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This patch adds a new member <curr_sess_idle_conns> on the server. It serves as a counter of idle connections attached on a session instead of regular idle/safe trees. This is used only for private connections. The objective is to provide a method to detect if there is idle connections still referencing a server. This will be particularly useful to ensure that a server is removable. Currently, this is not yet necessary as idle connections are directly freed via "del server" handler under thread isolation. However, this procedure will be replaced by an asynchronous mechanism outside of thread isolation. Careful: connections attached to a session but not idle will not be accounted by this counter. These connections can still be detected via srv_has_streams() so "del server" will be safe. This counter is maintain during the whole lifetime of a private connection. This is mandatory to guarantee "del server" safety and is conform with other idle server counters. What this means it that decrement is performed only when the connection transitions from idle to in use, or just prior to its deletion. For the first case, this is covered by session_get_conn(). The second case is trickier. It cannot be done via session_unown_conn() as a private connection may still live a little longer after its removal from session, most notably when scheduled for idle purging. Thus, conn_free() has been adjusted to handle the final decrement. Now, conn_backend_deinit() is also called for private connections if CO_FL_SESS_IDLE flag is present. This results in a call to srv_release_conn() which is responsible to decrement server idle counters.
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.