how to setup #kerberos in #emr

 To set up Kerberos in Amazon Elastic MapReduce (EMR), you need to follow these steps:

1. Create a Kerberos realm: You can use an existing Kerberos realm or create a new one. A Kerberos realm is a collection of Kerberos principals and services that share a common security policy.

2. Create a KDC (Key Distribution Center): The KDC is the server that issues and manages Kerberos tickets. You can use an existing KDC or create a new one.

3. Set up the EMR cluster to use Kerberos: You need to enable Kerberos authentication for the EMR cluster. This can be done by specifying the Kerberos realm, KDC hostname, and other Kerberos-related configuration parameters when creating the EMR cluster.

4. Configure EMR applications to use Kerberos: You need to configure the applications running on the EMR cluster to use Kerberos authentication. This can be done by specifying the appropriate configuration settings for each application.

5. Test the Kerberos setup: Once you have configured Kerberos for EMR, you should test the setup to ensure that it is working correctly. You can do this by running sample jobs that use Kerberos authentication.

The exact steps for setting up Kerberos in EMR will depend on your specific requirements and environment. Amazon provides detailed documentation on how to set up Kerberos in EMR, which you can refer to for more information.

how to add #proxy user in #oozie or #hue

 To add a proxy user in Oozie or Hue, you will need to update the configuration files for these tools.

Here are the steps to add a proxy user in Oozie:

1.       Open the core-site.xml file, which is located in the Hadoop configuration directory. This directory is typically located at /etc/hadoop/conf/.

2.       Add the following configuration property to the file, replacing proxyuser with the username of the user you want to act as a proxy:

<property>

  <name>hadoop.proxyuser.proxyuser.hosts</name>

  <value>*</value>

</property>

 

3.       Add the following configuration property to the file, replacing proxyuser with the username of the user you want to act as a proxy, and user with the username of the user you want to allow to use the proxy:

 

<property>

  <name>hadoop.proxyuser.proxyuser.groups</name>

  <value>user</value>

</property>

 

4.       Save and close the configuration file.

5.       Restart the Oozie server to apply the changes.

 

Here are the steps to add a proxy user in Hue:

 

1.       Open the hue.ini configuration file, located in the Hue configuration directory. This directory is typically located at /etc/hue/conf/.

2.       Find the [desktop] section in the configuration file, and add the following setting:

 

[desktop].

proxy_username=proxyuser

 

3.       Save and close the configuration file.

4.       Restart the Hue server to apply the changes.

 

Note that adding a proxy user allows a specific user to act on behalf of another user. This can be a security risk, so it is important to carefully consider which users are allowed to act as proxies and which users are allowed to use proxies.

how to integrate #ldap with #emr

 To integrate LDAP with Amazon EMR (Elastic MapReduce), follow these steps:

1.       Create an LDAP directory service in AWS. You can use Amazon Managed AD or Simple AD to create a directory service.

2.       Create an IAM role for EMR to access the LDAP directory. You will need to create a policy that grants the EMR service access to the LDAP directory. Here's an example policy that you can use:

{

                "Version": "2012-10-17",

                "Statement": [{

                                "Effect": "Allow",

                                "Action": [

                                                "ds:DescribeDirectories",

                                                "ds:CreateComputer",

                                                "ds:DeleteComputer",

                                                "ds:DescribeComputers",

                                                "ds:JoinDirectory"

                                ],

                                "Resource": "*"

                }]

}

 

3.       Launch an EMR cluster and configure it to use the IAM role that you created in step 2.

4.       Configure the EMR cluster to join the LDAP directory. You can do this by adding the following configuration to the EMR cluster:

[{

                "Classification": "directory-service",

                "Properties": {

                                "directory_service_name": "<directory_service_name>",

                                "directory_service_password": "<directory_service_password>",

                                "directory_service_username": "<directory_service_username>",

                                "directory_service_domain_name": "<directory_service_domain_name>",

                                "directory_service_dns_ips": "<directory_service_dns_ips>"

                },

                "Configurations": []

}]

 

Replace the following variables with your own values:

 

<directory_service_name>: the name of the LDAP directory service that you created in step 1.

<directory_service_password>: the password for the user that you want to use to join the EMR cluster to the LDAP directory.

<directory_service_username>: the username for the user that you want to use to join the EMR cluster to the LDAP directory.

<directory_service_domain_name>: the domain name of the LDAP directory.

<directory_service_dns_ips>: the IP addresses of the DNS servers for the LDAP directory.

 

Start the EMR cluster.

 

Once the EMR cluster is running, you should be able to authenticate users against the LDAP directory. You can test this by SSHing into the EMR cluster and running an LDAP search using the ldapsearch command.