Docker is the new kid on the block that is rehashing the application development scene in a big way. Why, because unlike VMs and hypervisors which take a lot of memory and file system space for virtualization, docker containers share the kernel resources with all containers. This means there’s no bloated, unwanted code/libraries in your package. You can now focus all your creative energy into getting your application experience right while docker does all the heavy work in the background. It has made application development as easy as Build, Ship, Run. Docker containers do everything else.
The architecture of a docker container is different from that of a Virtual machine instance. A VM abstracts the entire operating system from head to toe. So if you run multiple VMs on a single box, you have multiple such abstractions – result, unwanted loss of memory and infra. Whereas, docker containers package all the necessary files/codes/resources within the container itself and only depends on the shared kernel for execution. This means there’s a substantial decrease in system overload, speed is much faster, applications are responsive and reliability is much more predictable. But all things in life come with a fine line right? Though docker has accelerated DevOps in a big way, there is a limitation with containers in that they run on the same OS only. You can’t have multiple OS emulations on the same box. But when it comes to running more applications on a server, than having more server types, it’s the former that wins and this is why most of the financial companies/ data warehousing/hosting companies are making a beeline to reap savings right from the start. Containers are also safe and secure, they are easier to maintain as well. Docker knowing this partners with other container enterprises like Canonical, Red Hat to build safe and secure containers that are easier to maintain and deploy.
In a day and age where enterprises are struggling to make applications and workloads more portable, Docker introduces a sure fire way to make applications work and run virtually anywhere and without any assistance at all. And the best part, containers love the cloud. So it’s now an easy thing to deploy stuff using containers on the Cloud as well. Docker works with most DevOps applications like Puppet, Chef, Vagrant, Ansible etc. Docker simplifies most tasks that other applications do for example, setting up multiple live servers within a local instance, test projects across different server settings, deploy for multiple operating system etc irrespective of the local host environment.
In closing, Docker just accelerates application development, managing and deploying applications. It helps developers to quickly create and deploy containerized applications on the fly. This would just excite just anyone who’d want to see cost savings go up.