http://qiita.com/syoyo/items/bea48de8d7c6d8c73435 http://www.slideshare.net/BodenRussell/kvm-and-docker-lxc-benchmarking-with-openstack
  • 19. Infiniband throughput and latency: no difference at all
  • 20. Booting 15 OpenStack VMs: KVM vs Docker
  • 21. Memory speed: Bare Metal vs Docker vs KVM
  • 22. OK, but what is Docker?
  • 23. Docker Engine + Docker Hub = Docker Platform
  • 24. The Docker Engine runs containers.
  • 25. OK, but what is a container?
  • 26. High level approach: it's a lightweight VM ● Own process space ● Own network interface ● Can run stuff as root ● Can have its own /sbin/init (different from the host) « Machine Container »
  • 27. Low level approach: it's chroot on steroids ● Can also not have its own /sbin/init ● Container = isolated process(es) ● Share kernel with host ● No device emulation (neither HVM nor PV) « Application Container »
  • 30. Alright, I get this. Containers = nimble Vms. Let's just tell the CFO, and get back to work!
  • 32. What happens when something becomes 10-100x cheaper?
  • 33. Random example: testing ● Project X has 100 unit tests ● Each test needs a pristine SQL database
  • 34. Random example: testing ● Project X has 100 unit tests ● Each test needs a pristine SQL database ● Plan A: spin up 1 database, clean after each use – If we don't clean correctly, random tests will fail – Cleaning correctly can be expensive (e.g. reload DB)
  • 35. Random example: testing ● Project X has 100 unit tests ● Each test needs a pristine SQL database ● Plan B: spin up 100 databases – … in parallel: needs too much resources – … one after the other: takes too long
  • 36. Random example: testing ● Project X has 100 unit tests ● Each test needs a pristine SQL database ● Plan C: spin up 100 databases in containers – fast, efficient (no overhead, copy-on-write) – easy to implement without virtualization black belt
  • 37. Containers make testing (and many other things) way easier
  • 39. Problem: shipping goods ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
  • 40. Solution: the intermodal shipping container
  • 42. Problem: shipping code ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
  • 43. Solution: the Linux container
  • 45. Separation of concerns: Dave the Developer ● Inside my container: – my code – my libraries – my package manager – my app – my data
  • 46. Separation of concerns: Oscar the Ops guy ● Outside the container: – logging – remote access – network configuration – monitoring
  • 48. Docker: the cast ● Docker Engine ● Docker Hub ● Docker, the community ● Docker Inc, the company
  • 49. Docker Engine ● Open Source engine to commoditize LXC ● Uses copy-on-write for quick provisioning ● Written in Go, runs as a daemon, comes with a CLI ● Everything exposed through a REST API ● Allows to build images in standard, reproducible way ● Allows to share images through registries ● Defines standard format for containers (stack of layers; 1 layer = tarball+metadata)
  • 50. … Open Source? ● Nothing up the sleeve, everything on the table – Public GitHub repository: https://github.com/dotcloud/docker – Bug reports: GitHub issue tracker – Mailing lists: docker-user, docker-dev (Google groups) – IRC channels: #docker, #docker-dev (Freenode) – New features: GitHub pull requests (see CONTRIBUTING.md) – Docker Governance Advisory Board (elected by contributors)
  • 51. Docker Hub Collection of services to make Docker more useful. ● Public registry (push/pull your images for free) ● Private registry (push/pull secret images for $) ● Automated builds (link github/bitbucket repo; trigger build on commit) ● More to come!
  • 52. Docker, the community ● >500 contributors ● ~20 core maintainers ● >8,000 Dockerized projects on GitHub ● >30,000 repositories on Docker Hub ● >250 meetups in >90 cities in >30 countries ● >750,000 downloads of boot2docker
  • 53. Docker Inc, the company ● Headcount: ~50 ● Led by Open Source veteran Ben Golub (GlusterFS) ● Revenue: – t-shirts and stickers featuring the cool blue whale – SAAS delivered through Docker Hub – Support & Training
  • 55. One-time setup ● On your dev env (Linux, OS X, Windows) – boot2docker (25 MB VM image) – Natively (if you run Linux) ● On your servers (Linux) – Packages (Ubuntu, Debian, Fedora, Gentoo, Arch...) – Single binary install (Golang FTW!) – Easy provisioning on Azure, Rackspace, Digital Ocean... – Special distros: CoreOS, Project Atomic
  • 56. Azure deployment VMNAME=jpetazzo IMAGE=b39f27a8b8c64d52b05eac6a62ebad85__Ubuntu-14_04-LTS-amd64-server-20140724-en-us- 30GB USER=jpetazzo PASSWORD=1234abcdABCD@ LOCATION="West US" azure vm docker create $VMNAME $IMAGE $USER $PASSWORD -l "$LOCATION" export DOCKER_HOST=tcp://$VMNAME.cloudapp.net:4243 docker --tls version azure vm endpoint create $VMNAME 80
  • 57. Authoring images with a Dockerfile
  • 58. FROM ubuntu:14.04 RUN apt-get update RUN apt-get install -y nginx RUN echo 'Hi, I am in your container!' >/usr/share/nginx/html/index.html CMD nginx -g "daemon off;" EXPOSE 80 docker build -t jpetazzo/staticweb . docker run -P jpetazzo/staticweb
  • 60. FROM ubuntu:12.04 RUN apt-get -y update RUN apt-get install -y g++ RUN apt-get install -y erlang-dev erlang-base-hipe ... RUN apt-get install -y libmozjs185-dev libicu-dev libtool ... RUN apt-get install -y make wget RUN wget http://.../apache-couchdb-1.3.1.tar.gz | tar -C /tmp -zxf- RUN cd /tmp/apache-couchdb-* && ./configure && make install RUN printf "[httpd]nport = 8101nbind_address = 0.0.0.0" > /usr/local/etc/couchdb/local.d/docker.ini EXPOSE 8101 CMD ["/usr/local/bin/couchdb"] docker build -t jpetazzo/couchdb .
  • 61. FROM debian:jessie RUN apt-get -y update RUN apt-get install -y python-pip RUN mkdir /src WORKDIR /src ADD requirements.txt /src RUN pip install -r requirements.txt ADD . /src RUN python setup.py install
  • 62. Do you even Chef? Puppet? Ansible? Salt?
  • 64. Summary With Docker, I can: ● put my software in containers ● run those containers anywhere ● write recipes to automatically build containers
  • 65. Advanced concepts ● naming – give a unique name to your containers ● links – connect containers together ● volumes – separate code and data – share data between containers
  • 66. Recent features: 0.10 ● TLS support for API access ● Configurable DNS search ● BTRFS is no longer experimental ● Integration with systemd cgroups ● Use proxy environment variables (for registry)
  • 67. Recent features: 0.11 ● SELinux integration (works better with CentOS) ● DNS integration for links (access linked containers by hostname) ● « docker run --net » – use host networking for high speed – share network of another container
  • 68. Recent features: 0.12 ● docker pause/unpause ● more importantly: 1.0 release candidate :-)
  • 69. Docker 1.1 ● .dockerignore (don't upload your .git anymore!) ● docker logs --tail – further logging improvements on the way (truncate)
  • 70. Docker 1.2 ● New cool options for docker run --restart=always/no/on-failure --cap-add=NETADMIN --cap-drop=CHOWN --device=/dev/kvm:/dev/kvm
  • 71. Coming soon (maybe) ● logging improvements ● device mapper tuning ● image squashing ● ARM support ● use secrets in builds ● volume management ● hairpin nat ● IPV6 support ● seccomp + native ● user namespaces
  • 72. Thank you! Questions? http://docker.com/ @docker @jpetazzo