Hadoop: connect to host localhost port 22: Connection refused when running start-dfs.sh
Install openssh server.
For Ubuntu command is :
sudo apt-get install openssh-serverIn hadoop-env.sh file ( present in /etc/hadoop) add the following line :
export HADOOP_SSH_OPTS="-p 22"
Configure "HADOOP_SSH_OPTS" in your hadoop-env.sh, to add any SSH CLI options you need to always be present when the Hadoop scripts use SSH. A line like 'export HADOOP_SSH_OPTS="-p "' perhaps would be what you are looking for.
Source: Interweb
Install and start openssh server. Here is the command for CentOS:
Install Open SSH server:
sudo yum -y install openssh-server openssh-clientsStart SSH server:
sudo service sshd start