Building a Elasticsearch cluster using Docker-Compose and Traefik

# Secret will be used to sign session cookies, CSRF tokens and for other encryption utilities.
# It is highly recommended to change this value before running cerebro in production.
secret = "ki:s:[[@=Ag?QI`W2jMwkY:eqvrJ]JqoJyi2axj3ZvOv^/KavOT4ViJSv?6YY4[N"

# Application base path
basePath = "/admin/"

# Defaults to RUNNING_PID at the root directory of the app.
# To avoid creating a PID file set this value to /dev/null
#pidfile.path = "/var/run/cerebro.pid"
pidfile.path=/dev/null

# Rest request history max size per user
rest.history.size = 50 // defaults to 50 if not specified

# Path of local database file
#data.path: "/var/lib/cerebro/cerebro.db"
data.path = "./cerebro.db"

play {
  # Cerebro port, by default it's 9000 (play's default)
  server.http.port = ${?CEREBRO_PORT}
}

es = {
  gzip = true
}

# Authentication
auth = {
  # either basic or ldap
  type: ${?AUTH_TYPE}
  settings {
    # LDAP
    url = ${?LDAP_URL}
    # OpenLDAP might be something like "ou=People,dc=domain,dc=com"
    base-dn = ${?LDAP_BASE_DN}
    # Usually method should  be "simple" otherwise, set it to the SASL mechanisms to try
    method = ${?LDAP_METHOD}
    # user-template executes a string.format() operation where
    # username is passed in first, followed by base-dn. Some examples
    #  - %s => leave user untouched
    #  - %s@domain.com => append "@domain.com" to username
    #  - uid=%s,%s => usual case of OpenLDAP
    user-template = ${?LDAP_USER_TEMPLATE}
    // User identifier that can perform searches
    bind-dn = ${?LDAP_BIND_DN}
    bind-pw = ${?LDAP_BIND_PWD}
    group-search {
      // If left unset parent's base-dn will be used
      base-dn = ${?LDAP_GROUP_BASE_DN}
      // Attribute that represent the user, for example uid or mail
      user-attr = ${?LDAP_USER_ATTR}
      // Define a separate template for user-attr
      // If left unset parent's user-template will be used
      user-attr-template = ${?LDAP_USER_ATTR_TEMPLATE}
      // Filter that tests membership of the group. If this property is empty then there is no group membership check
      // AD example => memberOf=CN=mygroup,ou=ouofthegroup,DC=domain,DC=com
      // OpenLDAP example => CN=mygroup
      group = ${?LDAP_GROUP}
    }

    # Basic auth
    username = ${?BASIC_AUTH_USER}
    password = ${?BASIC_AUTH_PWD}
  }
}

# A list of known hosts
hosts = [
  {
   host = "http://elasticsearch"
   name = "traefik-tutorial-cluster"
   headers-whitelist = [ "x-proxy-user", "x-proxy-roles", "X-Forwarded-For" ]
  }
  # Example of host with authentication
  # {
  #  host = "http://some-authenticated-host:9200"
  #  name = "Secured Cluster"
  #  auth = {
  #    username = "username"
  #    password = "secret-password"
  #  }
  # }
]

version: '3.7'

services:
  gateway:
    image: traefik:v2.2
    command:
      - --api.insecure=true
      - --providers.docker=true
      - --providers.docker.exposedByDefault=false
    ports:
      - "80:80"
      - "8080:8080"
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro

  es01:
    image: "docker.elastic.co/elasticsearch/elasticsearch-oss:7.7.1"
    environment:
      node.name: es01
      discovery.seed_hosts: es02
      cluster.initial_master_nodes: es01,es02
      cluster.name: traefik-tutorial-cluster
      bootstrap.memory_lock: "true"
      ES_JAVA_OPTS: -Xms256m -Xmx256m
    volumes:
      - "es-data-es01:/usr/share/elasticsearch/data"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.elasticsearch.entrypoints=http"
      - "traefik.http.routers.elasticsearch.rule=Host(`localhost`) && PathPrefix(`/es`) || Host(`elasticsearch`)"
      - "traefik.http.routers.elasticsearch.middlewares=es-stripprefix"
      - "traefik.http.middlewares.es-stripprefix.stripprefix.prefixes=/es"
      - "traefik.http.services.elasticsearch.loadbalancer.server.port=9200"

  es02:
    image: "docker.elastic.co/elasticsearch/elasticsearch-oss:7.7.1"
    environment:
      node.name: es02
      discovery.seed_hosts: es01
      cluster.initial_master_nodes: es01,es02
      cluster.name: traefik-tutorial-cluster
      bootstrap.memory_lock: "true"
      ES_JAVA_OPTS: -Xms256m -Xmx256m
    volumes:
      - "es-data-es02:/usr/share/elasticsearch/data"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.elasticsearch.entrypoints=http"
      - "traefik.http.routers.elasticsearch.rule=Host(`localhost`) && PathPrefix(`/es`) || Host(`elasticsearch`)"
      - "traefik.http.routers.elasticsearch.middlewares=es-stripprefix"
      - "traefik.http.middlewares.es-stripprefix.stripprefix.prefixes=/es"
      - "traefik.http.services.elasticsearch.loadbalancer.server.port=9200"

  cerebro:
    image: lmenezes/cerebro:0.8.5
    volumes:
      - "./conf/cerebro/application.conf:/opt/cerebro/conf/application.conf"
    depends_on:
      - gateway
    links:
      - "gateway:elasticsearch"
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.admin.entrypoints=http"
      - "traefik.http.routers.admin.rule=Host(`localhost`) && PathPrefix(`/admin`)"
      - "traefik.http.services.cerebro.loadbalancer.server.port=9000"

volumes:
  es-data-es01:
  es-data-es02: