Verifying Which Ports Are Listening 

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nmap -sT -O localhost
netstat -tuplen

Troubleshooting:

This output shows the system is running portmap due to the presence of the sunrpc service. However, there is also a mystery service on port 834. To check if the port is associated with the official list of known services, type:

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cat /etc/services | grep 834

===>

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netstat -anp | grep 834

The command returns the following output:

tcp   0    0 0.0.0.0:834    0.0.0.0:*   LISTEN   653/ypbind

===>

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lsof -i | grep 834
tech

tag:

    缺失模块。
    1、在博客根目录（注意不是yilia根目录）执行以下命令：
    npm i hexo-generator-json-content --save

    2、在根目录_config.yml里添加配置： 

      jsonContent:
    meta: false
    pages: false
    posts:
      title: true
      date: true
      path: true
      text: true
      raw: false
      content: false
      slug: false
      updated: false
      comments: false
      link: false
      permalink: false
      excerpt: false
      categories: false
      tags: true

Hello, I'm Fouding based in Xiamen, China. <br>This is my blog about life, career and technologies.