In Cloudera Manager, the Add Service wizard lets you automatically configure and test the connection of an external Hue database. See Adding the Hue Service.

For information about installing and configuring a MariaDB database , see MariaDB Database.

  Note: Cloudera recommends InnoDB over MyISAM as the Hue MySQL engine. On CDH 5, Hue requires InnoDB.

For information about installing and configuring a MySQL database , see MySQL Database.

For information about installing and configuring an external PostgreSQL database , see External PostgreSQL Database.

1. In the Cloudera Manager Admin Console, go to the Hue service status page.
2. Select Actions > Stop. Confirm you want to stop the service by clicking Stop.
3. Select Actions > Dump Database. Confirm you want to dump the database by clicking Dump Database.
4. Note the host to which the dump was written under Step in the Dump Database Command window. You can also find it by selecting Commands > Recent Commands > Dump Database.
5. Open a terminal window for the host and go to the dump file in /tmp/hue_database_dump.json.
6. Remove all JSON objects with useradmin.userprofile in the model field, for example:

   {
   "pk": 14,
   "model": "useradmin.userprofile",
   "fields":
   { "creation_method": "EXTERNAL", "user": 14, "home_directory": "/user/tuser2" }
   },

7. Install the PostgreSQL server.

   RHEL

   $ sudo yum install postgresql-server

   SLES

   $ sudo zypper install postgresql-server

   Ubuntu or Debian

   $ sudo apt-get install postgresql

8. Initialize the data directories.

   $ service postgresql initdb

9. Configure client authentication.
   1. Edit /var/lib/pgsql/data/pg_hba.conf.
   2. Set the authentication methods for local to trust and for host to password and add the following line at the end.

      host     hue     hue     0.0.0.0/0       md5

10. Start the PostgreSQL server.

    $ su - postgres
    # /usr/bin/postgres -D /var/lib/pgsql/data > logfile 2>&1 &
    # exit

11. Configure PostgreSQL to listen on all network interfaces.
    1. Edit /var/lib/pgsql/data/postgresql.conf and set list_addresses.

       listen_addresses = ‘0.0.0.0’     # Listen on all addresses

12. Create the hue database and grant privileges to a hue user to manage the database.

    # psql -U postgres
    postgres=# create database hue;
    postgres=# \c hue;
    You are now connected to database 'hue'.
    postgres=# create user hue with password 'secretpassword';
    postgres=# grant all privileges on database hue to hue;
    postgres=# \q

13. Restart the PostgreSQL server.

    $ sudo service postgresql restart

14. Verify connectivity.

    su - postgres
    # psql –h localhost –U hue –d hue 
    Password for user hue: secretpassword
    hue=> \q
    exit

15. Configure the PostgreSQL server to start at boot.

    RHEL

    $ sudo /sbin/chkconfig postgresql on
    $ sudo /sbin/chkconfig --list postgresql
    postgresql          0:off   1:off   2:on    3:on    4:on    5:on    6:off

    SLES

    $ sudo chkconfig --add postgresql

    Ubuntu or Debian

    $ sudo chkconfig postgresql on

16. Configure the Hue database:
    1. In the Cloudera Manager Admin Console, click the HUE service.
    2. Click the Configuration tab.
    3. Select Scope > Hue Server.
    4. Select Category > Advanced.
    5. Set Hue Server Advanced Configuration Snippet (Safety Valve) for hue_safety_valve_server.ini with the following:

       [desktop]
       [[database]]
       engine=postgresql_psycopg2
       name=hue
       host=localhost
       port=5432
       user=hue
       password=secretpassword

         Note: If you set Hue Database Hostname, Hue Database Port, Hue Database Username, and Hue Database Password at the service-level, under Service-Wide > Database, you can omit those properties from the server-lever configuration above and avoid storing the Hue password as plain text. In either case, set engine and name in the server-level safety-valve.
    6. Click Save Changes.
17. Optionally restore the Hue data to the new database:
    1. Select Actions > Synchronize Database.
    2. Determine the foreign key ID.

       bash# su – postgres
       $ psql –h localhost –U hue –d hue
       postgres=# \d auth_permission;

    3. Drop the foreign key that you retrieved in the previous step.

       postgres=# ALTER TABLE auth_permission DROP CONSTRAINT content_type_id_refs_id_XXXXXX;

    4. Delete the rows in the django_content_type table.

       postgres=# TRUNCATE django_content_type CASCADE;

    5. In Hue service instance page, Actions > Load Database. Confirm you want to load the database by clicking Load Database.
    6. Add back the foreign key you dropped.

       bash# su – postgres
       $ psql –h localhost –U hue –d hue 
       postgres=# ALTER TABLE auth_permission ADD CONSTRAINT content_type_id_refs_id_XXXXXX FOREIGN KEY (content_type_id) REFERENCES django_content_type(id) DEFERRABLE INITIALLY DEFERRED;

18. Start the Hue service.

Use the following instructions to configure the Hue Server with an Oracle database if you are working on a parcel-based deployment. If you are using packages, see Configuring the Hue Server to Store Data in Oracle (Package Installation).

For information about installing and configuring an Oracle database , see Oracle Database.

  Important: Configure the database for character set AL32UTF8 and national character set UTF8.

If you have a parcel-based environment, see Configuring the Hue Server to Store Data in Oracle (Parcel Installation).

  Important: Configure the database for character set AL32UTF8 and national character set UTF8.

1. Download the Oracle libraries at Instant Client for Linux x86-64 Version 11.1.0.7.0, Basic and SDK (with headers) zip files to the same directory.
2. Unzip the Oracle client zip files.
3. Set environment variables to reference the libraries.

   $ export ORACLE_HOME=oracle_download_directory 
   $ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$ORACLE_HOME

4. Create a symbolic link for the shared object:

   $ cd $ORACLE_HOME 
   $ ln -sf libclntsh.so.11.1 libclntsh.so

5. Install the required packages.

   RHEL

   $ sudo yum install gcc python-devel python-pip python-setuptools libaio

   SLES

   $ sudo zypper install gcc python-devel python-pip python-setuptools libaio

   Ubuntu or Debian

   $ sudo apt-get install gcc python-devel python-pip python-setuptools libaio1

6. For CDH versions lower than 5.3, install the Python Oracle library:
     Note: HUE_HOME is a reference to the location of your Hue installation. For package installs, this is usually /usr/lib/hue; for parcel installs, this is usually, /opt/cloudera/parcels/<parcel version>/lib/hue/.

   $ HUE_HOME/build/env/bin/pip install cx_Oracle

7. For CDH versions lower than 5.3, upgrade django south:

   $ HUE_HOME/build/env/bin/pip install south --upgrade

8. In the Cloudera Manager Admin Console, go to the Hue service status page.
9. Select Actions > Stop. Confirm you want to stop the service by clicking Stop.
10. Select Actions > Dump Database. Confirm you want to dump the database by clicking Dump Database.
11. Click the Configuration tab.
12. Select Scope > All.
13. Select Category > Advanced.
14. Set the Hue Service Environment Advanced Configuration Snippet (Safety Valve) property to

    ORACLE_HOME=oracle_download_directory
    LD_LIBRARY_PATH=$LD_LIBRARY_PATH:oracle_download_directory

15. Set the Hue Service Advanced Configuration Snippet (Safety Valve) for hue_safety_valve.ini property.
      Note: If you set Hue Database Hostname, Hue Database Port, Hue Database Username, and Hue Database Password at the service-level, under Service-Wide > Database, you can omit those properties from the server-lever configuration above and avoid storing the Hue password as plain text. In either case, set engine and name in the server-level safety-valve.
    Add the following options (and modify accordingly for your setup):

    [desktop]
    [[database]]
    host=localhost
    port=1521
    engine=oracle
    user=hue
    password=secretpassword
    name=<SID of the Oracle database, for example, 'XE'>

    For CDH 5.1 and higher you can use an Oracle service name. To use the Oracle service name instead of the SID, use the following configuration instead:

    port=0
    engine=oracle
    user=hue
    password=secretpassword
    name=oracle.example.com:1521/orcl.example.com

    The directive port=0 allows Hue to use a service name. The name string is the connect string, including hostname, port, and service name.

    To add support for a multithreaded environment, set the threaded option to true under the [desktop]>[[database]] section.

    options={"threaded":true}

16. Grant required permissions to the hue user in Oracle:

    GRANT CREATE <sequence> TO <user>; 
    GRANT CREATE <session> TO <user>; 
    GRANT CREATE <table> TO <user>; 
    GRANT CREATE <view> TO <user>; 
    GRANT CREATE <procedure> TO <user>; 
    GRANT CREATE <trigger> TO <user>; 
    GRANT EXECUTE ON sys.dbms_crypto TO <user>; 
    GRANT EXECUTE ON SYS.DBMS_LOB TO <user>;

17. Go to the Hue Server instance in Cloudera Manager and select Actions > Synchronize Database.
18. Ensure you are connected to Oracle as the hue user, then run the following command to delete all data from Oracle tables:

    > set pagesize 100;
    > SELECT 'DELETE FROM ' || table_name || ';' FROM user_tables; 

19. Run the statements generated in the preceding step.
20. Commit your changes.

    commit;

21. Load the data that you dumped. Go to the Hue Server instance and select Actions > Load Database. This step is not necessary if you have a fresh Hue install with no data or if you don’t want to save the Hue data.
22. Start the Hue service.