9e17087aeb
When the hot list was removed in 3.0, a regression was introduced. Theorically, it is possible to override data in a block when new data are appended. It happens when data are copied. If the data size is a multiple of the block size, all data are copied and the last used block is full. But instead of saving a reference on the next block as the restart point for the next copies, we keep a reference on the last full one. On the next read, we reuse this block and old data are crushed. To hit the bug, no new blocks should be reserved between the two data copy attempts. Concretely, for now, it seems not possible to hit the bug. But with a block size set to 1024, if more than 1024 bytes are reseved, with a first copy of 1024 bytes and a second one with remaining data, data in the first block will be crushed. So to fix the bug, the reference of the last block used to write data (which is in fact the next one to use to perform the next copy) is only updated when a block is full. In that case the next block is used. This patch should be backported as far as 3.0 after a period of observation. |
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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.