Install ElasticSearch in Centos7 and start running

Download ElasticSearch

Since downloading from the official website is particularly slow, I chose to use the domestic mirror address of Huawei Cloud.

installation

• Upload to the cloud server through the sftp tool, and decompress it by using the command
  tar -zxvf elasticsearch-7.4.2

• Use the command to move the folder to local for easy management
  cp -r elasticsearch-7.4.2 /usr/local

• Modify the configuration file
  vim elasticsearch-7.4.2/config/elasticsearch.yml
  
  I have modified the following configuration items:

  cluster.name: #集群的名字
  node.name:   #节点名字，在集群中是有多个node组成的
  path.data: /usr/local/elasticsearch-7.4.2/data #数据存储的地方，需要创建data文件夹
  path.logs: /usr/local/elasticsearch-7.4.2/logs  #日志存储的文件夹
  network.host: 0.0.0.0
  cluster.initial_master_nodes: #该地方取的是node.name的值
  

Servers with small memory can be modified, the system defaults to 1g
vim elasticsearch-7.4.2/config/jvm.options

start up

• Because I am currently the root user, create a user
  useradd esuser
• Change the role of the file
  chown -R esuser /usr/local/elasticsearch-7.4.2
• Start, wait for error
  ./usr/local/elasticsearch-7.4.2/elasticsearch
  
• You need to switch to the esuser user and run it again.
  su esuser
  Use the following command to solve the problem. chown -R esuser:esuser /usr/local/elasticsearch-7.4.2
  Start again and report the following exception.
  
  These are configuration problems related to the environment. Switch to the root user, execute the following command, and add the content as shown in the figure.
  vim /etc/security/limits.conf
  
  Execute vim /etc/security/limits.confadd and add at the bottom of the file Use sysctl -pto refresh
  
  once again switch to esuser user execution. ./elasticsearchBackground execution ./elasticsearch -d
  
  . Successful startup, access through the above address!