Step-by-Step Guide to Installing Elasticsearch 7.x, Elasticsearch‑head, and Sample 6.x Configuration

Elasticsearch is currently the most popular search engine, and the first step to learning ES is installation and deployment. This guide is divided into three parts: installing Elasticsearch 7.x (single node), installing Elasticsearch‑head, and providing an online Elasticsearch 6.x configuration.

1. Install Elasticsearch 7.x

Download the Elasticsearch 7.1.1 package from https://www.elastic.co/cn/downloads/past-releases/elasticsearch-7-1-1 . Since version 7.0 the JDK is bundled, so a separate JDK installation is optional.

# Create directories and extract Elasticsearch
mkdir /{app,data}

tar zxf elasticsearch-7.1.1-linux-x86_64.tar.gz -C /app

# Create elasticsearch user
useradd elasticsearch
passwd elasticsearch

# Rename directory and change ownership
cd /app
mv elasticsearch-7.1.1 elasticsearch
chown elasticsearch:elasticsearch -R elasticsearch/

Elasticsearch must not be started as the root user.

2. Configuration (elasticsearch.yml)

cluster.name: es-cluster
node.name: es-01
path.data: /data
path.logs: /app/elasticsearch/logs
bootstrap.memory_lock: true
bootstrap.system_call_filter: false
http.cors.enabled: true
http.cors.allow-origin: "*"
network.host: 192.168.10.130
http.port: 9200
discovery.seed_hosts: ["192.168.10.130"]
cluster.initial_master_nodes: ["es-01"]
node.master: true
node.data: true

For a single‑node cluster both node.master and node.data are set to true. Adjust these flags for multi‑node clusters.

3. JVM Options (jvm.options)

-Xms4g
-Xmx4g

It is recommended that the heap size not exceed half of the physical memory.

4. Start Elasticsearch ./bin/elasticsearch -d The -d flag runs the process in the background. Verify the startup with: curl -XGET "192.168.10.130:9200/" 5. Install Elasticsearch‑head

Download the master branch from https://github.com/mobz/elasticsearch-head and deploy it to Tomcat (e.g., /app/tomcat-es-head/webapps).

# Unzip to Tomcat webapps
unzip -d /app/tomcat-es-head/webapps elasticsearch-head-master.zip
cd /app/tomcat-es-head/webapps
mv elasticsearch-head-master elasticsearch-head

After deployment, edit /app/tomcat-es-head/webapps/elasticsearch-head/_site/app.js to set base_uri to the Elasticsearch HTTP address (default port 9200).

Start Tomcat (port 9100 in the example) and access the Head UI to manage indices and view data.

6. Reference Elasticsearch 6.x Configuration

cluster.name: es-prod-cluster
node.name: es-prod-01
path.data: /data01,/data02,/data03
path.logs: ${ES_HOME}/logs
bootstrap.memory_lock: true
bootstrap.system_call_filter: false
http.cors.enabled: true
http.cors.allow-origin: "*"
network.host: ${IP}
http.port: 9200
discovery.zen.ping.unicast.hosts: ["otc-hadoop-es-01","otc-hadoop-es-02","otc-hadoop-es-03","otc-hadoop-es-04","otc-hadoop-es-05","otc-hadoop-es-06"]
discovery.zen.minimum_master_nodes: 3
node.master: true
node.data: true

This configuration is provided for reference; actual deployments may require adjustments for file descriptor limits, thread limits, virtual memory settings, etc.