9410b2ab97
The keyword check-reuse-pool allows to reuse an idle connection to perform a health check instead of opening a new one. It is implemented similarly to HTTP transfer reuse : a hash is calculated with a subset of properties to lookup a connection with the same characteristics. One of these properties is the destination address. Initially it was always set to NULL prior to reuse check, as this is necessary to match connections on a reverse-HTTP server. However, this prevents reuse on other servers with a proper address configured. Indeed, in this case destination address is always used as key for connections inserted in idle pool. This patch fixes this by properly setting destination address for check reuse. By default, it reuses the address from the server. The only exception is if the server is using reverse-HTTP, in which case address remains NULL. A new test is also performed prior to try check reuse to ensure this is not performed on a transparent server. Indeed, in this case server address would be unset. Anyway, check cannot reuse a connection in this case so this is OK. Note that this does not prevent to continue check with a newly connection with a NULL address : this should be handled more properly in another patch. This must be backported up to 3.2. |
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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.