sudheer300 – Best DevOps

7.List of 20 docker commands and its use cases with example?

sudheer300 — Thu, 01 Sep 2022 17:37:48 +0000

Docker –version gives the version of docker that’s being used

Docker pull to pull an image from the registry

Docker run to create a container

Docker ps list of running containers

Docker ps –a shows all the running and exited containers

Docker stop stop a running container gracefully

Docker kill stops a running container abruptly

Docker commit creates a new image of an edited container

Docker push used to push an image into the docker hub

Docker images list of images stored locally

Docker rm to delete a stopped container

Docker rmi delete an image from local storage

Docker build builds an image from a dockerfile

Docker start to start a container

Docker restart to restart a stopped container

Docker log to view the logs of a container

Docker inspect to fetch the ip address of a container

Docker exec used to execute commands in a container

Docker rename to rename a container

Docker pause to pause all the processes in a specific container.

6. What is the difference between CMD vs Entrypoint

sudheer300 — Thu, 01 Sep 2022 17:37:01 +0000

CMD is an instruction given in the dockerfile which is executed in the container when the image is run. When two CMD instructions are given in the dockerfile, the latest one is executed.

Entrypoint is similar to CMD except that when more instructions are given all are appended.

Dockerfile should specify at least any one of the CMD or Entrypoint commands.

5.List of dockerfile instructions and its Brief Summary?

sudheer300 — Thu, 01 Sep 2022 17:36:13 +0000

Dockerfile is a simple text file which is a collection of commands and instructions that are used to build a docker image. The Docker build command is used to build docker images using the instructions mentioned in the dockerfile.

4.What is the difference between docker exec and attach?

sudheer300 — Thu, 01 Sep 2022 17:34:45 +0000

Docker exec command is used to access the contents of a container and runs the commands inside the container.

Docker attach command is used to attach our terminal to a running container to view it’s working.

3.What is the difference between docker stop and kill?

sudheer300 — Thu, 01 Sep 2022 17:33:46 +0000

Docker stop stops the running container by gracefully stopping step by step whereas docker kill abruptly stop a running container.

2.What is the differenet between docker pause and unpause?

sudheer300 — Thu, 01 Sep 2022 17:32:55 +0000

Docker pause is used to pause or suspend a running container or containers depending on the input. This puts a pause on all running operation happening at that instance.

Docker unpause simply resumes the operations in the container.

1.Components of Docker and its Brief Summary

sudheer300 — Thu, 01 Sep 2022 17:29:40 +0000

A docker consists of

Docker client which puts up the request for the client in order to perform a request.

Docker host which contains the docker daemon. The requests which are put up by the client are processed here i.e containers are created and images are pulled from docker registry/hub.

Docker registry is the place where the different apps images are stored. These images are pulled to the host where they are processed by creating a container.