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CI VS DevOps and other buzzwords (CI/CD Tools (Jenkins (previously Hudson)…

- - - - life before Jenkins
        
        there are more developers building one product (one development team can be in India, second in Nordics, third in USA), all these team upload their pieces of code (commits) into the Code Repository. Developers submit commits irregularly due to time difference, workload, seniority. That´s why there were issues in integration, it caused delay in testing and it ended up like a development hell. In past, developers had to wait until the entire software code was built and tested to check for errors. Because there were no iteration cycles (development - automated tests - finding out bugs).
        
        Once the code/application was finally built, developers then found out there are many bugs and it all had to start almost from the scratch. And of course project could not be handed over to customer/sent to production (live environment). Customer was not very happy about this delay.
        
        What is Jenkins?
        
        Continuous Integration tool that allows continuous development (more developers develop at the same time, coding against the same piece of information), test and deployment of newly created codes.
        
        nightly build and integration (commit changes to the source code only at night), all the changes made to the code are build together. there is a time - same for all countries where developers are asked to pull their code to their single repository and at night all of the code would be run and tested if there are new changes and a new build would be created
        
        also what is used to be before, now with continuous integration, no need to do this, code is pulled whenever there is a commit made to the source code. Your putting your tests and verification services into the build environment, so you are always running cycles to test against your code.
      - you can imagine pipeline like that:
        
        or in video 10:58
  - - - specifically designed for Github hosted projects
- - - - goal - release and deploy - customer gets the application much faster, with no bugs (ideally)