Virtualization and clouds
Nowadays, more and more IT systems are moving into private or public cloud solutions. Clouds allow the more efficient use of resources and movement from smaller to bigger CPU power, memory, or storage capacity instantly.
Clouds can be divided into two forms:
Public clouds: These are clouds hosted by external companies and allow the use of their machines as a service. There are a few public cloud providers that are most popular and commonly used—AWS from Amazon and Azure from Microsoft.
Private clouds: These are setups where the company that wants to use the system also hosts it.
Both have their advantages and disadvantages, and sometimes both types of clouds are used. There are multiple free and commercial technologies to set up private clouds—VMware being a very popular one in enterprise IT infrastructure.
Nagios provides many ready-to-use plugins for various types of clouds. If possible, it is always a good idea to use the already-existing plugins. However, often...
