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.