Basic configurations

The configuration file for eKuiper is at $kuiper/etc/kuiper.yaml. The configuration file is yaml format. Application can be configured through environment variables. Environment variables are taking precedence over their counterparts in the yaml file. In order to use env variable for given config we must use formatting as follows: KUIPER__ prefix + config path elements connected by __. Example, in case of config:

basic:
  # true|false, with debug level, it prints more debug info
  debug: false
  # true|false, if it's set to true, then the log will be print to console
  consoleLog: false
  # true|false, if it's set to true, then the log will be print to log file
  fileLog: true
  # How many hours to split the file
  rotateTime: 24
  # Maximum file storage hours
  maxAge: 72
  # Whether to ignore case in SQL processing. Note that, the name of customized function by plugins are case-sensitive.
  ignoreCase: true

for debug option in basic following env is valid KUIPER__BASIC__DEBUG=true and if used debug value will be set to true.

Configuration ignoreCase is used to ignore case in SQL processing. By default, it's set to true to comply with standard SQL. In this case, data ingested can be case-insensitive. If the column names in the SQL, stream definition and the ingested data can be unified as a case-sensitive name, it is recommended to set to false to gain a better performance.

Log level

basic:
  # true|false, with debug level, it prints more debug info
  debug: false
  # true|false, if it's set to true, then the log will be print to console
  consoleLog: false
  # true|false, if it's set to true, then the log will be print to log file
  fileLog: true
  # How many hours to split the file
  rotateTime: 24
  # Maximum file storage hours
  maxAge: 72

system log

When the user sets the value of the environment variable named KuiperSyslogKey to true, the log will be printed to the syslog.

Cli Addr

basic:
  # CLI bind IP
  ip: 0.0.0.0
  # CLI port
  port: 20498

Rest Service Configuration

basic:
  # REST service bind IP
  restIp: 0.0.0.0
  # REST service port
  restPort: 9081
  restTls:
    certfile: /var/https-server.crt
    keyfile: /var/https-server.key

restPort

The port for the rest api http server to listen to.

restTls

The tls cert file path and key file path setting. If restTls is not set, the rest api server will listen on http. Otherwise, it will listen on https.

authentication

eKuiper will check the Token for rest api when authentication option is true. please check this file for more info.

basic:
  authentication: false

Prometheus Configuration

eKuiper can export metrics to prometheus if prometheus option is true. The prometheus will be served with the port specified by prometheusPort option.

basic:
  prometheus: true
  prometheusPort: 20499

For such a default configuration, eKuiper will export metrics and serve prometheus at http://localhost:20499/metrics.

The prometheus port can be the same as the eKuiper REST API port. If so, both service will be served on the same server.

Pluginhosts Configuration

The URL where hosts all of pre-build native plugins. By default, it's at packages.emqx.net.

All plugins list as follows:

plugin types	pre-build plugins
source	random zmq
sink	file image influx redis tdengine zmq
function	accumulateWordCount countPlusOne echo geohash image labelImage

User can get all pre-build plugins names and address by below Rest-APIs:

GET http://localhost:9081/plugins/sources/prebuild
GET http://localhost:9081/plugins/sinks/prebuild
GET http://localhost:9081/plugins/functions/prebuild

After get the plugin info, users can try these plugins, more info

Note: only the official released debian based docker images support these operations

Rule configurations

Configure the default properties of the rule option. All the configuration can be overridden in rule level. Check rule options for detail.

Sink configurations

Configure the default properties of sink, currently mainly used to configure cache policy. The same configuration options are available at the rules level to override these default configurations.

  sink:
  # Control to disable cache or not. If it's set to true, then the cache will be disabled, otherwise, it will be enabled.
  enableCache: false

  # The maximum number of messages to be cached in memory.
  memoryCacheThreshold: 1024

  # The maximum number of messages to be cached in the disk.
  maxDiskCache: 1024000

  # The number of messages for a buffer page which is the unit to read/write to disk batchly to prevent frequent IO
  bufferPageSize: 256

  # The interval in millisecond to resend the cached messages
  resendInterval: 0

  # Whether to clean the cache when the rule stops
  cleanCacheAtStop: false

Store configurations

There is possibility to configure storage of state for application. Default storage layer is sqlite database. There is option to set redis as storage. In order to use redis as store type property must be changed into redis value.

Sqlite

It has properties

name - name of database file - if left empty it will be sqliteKV.db

Redis