influxDB + Telegraf: Connection refused

Hello everybody,

I want to use influxDB with telegraf, but telegraf connection is refused by the influxDB.

My Story

Fundamentals:

  • create a network: docker network create --driver bridge influxdb-telegraf-net
  • create a volume: docker volume create influxDBTelegraf
  1. First, I run my influxDB Container:
docker run -d --name=influxdb -p 8086:8086 -v influxDBTelegraf:/root/.influxdb2 --net=influxdb-telegraf-net  influxdb
  1. Then I setup the first parameters after localhost:8086 and named my bucket myfirstbucket.

  2. After that, I configure my first CPU telegraf data source (see config file below). Additional, I download the .config and save the file as telegraf.config in…/Users/Programming/Documents/telegraf. You finde the telegraf.config in the appendix below.

  3. Then I start telegraf:

  • docker pull telegraf
  • docker run --net=influxdb-telegraf-net -v $PWD/telegraf.conf:/etc/telegraf/telegraf.conf:ro telegraf

Now, all my container are running and I start to configure my APIToken and execute the following statements in the terminal of the telegraf container.

  • export INFLUX_TOKEN=NKt6_bvgkPwAkqkKdx_xeFI4EoB4mas0T6nx2BgZ7ieyE2HJTaelttZEPglS2p1CPyO0gnRUBHKvFy_Oyc8JjA==
  • telegraf --config http://localhost:8086/api/v2/telegrafs/0af7bb2bbd6cc000

NOW, here comes my problem


export INFLUX_TOKEN=NKt6_bvgkPwAkqkKdx_xeFI4EoB4mas0T6nx2BgZ7ieyE2HJTaelttZEPglS2p1CPyO0gnRUBHKvFy_Oyc8JjA==
telegraf --config http://localhost:8086/api/v2/telegrafs/0af7bb2bbd6cc000


2023-03-29T19:57:14Z I! Loading config url: http://localhost:8086/api/v2/telegrafs/0af7bb2bbd6cc000
2023-03-29T19:57:14Z E! error loading config file http://localhost:8086/api/v2/telegrafs/0af7bb2bbd6cc000: retry 0 of 3 failed connecting to HTTP config server: Get "http://localhost:8086/api/v2/telegrafs/0af7bb2bbd6cc000": dial tcp 127.0.0.1:8086: connect: connection refused

Why is the connection refused? :face_with_raised_eyebrow:
I hope you can help to find the error.

Thanks a lot.

With regards
Christian

Appendix

> # Configuration for telegraf agent
> [agent]
>   ## Default data collection interval for all inputs
>   interval = "10s"
>   ## Rounds collection interval to 'interval'
>   ## ie, if interval="10s" then always collect on :00, :10, :20, etc.
>   round_interval = true
> 
>   ## Telegraf will send metrics to outputs in batches of at most
>   ## metric_batch_size metrics.
>   ## This controls the size of writes that Telegraf sends to output plugins.
>   metric_batch_size = 1000
> 
>   ## Maximum number of unwritten metrics per output.  Increasing this value
>   ## allows for longer periods of output downtime without dropping metrics at the
>   ## cost of higher maximum memory usage.
>   metric_buffer_limit = 10000
> 
>   ## Collection jitter is used to jitter the collection by a random amount.
>   ## Each plugin will sleep for a random time within jitter before collecting.
>   ## This can be used to avoid many plugins querying things like sysfs at the
>   ## same time, which can have a measurable effect on the system.
>   collection_jitter = "0s"
> 
>   ## Default flushing interval for all outputs. Maximum flush_interval will be
>   ## flush_interval + flush_jitter
>   flush_interval = "10s"
>   ## Jitter the flush interval by a random amount. This is primarily to avoid
>   ## large write spikes for users running a large number of telegraf instances.
>   ## ie, a jitter of 5s and interval 10s means flushes will happen every 10-15s
>   flush_jitter = "0s"
> 
>   ## By default or when set to "0s", precision will be set to the same
>   ## timestamp order as the collection interval, with the maximum being 1s.
>   ##   ie, when interval = "10s", precision will be "1s"
>   ##       when interval = "250ms", precision will be "1ms"
>   ## Precision will NOT be used for service inputs. It is up to each individual
>   ## service input to set the timestamp at the appropriate precision.
>   ## Valid time units are "ns", "us" (or "µs"), "ms", "s".
>   precision = ""
> 
>   ## Log at debug level.
>   # debug = false
>   ## Log only error level messages.
>   # quiet = false
> 
>   ## Log target controls the destination for logs and can be one of "file",
>   ## "stderr" or, on Windows, "eventlog".  When set to "file", the output file
>   ## is determined by the "logfile" setting.
>   # logtarget = "file"
> 
>   ## Name of the file to be logged to when using the "file" logtarget.  If set to
>   ## the empty string then logs are written to stderr.
>   # logfile = ""
> 
>   ## The logfile will be rotated after the time interval specified.  When set
>   ## to 0 no time based rotation is performed.  Logs are rotated only when
>   ## written to, if there is no log activity rotation may be delayed.
>   # logfile_rotation_interval = "0d"
> 
>   ## The logfile will be rotated when it becomes larger than the specified
>   ## size.  When set to 0 no size based rotation is performed.
>   # logfile_rotation_max_size = "0MB"
> 
>   ## Maximum number of rotated archives to keep, any older logs are deleted.
>   ## If set to -1, no archives are removed.
>   # logfile_rotation_max_archives = 5
> 
>   ## Pick a timezone to use when logging or type 'local' for local time.
>   ## Example: America/Chicago
>   # log_with_timezone = ""
> 
>   ## Override default hostname, if empty use os.Hostname()
>   hostname = ""
>   ## If set to true, do no set the "host" tag in the telegraf agent.
>   omit_hostname = false
> [[outputs.influxdb_v2]]
>   ## The URLs of the InfluxDB cluster nodes.
>   ##
>   ## Multiple URLs can be specified for a single cluster, only ONE of the
>   ## urls will be written to each interval.
>   ##   ex: urls = ["https://us-west-2-1.aws.cloud2.influxdata.com"]
>   urls = ["http://localhost:8086"]
> 
>   ## Token for authentication.
>   token = "$INFLUX_TOKEN"
> 
>   ## Organization is the name of the organization you wish to write to; must exist.
>   organization = "admin"
> 
>   ## Destination bucket to write into.
>   bucket = "myfirstbucket"
> 
>   ## The value of this tag will be used to determine the bucket.  If this
>   ## tag is not set the 'bucket' option is used as the default.
>   # bucket_tag = ""
> 
>   ## If true, the bucket tag will not be added to the metric.
>   # exclude_bucket_tag = false
> 
>   ## Timeout for HTTP messages.
>   # timeout = "5s"
> 
>   ## Additional HTTP headers
>   # http_headers = {"X-Special-Header" = "Special-Value"}
> 
>   ## HTTP Proxy override, if unset values the standard proxy environment
>   ## variables are consulted to determine which proxy, if any, should be used.
>   # http_proxy = "http://corporate.proxy:3128"
> 
>   ## HTTP User-Agent
>   # user_agent = "telegraf"
> 
>   ## Content-Encoding for write request body, can be set to "gzip" to
>   ## compress body or "identity" to apply no encoding.
>   # content_encoding = "gzip"
> 
>   ## Enable or disable uint support for writing uints influxdb 2.0.
>   # influx_uint_support = false
> 
>   ## Optional TLS Config for use on HTTP connections.
>   # tls_ca = "/etc/telegraf/ca.pem"
>   # tls_cert = "/etc/telegraf/cert.pem"
>   # tls_key = "/etc/telegraf/key.pem"
>   ## Use TLS but skip chain & host verification
>   # insecure_skip_verify = false
> # Read metrics about cpu usage
> [[inputs.cpu]]
>   ## Whether to report per-cpu stats or not
>   percpu = true
>   ## Whether to report total system cpu stats or not
>   totalcpu = true
>   ## If true, collect raw CPU time metrics
>   collect_cpu_time = false
>   ## If true, compute and report the sum of all non-idle CPU states
>   report_active = false

Hi @Christian01,
So this is a docker network issue. In this case since they will both live via the same docker virtual network you should refer to the URL like so:

http://influxdb:8086/path/to/telegraf

Here is a good example: InfluxDB-Roadshow-Training/docker-compose.yml at master · InfluxCommunity/InfluxDB-Roadshow-Training · GitHub

Hi, @Jay_Clifford @Christian01

i suppose here the issue is when you use localhost:8086 it goes to the 8086 port of docker container, while in actual the localhost you refer is your system, so you need to replace this with your ipv4 address. or in other words
.conf file goes in docker container localhost within the Docker container refers to the container itself, not the hostIPV4. So we can update this to something like this

urls = [“http://172.30.96.1:8086/”]

P.S. :smile: I know it’s 1 year since the problem occurred to you and by now you would have resolved it, but i just started in IT.