1.When a docker machine is integrated with jenkins after running a build it shows unstable for that how you can make trouble shoot? To avoid these permission issues run the following command sudo chmod 666 /var/run/docker.sock 2.What is docker? Docker it is a tool designed to make it easier to create, deploy, and run applications by using containers. 3.What is docker file? A Dockerfile is a text document it contains all the commands a user could call on the command line to assemble an image. 4.what is docker image? Docker images are executable packages that include everything needed to run an application — the code, a runtime, libraries, environment variables, and configuration files. 5.what is container? container it is nothing but a running state of image 6.Docker commands