Overall

Question 1

[Deployment] canary (khh’ neh ree) deployment

Allow A/B testing via network paritition

Answer 1

slowly rolling out the change to a small subset of users before rolling it out to the entire infrastructure and making it available to everybody

By Network partition
E.g. West coast–> central –> east coast

Question 2

[Deployment] Blue(staging)-green(prod) deployment

Answer 2

two duplicate set of VMs one for blue one for green (one as staging and one as production)

deployment is toggle between staging and production.

Question 3

[Deployment] Rolling deployment

Answer 3

Deploy to 1/N of VMs at at time (with traffic still LB)

Question 4

cross-cutting concerns
Example
for an application, the logging, security, network are cross-cutting concerns (that affect all parts of an application)

Answer 4

In aspect-oriented software development, cross-cutting concerns is a concern which is applicable throughout the application and it affects the entire application

Exampl