Duplicate TCP traffic with a proxy
I need to send (duplicate) traffic from one machine (port) and to two different machines (ports). I need to take care of TCP session as well.
In the beginnig I used em-proxy, but it seems to me that the overhead is quite large (it goes over 50% of cpu). Then I installed haproxy and I managed to redirect traffic (not to duplicate). The overhead is reasonable (less than 5%).
The problem is that I could not say in haproxy config file the following:
- listen on specific address:port and whatever you find send on the two different
machines:ports and discard the answers from one of them.
Em-proxy code for this is quite simple, but it seems to me that EventMachine generates a lot of overhead.
Before I dig in haproxy code and try to change (duplicate traffic) I would like to know is there something similar out there?
Thanks.
Answer
I have created a proxy just for this purpose.
https://github.com/chrislusf/teeproxy
Usage
./teeProxy -l :8888 -a localhost:9000 -b localhost:9001
tee-proxy is a reverse proxy. For each incoming request, it clones the request into 2 and then forwards them to 2 servers. The results from server a is returned as usual, but the results from server b is ignored.
tee-proxy handles both GET, POST, and other HTTP methods.