icinga2 check_mysql_health插件
https://labs.consol.de/nagios/check_mysql_health/
# tar zxfv check_mysql_health-2.2.2.tar.gz
# cd check_mysql_health-2.2.2
# ./configure
# make
# make install
# cp -rv /usr/local/nagios/libexec/check_mysql_health /usr/lib64/nagios/plugins/
# chmod +x /usr/lib64/nagios/plugins/check_mysql_health
編譯生成的check_mysql_health可以直接給其它服務器用，不需要再編譯生成
抓取mysql連接數：
# /usr/lib64/nagios/plugins/check_mysql_health --hostname 127.0.0.1 --username iccheck --password xxxxxx --mode threads-connected --warning 1000 --critical 2000
寫到/etc/nagios/nrpe.cfg
# vi /etc/nagios/nrpe.cfg
command[check_mysql_C]=sudo /usr/lib64/nagios/plugins/check_mysql_health --hostname 127.0.0.1 --username iccheck --password xxxxx --mode threads-connected --warning 1000 --critical 2000
:wq
# service nrpe restart （Ubuntu是service nagios-npre-server restart）
icinga2配置略