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But What About Docker?

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Joshua McKenty
Joshua McKenty

A short-form briefing on containers, PaaS, and the harder problems of infrastructure and application orchestration.

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But what about Docker? Containers and PaaS and VMs, oh my!
What’s a Run-Time Environment? • CPU cycles • Disk I/O • Network access • Other physical resources (GPUs, HBAs)
RTE Criteria • Isolation • Launch speed • Run-time performance But also… • Multi-server orchestration • HA characteristics • Update mechanisms
An ecosystem of tools Process Applications Services Container Virtual Server Bare Metal
Containers (and Docker)
Some Background • Containers started out at Sun in the 90s. • They are an extension of traditional OSlevel isolation primitives, including filesystem ACLs, to control access to shared physical resources. • They have matured with network namespaces and overlay filesystems
Docker: Making containers easy command line tools • Great • Well-integrated overlay filesystems • Well-integrated network management
So… containers via Docker Pros: • Wickedly fast • Simple to deploy • Abstracted from the base OS Cons: • No windows • No *nix • Doesn’t address the hard problems (multiserver, multi-tier, in-place upgrades, or HA)
So why is it so popular!? • UX matters. • UX matters… a LOT. • • • • Built-in emulator for learning. Built-in hosted image repository. Good json output. Really damn easy install.
Micro-OS for Fun and Profit
Micro-OS Ecosystem • • • • • Iocane (Piston Cloud) SmartOS (Joyent) CoreOS (Alex Polvi) OSv (Cloudius Systems) Mirage (XenServer)
Containers and (Micro) OSs App App App App App Container OS OS Container Hypervisor Host OS Physical Server
PaaS
What isn’t PaaS? • It’s not the method of isolation • It’s not the operating system What is PaaS? • Automation of app placement & scaling • Orchestration of services and infrastructure
Understanding PaaS Turning this… .war …into this: .jar LB .tar.gz App App App dependencies libraries service manifest DB Multi-server run time environment(s)
Takeaways
Takeaways • Everything in cloud competes with everything else, at a 40% overlap. • Most PaaS use some kind of process isolation (containers or whatever) internally. • The process isolation isn’t the hard part. • UX matters.

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But What About Docker?

  • 1. But what about Docker? Containers and PaaS and VMs, oh my!
  • 2. What’s a Run-Time Environment? • CPU cycles • Disk I/O • Network access • Other physical resources (GPUs, HBAs)
  • 3. RTE Criteria • Isolation • Launch speed • Run-time performance But also… • Multi-server orchestration • HA characteristics • Update mechanisms
  • 4. An ecosystem of tools Process Applications Services Container Virtual Server Bare Metal
  • 6. Some Background • Containers started out at Sun in the 90s. • They are an extension of traditional OSlevel isolation primitives, including filesystem ACLs, to control access to shared physical resources. • They have matured with network namespaces and overlay filesystems
  • 7. Docker: Making containers easy command line tools • Great • Well-integrated overlay filesystems • Well-integrated network management
  • 8. So… containers via Docker Pros: • Wickedly fast • Simple to deploy • Abstracted from the base OS Cons: • No windows • No *nix • Doesn’t address the hard problems (multiserver, multi-tier, in-place upgrades, or HA)
  • 9. So why is it so popular!? • UX matters. • UX matters… a LOT. • • • • Built-in emulator for learning. Built-in hosted image repository. Good json output. Really damn easy install.
  • 10. Micro-OS for Fun and Profit
  • 11. Micro-OS Ecosystem • • • • • Iocane (Piston Cloud) SmartOS (Joyent) CoreOS (Alex Polvi) OSv (Cloudius Systems) Mirage (XenServer)
  • 12. Containers and (Micro) OSs App App App App App Container OS OS Container Hypervisor Host OS Physical Server
  • 13. PaaS
  • 14. What isn’t PaaS? • It’s not the method of isolation • It’s not the operating system What is PaaS? • Automation of app placement & scaling • Orchestration of services and infrastructure
  • 15. Understanding PaaS Turning this… .war …into this: .jar LB .tar.gz App App App dependencies libraries service manifest DB Multi-server run time environment(s)
  • 17. Takeaways • Everything in cloud competes with everything else, at a 40% overlap. • Most PaaS use some kind of process isolation (containers or whatever) internally. • The process isolation isn’t the hard part. • UX matters.