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https://github.com/hamdiz0/learning-devops


https://github.com/hamdiz0/learning-devops

automation aws build-tools cicd devops docker git jenkins kubernetes linux nexus

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README 

        
#                           What is DevOps ?






## `devops is not` :



    - devops is not a tool 

    - not a separate team 

    - not just automation

    - not simply combining Dev and ops teams



    => devops is not just Dev and Ops working together while remaning in thier seperate silos



## `devops is` :



    - devops is based on agile priciples

    - devops is based on CI/CD

    - delevering software in a rapid continuous manner

    - Dev and Ops teams working togther not in seperate silos



    => devops is a "CULTURE CHANGE" in wich Dev and Ops engineers work together during the entire development cycle

    

    => devops is a methodology that integrates software development (Dev) and IT operations (Ops) to improve collaboration, accelerate software delivery, and ensure more reliable system 



#                           [`When to use DevOps ?`]



## `when` :



    - rapid and Frequent Releases (frequent and rapid updates)

    - collaboration and Communication Issues (devops breaks silos and improve collaboration)

    - scalability and Growth (devops work well with cloud-based environment ,automated infrastructure and CI/CD ...)

    - continuous Feedback and Improvement (user feedback helps)

    - complex Systems with High Availability (mission-critical systems where uptime and reliability are essential)

    - microservices Architecture



## `when not` :



    - small, static projects

    - heavily regulated industries with slow change (goverment or medical fields)

    - Legacy Systems with Monolithic Architecture



#                           [`Software Development Roles`]



    - there are different roles in software development & delevery process



## `software development` :



    - software programmed by devs using different programming languages

    - add new features and bug fixes



## `software testing` :



    - test new features and old functionality

    - manual and automated testing

    - done by testers



## `operations (software release)` :



    - build application

    - deploy on servers

    - upgrade existing software

    - done by opertions team



#                            [`traditional : development vs operatons`]



    - different responsabilities

    - different technical knowledge

    - different toolsets



## `development` :



    - focus on implementing  new features fast

        - programming languages

        - test framworks

        - databases

        - version control



## `operations` :



    - focus on maintaining stability

        - os

        - command line

        - scripting

        - monitoring tools



## `this seperation between the development and operation team causes multiple issues` :



    - "well it works on my machine !!!"

    - different responsibilities , different technical knowledge and different tools  

    - this will slow down the release process (weeks to months)



### `misscommunication and lack of collaboration ` :



    - deployment requires configuration and environment needs to be prepared

    - dev team give instructions to the ops team ,these instructions may not be clear enough or some parts are missing



### `conflict of intrest` :



    - DEV focus on realising new features

    - OPS focus on maintaining stability 



### `manual work and checklist` :



    - manual checks : are the system stability and security affected by the new changes 

    - manual deployment

    - manual configuration



#                            [`solution DevOps`]



## `defenition` :



    - devops is the intersection of DEV and OPS

    - a common language to ensure the communication between devs and ops team

    - devops is all about making the process of continious delivery fast and with minimal errors

    - it tries to remove all these roadblocks and things that slow down the release process

    - it helps create fully streamlined automated process for release cycles



## `devops as a seperate role` :



    - devops become an acual role : "devops engineer"

    - devops tools : set of technologies used to implement devops

    - a devops engineer is responsible for creating a streamlined fully automated release process

    - basic knowledge of the development and operation and additional devops specific skills



## `famous devops tools` :






    - source code manegment : git

    - package management : docker

    - infratructure as code : terraform ,ansible

    - CI/CD : jenkins ,git web service

    - container orchestration : kubernetes

    - cloud : aws ,azure ,google cloud

    - monitoring : prometheus



#                            [`waterfall vs agile methedologie`]



## `waterfall` :



    - requirements : planning

    - development : code complete app

    - testing : testing the hole app

    - operations : huge preparation

    => this an ineffective process :

        - over time new requirements may arise

        - miscommunication and places of faliure

        - lack of fast feedback



## `agile` :



    - agile is the heart of CI/CD process

    - devops implements some best practices of the agile method

    - backlog => analyse => define => design => test => deploy

    => this method is effective and its increasingly growing :

        - speed of development , testing and deployment cycles

        - each feature gets tested , deployed and gets immediate feedback

        - fast development and deployment process

        - scrum and kanban (examples of specific implementations)

    



#                            [`at the core of devops`]



    - CI/CD pipline for an automated release process

    - commit code => test => build => push => deploy