One IP for many servers?

somed3v3loper

somed3v3loper

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Hello all ,

Title might not be clear so here it is in detail:

How do many websites and online games have one address or maybe ip for their servers that are spread all over the world ?

Can we do the same using B4J ?

And what exactly do we need ?

If they are not having the same IP , how are they managing their scattered content ?

Thanks in advance
 
DonManfred

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See the Documentation of Apache server for example.

In apache you can create virtual-hosts (www.domainY.com) beside your normal web (www.domainX.com). the virtual host-list will be consulted if someone send a request to this server and apache will know where to find the files to deliver to the requesting httprequest.

I dont know whether it is possible with b4j or not
 
Ormente

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As Manfred said, on a server an IP can "serve" different sites (called virtual hosts). The "routing" is based on the domain, which is part of the request.

Usually an IP targets ONE machine... but that's not exactly true (think about the IP your ISP assign to you, and the multiple devices you can have on your local network "behind" the public IP).

What you are refering to, i think, is another fact : one domain (and related adresses) can resolve to different IPs. It' quite commonly used for load balancing.
See this page for example.

As for B4X, I have no answer: i'm just starting to explore this world.
 
somed3v3loper

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Can something like this help?
Modified a code from Erel post in Creating Proxy thread.
B4X: 
Sub Handle(req As ServletRequest, resp As ServletResponse)
mResp = resp
'Ping a list of IPs
StartMessageLoop 
End Sub

Sub ping _result
'mresp redirect the user to best ping server
Stopmessageloop
End sub
 
S

sorex

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just check the http header's host value then you know which (website) directory should be used to fetch data.
 
LucaMs

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Erel said:
What exactly are you trying to do?

Do you want to use the same ip address for multiple sites or servers?
Click to expand...

I'm not sure of what he needs, but I try to describe a scenario.

Suppose that one day I'll publish my app (this is pure fiction :D).

Suppone also that a unique b4j server will not be enough (too many clients).

I decide to install 2 b4j servers on one or two VPS.

How can I get that:

1) all the clients point to a single IP address;
2) users are "managed from a single DB" or from two DBs, but in a way that users can "communicate" as if there were a single DB and a single B4J server.
 
Erel

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LucaMs said:
Suppone also that a unique b4j server will not be enough (too many clients).
Click to expand...
The truth is that it is unlikely that a single server will not be enough. See the performance numbers I posted. A B4J server running on a regular computer can handle 2000+ requests per second.

If a single server is not enough then you need to use a load balancer. The user sends the first request to the load balancer (which you can implement in B4J) and the load balancer redirects the request to one of the other computers.
This is for example how the B4i builders work.
 
LucaMs

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Erel said:
The truth is that it is unlikely that a single server will not be enough. See the performance numbers I posted. A B4J server running on a regular computer can handle 2000+ requests per second.
Click to expand...
I knew that tests; it will not be my case, but I saw an online multiplayer card game (like mine SHOULD be :D) which had 85,000 users connected at the same time (at least they claim this).

Erel said:
If a single server is not enough then you need to use a load balancer. The user sends the first request to the load balancer (which you can implement in B4J)
Click to expand...
First I have to discover what is a "balancer" :D (I'll search).

Many thanks, Erel
 
somed3v3loper

somed3v3loper

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LucaMs said:
I knew that tests; it will not be my case, but I saw an online multiplayer card game (like mine SHOULD be :D) which had 85,000 users connected at the same time (at least they claim this).
Click to expand...
Yes I think some applications can have huge connected users at the same time .

Also lets take Whatsapp as an example .
Is it saving and proccessing all users' data on one server ?
 
LucaMs

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Erel said:
Even if there are 85k users connected, it doesn't mean that each one of them sends a request every second.
Click to expand...
Yes, I thought to this too... but I cannot know exact values.
Probably I will use a single GREAT B4J server ;)


Erel said:
This is for example how the B4i builders work.
Click to expand...
A diagram of how B4i builders work would be VEEERY useful
 
Erel

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LucaMs said:
A diagram of how B4i builders work would be VEEERY useful
Click to expand...
Each one of the builders sends a "ping" message to the manager every minute.
The manager maintains a list of the active builders based on these pings.

The B4i IDE connects to the manager and receives back the ip address of one of the builders and then works with this builder.

If a builder becomes offline then it will be removed from the list after a few minutes (because it stopped sending pings).
 
somed3v3loper

somed3v3loper

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Erel said:
Of course not.
Click to expand...
So how is it connected to servers ?
shouldn't it have some redirecting method?

BTW , I have some issue replying to forum posts while using mobile .
I have to touch "reply" twice so message gets quoted to text box .
 
KMatle

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See "Load Balancing". I would prefer the built in functions of Apache (safe & tested)... and don't forget the database System...
 
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