Netdata will be part of the QualityBox dashboard.
See http://wiki.freephile.org:20000/
Contents
System Locations
- the daemon at /usr/sbin/netdata - config files in /etc/netdata - web files in /usr/share/netdata - plugins in /usr/libexec/netdata - cache files in /var/cache/netdata - db files in /var/lib/netdata - log files in /var/log/netdata - pid file at /var/run/netdata.pid - logrotate file at /etc/logrotate.d/netdata
Host Modifications
HAProxy
frontend netdata
bind *:20000
mode http
default_backend netdata-back
backend netdata-back
server nd1 127.0.0.1:19999
Kernel
You have kernel memory de-duper (called Kernel Same-page Merging, or KSM) available, but it is not currently enabled.
Memory de-duplication instructions
To enable it run:
echo 1 >/sys/kernel/mm/ksm/run echo 1000 >/sys/kernel/mm/ksm/sleep_millisecs
If you enable it, you will save 40-60% of netdata memory.
Ports
netdata by default listens on all IPs on port 19999. We add a rule to firewalld to allow 20000 and then pass that port through to the backend in haproxy config.
http://this.machine.ip:20000/ => http://127.0.0.1:19999
Start/Stop
To stop netdata run:
systemctl stop netdata
To start netdata run:
systemctl start netdata
Installation extras
The configuration will send messages to 'root' so be sure to either edit the conf sudo vim /etc/netdata/health_alarm_notify.conf, or set vim /etc/aliases && newaliases
You'll probably receive alarms for 'tcp listen drops'. This is likely bot-related, and there is a good discussion on how to identify the source of the problem and how to mitigate or resolve it https://github.com/firehol/netdata/issues/3234
Following the advice from NASA at https://wiki.earthdata.nasa.gov/display/HDD/SOMAXCONN, I increased my somaxconn kernel parameter to 1024 from 128
cat /proc/sys/net/core/somaxconn
128
sysctl -w net.core.somaxconn=1024
Updates
Netdata will update itself, and puts a script into cron:
ln -s /root/netdata/netdata-updater.sh /etc/cron.daily/netdata-updater