本教程讨论如何在 CentOS 7 上安装ElasticSearch 7.x。Elasticsearch 是一个开源的搜索和分析引擎，允许您实时存储、搜索和分析大量数据。ElasticSearch 为依赖密集型搜索操作（如电子商务平台和大数据应用程序）的数百万应用程序提供支持。
截至本文更新时，ElasticSearch 的最新版本为 7。我们将介绍在 CentOS 7 Linux 系统上安装 ElasticSearch 7 所需的最低步骤。让我们开始吧。
第 1 步：更新 CentOS 7 Linux
sudo yum -y update
sudo reboot
第 2 步：在 CentOS 7 上安装 Java
ElasticSearch 需要安装 Java 才能运行。在 CentOS 7 上可安装的默认 Java 是 Java 8。下面是用于安装的命令。
sudo yum -y install java-1.8.0-openjdk java-1.8.0-openjdk-devel
Set Java home(下面整段复制执行)
cat <<EOF | sudo tee /etc/profile.d/java8.sh
export JAVA_HOME=/usr/lib/jvm/jre-openjdk
export PATH=\$PATH:\$JAVA_HOME/bin
export CLASSPATH=.:\$JAVA_HOME/jre/lib:\$JAVA_HOME/lib:\$JAVA_HOME/lib/tools.jar
EOF
Source created file to update your environment.
source /etc/profile.d/java8.sh
Step 3: 填 ElasticSearch Yum 库
将用于下载ElasticSearch 7 yum包的存储库添加到 CentOS 7 系统。(下面整段复制执行)
cat <<EOF | sudo tee /etc/yum.repos.d/elasticsearch.repo
[elasticsearch-7.x]
name=Elasticsearch repository for 7.x packages
baseurl=https://artifacts.elastic.co/packages/oss-7.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md
EOF
如果要安装 Elasticsearch 6，请将7的所有匹配项替换为6。添加存储库后，清除并更新 YUM 包索引。
sudo yum clean all
sudo yum makecache
第 4 步：在 CentOS 7 上安装ElasticSearch 7
最后在 CentOS 7 计算机上安装ElasticSearch 7.x。请注意，我们添加了一个开源存储库。也可以使用其他商业存储库。
sudo yum -y install elasticsearch-oss
确认在 CentOS 7 上安装ElasticSearch 7：
$ rpm -qi elasticsearch-oss
Name : elasticsearch-oss
Epoch : 0
Version : 7.4.0
Release : 1
Architecture: x86_64
Install Date: Thu 17 Oct 2019 05:10:43 AM UTC
Group : Application/Internet
Size : 395896718
License : ASL 2.0
Signature : RSA/SHA512, Fri 27 Sep 2019 10:40:01 AM UTC, Key ID d27d666cd88e42b4
Source RPM : elasticsearch-oss-7.4.0-1-src.rpm
Build Date : Fri 27 Sep 2019 08:49:06 AM UTC
Build Host : packer-virtualbox-iso-1559162487
Relocations : /usr
Packager : Elasticsearch
Vendor : Elasticsearch
URL : https://www.elastic.co/
Summary : Distributed RESTful search engine built for the cloud
Description :
Reference documentation can be found at
https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html
and the 'Elasticsearch: The Definitive Guide' book can be found at
https://www.elastic.co/guide/en/elasticsearch/guide/current/index.html
配置 Java 内存限制
您可以通过编辑文件来设置 JVM 选项（如内存限制）： /etc/elasticsearch/jvm.options
下面的示例设置总堆空间的初始/最大值
$ sudo vi /etc/elasticsearch/jvm.options
.....
-Xms1g
-Xmx1g
如果系统内存较少，则可以将其配置为使用小兆字节的内存。
-Xms256m
-Xmx512m
开机自动启动 Elasticsearch服务：
sudo systemctl enable --now elasticsearch
确认服务正在运行。
$ sudo systemctl status elasticsearch
● elasticsearch.service - Elasticsearch
Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2019-10-17 05:16:00 UTC; 13s ago
Docs: [http://www.elastic.co](http://www.elastic.co/)
Main PID: 8774 (java)
CGroup: /system.slice/elasticsearch.service
└─8774 /usr/share/elasticsearch/jdk/bin/java -Xms1g -Xmx1g -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSI...
Oct 17 05:15:46 cent7.novalocal systemd[1]: Starting Elasticsearch...
Oct 17 05:15:46 cent7.novalocal elasticsearch[8774]: OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in versio...elease.
Oct 17 05:16:00 cent7.novalocal systemd[1]: Started Elasticsearch.
Hint: Some lines were ellipsized, use -l to show in full.
检查是否可以连接到Elasticsearch服务
$ curl http://127.0.0.1:9200
{
"name" : "cent7.novalocal",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "SmGu9eXJRlGzxqEy2brGXQ",
"version" : {
"number" : "7.4.0",
"build_flavor" : "oss",
"build_type" : "rpm",
"build_hash" : "22e1767283e61a198cb4db791ea66e3f11ab9910",
"build_date" : "2019-09-27T08:36:48.569419Z",
"build_snapshot" : false,
"lucene_version" : "8.2.0",
"minimum_wire_compatibility_version" : "6.8.0",
"minimum_index_compatibility_version" : "6.0.0-beta1"
},
"tagline" : "You Know, for Search"
}
第 5 步：在 CentOS 7 上安装 Kibana
相关的Elasticsearch包，如Kibana，Logstash 等都可以从添加的存储库中安装。.
sudo yum install kibana-oss
成功安装后，配置 Kibana:
$ sudo vi /etc/kibana/kibana.yml
server.host: "0.0.0.0"
server.name: "http://kibana.example.com"
elasticsearch.host: ["http://localhost:9200"]
设置随系统启动 kibana 服务:
sudo systemctl enable --now kibana
如果您有活动防火墙，则需要允许访问 Kibana 端口：
sudo firewall-cmd --add-port=5601/tcp --permanent
sudo firewall-cmd --reload
访问打开kibana仪表板http://ip-address:5601
image
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