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数据源是通过influxdb-python写入到influxdb的，展示用的是grafana。
安装
for debian 9 strech version，这样才能是最新版本:
curl -sL https://repos.influxdata.com/influxdb.key | sudo apt-key add -
source /etc/os-release
test $VERSION_ID = "9" && echo "deb https://repos.influxdata.com/debian stretch stable" | sudo tee /etc/apt/sources.list.d/influxdb.list
sudo apt-get update && sudo apt-get install influxdb
sudo service influxdb start配置
将默认配置导出到文件，influxd -config /etc/influxdb/influxdb.conf，在创建数据库后用户后再打开认证，修改配置信息，打开认证。
[http]
enabled = true
bind-address = ":8086"
auth-enabled = true # ✨规则
Downsampling and data retention
retention policy
保留多久的数据
continuous query
按什么频率采样
4. Create the CQ
Now that we’ve set up our RPs, we want to create a CQ that will automatically and periodically downsample the ten-second resolution data to the 30-minute resolution, and store those results in a different measurement with a different retention policy.
Use the CREATE CONTINUOUS QUERY statement to generate a CQ:
> CREATE CONTINUOUS QUERY "cq_30m" ON "food_data" BEGIN
SELECT mean("website") AS "mean_website",mean("phone") AS "mean_phone"
INTO "a_year"."downsampled_orders"
FROM "orders"
GROUP BY time(30m)
END
That query creates a CQ called cq_30m in the database food_data. cq_30m tells InfluxDB to calculate the 30-minute average of the two fields website and phone in the measurement orders and in the DEFAULT RP two_hours. It also tells InfluxDB to write those results to the measurement downsampled_orders in the retention policy a_year with the field keys mean_website and mean_phone. InfluxDB will run this query every 30 minutes for the previous 30 minutes.
Note: Notice that we fully qualify (that is, we use the syntax "<retention_policy>"."<measurement>") the measurement in the INTO clause. InfluxDB requires that syntax to write data to an RP other than the DEFAULT RP. 实际使用说明
continuous query
CREATE CONTINUOUS QUERY org_stream_30m ON testdb BEGIN SELECT sum(value) INTO org_stream_30m FROM org_stream GROUP BY time(30m) ENDorg_stream按照30m分钟的频率采样插入org_stream_30m，group by time(30m)，每30分钟执行一次。
select * from org_stream where time >= ‘2017-11-01T00:00:00Z’
CLI
时间 pretty
进入influx后，输入precision rfc3339