mirror of https://github.com/Icinga/icinga2.git
318 lines
9.1 KiB
Markdown
318 lines
9.1 KiB
Markdown
# Develop Icinga 2 <a id="development"></a>
|
|
|
|
This chapter provides hints on Icinga 2 development
|
|
especially for debugging purposes.
|
|
|
|
> **Note**
|
|
>
|
|
> If you are planning to build your own development environment,
|
|
> please consult the `INSTALL.md` file from the source tree.
|
|
|
|
## Debug Requirements <a id="debug-requirements"></a>
|
|
|
|
Make sure that the debug symbols are available for Icinga 2.
|
|
The Icinga 2 packages provide a debug package which must be
|
|
installed separately for all involved binaries, like `icinga2-bin`
|
|
or `icinga2-ido-mysql`.
|
|
|
|
Debian/Ubuntu:
|
|
|
|
# apt-get install icinga2-dbg
|
|
|
|
RHEL/CentOS:
|
|
|
|
# yum install icinga2-debuginfo
|
|
|
|
SLES/openSUSE:
|
|
|
|
# zypper install icinga2-bin-debuginfo icinga2-ido-mysql-debuginfo
|
|
|
|
|
|
Furthermore, you may also have to install debug symbols for Boost and your C library.
|
|
|
|
If you're building your own binaries, you should use the `-DCMAKE_BUILD_TYPE=Debug` cmake
|
|
build flag for debug builds.
|
|
|
|
|
|
## GDB <a id="development-debug-gdb"></a>
|
|
|
|
Install gdb:
|
|
|
|
Debian/Ubuntu:
|
|
|
|
# apt-get install gdb
|
|
|
|
RHEL/CentOS/Fedora:
|
|
|
|
# yum install gdb
|
|
|
|
SLES/openSUSE:
|
|
|
|
# zypper install gdb
|
|
|
|
|
|
Install the `boost`, `python` and `icinga2` pretty printers. Absolute paths are required,
|
|
so please make sure to update the installation paths accordingly (`pwd`).
|
|
|
|
$ mkdir -p ~/.gdb_printers && cd ~/.gdb_printers
|
|
|
|
Boost Pretty Printers compatible with Python 3:
|
|
|
|
$ git clone https://github.com/mateidavid/Boost-Pretty-Printer.git && cd Boost-Pretty-Printer
|
|
$ git checkout python-3
|
|
$ pwd
|
|
/home/michi/.gdb_printers/Boost-Pretty-Printer
|
|
|
|
Python Pretty Printers:
|
|
|
|
$ cd ~/.gdb_printers
|
|
$ svn co svn://gcc.gnu.org/svn/gcc/trunk/libstdc++-v3/python
|
|
|
|
Icinga 2 Pretty Printers:
|
|
|
|
$ mkdir -p ~/.gdb_printers/icinga2 && cd ~/.gdb_printers/icinga2
|
|
$ wget https://raw.githubusercontent.com/Icinga/icinga2/master/tools/debug/gdb/icingadbg.py
|
|
|
|
Now you'll need to modify/setup your `~/.gdbinit` configuration file.
|
|
You can download the one from Icinga 2 and modify all paths.
|
|
|
|
Example on Fedora 22:
|
|
|
|
$ wget https://raw.githubusercontent.com/Icinga/icinga2/master/tools/debug/gdb/gdbinit -O ~/.gdbinit
|
|
$ vim ~/.gdbinit
|
|
|
|
set print pretty on
|
|
|
|
python
|
|
import sys
|
|
sys.path.insert(0, '/home/michi/.gdb_printers/icinga2')
|
|
from icingadbg import register_icinga_printers
|
|
register_icinga_printers()
|
|
end
|
|
|
|
python
|
|
import sys
|
|
sys.path.insert(0, '/home/michi/.gdb_printers/python')
|
|
from libstdcxx.v6.printers import register_libstdcxx_printers
|
|
try:
|
|
register_libstdcxx_printers(None)
|
|
except:
|
|
pass
|
|
end
|
|
|
|
python
|
|
import sys
|
|
sys.path.insert(0, '/home/michi/.gdb_printers/Boost-Pretty-Printer')
|
|
import boost_print
|
|
boost_print.register_printers()
|
|
end
|
|
|
|
|
|
If you are getting the following error when running gdb, the `libstdcxx`
|
|
printers are already preloaded in your environment and you can remove
|
|
the duplicate import in your `~/.gdbinit` file.
|
|
|
|
RuntimeError: pretty-printer already registered: libstdc++-v6
|
|
|
|
### GDB Run <a id="development-debug-gdb-run"></a>
|
|
|
|
Call GDB with the binary (`/usr/sbin/icinga2` is a wrapper script calling
|
|
`/usr/lib64/icinga2/sbin/icinga2` since 2.4) and all arguments and run it in foreground.
|
|
|
|
# gdb --args /usr/lib64/icinga2/sbin/icinga2 daemon -x debug --no-stack-rlimit
|
|
|
|
The exact path to the Icinga 2 binary differs on each distribution. On Ubuntu
|
|
it is installed into `/usr/lib/x86_64-linux-gnu/icinga2/sbin/icinga2` on 64-bit systems
|
|
for example.
|
|
|
|
> **Note**
|
|
>
|
|
> If gdb tells you it's missing debug symbols, quit gdb and install
|
|
> them: `Missing separate debuginfos, use: debuginfo-install ...`
|
|
|
|
Run the application.
|
|
|
|
(gdb) r
|
|
|
|
Kill the running application.
|
|
|
|
(gdb) k
|
|
|
|
Continue after breakpoint.
|
|
|
|
(gdb) c
|
|
|
|
### GDB Core Dump <a id="development-debug-gdb-coredump"></a>
|
|
|
|
Either attach to the running process using `gdb -p PID` or start
|
|
a new gdb run.
|
|
|
|
(gdb) r
|
|
(gdb) generate-core-file
|
|
|
|
### GDB Backtrace <a id="development-debug-gdb-backtrace"></a>
|
|
|
|
If Icinga 2 aborted its operation abnormally, generate a backtrace.
|
|
|
|
(gdb) bt
|
|
(gdb) thread apply all bt full
|
|
|
|
If gdb stops at a SIGPIPE signal please disable the signal before
|
|
running Icinga 2.
|
|
|
|
(gdb) handle SIGPIPE nostop noprint pass
|
|
(gdb) r
|
|
|
|
If you create a [bug report](https://www.icinga.com/community/get-involved/),
|
|
make sure to attach as much detail as possible.
|
|
|
|
### GDB Backtrace from Running Process <a id="development-debug-gdb-backtrace-running"></a>
|
|
|
|
If Icinga 2 is still running, generate a full backtrace from the running
|
|
process and store it into a new file (e.g. for debugging dead locks):
|
|
|
|
# gdb -p $(pidof icinga2) -batch -ex "thread apply all bt full" -ex "detach" -ex "q" > gdb_bt.log
|
|
|
|
### GDB Backtrace Stepping <a id="development-debug-gdb-backtrace-stepping"></a>
|
|
|
|
Identifying the problem may require stepping into the backtrace, analysing
|
|
the current scope, attributes, and possible unmet requirements. `p` prints
|
|
the value of the selected variable or function call result.
|
|
|
|
(gdb) up
|
|
(gdb) down
|
|
(gdb) p checkable
|
|
(gdb) p checkable.px->m_Name
|
|
|
|
|
|
### GDB Breakpoints <a id="development-debug-gdb-breakpoint"></a>
|
|
|
|
To set a breakpoint to a specific function call, or file specific line.
|
|
|
|
(gdb) b checkable.cpp:125
|
|
(gdb) b icinga::Checkable::SetEnablePerfdata
|
|
|
|
GDB will ask about loading the required symbols later, select `yes` instead
|
|
of `no`.
|
|
|
|
Then run Icinga 2 until it reaches the first breakpoint. Continue with `c`
|
|
afterwards.
|
|
|
|
(gdb) run
|
|
(gdb) c
|
|
|
|
If you want to delete all breakpoints, use `d` and select `yes`.
|
|
|
|
(gdb) d
|
|
|
|
> **Tip**
|
|
>
|
|
> When debugging exceptions, set your breakpoint like this: `b __cxa_throw`.
|
|
|
|
Breakpoint Example:
|
|
|
|
(gdb) b __cxa_throw
|
|
(gdb) r
|
|
(gdb) up
|
|
....
|
|
(gdb) up
|
|
#11 0x00007ffff7cbf9ff in icinga::Utility::GlobRecursive(icinga::String const&, icinga::String const&, boost::function<void (icinga::String const&)> const&, int) (path=..., pattern=..., callback=..., type=1)
|
|
at /home/michi/coding/icinga/icinga2/lib/base/utility.cpp:609
|
|
609 callback(cpath);
|
|
(gdb) l
|
|
604
|
|
605 #endif /* _WIN32 */
|
|
606
|
|
607 std::sort(files.begin(), files.end());
|
|
608 BOOST_FOREACH(const String& cpath, files) {
|
|
609 callback(cpath);
|
|
610 }
|
|
611
|
|
612 std::sort(dirs.begin(), dirs.end());
|
|
613 BOOST_FOREACH(const String& cpath, dirs) {
|
|
(gdb) p files
|
|
$3 = std::vector of length 11, capacity 16 = {{static NPos = 18446744073709551615, m_Data = "/etc/icinga2/conf.d/agent.conf"}, {static NPos = 18446744073709551615,
|
|
m_Data = "/etc/icinga2/conf.d/commands.conf"}, {static NPos = 18446744073709551615, m_Data = "/etc/icinga2/conf.d/downtimes.conf"}, {static NPos = 18446744073709551615,
|
|
m_Data = "/etc/icinga2/conf.d/groups.conf"}, {static NPos = 18446744073709551615, m_Data = "/etc/icinga2/conf.d/notifications.conf"}, {static NPos = 18446744073709551615,
|
|
m_Data = "/etc/icinga2/conf.d/satellite.conf"}, {static NPos = 18446744073709551615, m_Data = "/etc/icinga2/conf.d/services.conf"}, {static NPos = 18446744073709551615,
|
|
m_Data = "/etc/icinga2/conf.d/templates.conf"}, {static NPos = 18446744073709551615, m_Data = "/etc/icinga2/conf.d/test.conf"}, {static NPos = 18446744073709551615,
|
|
m_Data = "/etc/icinga2/conf.d/timeperiods.conf"}, {static NPos = 18446744073709551615, m_Data = "/etc/icinga2/conf.d/users.conf"}}
|
|
|
|
|
|
## Core Dump <a id="development-debug-core-dump"></a>
|
|
|
|
When the Icinga 2 daemon crashes with a `SIGSEGV` signal
|
|
a core dump file should be written. This will help
|
|
developers to analyze and fix the problem.
|
|
|
|
### Core Dump File Size Limit <a id="development-debug-core-dump-limit"></a>
|
|
|
|
This requires setting the core dump file size to `unlimited`.
|
|
|
|
Example for Systemd:
|
|
|
|
vim /usr/lib/systemd/system/icinga2.service
|
|
|
|
[Service]
|
|
...
|
|
LimitCORE=infinity
|
|
|
|
systemctl daemon-reload
|
|
|
|
systemctl restart icinga2
|
|
|
|
Example for init script:
|
|
|
|
vim /etc/init.d/icinga2
|
|
...
|
|
ulimit -c unlimited
|
|
|
|
service icinga2 restart
|
|
|
|
Verify that the Icinga 2 process core file size limit is set to `unlimited`.
|
|
|
|
cat /proc/`pidof icinga2`/limits
|
|
...
|
|
Max core file size unlimited unlimited bytes
|
|
|
|
|
|
### Core Dump Kernel Format <a id="development-debug-core-dump-format"></a>
|
|
|
|
The Icinga 2 daemon runs with the SUID bit set. Therefore you need
|
|
to explicitly enable core dumps for SUID on Linux.
|
|
|
|
sysctl -w fs.suid_dumpable=1
|
|
|
|
Adjust the coredump kernel format and file location on Linux:
|
|
|
|
sysctl -w kernel.core_pattern=/var/lib/cores/core.%e.%p
|
|
|
|
install -m 1777 -d /var/lib/cores
|
|
|
|
MacOS:
|
|
|
|
sysctl -w kern.corefile=/cores/core.%P
|
|
|
|
chmod 777 /cores
|
|
|
|
### Core Dump Analysis <a id="development-debug-core-dump-analysis"></a>
|
|
|
|
Once Icinga 2 crashes again a new coredump file will be written. Please
|
|
attach this file to your bug report in addition to the general details.
|
|
|
|
Simple test case for a `SIGSEGV` simulation with `sleep`:
|
|
|
|
ulimit -c unlimited
|
|
sleep 1800&
|
|
[1] <PID>
|
|
kill -SEGV <PID>
|
|
gdb `which sleep` /var/lib/cores/core.sleep.<PID>
|
|
(gdb) bt
|
|
rm /var/lib/cores/core.sleep.*
|
|
|
|
Analyzing Icinga 2:
|
|
|
|
gdb /usr/lib64/icinga2/sbin/icinga2 core.icinga2.<PID>
|
|
(gdb) bt
|
|
|