Secure communication with Elasticsearch

To secure the communication between Metricbeat and Elasticsearch, you can use HTTPS and basic authentication. Here is a sample configuration:

output.elasticsearch:
  username: metricbeat 
  password: verysecret 
  protocol: https 
  hosts: ["elasticsearch.example.com:9200"] 

Elasticsearch doesn’t have built-in basic authentication, but you can achieve it either by using a web proxy or by using X-Pack to secure Elasticsearch. For more information, see the X-Pack documentation about securing Elasticsearch and Metricbeat and X-Pack Security.

Metricbeat verifies the validity of the server certificates and only accepts trusted certificates. Creating a correct SSL/TLS infrastructure is outside the scope of this document.

By default Metricbeat uses the list of trusted certificate authorities from the operating system where Metricbeat is running. You can configure Metricbeat to use a specific list of CA certificates instead of the list from the OS. You can also configure it to use client authentication by specifying the certificate and key to use when the server requires the Beat to authenticate. Here is an example configuration:

output.elasticsearch:
  username: metricbeat
  password: verysecret
  protocol: https
  hosts: ["elasticsearch.example.com:9200"]
  ssl.certificate_authorities: 
    - /etc/pki/my_root_ca.pem
    - /etc/pki/my_other_ca.pem
  ssl.certificate: "/etc/pki/client.pem" 
  ssl.key: "/etc/pki/key.pem"