Vagrant or Docker which one is better to use to create an isolated environment?
The short answer is that if you want to manage machines, you should use Vagrant. And if you want to build and run applications environments, you should use Docker.
Vagrant is a virtual machine director, it permits you to script the virtual machine arrangement and additionally the provisioning. Be as it may, it is still a virtual machine contingent upon Virtual Box (or others) with a tremendous overhead. It obliges you to have a hard drive document that can be enormous, it takes a considerable measure of ram, and execution might be bad.
Docker then again utilizes bit cgroup and namespacing by means of lxc. It implies that you are utilizing the same piece as the host and the same record framework. You can utilize Dockerfile with the docker manufacture summon so as to handle the provisioning and design of your holder.