There are right and wrong ways to use containers with persistent applications. Lucky for you, doing it the right way is much easier nowadays with Docker Volume Plugins. This talk will focus on doing some basic education including mostly live demos to show how you can take advantage of these new capabilities for expanding how you leverage containers. We will be going through a workflow that you can do yourself using boot2docker.

1. Discovering+Volume+
Plugins+with+
Applica7ons+using+
Docker+Toolbox+and+
VirtualBox
Clint&Kitson&*&Developer&
Advocate&Leader
emccode.github.io

2. descrip(on
There%are%right%and%wrong%ways%to%use%containers%with%persistent%
applica4ons.%Lucky%for%you,%doing%it%the%right%way%is%much%easier%
nowadays%with%Docker%Volume%Plugins.%This%talk%will%focus%on%doing%
some%basic%educa4on%including%mostly%live%demos%to%show%how%you%
can%take%advantage%of%these%new%capabili4es%for%expanding%how%
you%leverage%containers.%We%will%be%going%through%a%workflow%that%
you%can%do%yourself%using%boot2docker.

3. Agenda
• Docker(Volume(Plugin(overview
• Volume(Plugins(with(VirtualBox(in(ac9on
• Inves9ga9ng(applica9ons(and(running(with(Volume(Plugin
• Thinking(about(availability
• Performing(failAover(of(a(container(to(another(container(host

4. Situa&on/Problem
• When&I&run&a&persistent&applica1on&in&a&container,&where&does&
my&data&get&stored?
• Possibly&a&data&volume
• Possibly&container&volume
• Possibly&an&exis1ng&private&mounted&volume&from&networked&
storage
• ..&howto&build&a&snowflake
• Container&hosts&should&be&immutable

5. Enter&Docker&Extensibility
• Volume
• Network
• Authoriza2on
• Composable8and8sustainable
• Consumed8solely8through8Docker8API
• Up8to8consuming8ecoAsystem8to8leverage8func2onality,8ie.8
container8schedulers

6. What%are%Docker%Volume%
Plugins
• Drama&cally*simplifies*external*storage*
for*usage*with*containers
• Service*that*runs*alongside*Docker*
daemon*receiving*Plugin*requests
• Extensible*storage*orchestra&on
• Lunch*is*ready*at*/var/lib/
plugin/volumes/vol1/data
• Serves*requests*for*Volume*Create/
Remove/Mount/Unmount/Path

7. How$do$we$play?
• VirtualBox,can,be,used,similar,to,
explore
• VirtualBox,is,popular,and,works,well,
on,laptops
• Provides,shared,storage,pla;orm,
through,Virtual,Media
• or,GCE,,AWS,EC2,,Openstack,Cinder,,
EMC,ScaleIO/XtremIO/Isilon/VMAX
• or,other,Volume,Plugins
• MulIple,container,hosts,(VMs),to,
ensure,failover,and,immutability

8. Typical(Install(and(Configure
• Install
curl -sSL https://dl.bintray.com/emccode/rexray/install | sh -
• /etc/rexray/config.yml
rexray:
logLevel: warn
storageDrivers:
- virtualbox
mount:
volume:
preempt: false
virtualbox:
endpoint: http://10.0.2.2:18083
tls: false
volumePath: "/Users/clintonkitson/Repos/vagrant-rexray/Volumes"
controllerName: SATA

9. Super&Simple&Example&using&
Docker&Toolbox
• Requires
• Docker-Toolbox-1.9.1+
• VirtualBox-5.0.10+
• VBoxManage setproperty
websrvauthlibrary null
• vboxwebsrv -H 0.0.0.0 -v -b

10. Docker'Machine'example'1'tes4ng1
docker-machine create --driver=virtualbox testing1
docker-machine ssh testing1
"wget http://tinycorelinux.net/6.x/x86_64/tcz/udev-extra.tcz
&& tce-load -i udev-extra.tcz && sudo udevadm trigger"
docker-machine ssh testing1
"curl -sSL https://dl.bintray.com/emccode/rexray/install | sh -"
// optional instead of curl-bash
curl -ssL
https://dl.bintray.com/emccode/rexray/stable/latest/rexray-Linux-x86_64.tar.gz
-o rexray.tar.gz && tar -zxvf rexray.tar.gz
docker-machine scp rexray testing1:~/.
docker-machine ssh testing1
"sudo mv ~/rexray /usr/bin/. &&
sudo rexray install"
// end optional
docker-machine ssh testing1
"sudo tee -a /etc/rexray/config.yml << EOF
rexray:
storageDrivers:
- virtualbox
volume:
mount:
preempt: false
virtualbox:
endpoint: http://10.0.2.2:18083
tls: false
volumePath: /Users/clintonkitson/VirtualBox Volumes
controllerName: SATA
"
docker-machine ssh testing1 "sudo rexray start"

11. Docker'Machine'example'1'tes4ng2
docker-machine create --driver=virtualbox testing2
docker-machine ssh testing2
"wget http://tinycorelinux.net/6.x/x86_64/tcz/udev-extra.tcz
&& tce-load -i udev-extra.tcz && sudo udevadm trigger"
docker-machine ssh testing2
"curl -sSL https://dl.bintray.com/emccode/rexray/install | sh -"
// optional instead of curl-bash
curl -ssL
https://dl.bintray.com/emccode/rexray/stable/latest/rexray-Linux-x86_64.tar.gz
-o rexray.tar.gz && tar -zxvf rexray.tar.gz
docker-machine scp rexray testing2:~/.
docker-machine ssh testing2
"sudo mv ~/rexray /usr/bin/. &&
sudo rexray install"
// end optional
docker-machine ssh testing2
"sudo tee -a /etc/rexray/config.yml << EOF
rexray:
storageDrivers:
- virtualbox
volume:
mount:
preempt: false
virtualbox:
endpoint: http://10.0.2.2:18083
tls: false
volumePath: /Users/clintonkitson/VirtualBox Volumes
controllerName: SATA
"
docker-machine ssh testing2 "sudo rexray start"

12. Discover)REX-Ray)and)
VirtulBox)on)tes8ng1
docker-machine ssh testing1
sudo su
rexray
rexray volume --help
rexray volume ls
rexray volume create --volumename=testvol1 --size=1
rexray volume mount --volumename=testvol1
ls /var/lib/rexray/volumes/testvol1/data
rexray volume unmount --volumename=testvol1
rexray stop
rexray start
exit

13. docker'volume'create'.'
tes0ng1
eval $(docker-machine env testing1)
docker volume
docker volume create
--driver=rexray --name=meetup1 --opt=size=2
docker volume ls

14. docker'run'with'busybox
docker run -ti
--volume-driver=rexray -v meetup1:/meetup1
busybox
df /meetup1
touch /meetup1/hello
exit

15. docker'run'to'verify'with'busybox
docker run -ti
--volume-driver=rexray -v meetup1:/meetup1
busybox
ls /meetup1
exit

16. docker'run'with'sharing'
volume
docker run -tid --name=container1
--volume-driver=rexray -v meetup1:/meetup1 busybox
docker run -ti --volumes-from=container1 busybox
ls /meetup1
exit
docker exec container1 ls /meetup1
docker stop container1

17. Discovering+Volumes+and+Container+Images
• REX%Ray(Docs(on(Applica2ons
• Dockerfile(includes(a(VOLUME(instruc2on
• VOLUME(["/data"]
• Up(to(container(image(maintainer(to(properly(designate(
appropriate(loca2on(of(persistent(data
• Makes(a(container(workload(portable
• Enables(immutable(hosts

18. Discovering+Apps+and+Volumes+using+postgres
• postgres)on)docker)hub
• Dockerfile)for)postgres)9.5
• VOLUME)/var/lib/postgresql/data

19. running&postgres&,&internal&data&volume
docker run --name some-postgres
-e POSTGRES_PASSWORD=mysecretpassword -d
postgres
docker rm -f some-postgres

20. running&postgres&,&external&data&volume
docker volume create
--driver=rexray --name=pdata --opt=size=3
docker run --name some-postgres
-e POSTGRES_PASSWORD=mysecretpassword -d
--volume-driver=rexray -v pdata:/var/lib/postgresql/data
postgres
docker-machine ssh testing1 sudo ls /var/lib/rexray/volumes/pdata/data
docker logs some-postgres

21. Thinking'About'Availability
• Always(sharing(isn't(the(answer
• Safety(first(for(ext4/xfs
• Failure(scenarios?
• Container(dies?
• Container(run>me(borks?
• Kernel(problems?
• Host(unresponsive?
• ..(volumes(are(typically(aGached(and(
locked(to(hosts

22. try$a$failover$,$on$tes/ng2
eval $(docker-machine env testing2)
docker run --name some-postgres
-e POSTGRES_PASSWORD=mysecretpassword -d
--volume-driver=rexray -v pdata:/var/lib/postgresql/data
postgres

23. turn%on%volume%mount%pre,emp-on
• docker-machine ssh testing2
• sudo vi /etc/rexray/config.yml
• set%rexray.volume.mount.preempt: true
• sudo rexray stop
• sudo rexray start
• exit

24. do#a#failover#+#on#tes/ng2
docker rm some-postgres
docker run --name some-postgres
-e POSTGRES_PASSWORD=mysecretpassword -d
--volume-driver=rexray -v pdata:/var/lib/postgresql/data
postgres

25. Summary
• Volume(plugins(are(great
• Keep(container(hosts(immutable
• Persistent(volumes(can(be(orchestrated(for(containers
• Container(images(with(volumes(specified(are(easy(to(make(
persistent

26. EMC${code}$+$emccode.github.io
• Looking(for(folks(that(are(passionate(about(Containers,(Open(
Source,(and(DevOps
• REX?Ray
• RackHD
• mesos?module?dvdi
• OSS(ContribuCon(?(Docker,(Mesos,(others

27. THANK&YOU
emccode.github.io