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HAProxy - Load balancer
5220a8c5c4
Timeouts for dynamic resolutions are not handled at the stream level but by the resolvers themself. It means there is no connect, client and server timeouts defined on the internal proxy used by a resolver. While it is not an issue for DNS resolution over UDP, it can be a problem for resolution over TCP. New sessions are automatically created when required, and killed on excess. But only established connections are considered. Connecting ones are never killed. Because there is no conncet timeout, we rely on the kernel to report a connection error. And this may be quite long. Because resolutions are periodically triggered, this may lead to an excess of unusable sessions in connecting state. This also prevents HAProxy to quickly exit on soft-stop. It is annoying, especially because there is no reason to not set a connect timeout. So to mitigate the issue, we now use the "resolve" timeout as connect timeout for the internal proxy attached to a resolver. This patch should be backported as far as 2.4. |
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The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)