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This patch solves the problem reported in github issue #1204, where the OpenTracing filter cannot communicate with the selected tracer if HAProxy is run in daemon mode. The author of the reported issue uses Zipkin tracer, while in this example Jaeger tracer is used (see gdb output below). The problem is that the OpenTracing library is initialized before HAProxy initialize the daemon mode. Establishing this mode kills the OpenTracing thread, after which the correct operation of the OpenTracing filter is no longer possible. Also, HAProxy crashes on deinitialization of the OpenTracing library. The initialization of the OpenTracing library has been moved from the flt_ot_init() function (which is started before switching the HAProxy to daemon mode) to the flt_ot_init_per_thread() function (which is run after switching the HAProxy to daemon mode). Gdb output of crashed HAProxy process: [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Core was generated by `../../../haproxy -f sa/haproxy.cfg'. Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00007f8131fd5629 in pthread_join (threadid=140192831239936, thread_return=0x0) at pthread_join.c:45 45 pthread_join.c: No such file or directory. (gdb) where #0 0x00007f8131fd5629 in pthread_join (threadid=140192831239936, thread_return=0x0) at pthread_join.c:45 #1 0x00007f812f15abc7 in std:🧵:join() () from /tmp/haproxy-os-master/contrib/opentracing/test/libjaeger_opentracing_plugin-0.5.0.so #2 0x00007f812f0fb6f7 in jaegertracing::reporters::RemoteReporter::close() () from /tmp/haproxy-os-master/contrib/opentracing/test/libjaeger_opentracing_plugin-0.5.0.so #3 0x00007f812f0b7055 in jaegertracing::reporters::CompositeReporter::close() () from /tmp/haproxy-os-master/contrib/opentracing/test/libjaeger_opentracing_plugin-0.5.0.so #4 0x00007f812f0b9136 in jaegertracing::Tracer::Close() () from /tmp/haproxy-os-master/contrib/opentracing/test/libjaeger_opentracing_plugin-0.5.0.so #5 0x00007f81309def32 in ot_tracer_close (tracer=0x55fb48057390) at ../../src/tracer.cpp:91 #6 0x000055fb41785705 in ot_close (tracer=0x55fb48061168) at contrib/opentracing/src/opentracing.c:208 #7 0x000055fb4177fc64 in flt_ot_deinit (p=<optimized out>, fconf=<optimized out>) at contrib/opentracing/src/filter.c:215 #8 0x000055fb418bc038 in flt_deinit (proxy=proxy@entry=0x55fb4805ce50) at src/filters.c:360 #9 0x000055fb41893ed1 in free_proxy (p=0x55fb4805ce50) at src/proxy.c:315 #10 0x000055fb41888809 in deinit () at src/haproxy.c:2217 #11 0x000055fb41889078 in deinit_and_exit (status=0) at src/haproxy.c:2343 #12 0x000055fb4173d809 in main (argc=<optimized out>, argv=<optimized out>) at src/haproxy.c:3230 This patch should be backported to all branches where the OpenTracing filter is located.
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)