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A lot of open Nagios 4 issues have been fixed in Naemon.
Also we removed the CGIs in favor of the Thruk gui.
For error tracing its often useful to have a backtrace. For example if naemon crashes. You can start naemon with GDB like this.
Livestatus requires us to export or set LD_PRELOAD before running GDB, so we first have to find that library:
%> find /lib/ /usr/lib/ /lib64/ /usr/lib64/ -name libpthread.so.0 /lib/i386-linux-gnu/libpthread.so.0
If available you should install the
naemon-core-dbg package which
contains additional debugging symbols that makes troubleshooting a lot easier.
Then run Naemon with GDB, you will have to type
run after the prompt:
%>LD_PRELOAD=/lib/libpthread.so.0 gdb --args /usr/bin/naemon-dbg /etc/naemon/naemon.cfg GNU gdb (GDB) 7.0.1-debian Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i486-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /usr/bin/naemon-dbg...done. (gdb) run
After typing ‘run’ you need to wait till the program crashes or exists otherwise. In our case we just used ‘kill -11’ to fake a segfault in the core:
Program received signal SIGSEGV, Segmentation fault. 0xb7fe2424 in __kernel_vsyscall () (gdb)
bt you will get the desired backtrace:
(gdb) bt #0 0xb7fe2424 in __kernel_vsyscall () #1 0xb7f1b6f6 in epoll_wait () from /lib/i686/cmov/libc.so.6 #2 0x080c3d07 in iobroker_poll (iobs=0x80ef0b0, timeout=1500) at iobroker.c:348 #3 0x08077b18 in event_execution_loop () at events.c:1060 #4 0x080821db in main (argc=2, argv=0xbffff644) at naemon.c:768
Now go to the naemon issues page and file a new bug after having a look if this hasn’t been reported yet.
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Please see our Usersguide guidelines for some basic information how we write our documentation
Small changes like typos can be corrected and submitted directly on github via the edit button.
![github edit button](images/githubedit.png "Github Edit Button")
Just navigation to the page you want to change and send a pull request via the online editor of github. Read more about the online editor…
Larger changes should be tested and reviewed locally before submitting them. Also it’s good practice to talk to a team member before spending large amounts of time in things we eventually won’t accept for whatever reasons. The developer guide contains instructions on how to run a local Jekyll server. When done, just submit a normal pull request.