Docker Volumes:
Docker gives feature called volume, to share the data between networks.
there are two varieties
- Persistent – Store the data perminently even container stopped, the data will be exists.
- Ephemeral – Temp data, if container stopped, the data will be no longer available.
Share Folder with the host:
- “Shared folders” with the host.
- Sharing a file into a container.
- Data will be available even container stopped.
Example for Persistent:
Step 1: open “Docker Quickstart Terminal”
Step 2: running on linux host
docker-machine ssh
Step 3: create a new folder named as “drtuts”
mkdir drtuts
Step 4: find out the complete path of the folder.
pwd
Step 5:
docker run --rm -ti -v /home/docker/drtuts:/shared-folder ubuntu bash
Step 6: go to Shared-folder
cd shared-folder
Step 7: creating new data which is going to share to docker machine.
touch my-data-file
Step 8: exit container
exit
Step 9: go to “drtuts”
cd /home/docker/drtuts
Step 10: list out all the files
ls
Note: if you exist the container & linux host, the file still be available in the host.
Sharing data between containers:
volumes-from attributes helps to share data between containers.
Shared “Discs” that exists only as long as they are being used.
Its common for the containers which being used
Examples:
Step 1: open “Docker Quickstart Terminal”
Step 1: Start container with created new shared folder between containers.
docker run --rm -ti -v /share-data ubuntu bash
Step 2: Create a new file named as Vijay within share-data folder.
echo Vijay > /share-data/vijay-file
Step 3: Start another container using another “Docker Quickstart Terminal” which refers share-data folder.
docker run --rm -ti --volumes-from /share-data ubuntu bash
Step 4: go to Share-data folder
cd share-data
Step 5: List out all the files
ls
Now the share-data folder is shared between containers, where you can share the data between containers using this directory. But its available as long as those containers being used.
The post Docker Volumes appeared first on Drtuts.
