Docker is a common containerization solution that offers a user-friendly interface. It allows you to deploy your application as a lightweight process set rather than a complete virtual machine.
Docker Volume:-
A Docker volume is an independent file system entirely managed by Docker and exists as a normal file or directory on the host, where data is persisted.
Volume is simply a directory made inside our container.
Even if we stop the container still we can access volume.
We can declare a directory as a volume only while creating container.
Cannot create volume for existing container.
Can share the volume across any number of containers.
Benefits of Volume:-
Decoupling container from storage.
Share it among different containers.
On deleting the container the volume does not get deleted.
We can map volume in two ways:-
Container <-> Container
Host <-> Container
Created an EC2 Instance-
Then ssh into the instance-
CREATING VOLUME FROM DOCKER FILE AND MAPPING IT TO ANOTHER CONTAINER:-
sudo su
yum update -y
Install the Docker:-
yum install docker -y
Create a Docker file:-
vi Dockerfile
Write the following inside the Dockerfile
Then create the image from this Dockefile:-
Now create a container with the name cont1 from the image and run:-
Create some files in it:-
Now to share the volume with another container, create a container with a name cont2:-
After creating the cont2, the volume from cont1 would be visible and any changes made in that volume will be visible to both the containers.
_CREATING THE VOLUME USING COMMAND:-
_
Create a new container with name cont3
Create a new container with the name cont4 and share the volume with it.
Create some files inside it and see its present in both the containers.
SHARING VOLUME HOST <-> CONTAINER:-
Verify the files in the /home/ec2-user and run the following command -
Go to that directory and do ls
Create some files in the container in that particular directory
Now check in the EC2 host machine and we can see the files we created now.
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