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====== influxdb ======

<code>
curl -sL https://repos.influxdata.com/influxdb.key | apt-key add -
source /etc/lsb-release
echo "deb https://repos.influxdata.com/${DISTRIB_ID,,} ${DISTRIB_CODENAME} stable" | tee -a /etc/apt/sources.list
apt update
apt install influxdb
</code>

enable admin service in /etc/influxdb/influxdb.conf and
<code>
systemctl restart influxdb
</code>

create database
<code>
root@graphite:~# influx
Connected to http://localhost:8086 version 1.2.1
InfluxDB shell version: 1.2.1
> create database captive
> CREATE USER "captive" WITH PASSWORD 'captive' WITH ALL PRIVILEGES
> show databases
name: databases
name
----
_internal
captive
> 

</code>

select
<code>
influx -database test -execute 'select * from "mctc.veicoli.get" order by time desc limit 10'
</code>

test
<code>
curl -G http://carbon:8086/query  --data-urlencode "q=SHOW DATABASES"
</code>

python test
<code python>
from influxdb import InfluxDBClient
client = InfluxDBClient('carbon.csgalileo.org', 8086, username='captive', password='captive', database='test')

json_body = [{"measurement": "browser", "tags": {"server":1, "server-name":"galileo"}, "time": datetime.utcnow().strftime('%Y-%m-%dT%H:%M:%SZ'), "fields": {"value":"ios"}}]
client.write_points(json_body)

client.query('select value from browser;')


</code>

retention
<code>
CREATE RETENTION POLICY "a_year" ON "test" DURATION 52w REPLICATION 1 SHARD DURATION 168h
CREATE RETENTION POLICY "a_week" ON "test" DURATION 168h REPLICATION 1 SHARD DURATION 24h DEFAULT
</code>
====== grafana ======

===== install =====

<code bash>
TODO

# per rasp
cd /tmp
wget https://github.com/fg2it/grafana-on-raspberry/releases/download/v4.6.1/grafana_4.6.1_armhf.deb
dpkg -i grafana_4.6.1_armhf.deb


systemctl enable grafana-server
systemctl start grafana-server
</code>

Login to http://localhost:3000 (admin/admin)

add datasource {{ :projects:internetofthings:datasource.png |}}


===== plugins =====

Add plugin in /var/lib/grafana/plugins/ directory

piechart
<code bash>
cd /var/lib/grafana/plugins/
git clone https://github.com/grafana/piechart-panel.git
systemctl restart grafana-server.service
</code>
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