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FILE_SYSTEM_LEARING.md

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HDFS开源文件系统学习

HDFS是由java语言开发的，应用也很广泛。官方中文文档

  1. 开源主流分布式文件系统简单介绍参考地址

  2. centos7 配置单机 HDFS参考地址

centos7 中删除openjdk包，安装jdk

  1. rpm -qa | grep java //查看安装的java包
  2. 删除安装的jdk包
rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.252.b09-2.el7_8.x86_64
pm -e --nodeps java-1.8.0-openjdk-1.8.0.252.b09-2.el7_8.x86_64

HFDS启动报错： ERROR: but there is no YARN_RESOURCEMANAGER_USER defined. Aborting operation.

处理参考地址

启动Hadoop时候datanode没有启动的原因及解决方案

参考地址

查询了半天启动不了NameNode服务，各种修改，运行下面一个命令就可以了，干。。。

注意： 我直接用 $HADOOP_HOME/sbin/start-dfs.sh没有启动所有是因为没有弄公私钥。所以本地不能ssh，处理可以看官方文档：描述如下

If you cannot ssh to localhost without a passphrase, execute the following commands:

  $ ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
  $ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
  $ chmod 0600 ~/.ssh/authorized_keys

https://blog.csdn.net/nenguou04/article/details/88770031

[Unit] Description=nginx - high performance web server Documentation=http://nginx.org/en/docs/ After=network.target remote-fs.target nss-lookup.target

[Service] Type=forking PIDFile=/your nginx pid file path/nginx.pid ExecStartPre=/usr/local/nginx/sbin/nginx -t -c /usr/local/nginx/conf/nginx.conf ExecStart=/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf ExecReload=/bin/kill -s HUP $MAINPID ExecStop=/bin/kill -s QUIT $MAINPID PrivateTmp=true

[Install] WantedBy=multi-user.target