Discovering Docker Volume Plugins and Apps using VirtualBox
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The document discusses using Docker volume plugins and applications with VirtualBox, emphasizing the ease of handling persistent applications with containers. It provides a detailed agenda, including an overview of volume plugins, configurations, and best practices for ensuring availability and failover. The summary highlights the importance of immutability of container hosts and the orchestration of persistent volumes for efficient container usage.
![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](https://image.slidesharecdn.com/dockervolumepluginwithvirtualbox-160112-160112222859/85/Discovering-Docker-Volume-Plugins-and-Apps-using-VirtualBox-16-320.jpg)
Discovering Docker Volume Plugins and Apps using VirtualBox
- 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& Vagrant&and&VirtualBox • Requires • Vagrant • VirtualBox25.0.10+ • VBoxManage setproperty websrvauthlibrary null • vboxwebsrv -H 0.0.0.0 -v -b
- 10. Vagrant'example git clone https://github.com/jonasrosland/vagrant-rexray cd vagrant-rexray vagrant up vagrant ssh rexray-1
- 11. Discover)REX-Ray)and) VirtulBox)on)rexray-1 sudo su rexray rexray volume --help rexray volume ls rexray volume create --volumename=testing --size=1 rexray volume mount --volumename=testing ls /var/lib/rexray/volumes/testing/data rexray volume unmount --volumename=testing rexray stop rexray start
- 12. docker'volume'create'.' rexray.1 docker volume docker volume create --driver=rexray --name=meetup1 --opt=size=2 docker volume ls
- 13. docker'run'with'busybox docker run -ti --volume-driver=rexray -v meetup1:/meetup1 busybox df /meetup1 touch /meetup1/hello exit
- 14. docker'run'to'verify'with'busybox docker run -ti --volume-driver=busybox -v meetup1:/meetup1 busybox ls /meetup1 exit
- 15. 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
- 16. 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
- 17. Discovering+Apps+and+Volumes+using+postgres • postgres)on)docker)hub • Dockerfile)for)postgres)9.5 • VOLUME)/var/lib/postgresql/data
- 18. running&postgres&,&internal&data&volume docker run --name some-postgres -e POSTGRES_PASSWORD=mysecretpassword -d postgres docker rm -f some-postgres
- 19. 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 ls /var/lib/rexray/volumes/pdata/data docker logs some-postgres exit
- 20. try$a$failover$,$on$rexray,2 vagrant ssh rexray-2 sudo su docker run --name some-postgres -e POSTGRES_PASSWORD=mysecretpassword -d --volume-driver=rexray -v pdata:/var/lib/postgresql/data 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. turn%on%volume%mount%pre,emp-on • vi$/etc/rexray/config.yml • set$rexray.volume.mount.preempt: true • rexray$stop • rexray$start
- 23. do#a#failover#+#on#rexray+2 docker run --name some-postgres -e POSTGRES_PASSWORD=mysecretpassword -d --volume-driver=rexray -v data:/var/lib/postgresql/data postgres
- 24. 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
- 25. 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