Monitor kafka with Prometheus and Grafana - apache-kafka

Question

I have followed the below steps to monitor kafka with Prometheus and Grafana.
jmx port not get opened
wget http://ftp.heanet.ie/mirrors/www.apache.org/dist/kafka/0.10.1.0/kafka_2.11-0.10.1.0.tgz
tar -xzf kafka_*.tgz
cd kafka_*
wget https://repo1.maven.org/maven2/io/prometheus/jmx/jmx_prometheus_javaagent/0.6/jmx_prometheus_javaagent-0.6.jar
wget https://raw.githubusercontent.com/prometheus/jmx_exporter/master/example_configs/kafka-0-8-2.yml
./bin/zookeeper-server-start.sh config/zookeeper.properties &
KAFKA_OPTS="$KAFKA_OPTS -javaagent:$PWD/jmx_prometheus_javaagent-0.6.jar=7071:$PWD/kafka-0-8-2.yml"
./bin/kafka-server-start.sh config/server.properties &
Then i have the checked with curl http://localhost:7071/metrics in the terminal
it reports curl: (7) Failed connect to localhost:7071; Connection refused
Currently i have opened all my ports to my network in the server.
while i m checking with netstat -tupln | grep LISTEN
port number 7071 was not listed in the output
The below is the kafka directory's contents:
drwxr-xr-x. 3 root root 4096 Aug 23 12:22 bin
drwxr-xr-x. 2 root root 4096 Oct 15 2016 config
-rw-r--r--. 1 root root 20356 Aug 21 10:50 hs_err_pid1496.log
-rw-r--r--. 1 root root 19432 Aug 21 10:55 hs_err_pid2447.log
-rw-r--r--. 1 root root 1225418 Feb 5 2016 jmx_prometheus_javaagent-0.6.jar
-rw-r--r--. 1 root root 2824 Aug 21 10:48 kafka-0-8-2.yml
drwxr-xr-x. 2 root root 4096 Aug 21 10:48 libs
-rw-r--r--. 1 root root 28824 Oct 5 2016 LICENSE
drwxr-xr-x. 2 root root 4096 Oct 11 15:05 logs
-rw-------. 1 root root 8453 Aug 23 12:08 nohup.out
-rw-r--r--. 1 root root 336 Oct 5 2016 NOTICE
drwxr-xr-x. 2 root root 46 Oct 15 2016 site-docs
kafka is running in 2181 port and zookeeper is also running

Answer 1

If you do not mind opening up the jmx port, you can also do it like this:
export JMX_PORT=9999
export KAFKA_JMX_OPTS=-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.rmi.port=9999'
./bin/kafka-server-start.sh config/server.properties &
java -jar jmx_prometheus_httpserver-0.10-jar-with-dependencies.jar 9300 kafka-0-8-2.yaml &
The jar-with-dependencies you build from the source with mvn package.

Answer 2

I had the same problem when setting KAFKA_OPTS environment variable in the bash. The worse situation is when you add the environment variable to ~/.profile file. The problem with this approach is that the KAFKA_OPTS is used for both kafka-server-start.sh and zookeeper-server-start.sh so when you start Zookeeper, port 7071 will be used by Zookeeper for exporting metrics. Then, when you run Kafka you will receive the "7071 port is in use error".
I solved the problem by setting the environment at systemd service file. I described it at my article last week:
[Unit]
...
[Service]
...
Restart=no
Environment=KAFKA_OPTS=-javaagent:/home/morteza/myworks/jmx_prometheus_javaagent-0.9.jar=7071:/home/morteza/myworks/kafka-2_0_0.yml
[Install]
...