ElasticSeach detailed installation tutorial--graphic and text introduction is super detailed

content

Preliminary preparation

create user

Download the installation package of ElasticSeach, this case uses version 6.2.4

Modify the configuration item jvm.options

Modify the configuration item elasticsearch.yml

Solve the error

Start Elasticsearch

1.3.1. Error 1: Kernel is too low

1.3.2. Error 2: Insufficient file permissions

1.3.3. Error 3: Not enough threads

1.3.4. Error 4: Process virtual memory

Started successfully

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Elasticsearch is a distributed, RESTful search and data analysis engine that addresses a wide variety of emerging use cases. At the heart of the Elastic Stack, it stores your data centrally, helping you discover the unexpected and the unexpected.

Elasticsearch is a JSON-based distributed search and analysis engine.

Developed in the Java language and released as open source under the terms of the Apache License, Elasticsearch is a popular enterprise-grade search engine. Elasticsearch is used in cloud computing to achieve real-time search, stable, reliable, fast, and easy to install and use.

• Distributed real-time file storage, every field is indexed and searchable
• Distributed search engine for real-time analysis

• Scalable to hundreds of servers, processing petabytes of structured or unstructured data

Official website address: Elasticsearch: The official distributed search and analysis engine | Elastic

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Preliminary preparation

For security reasons, elasticsearch is not allowed to run as root by default.

ES cannot be installed with the root user, and a normal user is required.

create user

# 创建用户
useradd leyou 

# 设置密码
passwd leyou

# 切换用户
su - leyou

Download the installation package of ElasticSeach, this case uses version 6.2.4

# 解压缩安装包
tar -zxvf elasticsearch-6.2.4.tar.gz

# 将文件夹重命名
mv elasticsearch-6.3.0/ elasticsearch

# 进入config目录
cd config

Modify the configuration item jvm.options

# 编辑jvm.options：

vim jvm.options

# 默认配置如下：

-Xms1g
-Xmx1g

内存占用太多了，我们调小一些：

-Xms512m
-Xmx512m

Modify the configuration item elasticsearch.yml

# 编辑elasticsearch.yml

 vim elasticsearch.yml

# 修改数据和日志目录：(我们需要按照这个路径创建存储数据和日志的文件夹)

path.data: /home/leyou/elasticsearch/data # 数据目录位置
path.logs: /home/leyou/elasticsearch/logs # 日志目录位置


# 继续修改elasticsearch.yml
# 默认只允许本机访问，修改为0.0.0.0后则可以远程访问

network.host: 0.0.0.0 # 绑定到0.0.0.0，允许任何ip来访问

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Solve the error

Start Elasticsearch

Enter the bin directory and enter the startup command

./elasticsearch

Failed to start, there is a problem with the configuration item, which needs to be resolved.

1.3.1. Error 1: Kernel is too low

Modify the elasticsearch.yml file and add the following configuration at the bottom:

bootstrap.system_call_filter: false

1.3.2. Error 2: Insufficient file permissions

报错日志： max file descriptors [4096] for elasticsearch process likely too low, increase to at least

# 退出当前用户
exit
# 提升文件权限
vim /etc/security/limits.conf

# 添加下面的内容：

* soft nofile 65536

* hard nofile 131072

* soft nproc 4096

* hard nproc 4096

1.3.3. Error 3: Not enough threads

Error log: max number of threads [1024] for user [leyou] is too low, increase to at least [4096]

# 修改线程数
vim /etc/security/limits.d/90-nproc.conf
或者 vim /etc/security/limits.d/20-nproc.conf

# 将soft nproc 改为：

* soft nproc 4096

1.3.4. Error 4: Process virtual memory

Error log: max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144]

vim /etc/sysctl.conf

# 添加下面内容：
vm.max_map_count=655360

# 然后执行命令：
sysctl -p

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Started successfully

Enter the bin directory, enter the command, and finally print out started, indicating that the startup is successful

./elasticsearch

You can use http://127.0.0.1:9200. If data is returned, it means the startup is successful.

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