linux centos7安装elasticsearch

慢慢写，慢慢加油

下载es连接更改配置文件启动es

创建es组，并把elasticsearch-7.16.3文件夹加入如权限 参考资料

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.16.3-linux-x86_64.tar.gz
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.16.3-linux-x86_64.tar.gz.sha512
shasum -a 512 -c elasticsearch-7.16.3-linux-x86_64.tar.gz.sha512 
tar -xzf elasticsearch-7.16.3-linux-x86_64.tar.gz

如果shasum命令找不到，请下载，

yum install perl-Digest-SHA

es目录里的config里的jvm.options

-Xms256m
-Xmx256m

当启动es的bin里的

会报错

java.lang.RuntimeException: can not run elasticsearch as root
	at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:107)
	at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:183)

elasticsearch不能在root下执行
因此

[root@localhost bin]# groupadd es
[root@localhost bin]# useradd es -g es
[root@localhost bin]# passwd es
[root@localhost bin]# chown -R es:es elasticsearch-7.16.3

切换es用户，到es的bin目录，进行启动

[root@localhost bin]# su es
[root@localhost bin]# ./elasticsearch

可启动成功了，访问

curl localhost:9200

[root@localhost ~]# curl localhost:9200
{
  "name" : "localhost.localdomain",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "vndxxZbCSIO58HZw8K3P1Q",
  "version" : {
    "number" : "7.16.3",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "4e6e4eab2297e949ec994e688dad46290d018022",
    "build_date" : "2022-01-06T23:43:02.825887787Z",
    "build_snapshot" : false,
    "lucene_version" : "8.10.1",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

centos 解决 -bash: shasum: command not found
elasticsearch之can not run elasticsearch as root