elasticsearch的启动

1. elasticsearch5.0之后不允许root用户启动，创建普通用户(ubuntu中adduser与useradd是有区别的）

adduser xiaoma

# 输入两次密码--->继续操作

2. 将elasticsearch的文件夹权限赋给该用户

chown -R xiaoma elasticsearch-7.9.3

3. 启动elasticsearch

# 1. 进入bin文件夹
cd bin

# 2. 启动(-d 是后台启动)
./elasticsearch -d

4. 查看端口是否启动

ss -lntpd|grep :9200

或者

curl localhost:9200

下面是成功启动了：

{
  "name" : "iZ2ze56sisrhp8",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "jVNOhzsoTdmBoam9",
  "version" : {
    "number" : "7.9.3",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "c4138e51121ef06a6404866cddc601",
    "build_date" : "2020-10-16T10:36:16.141335Z",
    "build_snapshot" : false,
    "lucene_version" : "8.6.2",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}