On Wednesday 17 March 2021 at 17:05:37, Jason Long wrote:
> Thank you.
> My VM uses port forwarding. When I browse 127.0.0.1:2080 on my host then it
> forwarded to my guest port 80.
That's neither here nor there for what we're discussing.
> > Are you suggesting that a request which *would* go to 192.168.1.4 if it
> > were turned on, should in fact go to 192.168.1.20 if 192.168.1.4 is turned
> > off?
>
> Yes.
In that case you *are* talking about load balancing.
> My browser can't distinguish my requests and when a server is off then it
> must forwarded to other servers automatically.
https://httpd.apache.org/docs/2.4/mod/mod_proxy_balancer.html
> I know in a real scenario, it solved by domain name.
I do not understand that.
A reverse proxy which forwards incoming requests to various back-end servers
based on whether they are available or not doesn't care what the names or IP
addresses of those back-end servers are (they need to be configured into the
reverse proxy setup, of course, but they can be totally independent of each
other without problem).
> If my configuration is OK, then Apache accepts a request from port 80, one of
> my servers is turned off and Apache must forward it to another server.
I can only repeat myself:
https://httpd.apache.org/docs/2.4/mod/mod_proxy_balancer.html
Antony.
--
A good conversation is like a miniskirt;
short enought to retain interest,
but long enough to cover the subject.
- Celeste Headlee
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