Hello list users. I'm struggling with mod_proxy parameters related to amount of open connections to backend etc. Here is an excerpt of my configuration: ProxyPass /exchange/ https://exchange.company.com/exchange/ min=10 max=32 acquire=10000 keepalive=on retry=5 timeout=15 ProxyPassReverse /exchange/ https://exchange.company.com/exchange/ ProxyPass /exchweb/ https://exchange.company.com/exchweb/ min=10 max=32 acquire=10000 keepalive=on retry=5 timeout=15 ProxyPassReverse /exchweb/ https://exchange.company.com/exchweb/ ProxyPass /public/ https://exchange.company.com/public/ min=10 max=32 acquire=10000 keepalive=on retry=5 timeout=15 ProxyPassReverse /public/ https://exchange.company.com/public/ ProxyPass /iisadmpwd/ https://exchange.company.com/iisadmpwd/ min=10 max=32 acquire=10000 keepalive=on retry=5 timeout=15 ProxyPassReverse /iisadmpwd/ https://exchange.company.com/iisadmpwd/ As you can see, what I'm trying to achieve is a webmail proxy for our company's Exchange server. This problem is not tied to Exchange however, I'm experiencing the problem described below no matter what server is used a a backend. First of all, min parameter seems not have any effect. When I start Apache, 10 connections are not opened to backend immediately. From documentation: min: Minimum number of connections that will always be open to the backend server.
From that, I would conclude that it should keep 10 connections always opened, no matter what. However, using netstat -atpn I can see that connections are not opened always, but instead only during activity from the clients.
Second problem is keepalive. From documentation, I understand that this parameter should cause connections once opened to be kept open. This seems not to be case; after activity, connections are kept open for some time, but no keepalives are sent. I have verified this using wireshark. As a result, backend server soon resets the connections, and they have to be opened again upon new activity. I have also notices the same behavior with both prefork and worker mpm's. Currently prefork mpm is in use: StartServers 10 MinSpareServers 10 MaxSpareServers 20 MaxClients 256 MaxRequestsPerChild 0 I'm starting to think that I have understood something completely wrong here. I would be thankful of any hint about what might be going on here. Regards, Petteri Heinonen -- --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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