Docker ELK stack
Run the latest version of the ELK (Elasticseach, Logstash, Kibana) stack with Docker and Docker-compose.
It will give you the ability to analyze any data set by using the searching/aggregation capabilities of Elasticseach and the visualization power of Kibana.
Based on the official images:
On distributions which have SELinux enabled out-of-the-box you will need to either re-context the files or set SELinux into Permissive mode in order for docker-elk to start properly.
For example on Redhat and CentOS, the following will apply the proper context:
.-root@centos ~ -$ chcon -R system_u:object_r:admin_home_t:s0 fig-elk/
Start the ELK stack using docker-compose:
$ docker-compose up
You can also choose to run it in background (detached mode):
$ docker-compose up -d
Now that the stack is running, you'll want to inject logs in it. The shipped logstash configuration allows you to send content via tcp:
$ nc localhost 5000 < /path/to/logfile.log
And then access Kibana UI by hitting http://localhost:5601 with a web browser.
NOTE: You'll need to inject data into logstash before being able to create a logstash index in Kibana. Then all you should have to do is to
hit the create button.
You can also access:
NOTE: In order to use Sense, you'll need to query the IP address associated to your network device instead of localhost.
By default, the stack exposes the following ports:
- 5000: Logstash TCP input.
- 9200: Elasticsearch HTTP
- 9300: Elasticsearch TCP transport
- 5601: Kibana
WARNING: If you're using boot2docker, you must access it via the boot2docker IP address instead of localhost.
WARNING: If you're using Docker Toolbox, you must access it via the docker-machine IP address instead of localhost.
NOTE: Configuration is not dynamically reloaded, you will need to restart the stack after any change in the configuration of a component.
How can I tune Kibana configuration?
The Kibana default configuration is stored in
How can I tune Logstash configuration?
The logstash configuration is stored in
logstash/config is mapped onto the container
/etc/logstash/conf.d so you
can create more than one file in that folder if you'd like to. However, you must be aware that config files will be read from the directory in alphabetical order.
How can I specify the amount of memory used by Logstash?
The Logstash container use the LS_HEAP_SIZE environment variable to determine how much memory should be associated to the JVM heap memory (defaults to 500m).
If you want to override the default configuration, add the LS_HEAP_SIZE environment variable to the container in the
logstash: image: logstash:latest command: logstash -f /etc/logstash/conf.d/logstash.conf volumes: - ./logstash/config:/etc/logstash/conf.d ports: - "5000:5000" links: - elasticsearch environment: - LS_HEAP_SIZE=2048m
How can I enable a remote JMX connection to Logstash?
As for the Java heap memory, another environment variable allows to specify JAVA_OPTS used by Logstash. You'll need to specify the appropriate options to enable JMX and map the JMX port on the docker host.
Update the container in the
docker-compose.yml to add the LS_JAVA_OPTS environment variable with the following content (I've mapped the JMX service on the port 18080, you can change that), do not forget to update the -Djava.rmi.server.hostname option with the IP address of your Docker host (replace DOCKER_HOST_IP):
logstash: image: logstash:latest command: logstash -f /etc/logstash/conf.d/logstash.conf volumes: - ./logstash/config:/etc/logstash/conf.d ports: - "5000:5000" - "18080:18080" links: - elasticsearch environment: - LS_JAVA_OPTS=-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.port=18080 -Dcom.sun.management.jmxremote.rmi.port=18080 -Djava.rmi.server.hostname=DOCKER_HOST_IP -Dcom.sun.management.jmxremote.local.only=false
How can I tune Elasticsearch configuration?
The Elasticsearch container is using the shipped configuration and it is not exposed by default.
If you want to override the default configuration, create a file
elasticsearch/config/elasticsearch.yml and add your configuration in it.
Then, you'll need to map your configuration file inside the container in the
docker-compose.yml. Update the elasticsearch container declaration to:
elasticsearch: build: elasticsearch/ command: elasticsearch -Des.network.host=_non_loopback_ ports: - "9200:9200" volumes: - ./elasticsearch/config/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml
You can also specify the options you want to override directly in the command field:
elasticsearch: build: elasticsearch/ command: elasticsearch -Des.network.host=_non_loopback_ -Des.cluster.name: my-cluster ports: - "9200:9200"
How can I store Elasticsearch data?
The data stored in Elasticsearch will be persisted after container reboot but not after container removal.
In order to persist Elasticsearch data even after removing the Elasticsearch container, you'll have to mount a volume on your Docker host. Update the elasticsearch container declaration to:
elasticsearch: build: elasticsearch/ command: elasticsearch -Des.network.host=_non_loopback_ ports: - "9200:9200" volumes: - /path/to/storage:/usr/share/elasticsearch/data
This will store elasticsearch data inside