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A server can only be deleted if there is no elements which reference it. This is taken care via srv_check_for_deletion(), most notably for active and idle connections. A special case occurs for connections directly managed by a session. This is for so-called private connections, when using http-reuse never or H2 + http-reuse safe for example. In this case. server does not account these connections into its idle lists. This caused a bug as the server is deleted despite the session still being able to access it. To properly fix this, add a new referencing element into the server for these session connections. A mt_list has been chosen for this. On default http-reuse, private connections are typically not used so it won't make any difference. If using H2 servers, or more generally when dealing with private connections, insert/delete should typically occur only once per session lifetime so impact on performance should be minimal. This should be backported up to 2.4. Note that srv_check_for_deletion() was introduced in 3.0 dev tree. On backport, the extra condition in it should be placed in cli_parse_delete_server() instead.
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)