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HAProxy - Load balancer
02e1975c29
There's a nasty case with listeners that belong to foreign processes.
If a proxy is defined this way:
global
nbproc 2
frontend f
bind :1111 process 1
bind :2222 process 2
and if stats expose-fd listeners is set, the listeners' FDs will not
be closed on the processes that don't use them. At this point it's not
a big deal, except that they're shared between processes and that a
"disable frontend f" issued on one process will pause all of them and
cause the other process to see accept() fail, turning its own listener
to state LI_LIMITED to try to leave it some time to recover. But it
will never recover, even after an enable.
The root cause of the issue is that the ZOMBIE state doesn't cover
this situation since it's only for a proxy being entirely bound to a
process.
What we do here to address this is that we refrain from pausing a
file descriptor that belongs to a foreign process in pause_listener().
This definitely solves the problem. A similar test is present in
resume_listener() and is the reason why the FD doesn't recover upon the
"enable" action by the way.
This ought to be backported to 1.8 where seamless reload was integrated.
The config above should be sufficient to validate that the fix works;
after a pair of "disable/enable frontend" no process will handle the
traffic to one of the ports anymore.
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| include | ||
| reg-tests | ||
| scripts | ||
| src | ||
| tests | ||
| .cirrus.yml | ||
| .gitattributes | ||
| .gitignore | ||
| .travis.yml | ||
| BRANCHES | ||
| CHANGELOG | ||
| CONTRIBUTING | ||
| INSTALL | ||
| LICENSE | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
| ROADMAP | ||
| SUBVERS | ||
| VERDATE | ||
| VERSION | ||
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)