Neo4j

Neo4j is a highly scalable native graph database that leverages data relationships as first-class entities, helping enterprises build intelligent applications to meet today’s evolving data challenges.

TL;DR;

$ helm install stable/neo4j

Introduction

This chart bootstraps a Neo4j deployment on a Kubernetes cluster using the Helm package manager.

Prerequisites

• Kubernetes 1.6+ with Beta APIs enabled
• PV provisioner support in the underlying infrastructure
• Requires the following variables You must add acceptLicenseAgreement in the values.yaml file and set it to yes or include --set acceptLicenseAgreement=yes in the command line of helm install to accept the license.

Installing the Chart

To install the chart with the release name neo4j-helm:

$ helm install --name neo4j-helm stable/neo4j --set acceptLicenseAgreement=yes --set neo4jPassword=mySecretPassword

You must explicitly accept the neo4j license agreement for the installation to be successful.

The command deploys Neo4j on the Kubernetes cluster in the default configuration but with the password set to mySecretPassword. The configuration section lists the parameters that can be configured during installation.

Tip: List all releases using helm list

Uninstalling the Chart

To uninstall/delete the neo4j-helm deployment:

$ helm delete neo4j-helm --purge

The command removes all the Kubernetes components associated with the chart and deletes the release.

Configuration

The following table lists the configurable parameters of the Neo4j chart and their default values.

Parameter	Description	Default
image	Neo4j image	neo4j
imageTag	Neo4j version	{VERSION}
imagePullPolicy	Image pull policy	IfNotPresent
podDisruptionBudget	Pod disruption budget	{}
authEnabled	Is login/password required?	true
core.numberOfServers	Number of machines in CORE mode	3
core.sideCarContainers	Sidecar containers to add to the core pod. Example use case is a sidecar which identifies and labels the leader when using the http API	{}
core.initContainers	Init containers to add to the core pod. Example use case is a script that installs the APOC library	{}
core.persistentVolume.enabled	Whether or not persistence is enabled	true
core.persistentVolume.storageClass	Storage class of backing PVC	standard (uses beta storage class annotation)
core.persistentVolume.size	Size of data volume	10Gi
core.persistentVolume.mountPath	Persistent Volume mount root path	/data
core.persistentVolume.subPath	Subdirectory of the volume to mount	nil
core.persistentVolume.annotations	Persistent Volume Claim annotations	{}
readReplica.numberOfServers	Number of machines in READ_REPLICA mode	0
readReplica.initContainers	Init containers to add to the replica pod. Example use case is a script that installs the APOC library	{}
resources	Resources required (e.g. CPU, memory)	{}
clusterDomain	Cluster domain	cluster.local

The above parameters map to the env variables defined in the Neo4j docker image.

Specify each parameter using the --set key=value[,key=value] argument to helm install. For example,

$ helm install --name neo4j-helm --set core.numberOfServers=5,readReplica.numberOfServers=3 stable/neo4j

The above command creates a cluster containing 5 core servers and 3 read replicas.

Alternatively, a YAML file that specifies the values for the parameters can be provided while installing the chart. For example,

$ helm install --name neo4j-helm -f values.yaml stable/neo4j

Tip: You can use the default values.yaml

Once you have all 3 pods in running, you can run the "test.sh" script in this directory, which will verify the role attached to each pod and also test recovery of a failed/deleted pod. This script requires that the $RELEASE_NAME environment variable be set, in order to access the pods, if you have specified a custom namespace or replicas value when installing you can set those via RELEASE_NAMESPACE and CORE_REPLICAS environment variables for this script.