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faa8c3e024
Motivation: When services are discovered through DNS resolution, the order in which DNS records get resolved and assigned to servers is arbitrary. Therefore, even though two HAProxy instances using chash balancing might agree that a particular request should go to server3, it is likely the case that they have assigned different IPs and ports to the server in that slot. This patch adds a server option, "hash-key <key>" which can be set to "id" (the existing behaviour, default), "addr", or "addr-port". By deriving the keys for the chash tree nodes from a server's address and port we ensure that independent HAProxy instances will agree on routing decisions. If an address is not known then the key is derived from the server's puid as it was previously. When adjusting a server's weight, we now check whether the server's hash has changed. If it has, we have to remove all its nodes first, since the node keys will also have to change. |
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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)