[Hadoop] Ubuntu localhost: ssh: connect to host localhost port 22: Connection refused

问题描述

hadoop@ubuntu:~/hadoop-2.8.1$ sbin/start-dfs.sh
Starting namenodes on [localhost]
localhost: ssh: connect to host localhost port 22: Connection refused
localhost: ssh: connect to host localhost port 22: Connection refused
...

检查是否安装 openssh-server

$ ps -e | grep ssh
$

apt-get

openssh-server

hadoop@ubuntu:~/hadoop-2.8.1$ sudo apt-get install openssh-server
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
openssh-server : Depends: openssh-client (= 1:7.2p2-4)
Depends: openssh-sftp-server but it is not going to be installed
Recommends: ssh-import-id but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

手动安装 openssh-client

# 手动安装下载好的deb
$ sudo dpkg -i openssh-client_7.2p2-4_amd64.deb

安装openssh-server

# 安装openssh-server
$ sudo apt-get install openssh-server

测试是否安装成功

$ ssh localhost