Difference between revisions of "Clusters in CNM Farms"
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:Backups are used to restore the data, but they cannot prevent work interruptions. Imagine that you are in the middle of exam or another project at [[Opplet]]. If its [[computing server]] fails, you should wait until the latest backup is restored. Plus, your latest data, most likely, would be lost. | :Backups are used to restore the data, but they cannot prevent work interruptions. Imagine that you are in the middle of exam or another project at [[Opplet]]. If its [[computing server]] fails, you should wait until the latest backup is restored. Plus, your latest data, most likely, would be lost. | ||
| − | :To make [[Opplet]] stable, [[ | + | :To make [[Opplet]] stable, [[CNM Fed Farm]], [[CNM Bureau Farm]], and [[CNM HandsOn Farm|HandsOn Farm]] are run in [[computing cluster]]s. Each cluster includes two or more identically-functioning ''servers''. If one of them fails or is not available, another would continue running. This feature of the [[CNM Farms]] is called [[redundancy]]. |
:Special [[load balancer]]s make sure that the ''servers'' in one ''cluster'' work synchronously to cover for each other and the ''Cloud'' users access the ''server'' that serves them best. | :Special [[load balancer]]s make sure that the ''servers'' in one ''cluster'' work synchronously to cover for each other and the ''Cloud'' users access the ''server'' that serves them best. | ||
Latest revision as of 14:06, 11 December 2023
Clusters in CNM Farms (hereinafter, the Lectio) is the lesson part of the CNM Farm Essentials lesson that introduces its participants to Opplet. This lesson belongs to the Introduction to CNM Cloud session of EmployableU Concepts.
Content
The predecessor lectio is Data at CNM Farms.
Script
- Backups are used to restore the data, but they cannot prevent work interruptions. Imagine that you are in the middle of exam or another project at Opplet. If its computing server fails, you should wait until the latest backup is restored. Plus, your latest data, most likely, would be lost.
- To make Opplet stable, CNM Fed Farm, CNM Bureau Farm, and HandsOn Farm are run in computing clusters. Each cluster includes two or more identically-functioning servers. If one of them fails or is not available, another would continue running. This feature of the CNM Farms is called redundancy.
- Special load balancers make sure that the servers in one cluster work synchronously to cover for each other and the Cloud users access the server that serves them best.
- No user, but the Farms administrators, can detect that feature. Any cluster acts as a single computing server; only an emergency can possibly help to identify the Cloud's redundancies.
- To accommodate experiments of CNMCyber Team, CNM Lab Farm is more flexible than the other, more conservative, parts. Depending on the experiments' nature, this part of the Farms may have any number of server clusters or no clusters at all.
Key terms
Closing
- Is the concept of computing clusters and redundancy explained well?--- Yes/No/I'm not sure
What the Middleware Is is the successor lectio.
