Clustering

# Setting that specifies how much memory Neo4j is allowed to use for the page cache.
dbms.memory.pagecache.size=100M

# Setting that specifies the initial JVM heap size.
dbms.memory.heap.initial_size=100M

# Strategy that the instance will use to determine the addresses of other members.
causal_clustering.discovery_type=DNS

# The network addresses of an initial set of Core cluster members that are available to bootstrap this Core or Read Replica instance.
# If the DNS strategy is used, the addresses are fetch using the DNS A records.
causal_clustering.initial_discovery_members=neo4j-network:5000

# Address (the public hostname/IP address of the machine)
# and port setting that specifies where this instance advertises for discovery protocol messages from other members of the cluster.
causal_clustering.discovery_advertised_address=$(hostname -i)

# Address (the public hostname/IP address of the machine)
# and port setting that specifies where this instance advertises for Raft messages within the Core cluster.
causal_clustering.raft_advertised_address=$(hostname)

 # Address (the public hostname/IP address of the machine)
 # and port setting that specifies where this instance advertises for requests for transactions in the transaction-shipping catchup protocol.
causal_clustering.transaction_advertised_address=$(hostname)

# Enable server side routing
dbms.routing.enabled=true

# Use server side routing for neo4j:// protocol connections.
dbms.routing.default_router=SERVER

# The advertised address for the intra-cluster routing connector.
dbms.routing.advertised_address=$(hostname)

version: '3.8'

# Custom top-level network
networks:
  neo4j-internal:

services:

  core1:
    # Docker image to be used
    \image: ${NEO4J_DOCKER_IMAGE}

    # Hostname
    hostname: core1

    # Service-level network, which specifies the networks, from the list of the top-level networks (in this case only neo4j-internal), that the server will connect to.
    # Adds a network alias (used in neo4j.conf when configuring the discovery members)
    networks:
      neo4j-internal:
        aliases:
          - neo4j-network

    # The ports that will be accessible from outside the container - HTTP (7474) and Bolt (7687).
    ports:
      - "7474:7474"
      - "7687:7687"

    # Uncomment the volumes to be mounted to make them accessible from outside the container.
    volumes:
      - ./neo4j.conf:/conf/neo4j.conf # This is the main configuration file.
      - ./data/core1:/var/lib/neo4j/data
      - ./logs/core1:/var/lib/neo4j/logs
      - ./conf/core1:/var/lib/neo4j/conf
      - ./import/core1:/var/lib/neo4j/import
      #- ./metrics/core1:/var/lib/neo4j/metrics
      #- ./licenses/core1:/var/lib/neo4j/licenses
      #- ./ssl/core1:/var/lib/neo4j/ssl

    # Passes the following environment variables to the container
    environment:
      - NEO4J_ACCEPT_LICENSE_AGREEMENT
      - NEO4J_AUTH
      - EXTENDED_CONF
      - NEO4J_EDITION
      - NEO4J_dbms_mode=CORE

    # Simple check testing whether the port 7474 is opened.
    # If so, the instance running inside the container is considered as "healthy".
    # This status can be checked using the "docker ps" command.
    healthcheck:
      test: ["CMD-SHELL", "wget --no-verbose --tries=1 --spider localhost:7474 || exit 1"]

    # Set up the user
    user: ${USER_ID}:${GROUP_ID}

  core2:
    \image: ${NEO4J_DOCKER_IMAGE}
    hostname: core2
    networks:
      neo4j-internal:
        aliases:
          - neo4j-network
    ports:
      - "7475:7474"
      - "7688:7687"
    volumes:
      - ./neo4j.conf:/conf/neo4j.conf
      - ./data/core2:/var/lib/neo4j/data
      - ./logs/core2:/var/lib/neo4j/logs
      - ./conf/core2:/var/lib/neo4j/conf
      - ./import/core2:/var/lib/neo4j/import
      #- ./metrics/core2:/var/lib/neo4j/metrics
      #- ./licenses/core2:/var/lib/neo4j/licenses
      #- ./ssl/core2:/var/lib/neo4j/ssl
    environment:
      - NEO4J_ACCEPT_LICENSE_AGREEMENT
      - NEO4J_AUTH
      - EXTENDED_CONF
      - NEO4J_EDITION
      - NEO4J_dbms_mode=CORE
    healthcheck:
      test: ["CMD-SHELL", "wget --no-verbose --tries=1 --spider localhost:7474 || exit 1"]
    user: ${USER_ID}:${GROUP_ID}

  core3:
    \image: ${NEO4J_DOCKER_IMAGE}
    hostname: core3
    networks:
      neo4j-internal:
        aliases:
          - neo4j-network
    ports:
      - "7476:7474"
      - "7689:7687"
    volumes:
      - ./neo4j.conf:/conf/neo4j.conf
      - ./data/core3:/var/lib/neo4j/data
      - ./logs/core3:/var/lib/neo4j/logs
      - ./conf/core3:/var/lib/neo4j/conf
      - ./import/core3:/var/lib/neo4j/import
      #- ./metrics/core3:/var/lib/neo4j/metrics
      #- ./licenses/core3:/var/lib/neo4j/licenses
      #- ./ssl/core3:/var/lib/neo4j/ssl
    environment:
      - NEO4J_ACCEPT_LICENSE_AGREEMENT
      - NEO4J_AUTH
      - EXTENDED_CONF
      - NEO4J_EDITION
      - NEO4J_dbms_mode=CORE
    healthcheck:
      test: ["CMD-SHELL", "wget --no-verbose --tries=1 --spider localhost:7474 || exit 1"]
    user: ${USER_ID}:${GROUP_ID}

  readreplica1:
    \image: ${NEO4J_DOCKER_IMAGE}
    hostname: replica1
    networks:
      neo4j-internal:
        aliases:
          - neo4j-network
    ports:
      - "7477:7474"
      - "7690:7687"
    volumes:
      - ./neo4j.conf:/conf/neo4j.conf
      - ./data/replica1:/var/lib/neo4j/data
      - ./logs/replica1:/var/lib/neo4j/logs
      - ./conf/replica1:/var/lib/neo4j/conf
      - ./import/replica1:/var/lib/neo4j/import
      #- ./metrics/replica1:/var/lib/neo4j/metrics
      #- ./licenses/replica1:/var/lib/neo4j/licenses
      #- ./ssl/replica1:/var/lib/neo4j/ssl
    environment:
      - NEO4J_ACCEPT_LICENSE_AGREEMENT
      - NEO4J_AUTH
      - EXTENDED_CONF
      - NEO4J_EDITION
      - NEO4J_dbms_mode=READ_REPLICA
    healthcheck:
      test: ["CMD-SHELL", "wget --no-verbose --tries=1 --spider localhost:7474 || exit 1"]
    user: ${USER_ID}:${GROUP_ID}