Immutable infrastructure 簡單介紹

1. Immutable Infrastructure
果凍

2. 簡介
● 任職於 inwinstack
○ 過去的迎廣科技雲端應用研發中
心
● python, django, linux,
openstack, docker
● kjellytw at gmail dot com
● http://www.blackwhite.
tw/

3. What’s Immutable Infrastructure
● Infrastructure is divided into "data" and
"other".
● "Other" components are replaced at every
deployment.
● "Other" components are modifed with
version controll.
● "Other" components include “config”,
“program”, “environment”.

4. ● Atomic deployments
○ Easy to upgrade
○ Easy to downgrade
○ Fault recovery
● Operator/technical support will feel happily
because nothing will be changed.

5. Infrastructure
● Deploy tools
● Package your application, dependencies
and configurations together
○ docker
○ packer

6. Downside
● Small changes are cumbersome.
○ Building images will take much time.
● Hard to debug.

7. ● Pros：
○ Without another layer
● Cons：
○ Possibly stay the state you don’t
expect. For example, failed during
upgrading.
Instance
OS
Library
App
server
App
apt: name=foo=1.00 state=present
apt: name=foo state=present
hard to
downgrade

8. ● Pros：
○ Atomic deployments
● Cons：
○ Another layer is needed.
○ Need extra time to build container.
Instance
OS
Container
Library
App
server
App