MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
It is possible to have mysqld write the error
log to the system log (the Event Log on Windows, and
syslog on Unix and Unix-like systems). To do
so, use these system variables:
log_syslog: Enable this
variable to send the error log to the system log. (On
Windows, log_syslog is
enabled by default.)
If log_syslog is enabled,
the following system variables can also be used for finer
control.
log_syslog_facility: The
default facility for syslog messages is
daemon. Set this variable to specify a
different facility.
log_syslog_include_pid:
Whether to include the server process ID in each line of
syslog output.
log_syslog_tag: This
variable defines a tag to add to the server identifier
(mysqld) in syslog
messages. If defined, the tag is appended to the identifier
with a leading hyphen.
Error logging to the system log may require additional system configuration. Consult the system log documentation for your platform.
On Unix and Unix-like systems, control of output to
syslog is also available using
mysqld_safe, which can capture server error
output and pass it to syslog.
Using mysqld_safe for
syslog error logging is deprecated; you
should use the server system variables instead.
mysqld_safe has three error-logging options,
--syslog,
--skip-syslog,
and --log-error. The default
with no logging options or with
--skip-syslog
is to use the default log file. To explicitly specify use of an
error log file, specify
--log-error=
to mysqld_safe, which then arranges for
mysqld to write messages to a log file. To
use file_namesyslog, specify the
--syslog option. For
syslog output, a tag can be specified with
--syslog-tag=;
this is appended to the tag_valmysqld server
identifier with a leading hyphen.