Immutable infrastructure：觀念與實作 (建議)

#JCConf

William Yeh

#JCConf

William Yeh

immutable infrastructure”


#JCConf

William Yeh

#JCConf

William Yeh

http://s

end.wtf/

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#JCConf

im‧mutable

im‧mutable

#JCConf

Entropy

Entropy

#JCConf

#JCConf

Q:

7%

A:

lysosomes

#JCConf

#JCConf

#JCConf

DNA

#JCConf

DNA

#JCConf

DNA

lysosomes

#JCConf

DNA

lysosomes

#JCConf

How about computers?

Entropy?

#JCConf

“HAProxy has been installed on Linux 2.4 systems serving millions of pages every day, and which have only known one reboot in 3 years for a complete OS upgrade.”

Reliability - keeping high-traffic sites online since 2002

“HAProxy has been installed on Linux 2.4 systems serving millions of pages every day, and which have only known one reboot in 3 years for a complete OS upgrade.”

Reliability - keeping high-traffic sites online since 2002

im‧mutable

im‧mutable

im‧mutable

im‧mutable

In OOP and FP, an immutable object is an object whose state cannot be modified after it is created.

immutable objects

JCConf 2015Universal Scalaby Walter Chang

In OOP and FP, an immutable object is an object whose state cannot be modified after it is created.

String s = "ABC";s.toLowerCase();

immutable objects

String s = "ABC";s.toLowerCase();

Why immutable objects?• simpler to understand• inherently thread-safe• offer higher security than mutable objects.

immutable objects

“How to sort in-place using the merge sort algorithm?”

immutable objects algorithms

• Too complex to be reduced to practical program.

• Knuth left this as an exercise (Vol 3, 5.2.5). There do exists in-place merge sort. It must be implemented carefully.

http://stackoverflow.com/q/2571049/714426

CTAS: Create Table As Select


• Faster than ALTER TABLE.

• … with some constraints… Google it!

http://stackoverflow.com/q/2571049/714426

databases

DHH (David Heinemeier Hansson)Creator of Rails.

immutable objects algorithms databases applications


http://smalltalk.xdite.net/posts/302780-bos-rewrite-from-dhh

databases applications




databases applications


immutable

infrastructure


immutable

infrastructure


Let’s talk about

immutable objects algorithms databases applications Java

hot swap? hot deploy?


hot swap since JDK 1.4


hot swap in JRebel


hot swap in OSGi


Christian PostaPrincipal Middleware Specialist/Architect at Red Hat, open-source enthusiast, committer on Apache ActiveMQ, Apache Camel, Fabric8, HawtIO, blogging, Family, India Pale Ale.

http://blog.christianposta.com/immutable/immutable-infrastructure-and-the-jvm-part-i/



• Don’t hotdeploy/redeploy/migrate your Java services in production at runtime.





• Don’t hotdeploy/redeploy/migrate your Java services in production at runtime.

• Do have a very strong focus on your delivery pipeline/automation/testing to quickly make changes to your system.




Infra

Infra


immutable

infrastructure

defin

ition

http://www.slideshare.net/jpetazzo/containerization-new-virtualization-docker-separation-operational-concerns

Jérôme Petazzoni

defin

ition


Jérôme Petazzoni

defin

ition


Jérôme Petazzoni

defin

ition


Jérôme Petazzoni

defin

ition

WHY immutable infra?

WHY immutable infra?• Simplify change management• hard to keep or restore “desired state” in-place


• Enforce dev/prod parity• configure & test infra before deployed to

production environment


• Enforce dev/prod parity• configure & test infra before deployed to

production environment• Reason about apps at a higher level • … than just the deployable packages containing

the code (JAR/WAR/zip/MSI/whatever)

WHY NOT immutable infra?

WHY NOT immutable infra?• Cost of “out of place” may be too high• vs

WHY NOT immutable infra?• Cost of “out of place” may be too high• vs

• DevOps maturity level• Orchestration and

resource allocationprimitivesare required

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#JCConf

#JCConf

#JCConf

Golden imagePhenix server

VM image


VM imageContainer image


VM imageContainer imageUnikernel image


VM image Container imageUnikernel image

• VM/IaaS provider specific

• VM/IaaS provider agnostic• Ansible: https://github.com/ansible/ansible• Packer: https://www.packer.io/• Otto: https://ottoproject.io/


Unikernel image

• Docker ecosystem• docker cli• Docker Hub• CI: Jenkins, Travis CI, CircleCI…

• Pre-Docker tools• Packer: https://www.packer.io/


Unikernel image

VM

VM Docker

Docker

Container per VMDockerHyper: https://hyper.sh/

Container per VMHyper: https://hyper.sh/


UnikernelBoxfuse: https://boxfuse.com

https://boxfuse.com



Unikernels are constructed by using “library operating systems,” from which the developer selects only the minimal set of services required for an application to run.

These sealed, fixed-purpose images run directly on a hypervisor without an intervening guest OS such as Linux.

https://boxfuse.com


Container per VM

https://boxfuse.com

#JCConf


Unikernel image

new unikernel approach


Unikernel image

new unikernel approach

#JCConf



#JCConf

deployment

deployment

deployment

• Rolling upgrade• Blue/green deployment• Canary deployment

deployment

https://www.safaribooksonline.com/library/view/continuous-delivery/9780134389363/

deployment

• Cluster management• Service discovery• Orchestration

deployment

• Pets vs cattle• Docker ecosystem is easier…

• Kubernetes• Mesos• …

#JCConf

DevOps

deployment

DevOps

deployment


deployment


DevOps

IT workflow automation

deployment


DevOps

JCConf 2015,

Abola Lee

IT workflow automation

deployment


DevOps

JCConf 2015,

Abola Lee

IT workflow automation• Platform-specific tools

• AWS CodeDeploy• Google Cloud Deployment Manager• IBM BlueMix

deployment


DevOps

JCConf 2015,

Abola Lee



• Ansible

deployment


DevOps

JCConf 2015,

Abola Lee



• Ansible• CI SaaS

• Travis CI, CircleCI, etc.

deployment


DevOps

JCConf 2015,

Abola Lee



• Ansible• CI SaaS

• Travis CI, CircleCI, etc.• Atlas (and others from HashiCorp)

Entropy

#JCConf

#JCConf

DNA

#JCConf

DNA

#JCConf

DNA

lysosomes

#JCConf

DNA

lysosomes

#JCConf


#JCConf


#JCConf

deployment


#JCConf

deployment


#JCConf

#JCConf

William Yeh

http://s

end.wtf/

jcconf20

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Software

Immutable infrastructure：觀念與實作 (建議)