centos7安装运行Elasticsearch7.1

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，参考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
#指定主节点
cluster.initial_master_nodes: ["127.0.0.1:9300"]
#发现模块
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

#更改jvm相关配置
[elk@guangzhou elasticsearch]$ vim config/jvm.options
-Xms128m
Xmx128m

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"
}

#另外如果要开放给其他机器访问，需要开放端口
[root@guangzhou bin]# firewall-cmd --zone=public --add-port=9200/tcp --permanent
success
[root@guangzhou bin]# firewall-cmd --reload