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diff --git a/exporting/README.md b/exporting/README.md new file mode 100644 index 0000000..933de0e --- /dev/null +++ b/exporting/README.md @@ -0,0 +1,312 @@ +<!-- +title: "Exporting engine reference" +description: "With the exporting engine, you can archive your Netdata metrics to multiple external databases for long-term storage or further analysis." +sidebar_label: Reference guide +custom_edit_url: https://github.com/netdata/netdata/edit/master/exporting/README.md +--> + +# Exporting engine reference + +Welcome to the exporting engine reference guide. This guide contains comprehensive information about enabling, +configuring, and monitoring Netdata's exporting engine, which allows you to send metrics to external time-series +databases. + +For a quick introduction to the exporting engine's features, read our doc on [exporting metrics to time-series +databases](/docs/export/external-databases.md), or jump in to [enabling a connector](/docs/export/enable-connector.md). + +The exporting engine has a modular structure and supports metric exporting via multiple exporting connector instances at +the same time. You can have different update intervals and filters configured for every exporting connector instance. + +When you enable the exporting engine and a connector, the Netdata Agent exports metrics _beginning from the time you +restart its process_, not the entire [database of long-term metrics](/docs/store/change-metrics-storage.md). + +The exporting engine has its own configuration file `exporting.conf`. The configuration is almost similar to the +deprecated [backends](/backends/README.md#configuration) system. The most important difference is that type of a +connector should be specified in a section name before a colon and an instance name after the colon. Also, you can't use +`host tags` anymore. Set your labels using the [`[host labels]`](/docs/guides/using-host-labels.md) section in +`netdata.conf`. + +Since Netdata collects thousands of metrics per server per second, which would easily congest any database server when +several Netdata servers are sending data to it, Netdata allows sending metrics at a lower frequency, by resampling them. + +So, although Netdata collects metrics every second, it can send to the external database servers averages or sums every +X seconds (though, it can send them per second if you need it to). + +## Features + +1. The exporting engine uses a number of connectors to send Netdata metrics to external time-series databases. See our + [list of supported databases](/docs/export/external-databases.md#supported-databases) for information on which + connector to enable and configure for your database of choice. + + - [**AWS Kinesis Data Streams**](/exporting/aws_kinesis/README.md): Metrics are sent to the service in `JSON` + format. + - [**Google Cloud Pub/Sub Service**](/exporting/pubsub/README.md): Metrics are sent to the service in `JSON` + format. + - [**Graphite**](/exporting/graphite/README.md): A plaintext interface. Metrics are sent to the database server as + `prefix.hostname.chart.dimension`. `prefix` is configured below, `hostname` is the hostname of the machine (can + also be configured). Learn more in our guide to [export and visualize Netdata metrics in + Graphite](/docs/guides/export/export-netdata-metrics-graphite.md). + - [**JSON** document databases](/exporting/json/README.md) + - [**OpenTSDB**](/exporting/opentsdb/README.md): Use a plaintext or HTTP interfaces. Metrics are sent to + OpenTSDB as `prefix.chart.dimension` with tag `host=hostname`. + - [**MongoDB**](/exporting/mongodb/README.md): Metrics are sent to the database in `JSON` format. + - [**Prometheus**](/exporting/prometheus/README.md): Use an existing Prometheus installation to scrape metrics + from node using the Netdata API. + - [**Prometheus remote write**](/exporting/prometheus/remote_write/README.md). A binary snappy-compressed protocol + buffer encoding over HTTP. Supports many [storage + providers](https://prometheus.io/docs/operating/integrations/#remote-endpoints-and-storage). + - [**TimescaleDB**](/exporting/TIMESCALE.md): Use a community-built connector that takes JSON streams from a + Netdata client and writes them to a TimescaleDB table. + +2. Netdata can filter metrics (at the chart level), to send only a subset of the collected metrics. + +3. Netdata supports three modes of operation for all exporting connectors: + + - `as-collected` sends to external databases the metrics as they are collected, in the units they are collected. + So, counters are sent as counters and gauges are sent as gauges, much like all data collectors do. For example, + to calculate CPU utilization in this format, you need to know how to convert kernel ticks to percentage. + + - `average` sends to external databases normalized metrics from the Netdata database. In this mode, all metrics + are sent as gauges, in the units Netdata uses. This abstracts data collection and simplifies visualization, but + you will not be able to copy and paste queries from other sources to convert units. For example, CPU utilization + percentage is calculated by Netdata, so Netdata will convert ticks to percentage and send the average percentage + to the external database. + + - `sum` or `volume`: the sum of the interpolated values shown on the Netdata graphs is sent to the external + database. So, if Netdata is configured to send data to the database every 10 seconds, the sum of the 10 values + shown on the Netdata charts will be used. + + Time-series databases suggest to collect the raw values (`as-collected`). If you plan to invest on building your + monitoring around a time-series database and you already know (or you will invest in learning) how to convert units + and normalize the metrics in Grafana or other visualization tools, we suggest to use `as-collected`. + + If, on the other hand, you just need long term archiving of Netdata metrics and you plan to mainly work with + Netdata, we suggest to use `average`. It decouples visualization from data collection, so it will generally be a lot + simpler. Furthermore, if you use `average`, the charts shown in the external service will match exactly what you + see in Netdata, which is not necessarily true for the other modes of operation. + +4. This code is smart enough, not to slow down Netdata, independently of the speed of the external database server. You + should keep in mind though that many exporting connector instances can consume a lot of CPU resources if they run + their batches at the same time. You can set different update intervals for every exporting connector instance, but + even in that case they can occasionally synchronize their batches for a moment. + +## Configuration + +Here are the configuration blocks for every supported connector. Your current `exporting.conf` file may look a little +different. + +You can configure each connector individually using the available [options](#options). The +`[graphite:my_graphite_instance]` block contains examples of some of these additional options in action. + +```conf +[exporting:global] + enabled = yes + send configured labels = no + send automatic labels = no + update every = 10 + +[prometheus:exporter] + send names instead of ids = yes + send configured labels = yes + end automatic labels = no + send charts matching = * + send hosts matching = localhost * + prefix = netdata + +[graphite:my_graphite_instance] + enabled = yes + destination = localhost:2003 + data source = average + prefix = Netdata + hostname = my-name + update every = 10 + buffer on failures = 10 + timeout ms = 20000 + send charts matching = * + send hosts matching = localhost * + send names instead of ids = yes + send configured labels = yes + send automatic labels = yes + +[prometheus_remote_write:my_prometheus_remote_write_instance] + enabled = yes + destination = localhost + remote write URL path = /receive + +[kinesis:my_kinesis_instance] + enabled = yes + destination = us-east-1 + stream name = netdata + aws_access_key_id = my_access_key_id + aws_secret_access_key = my_aws_secret_access_key + +[pubsub:my_pubsub_instance] + enabled = yes + destination = pubsub.googleapis.com + credentials file = /etc/netdata/pubsub_credentials.json + project id = my_project + topic id = my_topic + +[mongodb:my_mongodb_instance] + enabled = yes + destination = localhost + database = my_database + collection = my_collection + +[json:my_json_instance] + enabled = yes + destination = localhost:5448 + +[opentsdb:my_opentsdb_plaintext_instance] + enabled = yes + destination = localhost:4242 + +[opentsdb:http:my_opentsdb_http_instance] + enabled = yes + destination = localhost:4242 + +[opentsdb:https:my_opentsdb_https_instance] + enabled = yes + destination = localhost:8082 +``` + +### Sections + +- `[exporting:global]` is a section where you can set your defaults for all exporting connectors +- `[prometheus:exporter]` defines settings for Prometheus exporter API queries (e.g.: + `http://NODE:19999/api/v1/allmetrics?format=prometheus&help=yes&source=as-collected`). +- `[<type>:<name>]` keeps settings for a particular exporting connector instance, where: + - `type` selects the exporting connector type: graphite | opentsdb:telnet | opentsdb:http | + prometheus_remote_write | json | kinesis | pubsub | mongodb. For graphite, opentsdb, + json, and prometheus_remote_write connectors you can also use `:http` or `:https` modifiers + (e.g.: `opentsdb:https`). + - `name` can be arbitrary instance name you chose. + +### Options + +Configure individual connectors and override any global settings with the following options. + +- `enabled = yes | no`, enables or disables an exporting connector instance + +- `destination = host1 host2 host3 ...`, accepts **a space separated list** of hostnames, IPs (IPv4 and IPv6) and + ports to connect to. Netdata will use the **first available** to send the metrics. + + The format of each item in this list, is: `[PROTOCOL:]IP[:PORT]`. + + `PROTOCOL` can be `udp` or `tcp`. `tcp` is the default and only supported by the current exporting engine. + + `IP` can be `XX.XX.XX.XX` (IPv4), or `[XX:XX...XX:XX]` (IPv6). For IPv6 you can to enclose the IP in `[]` to + separate it from the port. + + `PORT` can be a number of a service name. If omitted, the default port for the exporting connector will be used + (graphite = 2003, opentsdb = 4242). + + Example IPv4: + +```conf + destination = 10.11.14.2:4242 10.11.14.3:4242 10.11.14.4:4242 +``` + + Example IPv6 and IPv4 together: + +```conf + destination = [ffff:...:0001]:2003 10.11.12.1:2003 +``` + + When multiple servers are defined, Netdata will try the next one when the previous one fails. + + Netdata also ships `nc-exporting.sh`, a script that can be used as a fallback exporting connector to save the + metrics to disk and push them to the time-series database when it becomes available again. It can also be used to + monitor / trace / debug the metrics Netdata generates. + + For the Kinesis exporting connector `destination` should be set to an AWS region (for example, `us-east-1`). + + For the MongoDB exporting connector `destination` should be set to a + [MongoDB URI](https://docs.mongodb.com/manual/reference/connection-string/). + + For the Pub/Sub exporting connector `destination` can be set to a specific service endpoint. + +- `data source = as collected`, or `data source = average`, or `data source = sum`, selects the kind of data that will + be sent to the external database. + +- `hostname = my-name`, is the hostname to be used for sending data to the external database server. By default this + is `[global].hostname`. + +- `prefix = Netdata`, is the prefix to add to all metrics. + +- `update every = 10`, is the number of seconds between sending data to the external database. Netdata will add some + randomness to this number, to prevent stressing the external server when many Netdata servers send data to the same + database. This randomness does not affect the quality of the data, only the time they are sent. + +- `buffer on failures = 10`, is the number of iterations (each iteration is `update every` seconds) to buffer data, + when the external database server is not available. If the server fails to receive the data after that many + failures, data loss on the connector instance is expected (Netdata will also log it). + +- `timeout ms = 20000`, is the timeout in milliseconds to wait for the external database server to process the data. + By default this is `2 * update_every * 1000`. + +- `send hosts matching = localhost *` includes one or more space separated patterns, using `*` as wildcard (any number + of times within each pattern). The patterns are checked against the hostname (the localhost is always checked as + `localhost`), allowing us to filter which hosts will be sent to the external database when this Netdata is a central + Netdata aggregating multiple hosts. A pattern starting with `!` gives a negative match. So to match all hosts named + `*db*` except hosts containing `*child*`, use `!*child* *db*` (so, the order is important: the first + pattern matching the hostname will be used - positive or negative). + +- `send charts matching = *` includes one or more space separated patterns, using `*` as wildcard (any number of times + within each pattern). The patterns are checked against both chart id and chart name. A pattern starting with `!` + gives a negative match. So to match all charts named `apps.*` except charts ending in `*reads`, use `!*reads + apps.*` (so, the order is important: the first pattern matching the chart id or the chart name will be used - + positive or negative). + +- `send names instead of ids = yes | no` controls the metric names Netdata should send to the external database. + Netdata supports names and IDs for charts and dimensions. Usually IDs are unique identifiers as read by the system + and names are human friendly labels (also unique). Most charts and metrics have the same ID and name, but in several + cases they are different: disks with device-mapper, interrupts, QoS classes, statsd synthetic charts, etc. + +- `send configured labels = yes | no` controls if labels defined in the `[host labels]` section in `netdata.conf` + should be sent to the external database + +- `send automatic labels = yes | no` controls if automatically created labels, like `_os_name` or `_architecture` + should be sent to the external database + +> Starting from Netdata v1.20 the host tags (defined in the `[backend]` section of `netdata.conf`) are parsed in +> accordance with a configured backend type and stored as host labels so that they can be reused in API responses and +> exporting connectors. The parsing is supported for graphite, json, opentsdb, and prometheus (default) backend types. +> You can check how the host tags were parsed using the /api/v1/info API call. But, keep in mind that backends subsystem +> is deprecated and will be deleted soon. Please move your existing tags to the `[host labels]` section. + +## HTTPS + +Netdata can send metrics to external databases using the TLS/SSL protocol. Unfortunately, some of +them does not support encrypted connections, so you will have to configure a reverse proxy to enable +HTTPS communication between Netdata and an external database. You can set up a reverse proxy with +[Nginx](/docs/Running-behind-nginx.md). + +## Exporting engine monitoring + +Netdata creates five charts in the dashboard, under the **Netdata Monitoring** section, to help you monitor the health +and performance of the exporting engine itself: + +1. **Buffered metrics**, the number of metrics Netdata added to the buffer for dispatching them to the + external database server. + +2. **Exporting data size**, the amount of data (in KB) Netdata added the buffer. + +3. **Exporting operations**, the number of operations performed by Netdata. + +4. **Exporting thread CPU usage**, the CPU resources consumed by the Netdata thread, that is responsible for sending + the metrics to the external database server. + + + +## Exporting engine alarms + +Netdata adds 3 alarms: + +1. `exporting_last_buffering`, number of seconds since the last successful buffering of exported data +2. `exporting_metrics_sent`, percentage of metrics sent to the external database server +3. `exporting_metrics_lost`, number of metrics lost due to repeating failures to contact the external database server + + + +[](<>) |