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Stefen
Stefen

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ELT Airflow Pipeline Project

#airflow #pipeline #etl

About

Project using data engineering concepts.

The project is an ELT (Extract, Load, Transform) data pipeline, orchestrated with Apache Airflow through Docker containers.

Faker is used as a package to generate data to a mysql database. The data is extracted from mysql, transformed with pandas and Sql and then loaded into an Olap postgres database. A notification is then sent by email once the whole process is completed.

Architecture

Prerequisites

Setup mailtrap

One platform toTest, Send, Control your emails:

Setup

Clone the project to your desired location:

$ git clone https://github.com/Stefen-Taime/airflow_etl.git
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fill the AIRFLOW_SMTPSMTP_USER, AIRFLOWSMTPSMTP_PASSWORD, AIRFLOWSMTP_SMTP_MAIL_FROM in .envExample file:

AIRFLOW_ADMIN_MAIL=airflow
AIRFLOW_ADMIN_FIRSTNAME=airflow
AIRFLOW_ADMIN_NAME=airflow
AIRFLOW_ADMIN_PASSWORD=airflowpassword
AIRFLOW__CORE__LOAD_DEFAULT_CONNECTIONS=False
AIRFLOW__CORE__SQL_ALCHEMY_CONN=postgres+psycopg2://airflow:airflowpassword@postgres:5432/airflow
AIRFLOW__CORE__FERNET_KEY=81HqDtbqAywKSOumSha3BhWNOdQ26slT6K0YaZeZyPs=
AIRFLOW_CONN_METADATA_DB=postgres+psycopg2://airflow:airflowpassword@postgres:5432/airflow
AIRFLOW_VAR__METADATA_DB_SCHEMA=airflow
AIRFLOW__SCHEDULER__SCHEDULER_HEARTBEAT_SEC=5
AIRFLOW__CORE__EXECUTOR=LocalExecutor
AIRFLOW__SMTP__SMTP_HOST=smtp.mailtrap.io
AIRFLOW__SMTP__SMTP_PORT=2525
AIRFLOW__SMTP__SMTP_USER=xxxxxxxxxxx
AIRFLOW__SMTP__SMTP_PASSWORD=xxxxxxx
AIRFLOW__SMTP__SMTP_MAIL_FROM=your_email@gmail.com
AIRFLOW__WEBSERVER__BASE_URL=http://localhost:8080
POSTGRES_USER=airflow
POSTGRES_PASSWORD=airflowpassword
POSTGRES_DB=airflow
AIRFLOW_UID=1000
AIRFLOW_GID=0
AIRFLOW_UID=1000
AIRFLOW_GID=0
AIRFLOW_UID=1000
AIRFLOW_GID=0
PG_VER=14-alpine
POSTGRES_SRC_PASSWORD=Sup3rS3c3t
PORT=5432
POSTGRES_USER_OLAP=postgres
HOSTNAME=olap
ONTAINER_NAME=postgres
POSTGRES_DB_OLAP=postgres
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grant permissions to the bash script:

chmod a+x build_Services.sh
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Bash:

$ ./build_Services.sh
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Build Docker:

$ docker-compose up --build -d
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When everything is done, you can check all the containers running:

$ docker ps
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oltp Interface

Now you can access adminer web interface by going to http://localhost:8085 with the default user which is in the docker-compose.yml:

Système     MySQL

Serveur     oltp

user        root

password    myrootpassword


Database    testdb
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olap Interface

Now you can access new adminer web interface by going to http://localhost:8085 with the default user which is in the docker-compose.yml:

Système     PostgesSQL

Serveur     olap

user        postgres

password    Sup3rS3c3t


Database    postgres
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Airflow Interface

Now you can access Airflow web interface by going to http://localhost:8080 with the default user which is in the docker-compose.yml. Username/Password: airflow/airflowpassword:

Airflow DAG

Now you can run Airflow etl dag:

Check oltp and olap database

:)

Check your mailtrap.io/inboxes

Shut down or restart Airflow

If you need to make changes or shut down:

$ docker-compose down
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References

https://medium.com/@stefentaime_10958/elt-airflow-pipeline-project-dcf834c1be17

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