cygnus-ngsi-ld agent configuration
cygnus-ngsi-ld, as any other Cygnus agent, follows the multi-instance configuration of cygnus-common.
The file agent_<id>.conf can be instantiated from a template given in the Cygnus repository, conf/agent_ngsi.conf.template.
```Java
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To be put in APACHE_FLUME_HOME/conf/cygnus.conf
General configuration template explaining how to setup a sink of each of the available types (HDFS, CKAN, MySQL, PostgreSQL, Mongo, STH Comet, Kafka, DynamoDB, CartoDB).
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The next tree fields set the sources, sinks and channels used by Cygnus. You could use different names than the
ones suggested below, but in that case make sure you keep coherence in properties names along the configuration file.
Regarding sinks, you can use multiple types at the same time; the only requirement is to provide a channel for each
one of them (this example shows how to configure 3 sink types at the same time). Even, you can define more than one
sink of the same type and sharing the channel in order to improve the performance (this is like having
multi-threading).
cygnus-ngsi-ld.sources = http-source cygnus-ngsi-ld.sinks = postgresql-sink cygnus-ngsi-ld.channels = postgresql-channel
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source configuration
channel name where to write the notification events
cygnus-ngsi-ld.sources.http-source.channels = postgresql-channel
source class, must not be changed
cygnus-ngsi-ld.sources.http-source.type = org.apache.flume.source.http.HTTPSource
listening port the Flume source will use for receiving incoming notifications
cygnus-ngsi-ld.sources.http-source.port = 5050
Flume handler that will parse the notifications, must not be changed
cygnus-ngsi-ld.sources.http-source.handler = com.telefonica.iot.cygnus.handlers.NGSIRestHandler
URL target
cygnus-ngsi-ld.sources.http-source.handler.notification_target = /notify
default service (service semantic depends on the persistence sink)
cygnus-ngsi-ld.sources.http-source.handler.default_service = default
default service path (service path semantic depends on the persistence sink)
cygnus-ngsi-ld.sources.http-source.handler.default_service_path = /
source interceptors, do not change
cygnus-ngsi-ld.sources.http-source.interceptors = ts gi
TimestampInterceptor, do not change
cygnus-ngsi-ld.sources.http-source.interceptors.ts.type = timestamp
GroupingInterceptor, do not change
cygnus-ngsi-ld.sources.http-source.interceptors.gi.type = com.telefonica.iot.cygnus.interceptors.NGSIGroupingInterceptor$Builder
Grouping rules for the GroupingIntercetor, put the right absolute path to the file if necessary
see the doc/design/interceptors document for more details
cygnus-ngsi-ld.sources.http-source.interceptors.gi.grouping_rules_conf_file = /usr/cygnus/conf/grouping_rules.conf
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NGSIPostgreSQLSink configuration
channel name from where to read notification events
cygnus-ngsi-ld.sinks.postgresql-sink.channel = postgresql-channel
sink class, must not be changed
cygnus-ngsi-ld.sinks.postgresql-sink.type = com.telefonica.iot.cygnus.sinks.NGSIPostgreSQLSink
true applies the new encoding, false applies the old encoding.
cygnus-ngsi-ld.sinks.postgresql-sink.enable_encoding = false
true if the grouping feature is enabled for this sink, false otherwise
cygnus-ngsi-ld.sinks.postgresql-sink.enable_grouping = false
true if name mappings are enabled for this sink, false otherwise
cygnus-ngsi-ld.sinks.postgresql-sink.enable_name_mappings = false
true if lower case is wanted to forced in all the element names, false otherwise
cygnus-ngsi-ld.sinks.postgresql-sink.enable_lowercase = false
the FQDN/IP address where the PostgreSQL server runs
cygnus-ngsi-ld.sinks.postgresql-sink.postgresql_host = x.y.z.w
the port where the PostgreSQL server listens for incomming connections
cygnus-ngsi-ld.sinks.postgresql-sink.postgresql_port = 5432
the name of the postgresql database
cygnus-ngsi-ld.sinks.postgresql-sink.postgresql_database = postgres
a valid user in the PostgreSQL server
cygnus-ngsi-ld.sinks.postgresql-sink.postgresql_username = root
password for the user above
cygnus-ngsi-ld.sinks.postgresql-sink.postgresql_password = xxxxxxxxxxxxx
how the attributes are stored, either per row either per column (row, column)
cygnus-ngsi-ld.sinks.postgresql-sink.postgresql_database = postgres
the database name of PostgreSQL
cygnus-ngsi-ld.sinks.postgresql-sink.attr_persistence = column
select the data_model: dm-by-service-path, dm-by-entity or dm-by-entity-type
cygnus-ngsi-ld.sinks.postgresql-sink.data_model = by-service-path
number of notifications to be included within a processing batch
cygnus-ngsi-ld.sinks.postgresql-sink.batch_size = 100
timeout for batch accumulation
cygnus-ngsi-ld.sinks.postgresql-sink.batch_timeout = 30
number of retries upon persistence error
cygnus-ngsi-ld.sinks.postgresql-sink.batch_ttl = 10
true enables cache, false disables cache
cygnus-ngsi-ld.sinks.postgresql-sink.backend.enable_cache = false
cygnus-ngsi-ld.sinks.postgresql-sink.postgresql_options = sslmode=require
the jdbc optional parameters string which concatinates to jdbc url
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postgresql-channel configuration
channel type (must not be changed)
cygnus-ngsi-ld.channels.postgresql-channel.type = memory
capacity of the channel
cygnus-ngsi-ld.channels.postgresql-channel.capacity = 1000
amount of bytes that can be sent per transaction
cygnus-ngsi-ld.channels.postgresql-channel.transactionCapacity = 100