Hadoop on Windows with Eclipse -04- Setup SSH daemon
Setup SSH daemon Both Hadoop scripts and Eclipse plug-in need password-less SSH to operate. This section describes how to set it up in the Cygwin environment. Configure ssh daemon Open the Cygwin command prompt. Execute the following command: ssh-host-config When asked if privilege separation should be used, answerno. When asked if sshd should be installed as a service, answeryes. When asked about the value of CYGWIN environment variable, enterntsec. Here is an example session of this command. Note that the input typed by the user is shown in pink and output from the system is shown in gray. Example of using ssh-host-config Start SSH daemon here FindMy Computericon either on your desktop or in the start-up menu, right-click on it and selectManagefrom the context menu. OpenServices and Applicationsin the left-hand panel then select theServicesitem. Find theCYGWIN sshditem in the main section and right-click on it. SelectStartfrom the context menu. Start SSHD service A small window should pop-up indicating the progress of the service start-up. After that window disappears the status of CYGWIN sshd service should change toStarted. Setup authorization keys Eclipse plug-in and Hadoop scripts require ssh authentication to be performed through authorization keys rather than passwords. The following steps describe how authorization keys are set up. here Open cygwin command prompt Execute the following command to generate keys ssh-keygen When prompted for filenames and pass phrases press ENTER to accept default values. After the command has finished generating keys, enter the following command to change into your .ssh directory: cd ~/.ssh Check if the keys were indeed generated by executing the following command: ls -l You should see two filesid_rsa.pubandid_rsawith recent creation dates.These files contain authorization keys. To register the new authorization keys enter the following command (note the sharply-angled double brackets -- they are very important): cat id_rsa.pub >> authorized_keys Setting up authorization keys Now check if the keys were set up correctly by executing the following command: ssh localhost Since it is a new ssh installation, you will be warned that authenticity of the host could not be established and will be asked whether you really want to connect. Answeryesand press ENTER. You should see the Cygwin prompt again, which means that you have successfully connected. Now execute the command again: ssh localhost This time you should not be prompted for anything.
