软件下载地址：https://pan.baidu.com/s/13gX0ParcOMO_XYcdfSPlzg   提取码：9y0e

安装的时候注意jdk和elasticsearch版本问题，本次测试版本：java 14，elasticsearch 7.6.0

elasticsearch安装需要依赖java环境，所以首先配置java环境变量: http://www.jiajiajia.club/blog/artical/yjw520/21

将elasticsearch的安装包上传到linux系统，我放在了 /usr/local 文件夹下。解压

进入elasticsearch的安装目录：/usr/local/elasticsearch-7.6.0/

执行运行命令：

./bin/elasticsearch

如果报错如下：

error:
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000600000000, 8589934592, 0) failed; error='Not enough space' (errno=12)

说明你服务器的内存不够，修改配置文件：

注意（下面所有的修改配置文件均在root用户下进行）

vim ./config/jvm.options

将相应的配置修改为如下（根据自己的服务器大小来）：

-Xms512m
-Xmx512m

修改完成后再次启动报错：

uncaught exception in thread [main]
java.lang.RuntimeException: can not run elasticsearch as root
        at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:105)
        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:172)
        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:349)

这是权限问题，elasticsearch不能再root用户下启动，所以需要添加es用户，赋予相应的权限，再es用户下启动。

添加es用户，用es用户启动

useradd es
passwd es
chown -R es:es /usr/local/elasticsearch-7.6.0
su es
./bin/elasticsearch

如果没问题的话，启动成功，在另一个连接终端下执行：curl -X GET http://localhost:9200，会出现如下代码：

{
  "name" : "192.168.202.128",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "B-eVRGgOQFe7QgKgqHpQHA",
  "version" : {
    "number" : "7.6.0",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "7f634e9f44834fbc12724506cc1da681b0c3b1e3",
    "build_date" : "2020-02-06T00:09:00.449973Z",
    "build_snapshot" : false,
    "lucene_version" : "8.4.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

解决外网不可访问问题：

前提是防火墙将 9200端口放开

vim ./config/elasticsearch.yml 

末尾添加：
network.host: 0.0.0.0

修改上述配置文件后启动报错：

ERROR: [3] bootstrap checks failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]

修改

vim /etc/security/limits.conf

#添加：
* soft nofile 65536
* hard nofile 65536
#此文件修改后需要重新登录

ERROR: [2] bootstrap checks failed
[1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

修改：

vim /etc/sysctl.conf

#末尾添加：
vm.max_map_count=655360

#保存执行如下命令：
sysctl -p

ERROR: [1] bootstrap checks failed
[1]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured

修改：

vim ./config/elasticsearch.yml

追加：

cluster.initial_master_nodes: ["node-1"]

开放端口后外网访问：http://192.168.202.128:9200/

{
  "name" : "192.168.202.128",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "B-eVRGgOQFe7QgKgqHpQHA",
  "version" : {
    "number" : "7.6.0",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "7f634e9f44834fbc12724506cc1da681b0c3b1e3",
    "build_date" : "2020-02-06T00:09:00.449973Z",
    "build_snapshot" : false,
    "lucene_version" : "8.4.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}