icinga2.service used `-e ${ICINGA2_ERROR_LOG}`, but this is documented
as having no effect without `-d`. Furthermore, icinga2 under systemd
unconditionally logged everything to the system log (but without setting
the log level etc), which contradicted the documentation. (Issue #6339)
Stop icinga2 on systemd from logging to stdout - and hence the system log -
once it has finished starting up. Just like when you start icinga2 from a
terminal using `-d`. And just like -d, we stop logging fatal errors to
stderr, and instead write to the log file passed with `-e`.
As per docs, mainlog (icinga2.log) is already enabled by default. And
pre-startup messages including config errors will still appear in the
system log.
This uses a new option --close-stdio, which has the same effect on logging as
--daemonize, but does not fork or call setsid().
For this purpose, I moved setsid() up and into Daemonize().
Consequence of that last point: if anyone is weird enough to specify a TTY
device file as the fatal error log (-e option), that will become icinga's
controlling terminal, which you generally don't want as a daemon. This
makes it consistent with the existing behaviour for icinga mainlog. For
this reason you're supposed to use O_NOCTTY in Linux daemons. But I wasn't
sure where icinga would want to put the ugly `#ifdef _WIN32 ... #else ...`.
Main focus: Object attributes and their value types. Originates from the
API Event Streams patch to document their value types. Now applied to
the entire configuration objects chapter.
The API chapter and their value types has been changed to capitalized
type identifiers.
Value types are now explicitly told about inside monitoring basics. This
has been adopted into the Icinga 2 training material a long time ago
and finds its way into the docs too.
The CheckResult and PerfdataValue value types have been moved into the
advanced topics chapter. mkdocs doesn't like multiple `#` headings in one file
and did just hide it.
Also moved the Influxdb details into the features documentation where it
belongs.
Many small references and URLs to other chapters added.
E.g. dedicated chapters for object accessor examples, to better link against
time dependent thresholds.
Can serve as patch basis and reference for ITL documentation where the
value types are missing too.
This commit also fixes the non-requirement of "legacy-timeperiod" which
also is a default template import since 2.6.
This also fixes the state mapping issue.
fixes#4015
* Rename files to allow easy ordering
* Update links inside markdown according to new file names
* Move HTML links (<a>...</a>) to the end of the header lines
* This is necessary to allow mkdocs to parse headers correctly and display them in the TOC
* Following sed command was used: sed -i .bu 's/\(<a.*a>\) \(.*\)/\2 \1/g' $filename
Also apply a new structure.
Deleted the old cluster and client documentation and started "fresh".
This commit also includes various images used in the newly written
"Distributed Monitoring" chapter for better understanding.
fixes#12386
Michael Friedrich
Alan Jenkins
Markus Frosch
Jean Flach
Blerim Sheqa
Micha Ahrweiler
Gunnar Beutner
Michael Friedrich