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