Access web by console application

Available in VPC

You can manage Cloud Hadoop cluster's information and status using the web UIs provided by NAVER Cloud Platform's Cloud Hadoop (such as Ambari and Hue).

Preliminary task

In order to access a cluster node, the following preparations need to be made in advance:

1. Set SSL VPN

SSL VPN must be set to ensure secure access from outside to the network configured within NAVER Cloud Platform.
For more information on SSL VPN settings, see Set SSL VPN.

2. Set ACG rules

To change the ACG rules of a cluster:

1. In the VPC environment of the NAVER Cloud Platform console, navigate to > Services > Compute > Server > ACG in order.
2. Select the ACG of the cluster you want to access and click the [ACG settings] button.
   
3. Enter the following four information items and add ACG Rule:
   • Protocol: TCP
   • Access source: IP of the local device used for SSH communication.
   • Allowed port: 8443 for Ambari, and 8421 for HDFS NameNode.
   • Note (optional)
     

Access Web UI

You can access each web UI using DNS.

To access the available web UIs:

1. In the VPC environment of the NAVER Cloud Platform console, navigate to > Services > Big Data & Analytics > Cloud Hadoop in order.
2. Select the cluster to access the web UI from the cluster list, and then click the [View by application] button.
3. Click the web UI link in the note field from the popup window's web UI list.
4. Go to the NCloud login authentication page and access the web UI with NCloud account login.
   

Access through Private IP

Access can be made using the private IP of each node with SSL VPN turned on. Click the Quick Links from each Ambari UI menu and FQDN will be used instead of the host's private IP. Replace FQDN with private IP and access.

Change password

Ambari

To set and change the Ambari UI access password, navigate to [Manage cluster] > Initialize cluster admin password on the Cloud Hadoop console.
For more information, see Initialize cluster admin password.

Hue

Hue does not sync with LDAP automatically. In a Secure Hadoop environment, when you create Hue for the first time, you must sync LDAP accounts through the Hue UI.

To sync LDAP accounts:

1. Change the login type from LDAP to Local.
   
2. Click [Manage Users].
   
3. Click [Sync LDAP users/groups] to start synchronization.
   

Change password

To change the password for accessing the HUE UI:

1. Run PuTTY and access the edge node through SSH. For more information, see the Access cluster node through SSH guide.
2. Change a password by running the appropriate commands depending on the account type (LOCAL vs. LDAP):

• LOCAL account

  $ cd /usr/hdp/3.1.0.0-78/hue/build/env/bin  # Cloud Hadoop 1.x
  $ cd /usr/nch/3.1.0.0-78/hue/build/env/bin  # Cloud Hadoop 2.x
  
  $ pwd
  
  $ sudo -s   # root
  
  $ echo "from django.contrib.auth.models import User; 
  u = User.objects.get(username='existing user name');
  u.set_password('new password');
  u.save()
  " | ./hue shell
  

  Or, change the password using the hue changepassword command as follows:

  $ cd /usr/hdp/3.1.0.0-78/hue/build/env/bin  # Cloud Hadoop 1.x
  $ cd /usr/nch/3.1.0.0-78/hue/build/env/bin  # Cloud Hadoop 2.x
  
  $ sudo ./hue changepassword 'existing user name'
  Changing password for user 'existing user name'
  Password:
  Password (again):
  Password changed successfully for user 'existing user name'      
  

• LDAP account

  • Use ldapmodify command to change the password.

    ldif=/tmp/modify-account.ldif
    HASH_USER_PW=$(slappasswd -h "{SSHA}" -s "new_password")
    
    cat <<EOF | tee $ldif
    dn: uid=account name,ou=users,dc=USER,dc=GUIDE
    changetype: modify
    replace: userPassword
    userPassword: ${HASH_USER_PW}
    EOF
    
    ldapmodify \
      -H ldap://localhost:389 \
      -D "cn=root,dc=USER,dc=GUIDE" \
      -w "Kerberos_password" \
      -f "$ldif"
    

Zeppelin Notebook

In Cloud Hadoop, Zeppelin Notebooks are managed by Ambari.
Therefore, it is recommended to access the Ambari UI and perform tasks rather than directly accessing the cluster to change files and run scripts.

To change your Zeppelin Notebook password:

1. After accessing the Ambari UI, log in with the cluster admin account ID and password.
2. Click Zeppelin Notebook from the left-side bar.
3. Click the [CONFIGS] tap at the top.
4. Click the Advanced-zeppelin-shiro-ini item, and edit the password.
   
5. Click the [Save] button at the bottom right corner.
6. Click [Actions] > Restart All at the upper right, and click [Confirm Restart All] in the popup window.

If you follow the above sequence and access Zeppelin Notebook, you will see that the password change has been applied.