# Centos7下Elasticsearch环境搭建（单机）

# 介绍

[TOC]

安装环境：

system：CentOS7

jdk:jdk1.8.0_221

elasticsearch:elasticsearch-7.3.0

# jdk安装

解压jdk包
```
tar -zvxf jdk-8u201-linux-x64.tar.gz
```
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配置环境变量

#修改/etc下profile文件，加入以下配置并使用source /etc/profile命令使之生效

#Java
export JAVA_HOME=/app/jdk1.8.0_221
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar 
export PATH=$PATH:$JAVA_HOME/bin

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# Elasticsearch安装

解压spark包

tar -zvxf elasticsearch-7.3.0-linux-x86_64.tar.gz

配置Elasticsearch

进入config 目录,编辑 elasticsearch.yml

# ======================== Elasticsearch Configuration =========================
#
# NOTE: Elasticsearch comes with reasonable defaults for most settings.
#       Before you set out to tweak and tune the configuration, make sure you
#       understand what are you trying to accomplish and the consequences.
#
# The primary way of configuring a node is via this file. This template lists
# the most important settings you may want to configure for a production cluster.
#
# Please consult the documentation for further information on configuration options:
# https://www.elastic.co/guide/en/elasticsearch/reference/index.html
#
# ---------------------------------- Cluster -----------------------------------
#
# Use a descriptive name for your cluster:
#
#cluster.name: my-application
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node:
#
#node.name: node-1
#
# Add custom attributes to the node:
#
#node.attr.rack: r1
#
# ----------------------------------- Paths ------------------------------------
#
# Path to directory where to store the data (separate multiple locations by comma):
#
#path.data: /path/to/data
#
# Path to log files:
#
#path.logs: /path/to/logs
#
# ----------------------------------- Memory -----------------------------------
#
# Lock the memory on startup:
#
#bootstrap.memory_lock: true
#
# Make sure that the heap size is set to about half the memory available
# on the system and that the owner of the process is allowed to use this
# limit.
#
# Elasticsearch performs poorly when the system is swapping the memory.
#
# ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
#配置IP为本机IP
network.host: 192.168.153.134
#network.host: 0.0.0.0
#
# Set a custom port for HTTP:
#
#配置访问端口，默认为9200
http.port: 9200
#
# For more information, consult the network module documentation.
#
# --------------------------------- Discovery ----------------------------------
#
# Pass an initial list of hosts to perform discovery when this node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
#discovery.seed_hosts: ["host1", "host2"]
#
# Bootstrap the cluster using an initial set of master-eligible nodes:
#
#cluster.initial_master_nodes: ["node-1", "node-2"]
#worker为主机名
cluster.initial_master_nodes: ["worker"]
#
# For more information, consult the discovery and cluster formation module documentation.
#
# ---------------------------------- Gateway -----------------------------------
#
# Block initial recovery after a full cluster restart until N nodes are started:
#
#gateway.recover_after_nodes: 3
#
# For more information, consult the gateway module documentation.
#
# ---------------------------------- Various -----------------------------------
#
# Require explicit names when deleting indices:
#
#action.destructive_requires_name: true

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启动Elasticsearch
- 进入bin 目录，执行如下命令
```
./elasticsearch
```
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- 后台启动
```
./elasticsearch -d
```
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浏览器访问http://localhost:9200/

# Elasticsearch head安装

安装node
安装git

下载head

git clone git://github.com/mobz/elasticsearch-head.git

安装head
```
cd elasticsearch-head
npm install
```
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修改Gruntfile.js配置,增加hostname:‘*‘配置(可选)

		connect: {
			server: {
				options: {
					port: 9100,
					base: '.',
					hostname:'*',
					keepalive: true
				}
			}
		}

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修改head/_site/app.js文件,修改head连接es的地址（修改localhost为本机的IP地址）

		init: function(parent) {
			this._super();
			this.prefs = services.Preferences.instance();
			this.base_uri = this.config.base_uri || this.prefs.get("app-base_uri") || "http://192.168.153.134:9200";
			if( this.base_uri.charAt( this.base_uri.length - 1 ) !== "/" ) {
				// XHR request fails if the URL is not ending with a "/"
				this.base_uri += "/";
			}
			if( this.config.auth_user ) {
				var credentials = window.btoa( this.config.auth_user + ":" + this.config.auth_password );
				$.ajaxSetup({
					headers: {
						"Authorization": "Basic " + credentials
					}
				});
			}
			this.cluster = new services.Cluster({ base_uri: this.base_uri });
			this._clusterState = new services.ClusterState({
				cluster: this.cluster
			});

			this._header = new ui.Header({ cluster: this.cluster, clusterState: this._clusterState });
			this.$body = $.joey( this._body_template() );
			this.el = $.joey(this._main_template());
			this.attach( parent );
			this.instances = {};
			this.el.find(".uiApp-headerMenuItem:first").click();
			if( this.config.dashboard ) {
				if( this.config.dashboard === "cluster" ) {
					var page = this.instances["ClusterOverview"];
					page._refreshButton.set( 5000 );
				}
			}
		}

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修改elasticsearch.yml，增加跨域的配置(需要重启es才能生效)
```
http.cors.enabled: true
http.cors.allow-origin: "*"
```
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启动
```
npm run start
```
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# Elasticsearch安装错误解决

can not run elasticsearch as root

解决方法：

别无它法只有新建个新的用户，使用该用户启动
Caused by: java.net.BindException: 无法指定被请求的地址

解决方法：

配置elasticsearch.yml，加入以下配置：
```
#配置IP为本机IP
network.host: 192.168.153.134
#或
network.host: 0.0.0.0
```
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ERROR: [4] bootstrap checks failed [1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535] [2]: max number of threads [3795] for user [es] is too low, increase to at least [4096] [3]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144] [4]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured

解决方法：

[1]错误1解决方法：

修改/etc/security/limits.conf文件，加入以下配置（记得*号别漏掉）
```
*               soft    nofile          65536
*               hard    nofile          65536
```
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查看命令
```
ulimit -Hn
ulimit -Sn
```
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[2]错误2解决方法：

修改/etc/security/limits.conff文件,加入以下配置（记得*号别漏掉）
```
*               soft    nofile          65536
*               hard    nofile          65536
```
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查看命令
```
ulimit -Hn
ulimit -Sn
```
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[3]错误3解决方法：

修改/etc/sysctl.conf文件,加入以下配置
```
vm.max_map_count=262144
```
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执行以下命令使之生效
```
sysctl -p
```
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[4]错误4解决方法：

配置elasticsearch.yml，加入以下配置，worker为主机名
```
cluster.initial_master_nodes: ["worker"]
```
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