Demo of Docker 1.5 features and other container related developments.

1. Docker and Co.
container news from the wild
Rohit Jnagal jnagal@
Johan Euphrosine proppy@

2. Docker 1.5
● Docker build -f demo
● Relative ADD/COPY
● Docker Stats demo
● Read-only container demo
● Docker run --pid demo
● Docker run --memory-*
● faster docker push
● exec in inspect, OOM support
Handling relative ADD/COPY
FROM busybox
RUN echo "root?" > test1.txt
RUN mkdir /test2
WORKDIR /test2
RUN echo "test2" > test2.txt
#ENTRYPOINT ["/usr/bin/pwd"]
ADD add1 .
ADD add2 ./
ADD add3 ./add3_rename
ADD add4 add4

3. Docker 1.5
● Docker build -f demo
● Relative ADD/COPY
● Docker Stats demo
● Read-only container demo
● Docker run --pid demo
● Docker run --memory-*
● faster docker push
● exec in inspect, OOM support
Handling relative ADD/COPY
FROM busybox
RUN echo "root?" > test1.txt
RUN mkdir /test2
WORKDIR /test2
RUN echo "test2" > test2.txt
#ENTRYPOINT ["/usr/bin/pwd"]
ADD add1 .
ADD add2 ./
ADD add3 ./add3_rename
ADD add4 add4
DEMO...

4. Docker images
● Shrinking the base images
○ progrium/busybox [ 4.7 MB ]
■ hard to add dependencies
○ smallest full OS image [ debian: 85 MB ]
○ Alpine [ 5.0 MB ]
■ Get to useful images with much less.
■ from mini-containers/base
■ Demo
● Docker image specification
○ go2docker demo
○ systemd-import
■ systemd-import pull-dck mattdm/fedora
systemd-nspawn -M fedora
import-dck.c
#define INDEX_HOST "index.do" /* the URL we get the data from */ "cker.io"
#define HEADER_TOKEN "X-Do" /* the HTTP header for the auth token */ "cker-Token:"
#define HEADER_REGISTRY "X-Do" /*the HTTP header for the registry */ "cker-Endpoints:"
DEMO...

5. Docker Machine
● Creating docker hosts on local and cloud providers
● docker create machine --driver=google --google-project=... <machine-name>
● Provides config params to talk to remote docker daemon
○ machine config <docker-machine>
○ docker $(machine config docker-machine) run busybox echo hello world
● machine ls
NAME ACTIVE DRIVER STATE URL
docker-machine * google Running tcp://130.201.160.230:2376
● Quirks: versioning
● containervm can do that with manifest for containers with added replicas and auto-scaling.
● Support:
○ Virtualbox,
○ Digital Ocean,
○ Microsoft Azure, Amazon EC2, GCE,
○ VMWare Fusion/vSphere/vCloud,
○ OpenStack
DEMO...

6. Docker Swarm
● Docker native clustering system
● Discovery
○ Static list of IPs or hostfile
○ etcd, consul, zookeeper
● No bootstrapping
● Filters: port, affinity, constraint, health
○ constraints: docker daemon node attributes
○ constraints: standard constraints
○ affinity: container, image
○ port allocation
○ health: avoid unhealthy
● Scheduling strategy:
○ Binpacking
○ Random
● Compose: docker up a group of containers.
DEMO...

7. ● Stage 0
○ Gets the image and sets up root container/manifest for later stages
○ Execs stage1: /stage1/rootfs/init
● Stage 1
○ Generate systemd unit files for application and container manifests.
○ Setup cgroups, namespaces, mounts.
○ Launch root systemd
● Stage 2
○ Launch Manifest
● Systemd is the pod manager
○ takes cares of ordering, restarts, and health checks of containers.
● demo
DEMO...

8. Others
● Weave
○ Network fabric for connecting containers.
● Flocker
○ Container migration w/ data.
● Dokku
○ single host heroku
○ Sponsored by Deis
● Plugins on the way...
DEMO...

9. That’s it
Thanks
Catch me offline for more demo-time.