Elasticsearch是个开源分布式搜索引擎，它的特点有：开源、灵活性、分布式，零配置，自动发现，索引自动分片，索引副本机制，restful风格接口，多数据源，自动搜索负载等。
Elasticsearch是基于java开发的，先安装java8运行环境，本机已经安装好，centos7下安装Java8运行环境。
[root@guangzhou src]# wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.1.1-linux-x86_64.tar.gz [root@guangzhou src]# mv elasticsearch-7.1.1 elasticsearch && mv elasticsearch /usr/local/elasticsearch [root@guangzhou src]# cd /usr/local/elasticsearch #编辑配置信息 [root@guangzhou elasticsearch]# vim config/elasticsearch.yml #单机模式，取消注释 node.name: node-1 #数据存储路径 path.data: /usr/local/elasticsearch/data #日志存放路径 path.logs: /usr/local/elasticsearch/logs #还不清楚是什么用 discovery.seed_hosts: ["127.0.0.1", "[::1]"] #取消IP限制 network.host: 0.0.0.0 #访问端口 http.port: 9200
启动es
[root@guangzhou bin]# ./elasticsearch [2020-02-07T16:08:40,816][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [node-1] uncaught exception in thread [main] org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:163) ~[elasticsearch-7.1.1.jar:7.1.1] at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) ~[elasticsearch-7.1.1.jar:7.1.1] at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-7.1.1.jar:7.1.1] at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-7.1.1.jar:7.1.1] at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-7.1.1.jar:7.1.1] at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:115) ~[elasticsearch-7.1.1.jar:7.1.1] at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-7.1.1.jar:7.1.1] Caused by: java.lang.RuntimeException: can not run elasticsearch as root at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:102) ~[elasticsearch-7.1.1.jar:7.1.1] at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:169) ~[elasticsearch-7.1.1.jar:7.1.1] at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:325) ~[elasticsearch-7.1.1.jar:7.1.1] at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159) ~[elasticsearch-7.1.1.jar:7.1.1] ... 6 more #错误显示的不能以root运行elasticsearh，考虑到后面会搭建elk，新建用户名elk来运行elasticsearch [root@guangzhou bin]# groupadd elk [root@guangzhou bin]# useradd -g elk elk [root@guangzhou bin]# chown -R elk:elk /usr/local/elasticsearch/ #再次运行 [root@guangzhou bin]# su elk [elk@guangzhou bin]$ ./elasticsearch ... #新开窗口输入以下命令看结果知道启动成功 [root@guangzhou bin]# curl http://127.0.0.1:9200 { "name" : "node-1", "cluster_name" : "elasticsearch", "cluster_uuid" : "_na_", "version" : { "number" : "7.1.1", "build_flavor" : "default", "build_type" : "tar", "build_hash" : "7a013de", "build_date" : "2019-05-23T14:04:00.380842Z", "build_snapshot" : false, "lucene_version" : "8.0.0", "minimum_wire_compatibility_version" : "6.8.0", "minimum_index_compatibility_version" : "6.0.0-beta1" }, "tagline" : "You Know, for Search" }
另外观察到elasticsearch启动后，内存占用达到1.4G，停掉elasticsearch后内存直接降到200M，看来这个东东吃内存真的挺严重，毕竟是用java开发的。
原文：https://www.cnblogs.com/wscsq789/p/12272271.html