1 ssh連線失敗

1.0 連線測試

ssh localhost

1.2 問題

ssh: connect to host localhost port 22: Connection refused

1.3 原因

未安裝ssh-server.
測試:

# 命令
ps -e | grep ssh

# 結果
1153 ?        00:00:07 ssh-agent

1.4 解決

安裝ssh-server

sudo apt-get install openssh-server

1.5 測試效果

# 命令
ps -e | grep ssh
 

# 結果
  764 ?        00:00:00 sshd
 1153 ?        00:00:07 ssh-agent

1.6 連線

# 命令
ssh localhost

# 結果
The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.
 

2 啟動hdfs失敗

2.1 啟動

./sbin/start-dfs.sh

2.2 報錯

Starting namenodes on [localhost]
Starting datanodes
Starting secondary namenodes [xhwl]
2019-01-01 12:21:04,362 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

2.3 解決

在hadoop-3.0.2/etc/hadoop/log4j.properties檔案中新增

log4j.logger.org.apache.hadoop.util.NativeCodeLoader=ERROR

3 hdfs50070埠無法訪問

3.1 原因

• Hadoop3.x版本hdfs埠為9870;
• Hadoop2.x版本hdfs埠為50070;

3.2 解決

對應Hadoop版本,啟動後訪問對應介面;

[參考文獻]
[1]https://www.linuxidc.com/Linux/2015-01/112045.htm
[2]https://blog.csdn.net/qq_36219266/article/details/81232315