c91d93ed1c
add initial support for the "shm-stats-file" directive and associated "shm-stats-file-max-objects" directive. For now they are flagged as experimental directives. The shared memory file is automatically created by the first process. The file is created using open() so it is up to the user to provide relevant path (either on regular filesystem or ramfs for performance reasons). The directive takes only one argument which is path of the shared memory file. It is passed as-is to open(). The maximum number of objects per thread-group (hard limit) that can be stored in the shm is defined by "shm-stats-file-max-objects" directive, Upon initial creation, the main shm stats file header is provisioned with the version which must remains the same to be compatible between processes and defaults to 2k. which means approximately 1mb max per thread group and should cover most setups. When the limit is reached (during startup) an error is reported by haproxy which invites the user to increase the "shm-stats-file-max-objects" if desired, but this means more memory will be allocated. Actual memory usage is low at start, because only the mmap (mapping) is provisionned with the maximum number of objects to avoid relocating the memory area during runtime, but the actual shared memory file is dynamically resized when objects are added (resized by following half power of 2 curve when new objects are added, see upcoming commits) For now only the file is created, further logic will be implemented in upcoming commits.
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.