What is the use of docker exec command?
DOCKER EXEC command is used to run a second command in an already running docker container.
What is the difference between a START and RUN command?
START command is used to start an already created container. On the other hand, a RUN command is used to CREATE and START a non-existing container from a specified image.
So basically a docker RUN command does both CREATE and START commands combined.
> docker run [options] <image_name> [initial_command]
How do you start a docker container?
To start an already created container, we use the below command:
> docker start [options] <container_id> [<container_id> ..]
Where container_id is the unique identifier referring to a created container. This is the value returned when we run a docker create command.
How do you create a container in docker?
A container for a specified image can be created in docker by the below command:
> docker create [options] <image_name> <initial_command>
This command takes an existing docker image name as a parameter and returns a container_id for the created container. This container_id is used for working with the created container
What is meant by an image?
An image is a trimmed down version of operating system along with a specific set of resources pre-installed, which is downloaded from the docker repository and setup in the client machine (our machine) for use. In Docker, an image is used as a base in building a container which contains all the required dependencies along with the environment for the application to run without any hosting issues.
What is meant by a Container?
A container is an encapsulated environment which allows developer to pack all the necessary libraries and dependencies for running an application without any issues and deploy the entire container as an instance.
Docker for Beginners – Docker Container Restart Policies
In a previous article, we have spoken in length about what a docker compose is, and how it can help us in creating customized image builds. let's talk about how we can also further specify how the images when containerized should behave when struck with a termination, aka their "restart" behavior expectations.
Docker for Beginners – Getting Started with Docker Compose
a docker-compose is a command which comes out of the box along with the docker installation, that helps in keeping instructions to run a container out of an image simple without missing out on any instruction which needs to be passed on while creating a container.
Docker for Beginners – Composing and Building a Dockerfile
A Dockerfile is a configuration file which describes the docker runtime on how to build a customized image from an existing base image and how to get things started. It is useful in building exportable containers for applications which can later be used in creating and deploying containerized nodes.
