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Avoid closing idle connections if a soft stop is in progress. By default, idle connections will be closed during a soft stop. In some environments, a client talking to the proxy may have prepared some idle connections in order to send requests later. If there is no proper retry on write errors, this can result in errors while haproxy is reloading. Even though a proper implementation should retry on connection/write errors, this option was introduced to support back compat with haproxy < v2.4. Indeed before v2.4, we were waiting for a last request to be able to add a "connection: close" header and advice the client to close the connection. In a real life example, this behavior was seen in AWS using the ALB in front of a haproxy. The end result was ALB sending 502 during haproxy reloads. This patch was tested on haproxy v2.4, with a regular reload on the process, and a constant trend of requests coming in. Before the patch, we see regular 502 returned to the client; when activating the option, the 502 disappear. This patch should help fixing github issue #1506. In order to unblock some v2.3 to v2.4 migraton, this patch should be backported up to v2.4 branch. Signed-off-by: William Dauchy <wdauchy@gmail.com> [wt: minor edits to the doc to mention other options to care about] Signed-off-by: Willy Tarreau <w@1wt.eu> |
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The HAProxy documentation has been split into a number of different files for ease of use. 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)