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When "set-dumpable" is set to "libs", in addition to marking the process dumpable, haproxy also reads the binary and shared objects into memory as a tar archive in a page-aligned location so that these files are easily extractable from a future core dump. The goal here is to always have access to the exact same binary and libs as those which caused the core to happen. It's indeed very frequent to miss some of these, or to get mismatching files due to a local update that didn't experience a reload, or to get those of a host system instead of the container. The in-memory tar file presents everything under a directory called "core-%d" where %d corresponds to the PID of the worker process. In order to ease the finding of these data in the core dump, the memory area is contiguous and surrounded by PROT_NONE pages so that it appears in its own segment in the core file. The total size used by this is a few tens of MB, which is not a problem on large systems.
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.