Getting Started with First Serverless Reweet Function under OpenFaas

Pre-requisite

• Docker Swarm Mode

Pulling OpenFaas

$ git clone https://github.com/openfaas/faas

Deploying OpenFaas Stack

$ cd faas
$ ./deploy_stack.sh

Writing Retweet Function

mkdir -p ~/retweet && \
  cd ~/retweet

The "Retweet" Python function using the CLI:

root@ubuntu18:~/retweet# faas-cli new --lang python retweet
Folder: retweet created.
  ___                   _____           ____
 / _ \ _ __   ___ _ __ |  ___|_ _  __ _/ ___|
| | | | '_ \ / _ \ '_ \| |_ / _` |/ _` \___ \
| |_| | |_) |  __/ | | |  _| (_| | (_| |___) |
 \___/| .__/ \___|_| |_|_|  \__,_|\__,_|____/
      |_|


Function created in folder: retweet
Stack file written: retweet.yml
root@ubuntu18:~/retweet#

This creates 3 major files, 2 of them under retweet and 1 YAML file as shown:

retweet# tree
.
├── retweet.py
└── requirements.txt

0 directories, 2 files

root@ubuntu18:~/retweet# cat retweet.yml
provider:
  name: faas
  gateway: http://127.0.0.1:8080

functions:
  retweet:
    lang: python
    handler: ./retweet
    image: retweet

Building the Function

faas-cli build -f ./retweet.yml

Verifying the Image

docker images | grep retweet
ajeetraina/retweet          latest              027557a5185d        About a minute ago   83MB

Deploying the Retweet Function

faas-cli deploy -f ./retweet.yml
Deploying: retweet.

Deployed. 200 OK.
URL: http://127.0.0.1:8080/function/retweet