14.9. Kerberos

GeoMesa includes initial support for HBase clusters which are authenticated using Kerberos. Currently, keytabs are supported.

Kerberos functionality should be configured by appending the following properties to hbase-site.xml:

• hbase.geomesa.keytab
• hbase.geomesa.principal

Note

All applications will require access to hbase-site.xml and core-site.xml on their classpath in order to obtain the correct configuration.

14.9.1. Long-held Connections

Occasionally Kerberos authentication can get out of sync, which can cause the HBase connection to stop working. Since HBase connections are cached, this can prevent new data store instances from being created. To prevent this, HBase connection caching can be disabled by setting the data store parameter hbase.connections.reuse to false.

14.9.2. Development & Testing

GeoMesa Kerberos support was developed against Hortonworks Data Platform 2.6 authenticating against an MIT KDC. So far, it has been tested in a limited development environment with Hortonworks Data Platform 2.6 on a single node.

Note

To use GeoMesa in a Kerberized environment add the following properties to hbase-site.xml:

<property>
     <name>hbase.geomesa.principal</name>
     <value>hbaseGeomesa/_HOST@machineName</value>
</property>

<property>
     <name>hbase.geomesa.keytab</name>
     <value>/etc/security/keytabs/hbase.geomesa.keytab</value>
</property>

14.9.3. Managing Hadoop and HBase configurations on the classpath

In order to setup the GeoMesa command line tools, create symlinks of the Hadoop configuration files to $GEOMESA_HOME/conf/. Here is an example command to help do this:

$ for i in $(ls /usr/hdp/current/hadoop-client/conf); do ln -s /usr/hdp/current/hadoop-client/conf/$i $GEOMESA_HOME/conf/; done $ ln -s /usr/hdp/current/hbase-client/conf/hbase-site.xml $GEOMESA_HOME/conf/

You can verify that the GeoMesa HBase command line tools are working by ingest a small sample file.

For GeoServer, similarly, the above configuration files will need to copied or symlinked to geoserver/WEB-INF/classes/.

14.9.4. Enabling Kerberos on HDP

To enable kerberos on a HDP cluster you can either

• do it all manually (not recommended)
• use ambari as outlined in https://docs.hortonworks.com/HDPDocuments/Ambari-2.2.0.0/bk_Ambari_Security_Guide/content/ch_configuring_amb_hdp_for_kerberos.html
• or deploy a kerberos enabled Ambari blueprint https://cwiki.apache.org/confluence/display/AMBARI/Blueprints like

{
  [
    {
      "kerberos-env": {
        "properties_attributes" : { },
        "properties" : {
          "realm" : "myOrg.com",
          "kdc_type" : "mit-kdc",
          "kdc_hosts" : "kdc.company.com",
          "admin_server_host" : "kdx.company.com"
        }
      }
    },
    {
      "krb5-conf": {
        "properties_attributes" : { },
        "properties" : {
          "domains" : "",
          "manage_krb5_conf" : "false"
        }
      }
    },
  ],
  "host_groups" : [
    {
      "name" : "host_group_1",
      "configurations" : [ ],
      "default_password": "hadoop",
      "components" : [
        { "name" : "INFRA_SOLR"             , "provision_action" : "INSTALL_AND_START" },
        ......
        { "name" : "ZOOKEEPER_CLIENT"       , "provision_action" : "INSTALL_AND_START" }
      ],
      "cardinality" : "1"
    }
  ],
  "Blueprints" : {
    "blueprint_name" : "hdp-2.6-sandbox",
    "stack_name" : "HDP",
    "stack_version" : "2.6",
    "security" : {
      "type" : "KERBEROS"
    }
  }
}