Docker 101 - Part3 - Persisting data using volumes

In this article, I will explain how to use Docker volumes for persisting data generated by and used by containers with --mount flag. Volumes use the Docker area and it can be found under /var/lib/docker/volumes/ directory of the Docker host.

Example:

docker run -dit --name centos_volume_test --mount source=data_volume01,target=/datavol01 centos sleep 1800

The above command will run a CentOS container and mounts a volume at /datavol01 inside the container. It uses source /var/lib/docker/volumes/data_volume01. The below screenshot shows the necessary steps to verify it.

Hope it was useful. Cheers!

Related posts

Docker 101 - Part2 - Basic operations

Docker 101 - Part1 - Installation

References

https://docs.docker.com/storage/volumes/

https://docs.docker.com/storage/bind-mounts/

Docker 101 - Part1 - Installation

Enter cloud native! In this article, I will briefly explain how to build a virtual Docker host. Here I am installing Docker on a CentOS 7.4 virtual machine running on ESXi 6.5 which is part of a VMware vSAN cluster.

Prerequisites:

• Deploy a basic CentOS 7.4 VM
• Assign IP address and ensure the VM has internet connectivity
• You should have root creds

Installation:

• SSH to the CentOS VM as root
• yum check-update
• yum install -y yum-utils device-mapper-persistent-data lvm2
• yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
• yum install docker-ce
• systemctl start docker
• systemctl enable docker
• systemctl status docker

Verify version:

• docker version

Run your first container:

• docker run hello-world

Hope it was useful. Cheers! In the next part, I will explain basic Docker commands and operations.

Related posts

Docker 101 - Part2 - Basic operations

References

https://docs.docker.com/install/linux/docker-ce/centos/
https://phoenixnap.com/kb/how-to-install-docker-centos-7
https://linuxize.com/post/how-to-install-and-use-docker-on-centos-7/
https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-centos-7