Does private cloud have nothing to do with cloud provider like AWS or Azure ?

A private cloud uses organization's own infrastructure. Does that mean it has nothing to do with Cloud provider like AWS, Azure, Google Cloud?

Correct.  Using the cloud means you are using another company's infrastructure and services. They could use them together. For example, the company could mainly use it's own servers, but have a copy in the cloud as a backup or to handle an unusual traffic load.

Al Hobbs wrote:Correct.  Using the cloud means you are using another company's infrastructure and services. They could use them together. For example, the company could mainly use it's own servers, but have a copy in the cloud as a backup or to handle an unusual traffic load.

In this example you mean backup in some cloud like AWS/Azure?

In private cloud, if company uses it's own servers then what is private cloud still called 'cloud'?

if the company has it's own 'cloud' infrastructure, then that would likely mean they also have some kind of automated software for deploying applications that they built or licensed.  If they have their own servers that run things then that would be called on-premise.

In this example you mean backup in some cloud like AWS/Azure?

Yes.  They would have their own setup on-premise then if more resources were needed their backup in AWS or Azure would also be used.

Al Hobbs wrote:.They would have their own setup on-premise then if more resources were needed their backup in AWS or Azure would also be used.

Having that on servers is private cloud, but we don't call having that backup as private cloud and do we call that part has public cloud. Is it so ?

If you are using AWS or Azure then you are using a public cloud.

Thanks. So there are 3 types one can use cloud like cloud :

1) Public cloud-The employees of organization can login to cloud e.g AWS console in case of AWS, and can create resources like EC2,  S3, Glue, Athena. Or create programmatically using cloudformation.

2) Using VPC with Public cloud-Launch EC2, within AWS public cloud. E.g deploy SQL database within this EC2 on subnet or reply your website on this EC2 within subnet. In case it is on private subnet, it will be accessible only using VPC (not on public internet), if it is on public subnet it will be accessible on public internet. That's for a resource deployed on EC2. If it is Glue, S3 etc then we can't deploy this way on EC2 on subnet and it will be simply on public cloud but not on VPC within public cloud.

3)Private cloud-Organization manages this cloud on its servers.

Is this correct ?

sure.
you could mention AWS Outpost.
https://aws.amazon.com/outposts/servers/?nc=sn&loc=0
It allows you to buy a server from amazon and put it on premise but it still has to connect to AWS.

Thanks. Regarding accessing using VPC, the below link says that " Elastic Compute Cloud (EC2), cannot be accessed without an underlying VPC network."

https://www.bmc.com/blogs/aws-vpc-virtual-private-cloud/#:~:text=Amazon's%20Virtual%20Private%20Cloud%20(VPC,running%20in%20the%20AWS%20cloud.

Does that mean that EC2 is such an AWS service which cannot be created without VPC?

When you use aws, the resources you create like EC2 have a default VPC. The VPC allows the instances or other resources to have their own network even though they are in the same server.

So you should combine 1 & 2

Al Hobbs wrote:When you use aws, the resources you create like EC2 have a default VPC. The VPC allows the instances or other resources to have their own network even though they are in the same server.

So you should combine 1 & 2

Thanks.  Does that mean that if EC2 is created, then one is certainly using VPC and never without VPC?


Regarding combining 1 and 2, trying to understand that typically when employees of organizations use cloud like AWS, and create resources there e.g EC2, S3, Athena, Glue, EMR etc, for which resouces it is happening out of these is happening using 'VPC in public cloud" and what for resources s just using public cloud (without VPC)?

one is certainly using VPC and never without VPC?

yes. if you create an EC2 instance you can see the VPC it is in

resources just using public cloud (without VPC)?

AWS has many services available and you would have to look it up

Thanks you had helped me understand this correctly. I was earlier thinking that public cloud usually means fully public. Now I understand that even if it is public cloud, one still would be using  virtual private cloud (either default VPC or a created VPC).

Perhaps, it would be better to think of "commercial cloud" versus private cloud.

A private cloud is something I'd set up on my own (local and/or co-located) servers. Something like OpenStack. General cloud functions, such as defining new virtual machines, setting up applications and services would all be done by me or persons/organizations authorized by me and intended for my specific needs, not as a general service like AWS that just anyone could buy into.

AWS is, of course, very much a commercial cloud. Subject to local restrictions such as the US Office of Foreign Assets Controls and/or Amazon's own preferences, anyone with a credit card can create an Amazon cloud account and set up whatever services they like.

My OpenStack cloud, on the other hand is mine and mine alone. I may provide services to the public (such as an online store, social site, data archive, etc.), just as Amazon does, but they are the services that I define, not services that outsiders can define.

Tim Holloway wrote:

AWS is, of course, very much a commercial cloud. Subject to local restrictions such as the US Office of Foreign Assets Controls and/or Amazon's own preferences, anyone with a credit card can create an Amazon cloud account and set up whatever services they like.

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Yes, and in AWS public cloud also one will use not fully like public cloud but using VPC which will partially give benefit of private cloud.