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The case, when the new worker fails while it parses its configuration or while it tries to apply it, could be considered as the new one, because the master process is no longer need to reexec again. The master simply keeps the previous worker (forked before the reload) and it let the new one to exit with failure. When the new worker exits, in the master process context (mworker_catch_sigchld) we need to stop a MASTER proxy listener and we need to drop the server, attached to new worker's CLI sockpair (it's inherited in master). Then we explicitly delete master's end of this sockpair (child->ipc_fd[0]) from the fdtab and we free the memory allocated for the worker process. on_new_child_failure() is called before the clean up to signal systemd that reload/load was failed. If the new worker fails during the first start, so there is no any previous worker, master process should exit immediately in order to keep the same behaviour, as it was before this architecture change.
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.