Build ES development environment.
Installation instructions

1. Environment: centos7

Java : java8
elasticsearch-6.5.4

1. Download address

$ cd ~
$ cd download
$ wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.5.4.tar.gz

1. Pre-installation Conditions
   Note: The article has been configured by default version 1.8 jdk, if not, please configure it first!

   1. Install git
   2. Installing node.js (elastic searc-head must)
   3. Install net-tools

2. Reference material
   https://www.cnblogs.com/--1024/p/9306661.html?tdsourcetag=s_pctim_aiomsg

3. Installation Directory Description
   The installation directories are in the / opt / elastic search directory, including elastic search, elastic search-head
   So this document installs elastic search, ik, elastic search-head

1. Installation steps
2. Installation Configuration ES
   1). New elastic search directory

cd /opt
sudo mkdir elasticsearch

Unzip ES to the bottom of the / opt / elastic search directory

cd download
sudo tar -xvf elasticsearch-6.5.4.tar.gz -C /opt/elasticsearch/

2. Elastic search configuration
Modify elastic search.yml

cd /opt/elasticsearch/elasticsearch-6.5.4/config
sudo vim elasticsearch.yml

Modify the following items (configure the cluster name, where the port defaults to 9200, and change http.port if necessary)

cluster.name: xxx-es

network.host: 0.0.0.0

path.logs: /home/apps/elasticsearch-6.3.1/logs

path.data: /home/apps/elasticsearch-6.3.1/data   #By default, there is no directory, so you need to manually create new mkdir data

//Add the following two configurations (cross-domain access)
http.cors.enabled: true

http.cors.allow-origin: "*"

Save the changes.

3. New startup user (root role is not allowed after ES5.0)

#Add user
adduser centos

#Set password
passwd centos

#To grant authorization
chown -R centos /centos elasticsearch

#Switching users
su centos

#start-up
cd /opt/elasticsearch/elasticsearch-6.5.4/bin
./elasticsearch

Startup may report the following error:

Switch back to the root role and authorize the user once more. It may be that the file is newly created at startup and has no privileges.

su root
chown -R centos /opt/elasticsearch/elasticsearch-6.5.4

Error Solution
Start again and find that the error is still reported

Cause: Local file cannot be created. The maximum number of files that users can create is too small.
Solution:

# Switch back to the root account, or change it in sudo mode
su root
 # Modify the limits.conf file
vi /etc/security/limits.conf
 Add the following configuration at the bottom of the file
* soft nofile 65536
* hard nofile 131072
* soft nproc 2048
* hard nproc 4096

Switch back to the elastic search account, start ES again, and report a mistake

Cause: Max virtual memory is too small
Solution:

# Switch to root account
su root
 # Modify sysctl.conf
vi /etc/sysctl.conf
 Add the following configuration
vm.max_map_count=655360

Execute sysctl -p to refresh the configuration. Switch back to the elastic search user and start ES again
Another case is that the actual machine memory is very small, resulting in insufficient startup memory.
Solution: Configure jvm usage size
There is a jvm.options under the config file by modifying the configuration information.

Configure the size according to the actual situation. The default configuration in ES is 1G.

Start successfully! Let's open the browser and visit it.~

Ps: Firewall configuration
We have configured all the nodes to be accessible before, and also configure the cross-domain. Why can't we open it?
Don't forget there's still a firewall. The 9200 external access port needs to be opened
Enter the following commands in the console

#Open port 9200
firewall-cmd --zone=public --add-port=9200/tcp --permanen

#Refresh configuration
firewall-cmd --reload

Okay, so that's the end of the configuration of ~ES.

1. Install IK word segmenter

1. download
   Select Version Website

https://github.com/medcl/elasticsearch-analysis-ik/releases

6.5.4 Download link:

https://github-production-release-asset-2e65be.s3.amazonaws.com/2993595/c26d1080-0662-11e9-8126-57843dc6fdd2?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20190130%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20190130T031318Z&X-Amz-Expires=300&X-Amz-Signature=14938947077b9df77552345a3e199240bb9489f8abfc0c4ac2f1173ea2d0fb3b&X-Amz-SignedHeaders=host&actor_id=22309140&response-content-disposition=attachment%3B%20filename%3Delasticsearch-analysis-ik-6.5.4.zip&response-content-type=application%2Foctet-stream

Download ik word segmenter

cd download
wget https://github-production-release-asset-2e65be.s3.amazonaws.com/2993595/c26d1080-0662-11e9-8126-57843dc6fdd2?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20190127%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20190127T040443Z&X-Amz-Expires=300&X-Amz-Signature=f202316c2c3cf8a0ec2492698d4ef67eaa23e10c8b8d7a84e8814e68d320352d&X-Amz-SignedHeaders=host&actor_id=22309140&response-content-disposition=attachment%3B%20filename%3Delasticsearch-analysis-ik-6.5.4.zip&response-content-type=application%2Foctet-stream

2) Installation and deployment

// move
mv elasticsearch-analysis-ik-6.5.4.zip /opt/elasticsearch/elasticsearch-6.5.4/plugins/
cd /opt/elasticsearch/elasticsearch-6.5.4/plugins/ik
// decompression
unzip elasticsearch-analysis-ik-6.5.4.zip
// Delete old files
sudo rm -rf elasticsearch-analysis-ik-6.5.4.zip

Once configured, restart ES and load the ik segmenter automatically.

1. Install elastic search-head
   Download elastic search-head

cd  /opt/ elasticsearch
git clone https://github.com/mobz/elasticsearch-head

Arrange and configure environment information such as node.js (ps: install node JS and npm in yum mode).
Reference material:

https://blog.csdn.net/lu_embedded/article/details/79138650
https://blog.csdn.net/xiao_jun_0820/article/details/50838185

Install Node.js from the EPEL Library
An effective and simple way to install Node.js is to download and install it from the official library. First, make sure you have access to the EPEL library. You can install it by running the following commands.

sudo yum install epel-release

Now you can install Node.js using the yum command

sudo yum install nodejs

Because I need to manage the node packages during the development process, I also need to install the new public management package manager, using the following commands. (Note: Since the new version of nodejs has integrated npm, this step can be ignored.)

sudo yum install npm

Check:

# node --version
v6.12.2
# npm --version
3.10.10

As you can see, if installed in this way, the version is old.
Install grunt to start head
# Install grunt command-line tool grunt-cli

npm install -g grunt-cli

# Installing grunt and its plug-ins

npm install grunt --save-dev

# View the installation version

grunt -version

Ps: There may be license issues when installing:

Reference: https://www.cnblogs.com/shengulong/p/6224908.html

Processing method:

Open the package.json file in the elastic search-head directory, find the license location, and modify it to the presence of Identifier on the website above.

Configure connection information

vi Gruntfile.js

Configure firewall after saving, open 9100 port, input in console

firewall-cmd --zone=public --add-port=9100/tcp --permanent
firewall-cmd --reload

Start head

grunt server

Errors will be reported at startup

These are referenced in Gruntfile.js and downloaded separately. ok

The way to do this is to install the grunt - ** above.

npm install grunt-contrib-copy
npm install grunt-contrib-concat
npm install grunt-contrib-uglify
npm install grunt-css

Install sudo npm install grunt-contrib-jasmine Times

The solution is:

sudo npm install phantomjs-prebuilt@2.1.16 --ignore-scripts

Enter in the browser http://192.168.101.110:9100

Installation completed!