Installing unifi-poller influxdb and grafana on a unifi Cloud Key 2 (non plus, but plus should work too)

Here is a short guide on how to install Grafana, InfluxDB and unifi-poller onto a Unifi Cloud key 2 (native storage, not the SD-card):

Please make sure you change the default passwords and usernames to keep things safe. 

Where I have found documentation to do a step, I have referenced it, so if things don't work for you, go there, they have probably changed something (and hopefully their documentation too!)

If you have any suggestions for improvements, let me know by commenting on this post.

And in case you were wondering what's inside: https://fccid.io/SWX-UCKG2/Internal-Photos/Internal-Photos-3757624

This whole article was as a response to https://github.com/unifi-poller/unifi-poller/issues/172

I am adding this picture, to make everything slightly more interesting:

Install Grafana (https://grafana.com/docs/grafana/latest/installation/debian/):
curl https://packages.grafana.com/gpg.key | sudo apt-key add -
apt install -y apt-transport-https
add-apt-repository "deb https://packages.grafana.com/oss/deb stable main"

apt -y update && sudo apt -y install grafana
systemctl daemon-reload
systemctl start grafana-server
systemctl enable grafana-server.service
systemctl status grafana-server


Install Influxdb (comes in Xenial):
apt-get update
apt-get install -y influxdb influxdb-client

Add user to influx (https://v2.docs.influxdata.com/v2.0/users/create-user/):
influx -host localhost -port 8086
CREATE DATABASE unifi
USE unifi
CREATE USER unifipoller WITH PASSWORD 'unifipoller' WITH ALL PRIVILEGES
GRANT ALL ON unifi TO unifipoller

Install unifi-poller (https://github.com/unifi-poller/unifi-poller/wiki/Installation#debian-variants-ubuntu-knoppix):
curl -s https://golift.io/gpgkey | sudo apt-key add -
echo deb https://dl.bintray.com/golift/ubuntu bionic main | sudo tee /etc/apt/sources.list.d/golift.list
apt update
apt install unifi-poller

Correct the unifi-poller configuration file (https://github.com/unifi-poller/unifi-poller/wiki/Installation#linux-post-install):
vi /etc/unifi-poller/up.conf

Go to the Grafana webpage http://controller-ip:3000 and login with admin/admin
Change your password for admin
Add an influxdb datasource (it should say it's connected)
Add dashboards by ID: https://github.com/unifi-poller/unifi-poller/wiki/Grafana#import-dashboards

Memory usage:
 PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
  988 unifi     20   0 6368724 405672  19228 S  32.6 20.0   3:29.76 java
  911 unifi     20   0 3170348  74576  16972 S   0.0  3.7   0:10.08 launcher
 1036 grafana   20   0 1654836  32816  17276 S   0.0  1.6   0:03.70 grafana-server
 1170 unifi     20   0 1230256 101868  18208 S   5.6  5.0   0:32.71 mongod
  758 root      20   0  933412  37248  13480 S   0.0  1.8   0:04.16 node
  626 www-data  20   0  881340  42920  12276 S   0.0  2.1   0:02.81 node
  761 nobody    20   0  715480  13712   5664 S   7.6  0.7   0:07.50 unifi-poller
  754 influxdb  20   0  612316  94832   6944 S   5.9  4.7   0:25.09 influxd
  784 root      20   0  530660  32420  13316 S   0.0  1.6   0:02.22 containerd

  615 root      20   0  168552  12780   8820 S   3.9  0.6   0:23.99 ck-ui