A Docker container image is a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system tools, system libraries and settings.
Create docker container with Ubuntu Image
Note: To create docker container, you need to make sure docker is installed on your machine by following “How to install Docker on Ubuntu 18.04 ?”
$ sudo docker create ubuntu:18.04
Once, you see docker container is installed, you can see its container id as,
$ sudo docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 49db5136dac8 ubuntu:18.04 "/bin/bash" 5 seconds ago Created distracted_hamilton
Note: for all below commands “CONTAINER ID” is required, in our case the container id is “49db5136dac8” as can be seen above, please change it to your container id.
Login to docker container shell
To login to docker container, we need to make sure we are running the docker, you can run the docker in background as,
$ sudo docker run -it -d "ubuntu:18.04"
above command will run the docker in background and then you can access the shell as,
$ sudo docker exec -i -t 49db5136dac8 bash
Start the docker container
$ sudo docker start 49db5136dac8 49db5136dac8
once you start the container, you can see the same in “ps” command as,
$ sudo docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 49db5136dac8 ubuntu:18.04 "/bin/bash" 8 minutes ago Up 8 minutes distracted_hamilton
Stop the docker container
$ sudo docker stop 49db5136dac8 49db5136dac8
Delete the docker container
$ sudo docker rm CONTAINER ID
here, you can check which are the all containers available on your machine using,
$ sudo docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 49db5136dac8 56def654ec22 "/bin/bash" 15 minutes ago Exited (0) 6 minutes ago distracted_hamilton 97f8cfdb23d8 56def654ec22 "/bin/bash" 17 minutes ago Exited (0) 15 minutes ago angry_ishizaka 218a9b8c69ef a4a181159e32 "/bin/bash" 2 hours ago Exited (0) 19 minutes ago trusting_franklin
so, here we have 3 containers, of which if we want to delete “49db5136dac8” , we can use the command as,
$ sudo docker rm 49db5136dac8