taosAdapter Reference Guide

taosAdapter is a TDengine companion tool that acts as a bridge and adapter between TDengine clusters and applications. It provides an easy-to-use and efficient way to ingest data directly from data collection agent software such as Telegraf, StatsD, collectd, etc. It also provides an InfluxDB/OpenTSDB compatible data ingestion interface that allows InfluxDB/OpenTSDB applications to be seamlessly ported to TDengine.

taosAdapter provides the following features.

• RESTful interface
• InfluxDB v1 compliant write interface
• OpenTSDB JSON and telnet format writes compatible
• Seamless connection to Telegraf
• Seamless connection to collectd
• Seamless connection to StatsD
• Supports Prometheus remote_read and remote_write
• Get table's VGroup ID

taosAdapter architecture diagram

taosAdapter Deployment Method

Install taosAdapter

If you use the TDengine server, you don't need additional steps to install taosAdapter. If you need to deploy taosAdapter separately on another server other than the TDengine server, you should install the full TDengine server package on that server to install taosAdapter. If you need to build taosAdapter from source code, you can refer to the Building taosAdapter documentation.

Start/Stop taosAdapter

On Linux systems, the taosAdapter service is managed by systemd by default. You can use the command systemctl start taosadapter to start the taosAdapter service and use the command systemctl stop taosadapter to stop the taosAdapter service.

Remove taosAdapter

Use the command rmtaos to remove the TDengine server software if you use tar.gz package. If you installed using a .deb or .rpm package, use the corresponding command, for your package manager, like apt or rpm to remove the TDengine server, including taosAdapter.

Upgrade taosAdapter

taosAdapter and TDengine server need to use the same version. Please upgrade the taosAdapter by upgrading the TDengine server. You need to upgrade the taosAdapter deployed separately from TDengine server by upgrading the TDengine server on the deployed server.

taosAdapter parameter list

taosAdapter is configurable via command-line arguments, environment variables and configuration files. The default configuration file is /etc/taos/taosadapter.toml on Linux.

Command-line arguments take precedence over environment variables over configuration files. The command-line usage is arg=val, e.g., taosadapter -p=30000 --debug=true. The detailed list is as follows:

Usage of taosAdapter:
      --collectd.db string                           collectd db name. Env "TAOS_ADAPTER_COLLECTD_DB" (default "collectd")
      --collectd.enable                              enable collectd. Env "TAOS_ADAPTER_COLLECTD_ENABLE" (default true)
      --collectd.password string                     collectd password. Env "TAOS_ADAPTER_COLLECTD_PASSWORD" (default "taosdata")
      --collectd.port int                            collectd server port. Env "TAOS_ADAPTER_COLLECTD_PORT" (default 6045)
      --collectd.ttl int                             collectd data ttl. Env "TAOS_ADAPTER_COLLECTD_TTL"
      --collectd.user string                         collectd user. Env "TAOS_ADAPTER_COLLECTD_USER" (default "root")
      --collectd.worker int                          collectd write worker. Env "TAOS_ADAPTER_COLLECTD_WORKER" (default 10)
  -c, --config string                                config path default /etc/taos/taosadapter.toml
      --cors.allowAllOrigins                         cors allow all origins. Env "TAOS_ADAPTER_CORS_ALLOW_ALL_ORIGINS" (default true)
      --cors.allowCredentials                        cors allow credentials. Env "TAOS_ADAPTER_CORS_ALLOW_Credentials"
      --cors.allowHeaders stringArray                cors allow HEADERS. Env "TAOS_ADAPTER_ALLOW_HEADERS"
      --cors.allowOrigins stringArray                cors allow origins. Env "TAOS_ADAPTER_ALLOW_ORIGINS"
      --cors.allowWebSockets                         cors allow WebSockets. Env "TAOS_ADAPTER_CORS_ALLOW_WebSockets"
      --cors.exposeHeaders stringArray               cors expose headers. Env "TAOS_ADAPTER_Expose_Headers"
      --debug                                        enable debug mode. Env "TAOS_ADAPTER_DEBUG" (default true)
      --help                                         Print this help message and exit
      --httpCodeServerError                          Use a non-200 http status code when server returns an error. Env "TAOS_ADAPTER_HTTP_CODE_SERVER_ERROR"
      --influxdb.enable                              enable influxdb. Env "TAOS_ADAPTER_INFLUXDB_ENABLE" (default true)
      --instanceId int                               instance ID. Env "TAOS_ADAPTER_INSTANCE_ID" (default 32)
      --log.compress                                 whether to compress old log. Env "TAOS_ADAPTER_LOG_COMPRESS"
      --log.enableRecordHttpSql                      whether to record http sql. Env "TAOS_ADAPTER_LOG_ENABLE_RECORD_HTTP_SQL"
      --log.level string                             log level (trace debug info warning error). Env "TAOS_ADAPTER_LOG_LEVEL" (default "info")
      --log.path string                              log path. Env "TAOS_ADAPTER_LOG_PATH" (default "/var/log/taos")
      --log.reservedDiskSize string                  reserved disk size for log dir (KB MB GB), must be a positive integer. Env "TAOS_ADAPTER_LOG_RESERVED_DISK_SIZE" (default "1GB")
      --log.rotationCount uint                       log rotation count. Env "TAOS_ADAPTER_LOG_ROTATION_COUNT" (default 30)
      --log.rotationSize string                      log rotation size(KB MB GB), must be a positive integer. Env "TAOS_ADAPTER_LOG_ROTATION_SIZE" (default "1GB")
      --log.rotationTime duration                    deprecated: log rotation time always 24 hours. Env "TAOS_ADAPTER_LOG_ROTATION_TIME" (default 24h0m0s)
      --log.sqlRotationCount uint                    record sql log rotation count. Env "TAOS_ADAPTER_LOG_SQL_ROTATION_COUNT" (default 2)
      --log.sqlRotationSize string                   record sql log rotation size(KB MB GB), must be a positive integer. Env "TAOS_ADAPTER_LOG_SQL_ROTATION_SIZE" (default "1GB")
      --log.sqlRotationTime duration                 record sql log rotation time. Env "TAOS_ADAPTER_LOG_SQL_ROTATION_TIME" (default 24h0m0s)
      --logLevel string                              log level (trace debug info warning error). Env "TAOS_ADAPTER_LOG_LEVEL" (default "info")
      --monitor.collectDuration duration             Set monitor duration. Env "TAOS_ADAPTER_MONITOR_COLLECT_DURATION" (default 3s)
      --monitor.disable                              Whether to disable monitoring. Env "TAOS_ADAPTER_MONITOR_DISABLE" (default true)
      --monitor.identity string                      The identity of the current instance, or 'hostname:port' if it is empty. Env "TAOS_ADAPTER_MONITOR_IDENTITY"
      --monitor.incgroup                             Whether running in cgroup. Env "TAOS_ADAPTER_MONITOR_INCGROUP"
      --monitor.pauseAllMemoryThreshold float        Memory percentage threshold for pause all. Env "TAOS_ADAPTER_MONITOR_PAUSE_ALL_MEMORY_THRESHOLD" (default 80)
      --monitor.pauseQueryMemoryThreshold float      Memory percentage threshold for pause query. Env "TAOS_ADAPTER_MONITOR_PAUSE_QUERY_MEMORY_THRESHOLD" (default 70)
      --node_exporter.caCertFile string              node_exporter ca cert file path. Env "TAOS_ADAPTER_NODE_EXPORTER_CA_CERT_FILE"
      --node_exporter.certFile string                node_exporter cert file path. Env "TAOS_ADAPTER_NODE_EXPORTER_CERT_FILE"
      --node_exporter.db string                      node_exporter db name. Env "TAOS_ADAPTER_NODE_EXPORTER_DB" (default "node_exporter")
      --node_exporter.enable                         enable node_exporter. Env "TAOS_ADAPTER_NODE_EXPORTER_ENABLE"
      --node_exporter.gatherDuration duration        node_exporter gather duration. Env "TAOS_ADAPTER_NODE_EXPORTER_GATHER_DURATION" (default 5s)
      --node_exporter.httpBearerTokenString string   node_exporter http bearer token. Env "TAOS_ADAPTER_NODE_EXPORTER_HTTP_BEARER_TOKEN_STRING"
      --node_exporter.httpPassword string            node_exporter http password. Env "TAOS_ADAPTER_NODE_EXPORTER_HTTP_PASSWORD"
      --node_exporter.httpUsername string            node_exporter http username. Env "TAOS_ADAPTER_NODE_EXPORTER_HTTP_USERNAME"
      --node_exporter.insecureSkipVerify             node_exporter skip ssl check. Env "TAOS_ADAPTER_NODE_EXPORTER_INSECURE_SKIP_VERIFY" (default true)
      --node_exporter.keyFile string                 node_exporter cert key file path. Env "TAOS_ADAPTER_NODE_EXPORTER_KEY_FILE"
      --node_exporter.password string                node_exporter password. Env "TAOS_ADAPTER_NODE_EXPORTER_PASSWORD" (default "taosdata")
      --node_exporter.responseTimeout duration       node_exporter response timeout. Env "TAOS_ADAPTER_NODE_EXPORTER_RESPONSE_TIMEOUT" (default 5s)
      --node_exporter.ttl int                        node_exporter data ttl. Env "TAOS_ADAPTER_NODE_EXPORTER_TTL"
      --node_exporter.urls strings                   node_exporter urls. Env "TAOS_ADAPTER_NODE_EXPORTER_URLS" (default [http://localhost:9100])
      --node_exporter.user string                    node_exporter user. Env "TAOS_ADAPTER_NODE_EXPORTER_USER" (default "root")
      --opentsdb.enable                              enable opentsdb. Env "TAOS_ADAPTER_OPENTSDB_ENABLE" (default true)
      --opentsdb_telnet.batchSize int                opentsdb_telnet batch size. Env "TAOS_ADAPTER_OPENTSDB_TELNET_BATCH_SIZE" (default 1)
      --opentsdb_telnet.dbs strings                  opentsdb_telnet db names. Env "TAOS_ADAPTER_OPENTSDB_TELNET_DBS" (default [opentsdb_telnet,collectd_tsdb,icinga2_tsdb,tcollector_tsdb])
      --opentsdb_telnet.enable                       enable opentsdb telnet,warning: without auth info(default false). Env "TAOS_ADAPTER_OPENTSDB_TELNET_ENABLE"
      --opentsdb_telnet.flushInterval duration       opentsdb_telnet flush interval (0s means not valid) . Env "TAOS_ADAPTER_OPENTSDB_TELNET_FLUSH_INTERVAL"
      --opentsdb_telnet.maxTCPConnections int        max tcp connections. Env "TAOS_ADAPTER_OPENTSDB_TELNET_MAX_TCP_CONNECTIONS" (default 250)
      --opentsdb_telnet.password string              opentsdb_telnet password. Env "TAOS_ADAPTER_OPENTSDB_TELNET_PASSWORD" (default "taosdata")
      --opentsdb_telnet.ports ints                   opentsdb telnet tcp port. Env "TAOS_ADAPTER_OPENTSDB_TELNET_PORTS" (default [6046,6047,6048,6049])
      --opentsdb_telnet.tcpKeepAlive                 enable tcp keep alive. Env "TAOS_ADAPTER_OPENTSDB_TELNET_TCP_KEEP_ALIVE"
      --opentsdb_telnet.ttl int                      opentsdb_telnet data ttl. Env "TAOS_ADAPTER_OPENTSDB_TELNET_TTL"
      --opentsdb_telnet.user string                  opentsdb_telnet user. Env "TAOS_ADAPTER_OPENTSDB_TELNET_USER" (default "root")
      --pool.idleTimeout duration                    Set idle connection timeout. Env "TAOS_ADAPTER_POOL_IDLE_TIMEOUT"
      --pool.maxConnect int                          max connections to server. Env "TAOS_ADAPTER_POOL_MAX_CONNECT"
      --pool.maxIdle int                             max idle connections to server. Env "TAOS_ADAPTER_POOL_MAX_IDLE"
      --pool.maxWait int                             max count of waiting for connection. Env "TAOS_ADAPTER_POOL_MAX_WAIT"
      --pool.waitTimeout int                         wait for connection timeout seconds. Env "TAOS_ADAPTER_POOL_WAIT_TIMEOUT" (default 60)
  -P, --port int                                     http port. Env "TAOS_ADAPTER_PORT" (default 6041)
      --prometheus.enable                            enable prometheus. Env "TAOS_ADAPTER_PROMETHEUS_ENABLE" (default true)
      --restfulRowLimit int                          restful returns the maximum number of rows (-1 means no limit). Env "TAOS_ADAPTER_RESTFUL_ROW_LIMIT" (default -1)
      --smlAutoCreateDB                              Whether to automatically create db when writing with schemaless. Env "TAOS_ADAPTER_SML_AUTO_CREATE_DB"
      --statsd.allowPendingMessages int              statsd allow pending messages. Env "TAOS_ADAPTER_STATSD_ALLOW_PENDING_MESSAGES" (default 50000)
      --statsd.db string                             statsd db name. Env "TAOS_ADAPTER_STATSD_DB" (default "statsd")
      --statsd.deleteCounters                        statsd delete counter cache after gather. Env "TAOS_ADAPTER_STATSD_DELETE_COUNTERS" (default true)
      --statsd.deleteGauges                          statsd delete gauge cache after gather. Env "TAOS_ADAPTER_STATSD_DELETE_GAUGES" (default true)
      --statsd.deleteSets                            statsd delete set cache after gather. Env "TAOS_ADAPTER_STATSD_DELETE_SETS" (default true)
      --statsd.deleteTimings                         statsd delete timing cache after gather. Env "TAOS_ADAPTER_STATSD_DELETE_TIMINGS" (default true)
      --statsd.enable                                enable statsd. Env "TAOS_ADAPTER_STATSD_ENABLE"
      --statsd.gatherInterval duration               statsd gather interval. Env "TAOS_ADAPTER_STATSD_GATHER_INTERVAL" (default 5s)
      --statsd.maxTCPConnections int                 statsd max tcp connections. Env "TAOS_ADAPTER_STATSD_MAX_TCP_CONNECTIONS" (default 250)
      --statsd.password string                       statsd password. Env "TAOS_ADAPTER_STATSD_PASSWORD" (default "taosdata")
      --statsd.port int                              statsd server port. Env "TAOS_ADAPTER_STATSD_PORT" (default 6044)
      --statsd.protocol string                       statsd protocol [tcp or udp]. Env "TAOS_ADAPTER_STATSD_PROTOCOL" (default "udp4")
      --statsd.tcpKeepAlive                          enable tcp keep alive. Env "TAOS_ADAPTER_STATSD_TCP_KEEP_ALIVE"
      --statsd.ttl int                               statsd data ttl. Env "TAOS_ADAPTER_STATSD_TTL"
      --statsd.user string                           statsd user. Env "TAOS_ADAPTER_STATSD_USER" (default "root")
      --statsd.worker int                            statsd write worker. Env "TAOS_ADAPTER_STATSD_WORKER" (default 10)
      --taosConfigDir string                         load taos client config path. Env "TAOS_ADAPTER_TAOS_CONFIG_FILE"
      --uploadKeeper.enable                          Whether to enable sending metrics to keeper. Env "TAOS_ADAPTER_UPLOAD_KEEPER_ENABLE" (default true)
      --uploadKeeper.interval duration               send to Keeper interval. Env "TAOS_ADAPTER_UPLOAD_KEEPER_INTERVAL" (default 15s)
      --uploadKeeper.retryInterval duration          retry interval. Env "TAOS_ADAPTER_UPLOAD_KEEPER_RETRY_INTERVAL" (default 5s)
      --uploadKeeper.retryTimes uint                 retry times. Env "TAOS_ADAPTER_UPLOAD_KEEPER_RETRY_TIMES" (default 3)
      --uploadKeeper.timeout duration                send to Keeper timeout. Env "TAOS_ADAPTER_UPLOAD_KEEPER_TIMEOUT" (default 5s)
      --uploadKeeper.url string                      Keeper url. Env "TAOS_ADAPTER_UPLOAD_KEEPER_URL" (default "http://127.0.0.1:6043/adapter_report")
  -V, --version                                      Print the version and exit

Note: Please set the following Cross-Origin Resource Sharing (CORS) parameters according to the actual situation when using a browser for interface calls.

AllowAllOrigins
AllowOrigins
AllowHeaders
ExposeHeaders
AllowCredentials
AllowWebSockets

You do not need to care about these configurations if you do not make interface calls through the browser.

For details on the CORS protocol, please refer to: https://www.w3.org/wiki/CORS_Enabled or https://developer.mozilla.org/zh-CN/docs/Web/HTTP/CORS.

See example/config/taosadapter.toml for sample configuration files.

Connection Pool Parameters

When using the RESTful interface, TDengine connections are managed through a connection pool. The pool can be configured with the following parameters:

• pool.maxConnect: The maximum number of connections allowed in the pool. The default value is 2 times the number of CPU cores. It is recommended to keep the default setting.
• pool.maxIdle: The maximum number of idle connections allowed in the pool. By default, this is the same as pool.maxConnect. It is recommended to keep the default setting.
• pool.idleTimeout: The idle timeout duration for connections. By default, connections never time out. It is recommended to keep the default setting.
• pool.waitTimeout: The timeout for acquiring a connection from the pool. The default value is 60 seconds. If a connection cannot be acquired within the timeout, an HTTP 503 status code will be returned. This parameter is available starting from version 3.3.3.0.
• pool.maxWait: The maximum number of requests waiting to acquire a connection from the pool. The default value is 0, meaning there is no limit. If the number of queued requests exceeds this value, new requests will return an HTTP 503 status code. This parameter is available starting from version 3.3.3.0.

Feature List

• RESTful interface https://docs.tdengine.com/reference/rest-api/
• Compatible with InfluxDB v1 write interface https://docs.influxdata.com/influxdb/v2.0/reference/api/influxdb-1x/write/
• Compatible with OpenTSDB JSON and telnet format writes
  • http://opentsdb.net/docs/build/html/api_http/put.html
  • http://opentsdb.net/docs/build/html/api_telnet/put.html
• Seamless connection to collectd. collectd is a system statistics collection daemon, please visit https://collectd.org/ for more information.
• Seamless connection with StatsD. StatsD is a simple yet powerful daemon for aggregating statistical information. Please visit https://github.com/statsd/statsd for more information.
• Seamless connection with icinga2. icinga2 is a software that collects inspection result metrics and performance data. Please visit https://icinga.com/docs/icinga-2/latest/doc/14-features/#opentsdb-writer for more information.
• Seamless connection to TCollector. TCollector is a client process that collects data from a local collector and pushes the data to OpenTSDB. Please visit http://opentsdb.net/docs/build/html/user_guide/utilities/tcollector.html for more information.
• Seamless connection to node_exporter. node_export is an exporter for machine metrics. Please visit https://github.com/prometheus/node_exporter for more information.
• Support for Prometheus remote_read and remote_write. remote_read and remote_write are interfaces for Prometheus data read and write from/to other data storage solution. Please visit https://prometheus.io/blog/2019/10/10/remote-read-meets-streaming/#remote-apis for more information.
• Get table's VGroup ID.

Interfaces

TDengine RESTful interface

You can use any client that supports the http protocol to write data to or query data from TDengine by accessing the REST interface address http://<fqdn>:6041/rest/sql. See the official documentation for details.

InfluxDB

You can use any client that supports the http protocol to access the RESTful interface address http://<fqdn>:6041/<APIEndPoint> to write data in InfluxDB compatible format to TDengine. The EndPoint is as follows:

/influxdb/v1/write

Support InfluxDB query parameters as follows.

• db Specifies the database name used by TDengine
• precision The time precision used by TDengine
• u TDengine user name
• p TDengine password
• ttl The time to live of automatically created sub-table. This value cannot be updated. TDengine will use the ttl value of the first data of sub-table to create sub-table. For more information, please refer Create Table

Note: InfluxDB token authorization is not supported at present. Only Basic authorization and query parameter validation are supported. Example: curl --request POST http://127.0.0.1:6041/influxdb/v1/write?db=test --user "root:taosdata" --data-binary "measurement,host=host1 field1=2i,field2=2.0 1577836800000000000"

OpenTSDB

You can use any client that supports the http protocol to access the RESTful interface address http://<fqdn>:6041/<APIEndPoint> to write data in OpenTSDB compatible format to TDengine. The EndPoint is as follows:

/opentsdb/v1/put/json/<db>
/opentsdb/v1/put/telnet/<db>

collectd

Configuring taosAdapter

To configure taosAdapter to receive collectd data.

• Enable the configuration item in the taosAdapter configuration file (default location is /etc/taos/taosadapter.toml)

...
[opentsdb_telnet]
enable = true
maxTCPConnections = 250
tcpKeepAlive = false
dbs = ["opentsdb_telnet", "collectd", "icinga2", "tcollector"]
ports = [6046, 6047, 6048, 6049]
user = "root"
password = "taosdata"
...

The default database name written by taosAdapter is collectd. You can also modify the taosAdapter configuration file dbs entry to specify a different name. user and password are the values configured by the actual TDengine. After changing the configuration file, you need to restart the taosAdapter.

• You can also enable the taosAdapter to receive collectd data by using the taosAdapter command-line parameters or by setting environment variables.

Configure collectd

#collectd collectd uses a plugin mechanism to write the collected monitoring data to different data storage software in various forms. tdengine supports both direct collection plugins and write_tsdb plugins.

Configure the direct collection plugin

Modify the relevant configuration items in the collectd configuration file (default location /etc/collectd/collectd.conf).

LoadPlugin network
<Plugin network>
         Server "<taosAdapter's host>" "<port for collectd direct>"
</Plugin>

where <taosAdapter's host> fills in the server's domain name or IP address running taosAdapter. <port for collectd direct> fills in the port that taosAdapter uses to receive collectd data (default is 6045).

An example is as follows.

LoadPlugin network
<Plugin network
         Server "127.0.0.1" "6045"
</Plugin>

Configure write_tsdb plugin data

Modify the relevant configuration items in the collectd configuration file (default location /etc/collectd/collectd.conf).

LoadPlugin write_tsdb
<Plugin write_tsdb>
        <Node>
                Host "<taosAdapter's host>"
                Port "<port for collectd write_tsdb plugin>"
                ...
        </Node>
</Plugin>

Where <taosAdapter's host> is the domain name or IP address of the server running taosAdapter. <port for collectd write_tsdb plugin> Fill in the data that taosAdapter uses to receive the collectd write_tsdb plugin (default is 6047).

LoadPlugin write_tsdb
<Plugin write_tsdb>
        <Node>
                Host "127.0.0.1"
                Port "6047"
                HostTags "status=production"
                StoreRates false
                AlwaysAppendDS false
        </Node
</Plugin>

Then restart collectd.

systemctl restart collectd

StatsD

Configuring taosAdapter

To configure taosAdapter to receive StatsD data.

• Enable the configuration item in the taosAdapter configuration file (default location /etc/taos/taosadapter.toml)

...
[statsd]
enable = true
port = 6044
db = "statsd"
user = "root"
password = "taosdata"
worker = 10
gatherInterval = "5s"
protocol = "udp"
maxTCPConnections = 250
tcpKeepAlive = false
allowPendingMessages = 50000
deleteCounters = true
deleteGauges = true
deleteSets = true
deleteTimings = true
...

The default database name written by taosAdapter is statsd. To specify a different name, you can also modify the taosAdapter configuration file db entry. user and password fill in the actual TDengine configuration values. After changing the configuration file, you need to restart the taosAdapter.

• You can also enable taosAdapter to receive StatsD data by using the taosAdapter command-line parameters or setting environment variables.

Configuring StatsD

To use StatsD, you need to download its source code. Please refer to the example file exampleConfig.js in the root directory of the source download to modify the configuration file. In <taosAdapter's host>, please fill in the domain name or IP address of the server running taosAdapter, and <port for StatsD>, please fill in the port where taosAdapter receives StatsD data (default is 6044).

backends section add ". /backends/repeater"
Add { host:'<taosAdapter's host>', port: <port for StatsD>} to repeater section

Example configuration file.

{
port: 8125
, backends: [". /backends/repeater"]
, repeater: [{ host: '127.0.0.1', port: 6044}]
}

Start StatsD after adding the following (assuming the config file is modified to config.js)

npm install
node stats.js config.js &

icinga2 OpenTSDB writer

Configuring taosAdapter

To configure taosAdapter to receive icinga2 data.

• Enable the configuration item in the taosAdapter configuration file (default location /etc/taos/taosadapter.toml)

...
[opentsdb_telnet]
enable = true
maxTCPConnections = 250
tcpKeepAlive = false
dbs = ["opentsdb_telnet", "collectd", "icinga2", "tcollector"]
ports = [6046, 6047, 6048, 6049]
user = "root"
password = "taosdata"
...

The default database name written by the taosAdapter is icinga2. You can also modify the taosAdapter configuration file dbs entry to specify a different name. user and password are the values configured by the actual TDengine. You need to restart the taosAdapter after modification.

• You can also enable taosAdapter to receive icinga2 data by using the taosAdapter command-line parameters or setting environment variables.

Configure icinga3

• Enable opentsdb-writer for icinga2 (refer to the link https://icinga.com/docs/icinga-2/latest/doc/14-features/#opentsdb-writer)
• Modify the configuration file /etc/icinga2/features-enabled/opentsdb.conf by filling in <taosAdapter's host> as the domain name or IP address of the server running taosAdapter and <port for icinga2> as the corresponding port on which taosAdapter supports receiving icinga2 data (default is 6048)

object OpenTsdbWriter "opentsdb" {
  host = "<taosAdapter's host>"
  port = <port for icinga2>
}

Example file:

object OpenTsdbWriter "opentsdb" {
  host = "127.0.0.1"
  port = 6048
}

TCollector

Configuring taosAdapter

To configure taosAdapter to receive TCollector data.

• Enable the configuration item in the taosAdapter configuration file (default location /etc/taos/taosadapter.toml)

...
[opentsdb_telnet]
enable = true
maxTCPConnections = 250
tcpKeepAlive = false
dbs = ["opentsdb_telnet", "collectd", "icinga2", "tcollector"]
ports = [6046, 6047, 6048, 6049]
user = "root"
password = "taosdata"
...

The taosAdapter writes to the database with the default name tcollector. You can also modify the taosAdapter configuration file dbs entry to specify a different name. Fill in the actual user and password for TDengine. After changing the configuration file, you need to restart the taosAdapter.

• You can also enable taosAdapter to receive tcollector data by using the taosAdapter command-line parameters or setting environment variables.

Configuring TCollector

To use TCollector, you need to download its source code. Its configuration items are in its source code. Note: TCollector differs significantly from version to version, so here is an example of the latest code for the current master branch (git commit: 37ae920).

Modify the contents of the collectors/etc/config.py and tcollector.py files. Change the address of the OpenTSDB host to the domain name or IP address of the server where taosAdapter is deployed, and change the port to the port on which taosAdapter supports TCollector (default is 6049).

Example of git diff output of source code changes.

index e7e7a1c..ec3e23c 100644
--- a/collectors/etc/config.py
+++ b/collectors/etc/config.py
@@ -59,13 +59,13 @@ def get_defaults():
         'http_password': False,
         'reconnectinterval': 0,
         'http_username': False,
-        'port': 4242,
+        'port': 6049,
         'pidfile': '/var/run/tcollector.pid',
         'http': False,
         'http_api_path': "api/put",
         'tags': [],
         'remove_inactive_collectors': False,
-        'host': '',
+        'host': '127.0.0.1',
         'logfile': '/var/log/tcollector.log',
         'cdir': default_cdir,
         'ssl': False,
diff --git a/tcollector.py b/tcollector.py
index 21f9b23..4c71ba2 100755
--- a/tcollector.py
+++ b/tcollector.py
@@ -64,7 +64,7 @@ ALIVE = True
 # exceptions, something is not right and tcollector will shutdown.
 # Hopefully some kind of supervising daemon will then restart it.
 MAX_UNCAUGHT_EXCEPTIONS = 100
-DEFAULT_PORT = 4242
+DEFAULT_PORT = 6049
 MAX_REASONABLE_TIMESTAMP = 2209212000  # Good until Tue  3 Jan 14:00:00 GMT 2040
 # How long to wait for datapoints before assuming
 # a collector is dead and restarting it
@@ -943,13 +943,13 @@ def parse_cmdline(argv):
             'http_password': False,
             'reconnectinterval': 0,
             'http_username': False,
-            'port': 4242,
+            'port': 6049,
             'pidfile': '/var/run/tcollector.pid',
             'http': False,
             'http_api_path': "api/put",
             'tags': [],
             'remove_inactive_collectors': False,
-            'host': '',
+            'host': '127.0.0.1',
             'logfile': '/var/log/tcollector.log',
             'cdir': default_cdir,
             'ssl': False,

node_exporter

node_export is an exporter of hardware and OS metrics exposed by the *NIX kernel used by Prometheus

• Enable the taosAdapter configuration node_exporter.enable
• Set the configuration of the node_exporter
• Restart taosAdapter

Prometheus

Configuring Prometheus is done by editing the Prometheus configuration file prometheus.yml (default location /etc/prometheus/prometheus.yml).

Configuring third-party database addresses

Point the remote_read url and remote_write url to the domain name or IP address of the server running the taosAdapter service, the REST service port (taosAdapter uses 6041 by default), and the name of the database you want to write to TDengine, and ensure that the corresponding URL form as follows.

• remote_read url : http://<taosAdapter's host>:<REST service port>/prometheus/v1/remote_read/<database name>
• remote_write url : http://<taosAdapter's host>:<REST service port>/prometheus/v1/remote_write/<database name>

Configure Basic authentication

• username: TDengine's username
• password: TDengine's password

Example configuration of remote_write and remote_read related sections in prometheus.yml file

remote_write:
  - url: "http://localhost:6041/prometheus/v1/remote_write/prometheus_data"
    basic_auth:
      username: root
      password: taosdata

remote_read:
  - url: "http://localhost:6041/prometheus/v1/remote_read/prometheus_data"
    basic_auth:
      username: root
      password: taosdata
    remote_timeout: 10s
    read_recent: true

Get table's VGroup ID

You can call http://<fqdn>:6041/rest/vgid?db=<db>&table=<table> to get table's VGroup ID.

Memory usage optimization methods

taosAdapter will monitor its memory usage during operation and adjust it with two thresholds. Valid values are integers between 1 to 100, and represent a percentage of the system's physical memory.

• pauseQueryMemoryThreshold
• pauseAllMemoryThreshold

Stops processing query requests when the pauseQueryMemoryThreshold threshold is exceeded.

HTTP response content.

• code 503
• body "query memory exceeds threshold"

Stops processing all write and query requests when the pauseAllMemoryThreshold threshold is exceeded.

HTTP response content.

• code 503
• body "memory exceeds threshold"

Resume the corresponding function when the memory falls back below the threshold.

Status check interface http://<fqdn>:6041/-/ping

• Normal returns code 200
• No parameter If memory exceeds pauseAllMemoryThreshold returns code 503
• Request parameter action=query returns code 503 if memory exceeds pauseQueryMemoryThreshold or pauseAllMemoryThreshold

Corresponding configuration parameter

  monitor.collectDuration monitoring interval environment variable `TAOS_MONITOR_COLLECT_DURATION` (default value 3s)
  monitor.incgroup whether to run in cgroup (set to true for running in container) environment variable `TAOS_MONITOR_INCGROUP`
  monitor.pauseAllMemoryThreshold memory threshold for no more inserts and queries environment variable `TAOS_MONITOR_PAUSE_ALL_MEMORY_THRESHOLD` (default 80)
  monitor.pauseQueryMemoryThreshold memory threshold for no more queries Environment variable `TAOS_MONITOR_PAUSE_QUERY_MEMORY_THRESHOLD` (default 70)

You should adjust this parameter based on your specific application scenario and operation strategy. We recommend using monitoring software to monitor system memory status. The load balancer can also check the taosAdapter running status through this interface.

taosAdapter Monitoring Metrics

taosAdapter collects HTTP-related metrics, CPU percentage, and memory percentage.

HTTP interface

Provides an interface conforming to OpenMetrics.

http://<fqdn>:6041/metrics

Write to TDengine

taosAdapter supports writing the metrics of HTTP monitoring, CPU percentage, and memory percentage to TDengine.

For configuration parameters

Configuration items	Description	Default values
monitor.collectDuration	CPU and memory collection interval	3s
monitor.identity	The current taosadapter identifier will be used if not set to hostname:port
monitor.incgroup	whether it is running in a cgroup (set to true for running in a container)	false
monitor.writeToTD	Whether to write to TDengine	false
monitor.user	TDengine connection username	root
monitor.password	TDengine connection password	taosdata
monitor.writeInterval	Write to TDengine interval	30s

Limit the number of results returned

taosAdapter controls the number of results returned by the parameter restfulRowLimit, -1 means no limit, default is no limit.

This parameter controls the number of results returned by the following interfaces:

• http://<fqdn>:6041/rest/sql
• http://<fqdn>:6041/prometheus/v1/remote_read/:db

Configure http return code

taosAdapter uses the parameter httpCodeServerError to set whether to return a non-200 http status code http status code other than when the C interface returns an error. When set to true, different http status codes will be returned according to the error code returned by C. For details, see RESTful API HTTP Response Code chapter.

Configure whether schemaless writes automatically create DBs

Starting from version 3.0.4.0, the taosAdapter provides the parameter "smlAutoCreateDB" to control whether to automatically create DBs when writing with the schemaless protocol. The default value is false, which means that the DB will not be automatically created and the user needs to manually create the DB before performing schemaless writing.

Troubleshooting

You can check the taosAdapter running status with the systemctl status taosadapter command.

You can also adjust the level of the taosAdapter log output by setting the --logLevel parameter or the environment variable TAOS_ADAPTER_LOG_LEVEL. Valid values are: panic, fatal, error, warn, warning, info, debug and trace.

How to migrate from older TDengine versions to taosAdapter

In TDengine server 2.2.x.x or earlier, the TDengine server process (taosd) contains an embedded HTTP service. As mentioned earlier, taosAdapter is a standalone software managed using systemd and has its own process ID. There are some configuration parameters and behaviors that are different between the two. See the following table for details.

#	embedded httpd	taosAdapter	comment
1	httpEnableRecordSql	--logLevel=debug
2	httpMaxThreads	n/a	taosAdapter Automatically manages thread pools without this parameter
3	telegrafUseFieldNum	See the taosAdapter telegraf configuration method
4	restfulRowLimit	restfulRowLimit	Embedded httpd outputs 10240 rows of data by default, the maximum allowed is 102400. taosAdapter also provides restfulRowLimit but it is not limited by default. You can configure it according to the actual scenario.
5	httpDebugFlag	Not applicable	httpdDebugFlag does not work for taosAdapter
6	httpDBNameMandatory	N/A	taosAdapter requires the database name to be specified in the URL