Friday, 26 June 2020
HOW TO SEE A LIST OF IMAGES PRESENT ON THE HOST
In order to see the list of all the docker images and their sizes, run the command - docker images
HOW TO REMOVE A CONTAINER PERMANENTLY
If we want to remove the docker container permanently,
run the command - docker rm (Provide the name of the container or ID)
In the below example, we see that we have 2 exited containers
Now we will delete the 2 exited comtainers:- flamboyant_hodgkin and sleepy_swirles
We can verify if the both the containers are deleted, by running
the command - docker ps -a
HOW TO STOP A RUNNING CONTAINER
If we want to stop the running container running on our system,
run the command :- docker stop (Provide the container name or container id )
We can get the details of the container by running the command - docker ps -a
HOW TO SEE RUNNING DOCKER CONTAINERS
In order to list all the docker containers, run the command - docker ps
Now if we want to see the previous containers which may be stopped or exited, you need
to run the below command:- docker ps -a. Hence we see that we ran a previous container
by the name - whalesay.
Wednesday, 24 June 2020
DOCKER - HOW TO DOWNLOAD DOCKER IMAGE FROM DOCKER HUB
In the below example, we will download the docker image - whalesay from Docker Hub and will run it on the local system. In order to do that run the command:-
docker run docker/whalesay cowsay Hello World!
This would download the docker image - whalesay from Docker Hub and will
display a message - Hello World! as shown below.
How to login into Docker Hub from your local system?
On your local system, type in the command:- docker login
This would prompt you to enter the username and password.
How to install Docker?
1) Go to the URL:- https://get.docker.com/
2) Copy the command and run it on the local system:-
curl -fsSL https://get.docker.com -o get-docker.sh
This command will get the script - get-docker.sh from the above URL and will deposit it to the local system.
3) Now to run the shell script, run the command:- sh get-docker.sh which will start the installation of docker on the local system.
In this example, I am running the command with the root user. If you like to use Docker as a non root user, then we should add our user to the docker group with something like:-
sudo usermod -aG docker youruser
Once the docker is installed, you can check the version by the command:- docker version