Created question in FIWARE Q/A platform on 17-12-2015 at 14:12
Please, ANSWER this question AT https://stackoverflow.com/questions/34335366/why-wont-cygnus-receive-a-subscription-on-my-centos-6-7

Question:
Why wont Cygnus receive a subscription on my CentOS 6.7?

Description:
I just finished testing the entire thing on my virtual machine environment and now I am trying to launch it on the dedicated server. And now I ran into a completely new issue. First I confirmed that I have both context Broker and centos running (on 1026 and 5050 respectively):

[root@centos conf]# netstat -ntlpd
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:1026 0.0.0.0:* LISTEN 1321/contextBroker
tcp 0 0 127.0.0.1:27017 0.0.0.0:* LISTEN 1282/mongod
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 1791/mysqld
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1260/sshd
tcp 0 0 :::1026 :::* LISTEN 1321/contextBroker
tcp 0 0 :::8081 :::* LISTEN 2481/java
tcp 0 0 :::22 :::* LISTEN 1260/sshd
tcp 0 0 :::5050 :::* LISTEN 2481/java
[root@centos conf]# service cygnus status
Cygnus 1 status...
cygnus-flume-ng (pid 2481) is running...

Then I confirmed that I have data on contextBroker because this command gave me an appropriate response:

(curl localhost:1026/v1/queryContext -s -S --header 'Content-Type: application/json' \
-header 'Accept: application/json' -d @ | python -mjson.tool) <<EOF
{
"entities": [

]
}
EOF

Following the workaround to an issue with root user and logging I fixed the log4j.properties and changed the follwing:

flume.log.dir=/var/log/cygnus

I then started cygnus and got the following log:

Starting an ordered shutdown of Cygnus
Stopping sources
Stopping http-source (lyfecycle state=START)
All the channels are empty
Stopping channels
Stopping mysql-channel (lyfecycle state=START)
Stopping sinks
Stopping mysql-sink (lyfecycle state=START)
Info: Sourcing environment configuration script /usr/cygnus/conf/flume-env.sh
Warning: JAVA_HOME is not set!
+ exec /usr/bin/java -Xmx20m -Dflume.log.file=cygnus.log -cp '/usr/cygnus/conf:/usr/cygnus/lib/:/usr/cygnus/plugins.d/cygnus/lib/:/usr/cygnus/plugins.d/cygnus/libext/*' -Djava.library.path= com.telefonica.iot.cygnus.nodes.CygnusApplic$
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/cygnus/lib/slf4j-log4j12-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/cygnus/plugins.d/cygnus/lib/cygnus-0.11.0-jar-with-dependencies.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
17 Dec 2015 13:35:37,684 INFO [main] (com.telefonica.iot.cygnus.nodes.CygnusApplication.main:235) - Starting a Jetty server listening on port 8081 (Management Interface)
17 Dec 2015 13:35:37,700 INFO [main] (org.mortbay.log.Slf4jLog.info:67) - Logging to org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog
17 Dec 2015 13:35:37,700 INFO [main] (com.telefonica.iot.cygnus.nodes.CygnusApplication.main:238) - Starting Cygnus application
17 Dec 2015 13:35:37,700 INFO [Thread-1] (org.mortbay.log.Slf4jLog.info:67) - jetty-6.1.26
17 Dec 2015 13:35:37,713 INFO [lifecycleSupervisor-1-0] (org.apache.flume.node.PollingPropertiesFileConfigurationProvider.start:61) - Configuration provider starting
17 Dec 2015 13:35:37,715 INFO [conf-file-poller-0] (org.apache.flume.node.PollingPropertiesFileConfigurationProvider$FileWatcherRunnable.run:133) - Reloading configuration file:/usr/cygnus/conf/agent_1.conf
17 Dec 2015 13:35:37,725 INFO [conf-file-poller-0] (org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.addProperty:1016) - Processing:mysql-sink
17 Dec 2015 13:35:37,725 INFO [conf-file-poller-0] (org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.addProperty:1016) - Processing:mysql-sink
17 Dec 2015 13:35:37,725 INFO [conf-file-poller-0] (org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.addProperty:1016) - Processing:mysql-sink
17 Dec 2015 13:35:37,755 INFO [Thread-1] (org.mortbay.log.Slf4jLog.info:67) - Started SocketConnector@0.0.0.0:8081
17 Dec 2015 13:35:37,764 WARN [conf-file-poller-0] (org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.isValid:319) - Agent configuration for 'cygunsagent' does not contain any channels. Marking it as invalid.
17 Dec 2015 13:35:37,765 WARN [conf-file-poller-0] (org.apache.flume.conf.FlumeConfiguration.validateConfiguration:127) - Agent configuration invalid for agent 'cygunsagent'. It will be removed.
17 Dec 2015 13:35:37,766 INFO [conf-file-poller-0] (org.apache.flume.conf.FlumeConfiguration.validateConfiguration:140) - Post-validation flume configuration contains configuration for agents: [cygnusagent]
17 Dec 2015 13:35:37,766 INFO [conf-file-poller-0] (org.apache.flume.node.AbstractConfigurationProvider.loadChannels:150) - Creating channels
17 Dec 2015 13:35:37,778 INFO [conf-file-poller-0] (org.apache.flume.channel.DefaultChannelFactory.create:40) - Creating instance of channel mysql-channel type memory
17 Dec 2015 13:35:37,782 INFO [conf-file-poller-0] (org.apache.flume.node.AbstractConfigurationProvider.loadChannels:205) - Created channel mysql-channel
17 Dec 2015 13:35:37,783 INFO [conf-file-poller-0] (org.apache.flume.source.DefaultSourceFactory.create:39) - Creating instance of source http-source, type org.apache.flume.source.http.HTTPSource
17 Dec 2015 13:35:37,791 INFO [conf-file-poller-0] (com.telefonica.iot.cygnus.handlers.OrionRestHandler.<init>:75) - Cygnus version (0.11.0.2a9c87fb7fd6156225e2eed7fbc9792f1d9c5dfe)
17 Dec 2015 13:35:37,807 INFO [conf-file-poller-0] (com.telefonica.iot.cygnus.handlers.OrionRestHandler.configure:141) - Startup completed
17 Dec 2015 13:35:37,826 INFO [conf-file-poller-0] (org.apache.flume.sink.DefaultSinkFactory.create:40) - Creating instance of sink: mysql-sink, type: com.telefonica.iot.cygnus.sinks.OrionMySQLSink
17 Dec 2015 13:35:37,839 INFO [conf-file-poller-0] (org.apache.flume.node.AbstractConfigurationProvider.getConfiguration:119) - Channel mysql-channel connected to [http-source, mysql-sink]
17 Dec 2015 13:35:37,843 INFO [conf-file-poller-0] (org.apache.flume.node.Application.startAllComponents:138) - Starting new configuration:{ sourceRunners:{http-source=EventDrivenSourceRunner: { source:org.apache.flume.source.http.HTT$
17 Dec 2015 13:35:37,844 INFO [conf-file-poller-0] (org.apache.flume.node.Application.startAllComponents:145) - Starting Channel mysql-channel
17 Dec 2015 13:35:37,910 INFO [lifecycleSupervisor-1-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.register:110) - Monitoried counter group for type: CHANNEL, name: mysql-channel, registered successfully.
17 Dec 2015 13:35:37,910 INFO [lifecycleSupervisor-1-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.start:94) - Component type: CHANNEL, name: mysql-channel started
17 Dec 2015 13:35:37,911 INFO [conf-file-poller-0] (org.apache.flume.node.Application.startAllComponents:173) - Starting Sink mysql-sink
17 Dec 2015 13:35:37,913 INFO [lifecycleSupervisor-1-1] (com.telefonica.iot.cygnus.sinks.OrionMySQLSink.start:153) - [mysql-sink] Startup completed
17 Dec 2015 13:35:37,915 INFO [conf-file-poller-0] (org.apache.flume.node.Application.startAllComponents:184) - Starting Source http-source
17 Dec 2015 13:35:37,916 INFO [lifecycleSupervisor-1-2] (com.telefonica.iot.cygnus.interceptors.GroupingInterceptor.initialize:92) - Grouping rules read:
17 Dec 2015 13:35:37,916 INFO [conf-file-poller-0] (org.apache.flume.node.Application.stopAllComponents:101) - Shutting down configuration: { sourceRunners:{http-source=EventDrivenSourceRunner: { source:org.apache.flume.source.http.HT$
17 Dec 2015 13:35:37,917 INFO [conf-file-poller-0] (org.apache.flume.node.Application.stopAllComponents:105) - Stopping Source http-source
17 Dec 2015 13:35:37,920 ERROR [lifecycleSupervisor-1-2] (com.telefonica.iot.cygnus.interceptors.GroupingInterceptor.parseGroupingRules:165) - Error while parsing the Json-based grouping rules file. Details=null
17 Dec 2015 13:35:37,921 WARN [lifecycleSupervisor-1-2] (com.telefonica.iot.cygnus.interceptors.GroupingInterceptor.initialize:98) - Grouping rules syntax has errors
17 Dec 2015 13:35:37,948 INFO [lifecycleSupervisor-1-2] (org.mortbay.log.Slf4jLog.info:67) - jetty-6.1.26
17 Dec 2015 13:35:37,973 INFO [lifecycleSupervisor-1-2] (org.mortbay.log.Slf4jLog.info:67) - Started SocketConnector@0.0.0.0:5050
17 Dec 2015 13:35:37,974 INFO [lifecycleSupervisor-1-2] (org.apache.flume.instrumentation.MonitoredCounterGroup.register:110) - Monitoried counter group for type: SOURCE, name: http-source, registered successfully.
17 Dec 2015 13:35:37,974 INFO [lifecycleSupervisor-1-2] (org.apache.flume.instrumentation.MonitoredCounterGroup.start:94) - Component type: SOURCE, name: http-source started
17 Dec 2015 13:35:37,974 INFO [conf-file-poller-0] (org.apache.flume.lifecycle.LifecycleSupervisor.unsupervise:171) - Stopping component: EventDrivenSourceRunner: { source:org.apache.flume.source.http.HTTPSource{name:http-source,state$
17 Dec 2015 13:35:37,974 INFO [conf-file-poller-0] (org.mortbay.log.Slf4jLog.info:67) - Stopped SocketConnector@0.0.0.0:5050
17 Dec 2015 13:35:37,975 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:139) - Component type: SOURCE, name: http-source stopped
17 Dec 2015 13:35:37,976 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:145) - Shutdown Metric for type: SOURCE, name: http-source. source.start.time == 1450355737974
17 Dec 2015 13:35:37,976 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:151) - Shutdown Metric for type: SOURCE, name: http-source. source.stop.time == 1450355737975
17 Dec 2015 13:35:37,976 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:167) - Shutdown Metric for type: SOURCE, name: http-source. src.append-batch.accepted == 0
17 Dec 2015 13:35:37,976 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:167) - Shutdown Metric for type: SOURCE, name: http-source. src.append-batch.received == 0
17 Dec 2015 13:35:37,976 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:167) - Shutdown Metric for type: SOURCE, name: http-source. src.append.accepted == 0
17 Dec 2015 13:35:37,976 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:167) - Shutdown Metric for type: SOURCE, name: http-source. src.append.received == 0
17 Dec 2015 13:35:37,977 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:167) - Shutdown Metric for type: SOURCE, name: http-source. src.events.accepted == 0
17 Dec 2015 13:35:37,977 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:167) - Shutdown Metric for type: SOURCE, name: http-source. src.events.received == 0
17 Dec 2015 13:35:37,977 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:167) - Shutdown Metric for type: SOURCE, name: http-source. src.open-connection.count == 0
17 Dec 2015 13:35:37,977 INFO [conf-file-poller-0] (org.apache.flume.source.http.HTTPSource.stop:172) - Http source http-source stopped. Metrics: SOURCE:http-source{src.events.accepted=0, src.open-connection.count=0, src.append.receiv$
17 Dec 2015 13:35:37,977 INFO [conf-file-poller-0] (org.apache.flume.node.Application.stopAllComponents:115) - Stopping Sink mysql-sink
17 Dec 2015 13:35:37,977 INFO [conf-file-poller-0] (org.apache.flume.lifecycle.LifecycleSupervisor.unsupervise:171) - Stopping component: SinkRunner: { policy:org.apache.flume.sink.DefaultSinkProcessor@76da521f counterGroup:{ name:nul$
17 Dec 2015 13:35:37,987 INFO [conf-file-poller-0] (org.apache.flume.node.Application.stopAllComponents:125) - Stopping Channel mysql-channel
17 Dec 2015 13:35:37,987 INFO [conf-file-poller-0] (org.apache.flume.lifecycle.LifecycleSupervisor.unsupervise:171) - Stopping component: org.apache.flume.channel.MemoryChannel

17 Dec 2015 13:35:37,987 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:139) - Component type: CHANNEL, name: mysql-channel stopped
17 Dec 2015 13:35:37,987 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:145) - Shutdown Metric for type: CHANNEL, name: mysql-channel. channel.start.time == 1450355737910
17 Dec 2015 13:35:37,988 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:151) - Shutdown Metric for type: CHANNEL, name: mysql-channel. channel.stop.time == 1450355737987
17 Dec 2015 13:35:37,988 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:167) - Shutdown Metric for type: CHANNEL, name: mysql-channel. channel.capacity == 1000
17 Dec 2015 13:35:37,988 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:167) - Shutdown Metric for type: CHANNEL, name: mysql-channel. channel.current.size == 0
17 Dec 2015 13:35:37,988 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:167) - Shutdown Metric for type: CHANNEL, name: mysql-channel. channel.event.put.attempt == 0
17 Dec 2015 13:35:37,988 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:167) - Shutdown Metric for type: CHANNEL, name: mysql-channel. channel.event.put.success == 0
17 Dec 2015 13:35:37,988 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:167) - Shutdown Metric for type: CHANNEL, name: mysql-channel. channel.event.take.attempt == 1
17 Dec 2015 13:35:37,989 INFO [conf-file-poller-0] (org.apache.flume.instrumentation.MonitoredCounterGroup.stop:167) - Shutdown Metric for type: CHANNEL, name: mysql-channel. channel.event.take.success == 0
17 Dec 2015 13:35:37,989 INFO [conf-file-poller-0] (org.apache.flume.node.Application.startAllComponents:138) - Starting new configuration:{ sourceRunners:{http-source=EventDrivenSourceRunner: { source:org.apache.flume.source.http.HTT$
17 Dec 2015 13:35:37,989 INFO [conf-file-poller-0] (org.apache.flume.node.Application.startAllComponents:145) - Starting Channel mysql-channel
17 Dec 2015 13:35:37,989 INFO [lifecycleSupervisor-1-3] (org.apache.flume.instrumentation.MonitoredCounterGroup.start:94) - Component type: CHANNEL, name: mysql-channel started
17 Dec 2015 13:35:37,992 INFO [conf-file-poller-0] (org.apache.flume.node.Application.startAllComponents:173) - Starting Sink mysql-sink
17 Dec 2015 13:35:37,993 INFO [lifecycleSupervisor-1-8] (com.telefonica.iot.cygnus.sinks.OrionMySQLSink.start:153) - [mysql-sink] Startup completed
17 Dec 2015 13:35:37,993 INFO [conf-file-poller-0] (org.apache.flume.node.Application.startAllComponents:184) - Starting Source http-source
17 Dec 2015 13:35:37,993 INFO [lifecycleSupervisor-1-4] (com.telefonica.iot.cygnus.interceptors.GroupingInterceptor.initialize:92) - Grouping rules read:
17 Dec 2015 13:35:37,994 ERROR [lifecycleSupervisor-1-4] (com.telefonica.iot.cygnus.interceptors.GroupingInterceptor.parseGroupingRules:165) - Error while parsing the Json-based grouping rules file. Details=null
17 Dec 2015 13:35:37,994 WARN [lifecycleSupervisor-1-4] (com.telefonica.iot.cygnus.interceptors.GroupingInterceptor.initialize:98) - Grouping rules syntax has errors
17 Dec 2015 13:35:37,994 INFO [lifecycleSupervisor-1-4] (org.mortbay.log.Slf4jLog.info:67) - jetty-6.1.26
17 Dec 2015 13:35:37,996 INFO [lifecycleSupervisor-1-4] (org.mortbay.log.Slf4jLog.info:67) - Started SocketConnector@0.0.0.0:5050
17 Dec 2015 13:35:37,996 INFO [lifecycleSupervisor-1-4] (org.apache.flume.instrumentation.MonitoredCounterGroup.start:94) - Component type: SOURCE, name: http-source started

Then I tried to subscribe the previously mentioned data to cygnus:

(curl localhost:1026/v1/subscribeContext -s -S --header 'Content-Type: application/json' \
-header 'Accept: application/json' -d @ | python -mjson.tool) <<EOF
{
"entities": [

],
"attributes": [
"pressure"
"temperature"
],
"reference": "http://localhost:5050/notify",
"duration": "P1M",
"notifyConditions": [

],
"throttling": "PT1S"
}
EOF

Even after I updated the information on context Broker thinking it would trigger an event:

(curl localhost:1026/v1/updateContext -s -S --header 'Content-Type: application/json' \
-header 'Accept: application/json' -d @ | python -mjson.tool) <<EOF
{
"contextElements": [
{
"type": "Room",
"isPattern": "false",
"id": "Room1",
"attributes": [

,

]
}
],
"updateAction": "APPEND"
}
EOF

But the cygnus log remainged exactly the same and its like nothing even got through to it. Which is odd considering my agent_1.conf:

1. Copyright 2014 Telefónica Investigación y Desarrollo, S.A.U
   #
2. This file is part of fiware-cygnus (FI-WARE project).
   #
3. fiware-cygnus is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
4. Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
5. later version.
6. fiware-cygnus is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
7. warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
8. details.
   #
9. You should have received a copy of the GNU Affero General Public License along with fiware-cygnus. If not, see
10. http://www.gnu.org/licenses/.
    #
11. For those usages not covered by the GNU Affero General Public License please contact with iot_support at tid dot es

#=============================================

1. To be put in APACHE_FLUME_HOME/conf/agent.conf
   #
2. General configuration template explaining how to setup a sink of each of the available types (HDFS, CKAN, MySQL).

#=============================================

1. The next tree fields set the sources, sinks and channels used by Cygnus. You could use different names than the
2. ones suggested below, but in that case make sure you keep coherence in properties names along the configuration file.
3. Regarding sinks, you can use multiple types at the same time; the only requirement is to provide a channel for each
4. one of them (this example shows how to configure 3 sink types at the same time). Even, you can define more than one
5. sink of the same type and sharing the channel in order to improve the performance (this is like having
6. multi-threading).
   cygnusagent.sources = http-source
   cygnusagent.sinks = mysql-sink
   cygnusagent.channels = mysql-channel

#=============================================

1. source configuration
2. channel name where to write the notification events
   cygnusagent.sources.http-source.channels = mysql-channel
3. source class, must not be changed
   cygnusagent.sources.http-source.type = org.apache.flume.source.http.HTTPSource
4. listening port the Flume source will use for receiving incoming notifications
   cygnusagent.sources.http-source.port = 5050
5. Flume handler that will parse the notifications, must not be changed
   cygnusagent.sources.http-source.handler = com.telefonica.iot.cygnus.handlers.OrionRestHandler
6. URL target
   cygnusagent.sources.http-source.handler.notification_target = /notify
7. Default service (service semantic depends on the persistence sink)
   cygnusagent.sources.http-source.handler.default_service = Trace_Data
8. Default service path (service path semantic depends on the persistence sink)
   cygnusagent.sources.http-source.handler.default_service_path = Sensor
9. Number of channel re-injection retries before a Flume event is definitely discarded (-1 means infinite retries)
   cygnusagent.sources.http-source.handler.events_ttl = 10
10. Source interceptors, do not change
    cygnusagent.sources.http-source.interceptors = ts gi
11. TimestampInterceptor, do not change
    cygnusagent.sources.http-source.interceptors.ts.type = timestamp
12. GroupinInterceptor, do not change
    cygnusagent.sources.http-source.interceptors.gi.type = com.telefonica.iot.cygnus.interceptors.GroupingInterceptor$Builder
13. Grouping rules for the GroupingInterceptor, put the right absolute path to the file if necessary
14. See the doc/design/interceptors document for more details
    cygnusagent.sources.http-source.interceptors.gi.grouping_rules_conf_file = /usr/cygnus/conf/grouping_rules.conf

1. ============================================
2. OrionMySQLSink configuration
3. channel name from where to read notification events
   cygnusagent.sinks.mysql-sink.channel = mysql-channel
4. sink class, must not be changed
   cygnusagent.sinks.mysql-sink.type = com.telefonica.iot.cygnus.sinks.OrionMySQLSink
   # true if the grouping feature is enabled for this sink, false otherwise
   cygnusagent.sinks.mysql-sink.enable_grouping = false
5. the FQDN/IP address where the MySQL server runs
   cygnusagent.sinks.mysql-sink.mysql_host = 127.0.0.1
6. the port where the MySQL server listes for incomming connections
   cygnusagent.sinks.mysql-sink.mysql_port = 3306
7. a valid user in the MySQL server
   cygnusagent.sinks.mysql-sink.mysql_username = root
8. password for the user above
   cygnusagent.sinks.mysql-sink.mysql_password = klasika
9. how the attributes are stored, either per row either per column (row, column)
   cygnusagent.sinks.mysql-sink.attr_persistence = column
10. select the table type from table-by-destination and table-by-service-path
    cygnusagent.sinks.mysql-sink.table_type = table-by-destination
    # number of notifications to be included within a processing batch
    cygnusagent.sinks.mysql-sink.batch_size = 1
11. timeout for batch accumulation
    cygunsagent.sinks.mysql-sink.batch_timeout = 30

#=============================================

1. mysql-channel configuration
2. channel type (must not be changed)
   cygnusagent.channels.mysql-channel.type = memory
3. capacity of the channel
   cygnusagent.channels.mysql-channel.capacity = 1000
4. amount of bytes that can be sent per transaction
   cygnusagent.channels.mysql-channel.transactionCapacity = 100

#============================================

It has 5050 and notify as the reference address. I double checked the cygnus_instance_1.conf as well and it is pointing at agent_1.conf

#####
#

1. Configuration file for apache-flume
   #
   #####
2. Copyright 2014 Telefonica Investigación y Desarrollo, S.A.U
   #
3. This file is part of fiware-cygnus (FI-WARE project).
   #
4. fiware-cygnus is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
5. Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
6. later version.
7. fiware-cygnus is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
8. warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
9. details.
   #
10. You should have received a copy of the GNU Affero General Public License along with fiware-cygnus. If not, see
11. http://www.gnu.org/licenses/.
    #
12. For those usages not covered by the GNU Affero General Public License please contact with iot_support at tid dot es

1. Who to run cygnus as. Note that you may need to use root if you want
2. to run cygnus in a privileged port (<1024)
   CYGNUS_USER=cygnus

1. Where is the config folder
   CONFIG_FOLDER=/usr/cygnus/conf

1. Which is the config file
   CONFIG_FILE=/usr/cygnus/conf/agent_1.conf

1. Name of the agent. The name of the agent is not trivial, since it is the base for the Flume parameters
2. naming conventions, e.g. it appears in .sources.http-source.channels=...
   AGENT_NAME=cygnusagent

1. Name of the logfile located at /var/log/cygnus. It is important to put the extension '.log' in order to the log rotation works properly
   LOGFILE_NAME=cygnus.log

1. Administration port. Must be unique per instance
   ADMIN_PORT=8081

1. Polling interval (seconds) for the configuration reloading
   POLLING_INTERVAL=30

This is the content of my config folder in /usr/cygnus/conf:

[root@centos conf]# ls
agent_1.conf cygnus_instance_1.conf flume-env.sh grouping_rules.conf krb5.conf krb5_login.conf log4j.properties.template
agent.conf.template cygnus_instance.conf.template flume-env.sh.template grouping_rules.conf.template krb5.conf.template log4j.properties README.md

I noticed that there is an exacted mirror of this in /etc/cygnus/conf but I didn't touch anything because the installation only intructs me to use the /usr/ folder.

Here is my Mysql create statement. In this table I am expecting to receive the context broker data but I get nothing of course since the log didnt register anything.

CREATE TABLE sensor_room1_room (
sensorID INT NOT NULL AUTO_INCREMENT,
recvTime mediumtext,
fiwareservicepath text,
entityId text,
entityType text,
pressure text,
pressure_md text,
temperature text,
temperature_md text,
PRIMARY KEY (sensorID));

Edit 1:

Here is the listener

[root@centos conf]# nc -l 5050

But when I tried subscribing or updating context, nothing was received on the listener side. I am not taking into account the client side of nc: nc 127.0.0.1 5050 because it successfully sends everything i type (even gibberish).

I also tried the test: /usr/cygnus/bin/cygnus-flume-ng agent --conf /usr/cygnus/conf/ -f /usr/cygnus/conf/agent_1.conf -n cygnusagent -Dflume.root.logger=DEBUG,console. I tried both 5050 and 8081 ports to subscribe to and then update context but nothing is read on the console.