Randstad Docker meetup - Serverless

Copyright © 2019, Oracle and/or its affiliates. All rights reserved. |
Fn Project
Randstad Docker meetup
1
David Delabassee - @delabassee
Oracle
January 30, 2019

Copyright © 2019, Oracle and/or its affiliates. All rights reserved. 2
Preamble…

Copyright © 2019, Oracle and/or its affiliates. All rights reserved.
Safe Harbor Statement
The following is intended to outline our general product direction. It is intended for
information purposes only, and may not be incorporated into any contract. It is not a
commitment to deliver any material, code, or functionality, and should not be relied upon
in making purchasing decisions. The development, release, and timing of any features or
functionality described for Oracle’s products remains at the sole discretion of Oracle.
4

Function As a Service
• Function
• As a Service
5
Small bits of code with a well defined job
Easy to understand and maintain
The system takes care of provisioning, patching, scaling, ...
Each function can scale independently

https://jaxenter.com/technologies-dominate-2019-poll-152470.html

https://twitter.com/monkchips/status/1088002995525242880

Coming Soon: Oracle Functions
8
Autonomous
Platform auto-scales functions
No servers to provision,
manage
Pay Per Use
Pay for execution, not for idle
time
No Lock-in
Built on open-source Fn
Project and Docker
Oracle Functions
Functions-as-a-Service
Oracle Cloud Integrated
Container Native
Multi-tenant
Secure
Open Source Engine

FaaS Platform – Roles & Responsibilities
9
Users Provider

Open-Source Container-Native FaaS Platform
Introducing Fn Project
https://github.com/fnproject

The Ideal FaaS Platform?
Open-Source
Approachable
Container-Native
Language Independent
Scheduler Independent
Platform Independent
No vendor lock-in
Easy for new users
Leverage Docker and its ecosystem
Go, Java, Python, …
K8S, Swarm, Mesos, ...
Cloud, On-Perm, laptop

Fn Architecture
• Fn CLI
• Fn FDK's

Introducing Fn Function
Code wrapped in a Container Image
–Via a “wrapper”
• Input from stdin
• Output to stdout
• Logs to stderr
–Or simply use an FDK!
Fn handles everything else!

Fn and java
14

Fn … not just Java
15
• Go
• Python
• Node
• Ruby
• …
• bring your own!
– Init-image

fn deploy
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• Build container (multi-stage) + bumps version
• Push container to registry (unless --local)
• Create or update function trigger
SomeFunc:0.0.1
SomeFunc:0.0.1 SomeFunc:0.0.1
User code
Fn Service
somefunc →
/r/app/somefunc:0.0.1

Fn Triggers
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• Entry points for function invocation
• Multiple triggers may call the same function
• HTTP trigger, more coming
$ fn init --runtime node --trigger http hello
…
$ fn list triggers nodeapp
FUNCTION NAME TYPE SOURCE ENDPOINT
hello my-trigger http /hi http://10.8.10.103/t/nodeapp/hello

Logging
18
syslog & logspout

Fn and Developers
19
• Strong Developer Focus
– E.g. keep using your preferred tool chain
• FDK
• Fn CLI
# fn init
# fn build (optional)
# fn deploy
# fn invoke

DIY Serverless
20
• Roles & Responsibilities
– Users and Provider
• Why?
– Don’t Lean into Lock-in, Open is Good, Flexibility is Great
– Specific requirement, e.g. local legislation
– More controls and customization
– Learning, Development, etc.

DIY Serverless
21
• Requirements
– Fn Project
– Kubernetes
– Infrastructure
– DevOps Ninja Skills

DIY Serverless
22
• Scheduler Agnostic
– Optimizations and additional management work underway for K8S
• Helm chart
– https://github.com/fnproject/fn-helm

DIY Serverless
23
• Requirements
– Fn Project
– Kubernetes
– DevOps Ninja Skills
Oracle Container Engine
for Kubernetes

Observability and Analytics with Prometheus & Grafana
24

Tracing with OpenTracing and Jaeger
25

Customizing and Extending Fn
26
• Listeners
– App, Call, Fn and Trigger listeners
– Can listen to various API events and respond to them
• Middleware
– Add functionality for every API request
– Cancel the request or call the next middleware in the chain
– E.g. Authentication middleware that checks headers for a custom token
• Custom API endpoint
– E.g. Custom API endpoint that handles requests to a custom HTTP route

Low Latency
• Hot Functions
• Start Fast
• Run Small(er) images
27

Fn Hot functions
28
• Cold start time (~300ms) is incurred on a first invocation
• Fn will pause the container for a time, default 30s
• Subsequent invocations will be “hot”, and reset the cooldown

Start Fast
29
E.g. Java - Moving Startup Costs to Build-Time
• Class Data Sharing
–Avoid parsing JDK classes on start
• Application CDS
–Avoid parsing App classes on start
• AOT compilation
–Compile App classes to native .so libraries (experimental)

Run Small(er) Images
Small container images = faster start-up
–Transferring images to a host
–COW caches
–Overlay FS
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E.g. Java - Better start-up time

31
Remove parts of Java standard library that you don't use
Function and its dependencies
Java runtime
Operating System
Java 11 vs. Java 11 with jlink

Security-oriented, lightweight Linux distribution
with 4MB base image
Lightweight, fast, simple, free, C standard library
implementation
32
E.g. Java
Project Portola’s goal is to run the JVM on Alpine Linux/Musl

• GraalVM compiles Java source to a single native binary
• Tiny image sizes
• Low VM overhead
33
E.g. Java

Fn Project
• Open Source Container Native FaaS Platform
–https://github.com/fnproject
• Development choices
–Go, Java, Node, Python, etc.
• Operation choices
–DIY Serverless
– ➥ Oracle Container Engine for Kubernetes + Fn
–➥ FaaS, i.e. Oracle Functions (soon)
34
Wrap-up

Coming Soon: Oracle Functions
Function Dev KitsOpen Source Engine
Oracle Cloud Triggers
Events
HTTP
Timer
Streams
Container Native
Advanced DiagnosticsFine-grained Billing

Dank u!

https://cloud.oracle.com/TryIt
Get $500 USD of free credits

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Randstad Docker meetup - Serverless