TL;DR InfluxDB Tech Tips - Knowing the Unexpected: Auth Failure, Data Truncation in Graphs & Change in Query Behavior
By Regan Kuchan / Mar 23, 2017 / InfluxDB, Tech Tips
Unexpected authentication failure
Q: I’m having trouble authenticating with InfluxDB’s Command Line Interface (CLI) and I can’t figure out what I’m doing wrong. I’m including a variation of my password just because I’m at my wits end:
Connect to the CLI and create a user:
$ influx Connected to http://localhost:8086 version 1.2.2 InfluxDB shell version: 1.2.2 > CREATE USER influxer WITH PASSWORD '[email protected]' WITH ALL PRIVILEGES > exit
Connect to the CLI with those authentication credentials:
$ influx -username influxer -password [email protected] Connected to http://localhost:8086 version 1.2.2 InfluxDB shell version: 1.2.2 > SHOW DATABASES ERR: authorization failed <--- Why? ????
I don’t see a typo anywhere. I have
auth-enabled set to
true in the configuration file. Am I missing a step?
A: We recommend single-quoting passwords if they have any special characters; some shells may attempt to inject variables into the password if it encounters a special character. So in your case, single-quote
[email protected] and you should be good to go!
Unexpected data truncation in graphs
Q: I’m using Chronograf to visualize my data and my graphs seem to be returning truncated data (details below). Is there a default setting in InfluxDB or Chronograf that keeps them from truncating data in query responses? I’m working with OSS InfluxDB version 1.2.1 and Chronograf version 1.2.0-beta5.
My graph and the original query:
The number of points I’d expect to see:
The number of points I’m seeing based on the timestamps in the graph:
A: InfluxDB has a configuration option called
max-row-limit. That option sets the maximum number of rows returned per query. In OSS version 1.2.1, the system sets that option to 10,000 by default; that’s why you’re seeing only 10,000 points in your graph. To disable the configuration option, just set
0 and restart the process. The
0 allows for an unlimited number of rows returned per query.
Just a side note about your issue - in the most recent version of InfluxDB, v1.2.2, we’ve changed the default
max-row-limit setting to
Unexpected change in query behavior
Q: I’ve recently upgraded to OSS InfluxDB version 1.2.1 and am seeing a change in the number of points returned for a query that performs math on several selector functions. Was that change intentional? Is there a way to make the system behave like it did in version 1.1.1?
Query behaviour in version 1.1.1:
> SELECT MIN("avocado")*2,MAX("avocado")*2 FROM "mycart" name: mycart time min max ---- --- --- 0 24 46 <--- Just one point!
Query behavior in version 1.2.1:
> SELECT MIN("avocado")*2,MAX("avocado")*2 FROM "mycart" name: mycart time min max ---- --- --- 1490113486589201368 24 | 1490113497387418180 46 | <--- Two points!
A: That change is a known issue - we apologize for the unexpected change in behavior. We have a fix for it that will be part of the version 1.3.0 release! For now, as a workaround, you can use InfluxQL’s subqueries to replicate the behavior that you saw in version 1.1.1:
> SELECT "min"*2,"max"*2 FROM (SELECT MIN("avocado"),MAX("avocado") FROM "mycart") name: mycart time min max ---- --- --- 0 24 46
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