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When dealing with input/output on a connection related handler, special care must be taken prior to access the connection if it is considered as idle, as it could be manipulated by another thread. Thus, connection is first removed from its idle tree before processing. The connection is reinserted on processing completion unless it has been freed during it. Idle private connections are not concerned by this, because takeover is not applied on them. However, a future patch will implement purging of these connections along with regular idle ones. As such, it is necessary to also protect private connections usage now. This is the subject of this patch and the next one. With this patch, input/output handlers epilogue of muxes/SSL/conn_notify_mux() are adjusted. A new code path is able to deal with a connection attached to a session instead of a server. In this case, session_reinsert_idle_conn() is used. Contrary to session_add_conn(), this new function is reserved for idle connections usage after a temporary removal. Contrary to _srv_add_idle() used by regular idle connections, session_reinsert_idle_conn() may fail as an allocation can be required. If this happens, the connection is immediately destroyed. This patch has no effect for now. It must be coupled with the next one which will temporarily remove private idle connections on input/output handler prologue.
HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
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)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.