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In the new master-worker architecture, when a worker process is forked and successfully initialized it needs somehow to communicate its "READY" state to the master, in order to terminate the previous worker and workers, that might exceeded max_reloads counter. So, let's implement for this a new master CLI _send_status command. A new worker can send its status string "READY" to the master, when it's about entering to the run poll loop, thus it can start to receive data. In _send_status() in the master context we update the status of the new worker: PROC_O_INIT flag is withdrawn. When TERM signal is sent to a worker, worker terminates and this triggers the mworker_catch_sigchld() handler in master. This handler deletes the exiting process entry from the processes list. In _send_status() we loop over the processes list twice. At the first time, in order to stop workers that exceeded the max_reloads counter. At the second time, in order to stop the worker forked before the last reload. In the corner case, when max_reloads=1, we avoid to send SIGTERM twice to the same worker by setting sigterm_sent flag during the first loop.
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.