Contents
- 1 What are three of the 12-factor app principles?
- 2 Where should you store configuration information in 12 Factor application methodology?
- 3 What is 12 Factor principle in Microservices?
- 4 What is port binding in 12 Factor?
- 5 What does it mean when two environment variables are orthogonal?
- 6 How does the Twelve Factor App Store config?
What are three of the 12-factor app principles?
The following is a brief synopsis of the principles of The 12 Factor App.
- I. Codebase. One codebase tracked in revision control, many deploys.
- II. Dependencies. Explicitly declare and isolate dependencies.
- III. Config.
- IV. Backing Services.
- V. Build, Release, Run.
- VI. Processes.
- VII. Port Binding.
- VIII. Concurrency.
Where should you store configuration information in 12 Factor application methodology?
The 12 Factors
- Codebase – One codebase tracked in revision control, many deploys.
- Dependencies – Explicitly declare and isolate dependencies.
- Configuration – Store config in the environment.
- Backing Services – Treat backing services as attached resources.
- Build, release, run – Strictly separate build and run stages.
What would violate 12-factor app best practices?
Which below would violate 12-factor app best practices? – Explicitly declare and isolate dependencies. – Treat logs as event streams and aggregate logs into a single source. – Keep development, testing, and production as similar as possible.
What is 12 Factor principle in Microservices?
The twelve-factor methodology is a set of twelve best practices to develop applications developed to run as a service. This was originally drafted by Heroku for applications deployed as services on their cloud platform, back in 2011.
What is port binding in 12 Factor?
The twelve-factor app is completely self-contained and does not rely on runtime injection of a webserver into the execution environment to create a web-facing service. This happens entirely in user space, that is, within the app’s code. The contract with the execution environment is binding to a port to serve requests.
How are env VARs managed in a Twelve Factor App?
In a twelve-factor app, env vars are granular controls, each fully orthogonal to other env vars. They are never grouped together as “environments”, but instead are independently managed for each deploy. This is a model that scales up smoothly as the app naturally expands into more deploys over its lifetime.
What does it mean when two environment variables are orthogonal?
‘Orthogonal’ means independent of each other. That implies that no information is duplicated or repeated in two variables, like a server name, and then a connection string that contains the server name. Orthogonal means that environment variables are on different axes of the multidimensional configuration space.
How does the Twelve Factor App Store config?
The twelve-factor app stores config in environment variables (often shortened to env vars or env ). Env vars are easy to change between deploys without changing any code; unlike config files, there is little chance of them being checked into the code repo accidentally; and unlike custom config files,…
What makes an app a violation of the Twelve Factor?
An app’s config is everything that is likely to vary between deploys (staging, production, developer environments, etc). This includes: Apps sometimes store config as constants in the code. This is a violation of twelve-factor, which requires strict separation of config from code. Config varies substantially across deploys, code does not.