Kubernetes vs Oracle VM VirtualBox

• Makes sure that the workload remains UP & running by maintaining the desired state.
• Gives a lot of flexibility in choosing the networking, storage, monitoring, etc solutions of your choice.
• The biggest advantage is to upgrade the application with a new version without any downtime.
• Portability of the code is possible up to a great extent.

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• It is simple to install - there is no advanced knowledge required to begin building virtual computers
• It is easy to use - adding new virtual machines is simple with wizard-based deployment
• It enables easy portability - moving virtual machines from one host to another is straight-forward and simple
• It is free

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• We had several problems with its NFS, which is responsible for syncing the code across the cluster
• On several instances the pods go into UNKNOWN state in which case restarting the entire node is the only solution
• As a user of the existing setup given to me, I wasn't able to allocate only some CPU cores on a single host. It was either all or zero making cluster utilization sub-optimal

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• I have had issues in the past when it has come to resizing VM disk storage. The issue is entirely detailed here: https://www.virtualbox.org/ticket/9103 -- the problem was caused because of having existing snapshots (which error message output was not detailing). I haven't had to deal with the issue due to my dynamic disk sizes not being small from the start anymore (this is mostly an issue for my Windows VMs where the base disk may need significant size for the OS). It looks like, for a resize, that a merge of all snapshots has to occur first -- one user on that list details a workaround to maintain snapshots by cloning the VM. (Note: 5.2 was just released a few weeks ago, and looks like it should prevent the problem happening in the future by properly informing users that it isn't possible with snapshots).
• Certain scenarios, like resizing disks, required dropping into a terminal as there were no options to previously do so via the GUI. According to some recent posts, I've seen that v5.2 has added disk management stuff like that to the GUI (or will be adding it). I'm comfortable with dropping into the terminal, but in a teaching scenario or when evaluating the learnability of the tools, it complicates things.

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• Because of microservices, Kubernetes makes it easy to find the cost of each application easily.
• Like every new technology, initially, it took more resources to educate ourselves but over a period of time, I believe it's going to be worth it.

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• For personal use, there is no monetary investment, I am running 5 CentOS servers flawlessly in my home lab.
• Saves a ton of money in an enterprise environment by not having to purchase physical test servers. (Cost of Enterprise product is way lower vs Cost of standing up physical servers and/or cloud servers)
• Makes virtualization very easy and friendly for everyone for test instances.

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