Ubuntu 14.10 under SSH configuration

SSH is required when installing Hadoop, so record this process

It is recommended to install OpenSSH, and Hadoop needs to start the daemon of each host in the Slave list via ssh, so ssh is required to be installed. Although we are now building a pseudo-distributed platform, but Hadoop does not have a separate cluster and pseudo-distributed, for Pseudo-distributed, Hadoop will be the same as the cluster processing, that is, in order to start the file conf/slaves recorded in the host process, but in the pseudo-distributed Salve is localhost only, so for pseudo-distributed, SSH is required.

1 Install SSH, if installed on the machine, skip to see if SSH is installed

Ps-e | grep SSH

If you do not see SSH, the instructions are not installed and need to be installed

sudo  apt-get install Openssh-server

Installation complete, start, stop, restart command as follows

Sudo/etc/init.d/ssh start

Sudo/etc/init.d/ssh stop

Sudo/etc/init.d/ssh restart

2 Configuring password-free logon native

Switch to root user

sudo su

　　In the home directory, execute the following command: ssh-keygen-t RSA

Generating public/private RSA key pair.Enter file in which to save the key (/HOME/LIUCC/.SSH/ID_RSA):Enter Passphrase (empty for NoPassphrase):Enter same Passphrase again:Your identification have been saved in/home/liucc/.ssh/id_rsa.Your Public key have been saved in/home/liucc/.ssh/id_rsa.pub.The key fingerprint is:2f: aa: -: to: the: *: a6:5c:b3:e9:fc:b3:d0:0d: -: C8 LIUCC@ubuntuThe key's Randomart image is:+--[RSA 2048]----+| o* | |  . o= * | | O.E.        .  ||   . o O | | . O.    S | |       . o O.   || ..      + O.  || . ..       + .   || O.. o |+-----------------+

After this command is completed, the ID_DSA and id_dsa.pub two files are created under the. SSH folder under the current folder, which is a pair of SSH private keys and public keys, append the id_dsa.pub (public key) to the authorized key, and enter the following command if there is no Id_r found Sa.pub error, need to enter into the. SSH directory below

Cat id_rsa.pub > Authorized_keys

Input command test

Ssh  

Ubuntu 14.10 under SSH configuration