Post on 21-Jan-2017
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WHAT YOU ALWAYS WANTED TO KNOW ABOUT CONTAINER ORCHESTRATION AND NEVER DARED TO ASK
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Michael Hausenblas | All Things Open | Raleigh, NC | 2015-10-20
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CONTAINERS ARE LIKE VMS, RIGHT?
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© 2015 Mesosphere, Inc. All Rights Reserved.
CONTAINERS ARE LIKE VMS, RIGHT?
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© 2015 Mesosphere, Inc. All Rights Reserved.
CONTAINERS ARE LIKE VMS, RIGHT?
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No!
• dependency management for apps
• lightweight: startup time, avg. runtime, footprint
• pets vs cattle
© 2015 Mesosphere, Inc. All Rights Reserved.
CONTAINERS ARE LIKE VMS, RIGHT?
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Pets are individuals that you give names and when they get ill you nurse them back to health.
Cattle are anonymous, identical to other cattle you assign numbers and when they get ill → next one.
http://www.theregister.co.uk/2013/03/18/servers_pets_or_cattle_cern/
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ARE CONTAINERS SECURE?
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© 2015 Mesosphere, Inc. All Rights Reserved.
ARE CONTAINERS SECURE?
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© 2015 Mesosphere, Inc. All Rights Reserved.
ARE CONTAINERS SECURE?
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• containers share same kernel (!)
• namespaces ('user' almost there)
• lock down networking (e.g. Docker's --icc=false)
© 2015 Mesosphere, Inc. All Rights Reserved.
ARE CONTAINERS SECURE?
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Don't bake credentials into Docker images!
Rather do …
$ docker run -d -e API_TOKEN=SECRET somedatabase
$ docker run -d -v $(pwd):/fsecret:/fsecret:ro somedatabase
Ideally, use a key-value (in-memory) store such as
Square's KeyWhiz, HashiCorp's Vault, or Crypt
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SHOULD I REALLY BE USING A CONTAINER ORCHESTRATION TOOL?
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© 2015 Mesosphere, Inc. All Rights Reserved.
SHOULD I REALLY BE USING A CONTAINER ORCHESTRATION TOOL?
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© 2015 Mesosphere, Inc. All Rights Reserved.
SHOULD I REALLY BE USING A CONTAINER ORCHESTRATION TOOL?
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Yes!
• No getting up at 3am to replace a HDD or deploy
an app onto a new server
• Elasticity (traffic, business needs, etc.)
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HOW DO I LAUNCH 100,000 CONTAINERS?
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© 2015 Mesosphere, Inc. All Rights Reserved.
HOW DO I LAUNCH 100,000 CONTAINERS?
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HOW DO I LAUNCH 100,000 CONTAINERS?
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• Are you Google? Facebook? Twitter?• Small is beautiful and containers at scale is hard
• But, what should I use?• For a handful of nodes:
Nomad, Kubernetes, Docker Swarm, Apache Mesos• For ~100 nodes:
Kubernetes, Apache Mesos• For 100s to 1000s nodes:
Apache Mesos
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I ALREADY USE CHEF, PUPPET, ANSIBLE, SALTSTACK, ETC.—DO I REALLY NEED A CONTAINER ORCHESTRATION SYSTEM?
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© 2015 Mesosphere, Inc. All Rights Reserved.
I ALREADY USE CHEF, PUPPET, ANSIBLE, SALTSTACK, ETC.—DO I REALLY NEED A CONTAINER ORCHESTRATION SYSTEM?
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© 2015 Mesosphere, Inc. All Rights Reserved.
I ALREADY USE CHEF, PUPPET, ANSIBLE, SALTSTACK, ETC.—DO I REALLY NEED A CONTAINER ORCHESTRATION SYSTEM?
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• It's really horses for courses• Base provisioning: CM tool of your choice• Container orchestration: Apache Mesos,
Kubernetes, Nomad, Docker Swarm
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CONTAINER ORCHESTRATION, THAT'S FOR MICROSERVICES, OR?
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© 2015 Mesosphere, Inc. All Rights Reserved.
CONTAINER ORCHESTRATION, THAT'S FOR MICROSERVICES, OR?
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• Orthogonal issues …• … however, many (successful) microservices
architectures I've seen are containerized• Worry first about the basics:
• Are you using Git?• Have you got your CI/CD pipeline set up?• How do you deploy your (container) images?
CONTAINER ORCHESTRATION, THAT'S FOR MICROSERVICES, OR?
© 2015 Mesosphere, Inc. All Rights Reserved.
THAT CONTAINER ORCHESTRATION THING THAT'S FOR ON-PREMISES, RIGHT?
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© 2015 Mesosphere, Inc. All Rights Reserved.
THAT CONTAINER ORCHESTRATION THING THAT'S FOR ON-PREMISES, RIGHT?
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• Nope, just different things are important• Think: provisioning (putting a box into a rack vs.
pressing a button)• Actually, many do hybrid cloud (on-premises +
cloud or inter-cloud)
THAT CONTAINER ORCHESTRATION THING THAT'S FOR ON-PREMISES, RIGHT?
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BUT THERE ARE CERTAINLY SOME DOWNSIDES TO IT, I'M SURE!
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© 2015 Mesosphere, Inc. All Rights Reserved.
BUT THERE ARE CERTAINLY SOME DOWNSIDES TO IT, I'M SURE!
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• Mostly challenges of social nature (less people can
take of more stuff)
• Convince your colleagues and boss with:
The Phoenix Project
BUT THERE ARE CERTAINLY SOME DOWNSIDES TO IT, I'M SURE!
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BUT THERE ARE CERTAINLY SOME DOWNSIDES TO IT, I'M SURE!
http://shop.oreilly.com/product/9781939902184.do
http://p24e.io
http://shop.oreilly.com/product/0636920039952.do https://manning.com/books/mesos-in-action
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http://shop.oreilly.com/product/0636920043874.do
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AND NOW IT IS YOUR TURN …
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