Derek Collison - qconsf.com€¦ · Orchestrator CF Kernel Hardware - CPU/Memory/Disk/Network...
Transcript of Derek Collison - qconsf.com€¦ · Orchestrator CF Kernel Hardware - CPU/Memory/Disk/Network...
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Derek Collison
Design and Architecture
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What isCloud Foundry?
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The OpenPlatform as a Service
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What is PaaS?
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Or more specifically, aPaaS?
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aPaaS
• Application Platform as a Service
• Applications and Services
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aPaaS
• Application Platform as a Service
• Applications and Services
• Not • VMs
• Memory
• Storage
• Networks
• CPU
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What isOpenPaaS?
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OpenPaaS
• Multi-Language
• Multi-Framework
• Multi-Services
• Multi-Cloud, Multi-IaaS
• Hybrid - Public or Private or Both
• OpenSource
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OpenPaaS
• Multi-Language• Ruby, Java, Scala, Node.js, Erlang, Python, PHP..
• Multi-Framework• Rails, Sinatra, Spring, Grails, Express, Lift
• Multi-Services• MySQL, Postgres, MongoDB, Redis, RabbitMQ
• Multi-Cloud, Multi-IaaS• vSphere, MicroCloud, OpenStack, AWS
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The Open PaaS
Clou
d Pr
ovide
r Int
erfa
ce
Application Service Interface
Private Clouds
PublicClouds
MicroClouds
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Data Services
Other Services
Msg Services
vFabric Postgres
vFabric RabbitMQTM
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What isour Goal?
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What was our Goal?
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Raise the unit of currency to be the application and its associated services,
not the infrastructure
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What was our Goal?
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Best of breed delivery platform for all modern
applications and frameworks
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What was our Goal?
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Favor Choice
and
Openness
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How was it Built?
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How was it Built?
• Kernel (CloudFoundry OSS)• Core PaaS System
• Kernel and Orchestrator Shells• Layered on top of IaaS
• Orchestrator• IaaS creation, management and
orchestration
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High Level
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IaaS
Orchestrator
CF Kernel
Hardware - CPU/Memory/Disk/Network
Clients (VMC, STS, Browser)
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Basic Premises
• Fail Fast
• Self Healing
• Horizontally Scalable Components
• Distributed State
• No Single Point of Failure
• Should be as simple as possible
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Basic Patterns
• Event-Driven
• Asynchronous
• Non-blocking
• Independent, Idempotent
• Message Passing
• Eventually Consistent
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Basic Design
• All components loosely coupled• Few “Classes”, many “Instances”
• Messaging as foundation• Addressing and Component Discovery
• Command and Control
• JSON payloads
• HTTP or File/Blob for data transport
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Kernel Components
• All dynamically discoverable
• Launch and scale in any order
• Can come and go as needed
• Monitor via HTTP and JSON
• Location independent
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Kernel Components
• Router
• CloudController
• DEA
• HealthManager
• Service Provisioning Agent
• Messaging System
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Logical View
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VMC client STS plugin Browser(user app access)
Routers
CloudControllers App
Services
App
HealthManager
DEA Pool
Messaging
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Arc
hit
ec
ture
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Messaging
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Messaging
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“The Nervous System”
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Messaging
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VMC client STS plugin Browser(user app access)
Routers
CloudControllers App
Services
App
HealthManager
DEA Pool
Messaging
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Messaging
• Addressing and Discovery• No static IPs or DNS lookups req’d
• Just Layer 4
• Command and Control
• Central communication system
• Dial tone, fire and forget
• Protects *itself* at all costs
• Idempotent semantics
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Router
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Router
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“Traffic Cop”
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Router
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VMC client STS plugin Browser(user app access)
Routers
CloudControllers App
Services
App
HealthManager
DEA Pool
Messaging
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Router
• Handles all HTTP traffic
• Maintains distributed routing state
• Routes URLs to applications
• Distributes load among instances
• Realtime distributed updates to routing tables from DEAs
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CloudController
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CloudController
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“The King”
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CloudController
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VMC client STS plugin Browser(user app access)
Routers
CloudControllers App
Services
App
HealthManager
DEA Pool
Messaging
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CloudController
• Handles all state transitions
• Deals with users, apps, and services
• Packages and Stages applications
• Binds Services to Applications
• Presents external REST API
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HealthManager
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HealthManager
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“Court Jester”
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HealthManager
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VMC client STS plugin Browser(user app access)
Routers
CloudControllers App
Services
App
HealthManager
DEA Pool
Messaging
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HealthManager
• Monitors the state of the world
• Initial value with realtime delta updates to “intended” vs “real”
• Determines drift
• Complains to the CloudControllers when something is not correct
• No power to change state itself
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DEA
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DEA
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“Droplet Execution Agent”
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DEA
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VMC client STS plugin Browser(user app access)
Routers
CloudControllers App
Services
App
HealthManager
DEA Pool
Messaging
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DEA (Droplet Execution Agent)
• Responsible for running all applications
• Monitors all applications
• CPU, Mem, IO, Threads, Disk, FDs, etc
• All apps look same to DEA• start and stop
• Express ability and desire to run an application• runtimes, options, cluster avoidance, memory/cpu
• Alerts on any change in state of applications
• Provides secure/constrained OS runtime
• Hypervisor, Unix File and User, Linux Containers*
• Single or Multi-Tenant
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How does it allWork?
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Pushing an App
• Client (VMC/STS) pushes meta-data to CC
• Client optionally pushes resource signatures (diff analysis, sys wide)
• Client pushes app resources to CC
• CC puts app together
• CC stages app asynchronously
• CC binds and stages services
• Droplet ready
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Arc
hit
ec
ture
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Running an App
• CC asks DEAs for “help”
• First DEA back wins! Simple
• CC sends start request to selected DEA
• DEA pushes the “green” button
• DEA waits and monitors pid and ephemeral port for app to bind
• When app is healthy, sends “register” message
• Register message is seen by HM and Routers
• Routers bind URL to host:port
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DEAs answer?
• DEAs first determine YES or NO• correct runtime, options, memory, etc
• Then calculate a Delay Taint• SHA hash of application
• memory
• cpu
• Taint allows balancing and selection
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Scale up & down?
• Exact steps as running the app the first time
• SHA1 taint helps avoid clustering
• memory/cpu taint helps distribute as evenly as possible
• Nothing pre-computed
• Nothing assumed
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Crashes?
• If your app stops and we did not tell it to, that is a crash
• Crashed apps are immediately detected by DEA and messaged
• Routers disconnect route instantly
• HM will signal CC• something is wrong
• CC will issue run sequence again52
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Arc
hit
ec
ture
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Access to my App?
• All routers understand where all instances of your application are running
• Will randomly pick backend, not semantically aware.
• Will remove routes that are stale or unhealthy
• Session stickiness and replication available, but best to avoid if possible
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What aboutServices?
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Services
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VMC client STS plugin Browser(user app access)
Routers
CloudControllers App
Services
App
HealthManager
DEA Pool
Messaging
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Services
• Service Advertisement
• Service Provisioning
• Gateway fronts multi-backends
• Service Nodes scale independent
• App and service talk directly
• API to register into system
• Closure for additional value
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Provisioning
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VMC/STS
Routers
CloudControllers Services Gateway
Service NodeMySQL
Service NodeRedis
Service NodeRedis
Messaging
Application
1
2
3
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Access (Direct)
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Routers
CloudControllers Services Gateway
Service NodeMySQL
Service NodeRedis
Service NodeRedis
Messaging
Application
1
2
Browser(user app access)
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Services
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Cloud Foundry
vSphere
core services
Enterprise Services
SQLFire
apps
service controller service broker
provision/bind
consume consume
bind
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