基于elasticsearch6.5.1安装head插件
1.因为head是一个用于管理Elasticsearch的web前端插件，该插件在es5版本以后采用独立服务的形式进行安装使用（之前的版本可以直接在es安装目录中直接安装），因为需要安装nodejs、npm。所有的机器都要有同样的配置步骤。
sudo yum -y install nodejs结果如下：
2.下载yum源
参考来源：http://www.cnblogs.com/fps2tao/p/9956139.html
sudo rpm -ivh https://dl.fedoraproject.org/pub/epel/7/x86_64/Packages/e/epel-release-7-11.noarch.rpm结果：
3.更新node.js的yum源，这里选择8.x。注意：此处需要切换为root 用户，sudo也不行。非root用户会报错。
curl --silent --location https://rpm.nodesource.com/setup_8.x | bash -非root用户报错：
4.yum安装node.js
sudo yum install -y nodejs5.查看Node.js和npm版本
node -v
npm -v结果：
6.下载elasticsearch-head
https://github.com/mobz/elasticsearch-head
7.解压后，在该目录下执行
npm install结果报错：
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] install: `node install.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! /root/.npm/_logs/2018-12-07T01_27_30_244Z-debug.log
[zuowei.zhang@master elasticsearch-head]$
[zuowei.zhang@master elasticsearch-head]$ npm install [email protected]
npm ERR! code ETARGET
npm ERR! notarget No matching version found for [email protected]
npm ERR! notarget In most cases you or one of your dependencies are requesting
npm ERR! notarget a package version that doesn't exist.
npm ERR! A complete log of this run can be found in:
npm ERR! /home/zuowei.zhang/.npm/_logs/2018-12-07T01_29_33_475Z-debug.log
对于此错误，参考https://blog.csdn.net/z1035075390/article/details/73247412的做法：
npm install [email protected] --ignore-scripts没有报错后，再次执行npm install
[zuowei.zhang@master elasticsearch-head]$ npm install
npm WARN [email protected] license should be a valid SPDX license expression
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
added 8 packages from 13 contributors and audited 1853 packages in 10.341s
found 23 vulnerabilities (17 low, 6 high)
run `npm audit fix` to fix them, or `npm audit` for details8.解决第一个warn：npm WARN [email protected] license should be a valid SPDX license expression
参考https://www.cnblogs.com/shengulong/p/6224908.html的解决办法，
9.剩下的两个WARN，参考https://blog.csdn.net/aerchi/article/details/54582891的解释，忽略即可。
10.run `npm audit fix` to fix them, or `npm audit` for details
参考提示，执行。
11.修改elasticsearch.yml，在末尾添加
http.cors.enabled: true
http.cors.allow-origin: "*"12.修改elasticsearch-head目录下的Gruntfile.js。修改服务监听地址（增加hostname属性，将其值设置为*）
13.修改elasticsearch-head/_site目录下的app.js
14.在elasticsearch-head目录下执行：
npm run start结果：
15.查看端口：
