Docker and Co.container news from the wild

Rohit Jnagal jnagal@

Johan Euphrosine proppy@

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

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...

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/fedorasystemd-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...

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 lsNAME ACTIVE DRIVER STATE URLdocker-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...

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...

● 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...

Others

● Weave○ Network fabric for connecting containers.

● Flocker○ Container migration w/ data.

● Dokku○ single host heroku○ Sponsored by Deis

● Plugins on the way... DEMO...

That’s it

Thanks

Catch me offline for more demo-time.