Failed to connect/Error was 'unsupported scheme

[coolblknerd]

I've been trying to configure the telegraf agent on some nodes however I can't get the agent to pick up my URL value that's using a environment variable. I understand that 1.11 introduced the ${} syntax, however, whether I uses the new or old syntax, the environment variable isn't getting picked up.

Relevant telegraf.conf:

urls = ["${INFLUXDB_URI}"] or urls = ["$INFLUXDB_URI"]

System info:

Telegraf: 1.15.3
Ubuntu 20.04 LTS

Steps to reproduce:

1. Install Telegraf
2. Create environment variable INFLUXDB_URI
3. Create telegraf.conf file with urls attribute updated with either "[$INFLUXDB_URI]" or "[${INFLUXDB_URI}]"
4. Attempt to start telegraf
5. Run 'service telegraf status"

Expected behavior:

Expect Telegraf to connect to the given InfluxDB URI without any errors.

Actual behavior:

Receiving "[agent] Failed to connect to [outputs.influxdb], retrying in 15s, error was 'unsupported scheme ["$INFLUXDB_URI"]: "

Additional info:

[sjwang90]

Can you the full config for your outputs.influxdb?

[coolblknerd]

Here ya go @sjwang90

[[outputs.influxdb]]
urls = ["$INFLUXDB_URI"] 
database = "telegraf" ]
retention_policy = ""
write_consistency = "any"
timeout = "5s"
username = "telegraf"
password = *****
user_agent = "selenoid"

[sjwang90]

That error message doesn't correspond this problem, but at first glance the ] in the database = "telegraf" ] shouldn't be there.

Can you run check the environment variable you set for your URL. Here's some documentation around it that may help.

[sjwang90]

Hey @coolblknerd just checking if this is still a problem. Closing this issue for now. Please reach out to us in our Community Slack or Community Page as it'll be a better place to get this question answered.

[alteredtech]

I am getting this issue as well.
Ubuntu 20.04.2 LTS
Telegraf 1.18.0

here is my /etc/telegraf/telegraf.d/outputs.influxdb.conf

[[outputs.influxdb]]
    urls = ["${INFLUX_URL}"]
    database = "pihole"
    ## HTTP Basic Auth
    username = "${INFLUX_USER}"
    password = "${INFLUX_PWD}"
    namepass = ["pihole_stats*"]

Here is my /etc/default/telegraf

INFLUX_URL = "http://10.0.0.5:8086"
INFLUX_USER = "telegraf"
INFLUX_PWD = "somepassword"

then my /etc/telegraf/telegraf.d/inputs.pihole.conf for good measure

[[inputs.http]]
    #pihole URL for data in json format
    urls=["http://10.0.0.5:8080/admin/api.php"]

    method = "GET"

    #Overwrite measurement name from default http to pihole_stats
    name_override = "pihole_stats"

    timeout = "10s"

    #exclude host items from tags
    tagexclude = ["host"]

    #data from http in JSON format
    data_format = "json"

    #JSON values to set as string fields
    json_string_fields = ["url","status"]

    insecure_skip_verify = true

print of my sudo -u telegraf printenv

LC_TERMINAL=iTerm2
TERM=xterm-256color
LC_TERMINAL_VERSION=3.4.4
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin
MAIL=/var/mail/telegraf
LOGNAME=telegraf
USER=telegraf
HOME=/etc/telegraf
SHELL=/bin/false
SUDO_COMMAND=/usr/bin/printenv
SUDO_USER=ubuntu
SUDO_UID=1000
SUDO_GID=1000

Another note, when I run telegraf --test, it is meant to pull from the telegraf.d and essentially make one large conf file correct? That is what I read here #6334