Monitoring Elassandra with Prometheus using Docker - docker

Question

I'm trying to run jmx-exporter container with special configuration following this instruction.
I did all the instructions step-by-step. Here is my docker-compose file and conf/config.yml.
docker-compose:
version: '2'
services:
prometheus:
image: prom/prometheus
container_name: prometheus
volumes:
- /prometheus:/prometheus
- ./conf/prome.yml:/etc/prometheus/prometheus.yml
command:
- --config.file=/etc/prometheus/prometheus.yml
ports:
- '6009:9090'
jmx-exporter:
image: sscaling/jmx-prometheus-exporter
container_name: jmx-exporter
ports:
- 6011:5556
depends_on:
- elassandra
elassandra:
image: strapdata/elassandra
container_name: elassandra
volumes:
- /var/lib/cassandra:/var/lib/cassandra
environment:
- CASSANDRA_LISTEN_ADDRESS=localhost
- CASSANDRA_RPC_ADDRESS=localhost
- CASSANDRA_START_RPC=false
- CASSANDRA_CLUSTER_NAME='DockerTest Cluster'
- CASSANDRA_NUM_TOKENS=8
- CASSANDRA#
- LOCAL_JMX="no"
- Dcassandra.jmx.remote.port="7199"
- Dcom.sun.management.jmxremote.port="7199"
- Dcom.sun.management.jmxremote.rmi.port="7199"
- Dcom.sun.management.jmxremote.authenticate=false
- JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=127.0.0.1"
- JMX_PORT="7199"
- JVM_OPTS="$JVM_OPTS -Dcassandra.jmx.remote.port=5556"
- JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.rmi.port=5556"
- JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.authenticate=false"
volumes:
prometheus_data: {}
elassandra_data: {}
conf/config.yml
startDelaySeconds: 0
hostPort: elassandra:7199
#username:
#password:
#jmxUrl: service:jmx:rmi:///jndi/rmi://127.0.0.1:60/jmxrmi
ssl: false
lowercaseOutputName: false
lowercaseOutputLabelNames: false
whitelistObjectNames: ["org.apache.cassandra.metrics:*"]
blacklistObjectNames: ["org.apache.cassandra.metrics:type=ColumnFamily,*"]
rules:
- pattern: 'org.apache.cassandra.metrics<type=(\w+), name=(\w+)><>Value: (\d+)'
name: cassandra_$1_$2
value: $3
valueFactor: 0.001
labels: {}
help: "Cassandra metric $1 $2"
type: GAUGE
attrNameSnakeCase: false
whenever I run docker-compose -f docker-compose.yml up, I face with the following page on localhost:6011:
The problem is that I don't know how to monitor elassandra and its metrics using jmx-exporter, I mainly get the java metrics!

Answer 1

In your config.yml you're using hostPort: localhost:5556 but you should try to connect to the host elassandra (the name of your docker container in your docker-compose.yml file).
Make sure Elassandra is configured properly to allow remote JMX connections. See How to enable remote JMX connections in Elassandra? for details how to set that up.