Question

我在 VirtualBox 上安装了 Hadoop-2.7.3 。

当我在终端中输入命令./start-all.sh时，Namenode，Secondary Namenode＆amp; Datanode没有开始。以下是错误截图。请为此问题提出一些解决方案。

我的终端窗口出现错误。

sreenu@MyPC:~/hdfs/sbin$ ./start-all.sh

This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh
17/07/24 16:38:12 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

Starting namenodes on [localhost]
localhost: ssh: connect to host localhost port 22: Connection refused
localhost: ssh: connect to host localhost port 22: Connection refused

Starting secondary namenodes [0.0.0.0]
0.0.0.0: ssh: connect to host 0.0.0.0 port 22: Connection refused

17/07/24 16:38:19 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

starting yarn daemons
resourcemanager running as process 2899. Stop it first.

localhost: ssh: connect to host localhost port 22: Connection refused

sreenu@MyPC:~/hdfs/sbin$ jps
3536 Jps
2899 ResourceManager
3175 JobHistoryServer

sreenu@MyPC:~/hdfs/sbin$

the manual

Answer 1

通过卸载并重新安装openssh-server和openssh-client，我的机器上解决了这个问题。

命令：

sudo apt-get remove openssh-server openssh-client

sudo apt-get install openssh-server openssh-client

关闭终端，重新启动VirtualBox并尝试再次启动所有守护程序。

Answer 2

安装ssh后，需要实际启动ssh服务器。您设置的问题在于您的 ssh 服务器没有运行。要验证此问题，请运行：

$ ssh localhost

如果您遇到相同的错误，即 localhost: ssh: connect to host localhost port 22: Connection refused，请使用以下命令启动 ssh 服务：

$ /etc/init.d/ssh start

如果 ssh localhost 没有出现任何错误，则可能是其他问题。

无法启动Namenode，Secondary Namenode＆amp;某个Datanode

2 个答案: