Nowadays more and more companies are moving to container-based infrastructure. But nevertheless, virtual machines hold a massive part of the market. For many projects transformation from VMs to containers is a slow and complicated process that cannot be performed at once or even not feasible. Thus the infrastructure management becomes even more challenging while running cloud-native services on container-based platforms and at the same time keeping legacy applications on VMs.
So how to overcome such complexity? The answer is to make VMs and containers co-exist side-by-side within the same infrastructure and be orchestrated by the same platform. In this way, you can host all types of projects using a single point of management and perform transformation gradually based on the current needs and possibilities.
Virtual Machines vs Containers
Before diving any further into VMs and containers merge, let’s cover the main differences between these two virtualization approaches.
- Virtual Machines – is a virtualization type that allows splitting bare metal servers into multiple independent instances with separate operating systems inside. Such virtualization allows to move away from the approach of running one application or service per physical server, as well as to better utilize the evergrowing capacities. However, the necessity in separate operating systems causes additional overhead in memory and storage footprint that leads to extra resource usage. Also, VMs are characterized by the lack of vertical scaling elasticity and relatively long provisioning time.
- Containers – is a next-generation virtualization type that significantly simplifies and speeds up creation of the isolated containers on the physical server. Each container shares the host OS kernel, the binaries and libraries. As a result, containers are exceptionally lightweight and fast to start. Application and system containers allow implementing the microservice principles more efficiently due to its elasticity and easy provisioning.
In short, VMs virtualize hardware to run multiple OS instances, while containers virtualize operating systems so that multiple workloads can run on a single OS. Hosting on virtual machines is commonly used for traditional, monolithic, “all-in-one” applications. While containers are more adopted by cloud-native applications as each service component becomes a separate element in a microservice architecture.
Is it “bad” to work with one type over the other? It is different but most applications can work either way. Containers can offer multiple benefits such as elasticity and efficiency, ease of delivery and simplicity of management. Still many customers keep using applications that were not adopted for the container world. In this case, migrating to a new virtualization model requires a heavy investment in experts, resources and time, which can be economically unprofitable compared to just keeping the already working application as is.
Running Containers and VMs Side by Side
Continuing a freedom of choice philosophy, we added support of traditional VMs to the Jelastic PaaS where they can be run in a perfect union with containers. Thus, you can combine both types of virtualization within the same platform and infrastructure based on your projects’ requirements. This gives more flexibility for the teams to host and manage the applications with cutting-edge technologies in addition to long-present standards and methodologies.
Modernization of legacy monolithic systems is tedious and almost impossible to make it quickly in one go, so it is recommended progressing gradually with enough time to analyze and implement each step. A possibility to run VM and container-based versions of the application on the same infrastructure offers great benefits. For example, when comparing these implementations through tests (performance, resource usage, load handling) or new features analysis (e.g. containers scaling). There is no need to choose blindly when you can check both application types and move forward with the most beneficial option or combine the best sides from each approach.
What Does It Bring for Cloud Hosting Providers?
As a cloud hosting provider, you don’t want to miss customers from the VM and container market segments, so an obvious solution would be to support both virtualization types. However, it is not that simple. The complexity of the orchestration and infrastructure customization scares off most of the dual-hosting enthusiasts. Usually, hosting providers prefer to stick to one type omitting the other one. Some clouds offer support of both virtualization types but actually host them on separate infrastructure and use different orchestration platforms.
Jelastic PaaS has already implemented the possibility to run containers and VMs side by side dissolving boundaries while integrating and maintaining cloud-native and traditional applications. And being designed for service providers, this platform can be smoothly installed on custom bare metal infrastructure to make this hybrid virtualization available for your customers out-of-box.
This flexibility of virtualization choice helps cloud hosting businesses differentiate themselves, find new revenue opportunities and engage more potential users. Ability to mix and match containers with traditional VMs can become a deciding factor for many developers and operational teams while choosing a cloud hosting for their projects.
At the same time, this combined approach can be a great way to fully utilize available infrastructure achieving lower TCO and higher ROI, as there is no need to invest in separate physical servers for VMs and containers. In addition to that, the unified management immensely simplifies the processes requiring less human resources and time investments.
Give a try how a mixed virtualization can be smoothly implemented within your infrastructure. Send request and Jelastic team will provide you with more details and demo access.
Published on Java Code Geeks with permission by Tetiana Fydorenchyk, partner at our JCG program. See the original article here: Containers and VMs Hosted Together on Same Infrastructure and Management Platform
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