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Centos is a community-driven free software effort focused on delivering a robust open source ecosystem. How to install centos in vitual-box? cs50.harvard

Docker is a container technology for linux that a developer to package up an application with all of the parts it needs. Installing Docker

Jenkins is a self-contained, open-source automation server which can be used to automate all sorts of tasks such as building, testing and deploying software. Installing Jenkins: download from  here open cmd/terminal and execute : >Java –jar Jenkins.war open browser type  http://localhost:8080  to access Jenkins.