Introduction to Docker Containers

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Creating a container

When we call

docker container run

It performs two tasks:

We can create container by

docker container create

We can start container by

docker container start

When we create container from an image, we can specify its configuration. It means we can specify the evironment variables, arguments, name, etc.

Understanding the command run command:

docker container run --rm -it ubuntu:latest /bin/bash

Container configuration


To give a container name use

docker container create --name="my-cool-container" ubuntu:latest


Lables are keyvalue pairs in Dockerfile (image).

We can specify label by using option flag -l or --label.

docker container run --rm -d --name="container-with-label" \
-l deployer=Vikas -l tester=Vikas \


By default the hostname is same as the container id.

We can set the hostname by

docker container run --rm --it \
--hostname="mycontainer" ubuntu:latest /bin/bash

Domain Name Server


Storage volumes

When the default disk space allocated to a container is not appropriate for the job at hand, In these cases we need storage that can persist between container deployments.

In such case we use --mount or -v option. For example,

docker container run --rm --it \
--mount=type=bind,target=/mnt/session_data,source=/data \
ubuntu:latest /bin/bash

You can read more about the bind mount here.

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