Hadoop config master no password login all salve

Configure master No password login all salve

1. Create Hadoop users for all nodes and set the password

Log in as root account:

Useradd Hadoop

passwd Hadoop

2, set the master node to use the Hadoop account password-free login to the machine

Log in as a Hadoop account and execute the following command:

Ssh-keygen – t RSA – P '

When asked to save the path after running, the direct carriage return takes the default path. The generated key pair: Id_rsa (private key) and id_rsa.pub (public key), which are stored by default in the "/home/hadoop/.ssh" directory.

[[email protected] ~]$ ls-~]$ CD. ssh/

3. Append the Id_rsa.pub (public key) to the authorized key

Cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

or enter the. SH directory, direct CP id_rsa.pub Authorized_keys

4. Use the root user login to modify the following contents of the SSH configuration file "/etc/ssh/sshd_config"

Check the next few lines before " # " comment is canceled:

Rsaauthentication Yes # Enable RSA authentication

Pubkeyauthentication Yes # Enable public key private key pairing authentication method

Authorizedkeysfile. Ssh/authorized_keys # Public key file path

After modifying, restart the SSH service to take effect:

Service sshd Restart

5. Test whether Hadoop users can log in directly without a password

Root first switch to Hadoop account, Su-hadooop

Then the Hadoop user executes ssh localhost

.. Yes

If you do not enter a password, the setting succeeds.

6. Use the Ssh-copy-id command to transfer the public key to the remote host

[email protected]. ssh]$ ssh [email protected]

Last login:wed Mar-23:00:05 from localhost

[Email protected] ~]$ Ssh-copy-id [email protected]

The authenticity of host ' datanode1 (192.168.1.164) ' can ' t be established.

RSA key fingerprint is 4c:d0:2c:41:ca:91:e6:d4:e6:cc:da:df:4b:24:4e:6e.

Is you sure want to continue connecting (yes/no)? Yes

warning:permanently added ' datanode1,192.168.1.164 ' (RSA) to the list of known hosts.

[email protected] ' s password:

Now try logging to the machine, with "ssh" [email protected] ' ", and check in:

. Ssh/authorized_keys

To make sure we haven ' t added extra keys so you weren ' t expecting.

[Email protected] ~]$ Ssh-copy-id [email protected]

[Email protected] ~]$ Ssh-copy-id [email protected]

7. Verification

On the master host, execute the following command to connect directly to the other server without entering the password

[Email protected]]ssh [email protected]

[Email protected]]ssh [email protected]

[Email protected]]ssh [email protected]

8. Modify the sudoers configuration file

[[Email protected]~]# vi/etc/sudoers--root Account modification, add the following two items

Hadoop all= (All) all

Hadoop all= (All) Nopasswd:all

Reference:Http://stackoverflow.com/questions/28171755/cloudera-installation-failed-to-detect-root-privileges-on-centos

Hadoop config master no password login all salve