Basics: Docker Containers Vs Virtual machines (VMs)

Docker Containers Vs Virtual machines (VMs)

Virtual machines and containers are both forms of virtualization, but they differ in their strategies and the amount of abstraction they offer..

With the help of virtual machines (VMs), the underlying hardware may be completely virtualized, allowing many separate operating systems to coexist on the same physical host. Each virtual machine (VM) is equipped with a unique operating system and set of resources (CPU, memory, storage, etc.). Higher isolation and security are the results, but more setup time and resources are needed.

On the other hand, containers execute separate processes in user space while sharing the host operating system's kernel. Modern, dynamic application deployment infrastructures are ideally suited for containers since they are smaller in weight and more quickly built and destroyed than virtual machines (VMs). As they share the host OS kernel, containers offer less isolation and security than virtual machines (VMs).

Fig 1.1-  Docker Containers Vs Virtual machines (VMs)

Conclusion
In conclusion, containers are better suited for applications that demand quick deployment, little resource usage, and high mobility, whereas VMs are preferable for applications that require total isolation and a full virtualization of the underlying hardware.

Compared to virtual machines, which offer a better level of protection but need a longer deployment and more overhead, containers are effective, quick to install, and portable but offer less security.

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