HUE配置文件hue.ini 的database模块详解（包含qlite、mysql、 psql、和oracle）（图文详解）（分HA集群和非HA集群）

不多说，直接上干货！

　　Hue配置文件里，提及到，提供有postgresql_psycopg2, mysql, sqlite3 or oracle。

　　 注意：Hue本身用到的是sqlite3。

　　在哪里呢，怎么看呢？

　　desktop.db这个就是Hue用的 sqlite3数据库。

https://www.cloudera.com/documentation/enterprise/latest/topics/cdh_ig_hue_config.html#concept_ezg_b2s_hl

　　　　首先，看下官网的参考步骤

http://archive.cloudera.com/cdh5/cdh/5/hue-3.9.0-cdh5.5.0/manual.html

一、以下是默认的配置文件

 # Configuration options for specifying the Desktop Database. For more info,
  # see http://docs.djangoproject.com/en/1.4/ref/settings/#database-engine
  # ------------------------------------------------------------------------
  [[database]]
    # Database engine is typically one of:
    # postgresql_psycopg2, mysql, sqlite3 or oracle.
    #
    # Note that for sqlite3, 'name', below is a path to the filename. For other backends, it is the database name.
    # Note for Oracle, options={"threaded":true} must be set in order to avoid crashes.
    # Note for Oracle, you can use the Oracle Service Name by setting "port=0" and then "name=<host>:<port>/<service_name>".
    # Note for MariaDB use the 'mysql' engine.
    ## engine=sqlite3
    ## host=
    ## port=
    ## user=
    ## password=
    ## name=desktop/desktop.db
    ## options={}

###########################################################################
# Settings for the RDBMS application
###########################################################################

[librdbms]
  # The RDBMS app can have any number of databases configured in the databases
  # section. A database is known by its section name
  # (IE sqlite, mysql, psql, and oracle in the list below).

  [[databases]]
    # sqlite configuration.
    ## [[[sqlite]]]
      # Name to show in the UI.
      ## nice_name=SQLite

      # For SQLite, name defines the path to the database.
      ## name=/tmp/sqlite.db

      # Database backend to use.
      ## engine=sqlite

      # Database options to send to the server when connecting.
      # https://docs.djangoproject.com/en/1.4/ref/databases/
      ## options={}

    # mysql, oracle, or postgresql configuration.
    ## [[[mysql]]]
      # Name to show in the UI.
      ## nice_name="My SQL DB"

      # For MySQL and PostgreSQL, name is the name of the database.
      # For Oracle, Name is instance of the Oracle server. For express edition
      # this is 'xe' by default.
      ## name=mysqldb

      # Database backend to use. This can be:
      # . mysql
      # . postgresql
      # . oracle
      ## engine=mysql

      # IP or hostname of the database to connect to.
      ## host=localhost

      # Port the database server is listening to. Defaults are:
      # . MySQL:
      # . PostgreSQL:
      # . Oracle Express Edition:
      ## port=

      # Username to authenticate with when connecting to the database.
      ## user=example

      # Password matching the username to authenticate with when
      # connecting to the database.
      ## password=example

      # Database options to send to the server when connecting.
      # https://docs.djangoproject.com/en/1.4/ref/databases/
      ## options={}

二、以下是跟我机器集群匹配的配置文件（非HA集群下怎么配置Hue的database模块）

###########################################################################
# Settings for the RDBMS application
###########################################################################

[librdbms]
  # The RDBMS app can have any number of databases configured in the databases
  # section. A database is known by its section name
  # (IE sqlite, mysql, psql, and oracle in the list below).

  [[databases]]
    # sqlite configuration.
    [[[sqlite]]]
      # Name to show in the UI.
      nice_name=SQLite

      # For SQLite, name defines the path to the database.
      name=/home/hadoop/app/hue/desktop/desktop.db

      # Database backend to use.
      engine=sqlite

    # mysql, oracle, or postgresql configuration.
    [[[mysql]]]
      # Name to show in the UI.
      nice_name="My SQL DB"

      # For MySQL and PostgreSQL, name is the name of the database.
      # For Oracle, Name is instance of the Oracle server. For express edition
      # this is 'xe' by default.
      name=test

      # Database backend to use. This can be:
      # . mysql
      # . postgresql
      # . oracle
      engine=mysql

      # IP or hostname of the database to connect to.
      host=bigdatamaster

      # Port the database server is listening to. Defaults are:
      # . MySQL:
      # . PostgreSQL:
      # . Oracle Express Edition:
      port=

      # Username to authenticate with when connecting to the database.
      user=root

      # Password matching the username to authenticate with when
      # connecting to the database.
      password=rootroot

      # Database options to send to the server when connecting.
      # https://docs.djangoproject.com/en/1.4/ref/databases/
      ## options={}

　　

　　当然，这里，也可以用hive里安装的mysql里的数据库hive（命名）。（我一般用这种）

　　

hive> show databases;
OK
default
hive
Time taken: 0.074 seconds, Fetched:  row(s)
hive> 

    # mysql, oracle, or postgresql configuration.
    [[[mysql]]]
      # Name to show in the UI.
      nice_name="My SQL DB"

      # For MySQL and PostgreSQL, name is the name of the database.
      # For Oracle, Name is instance of the Oracle server. For express edition
      # this is 'xe' by default.
      name=hive

      # Database backend to use. This can be:
      # . mysql
      # . postgresql
      # . oracle
      engine=mysql

      # IP or hostname of the database to connect to.
      host=bigdatamaster

      # Port the database server is listening to. Defaults are:
      # . MySQL:
      # . PostgreSQL:
      # . Oracle Express Edition:
      port=

      # Username to authenticate with when connecting to the database.
      user=hive

      # Password matching the username to authenticate with when
      # connecting to the database.
      password=hive

      # Database options to send to the server when connecting.
      # https://docs.djangoproject.com/en/1.4/ref/databases/
      ## options={}

　　最后的界面，如下

三、以下是跟我机器集群匹配的配置文件（HA集群下怎么配置Hue的database模块）

　

<configuration>
        <property>
                  <name>javax.jdo.option.ConnectionURL</name>
                  <value>jdbc:mysql://bigdata-pro01.kfk.com:3306/metastore?createDatabaseIfNotExist=true</value>
        </property>
        <property>
                  <name>javax.jdo.option.ConnectionDriverName</name>
                  <value>com.mysql.jdbc.Driver</value>
        </property>
        <property>
                  <name>javax.jdo.option.ConnectionUserName</name>
                  <value>root</value>
        </property>
        <property>
                  <name>javax.jdo.option.ConnectionPassword</name>
                  <value>root</value>
        </property>
        <property>
                  <name>hive.cli.print.header</name>
                  <value>true</value>
                  <description>Whether to print the names of the columns in query output.</description>
        </property>
        <property>
                  <name>hive.cli.print.current.db</name>
                  <value>true</value>
                  <description>Whether to include the current database in the Hive prompt.</description>
        </property>
        <property>
                  <name>hbase.zookeeper.quorum</name>
                  <value>bigdata-pro01.kfk.com,bigdata-pro02.kfk.com,bigdata-pro03.kfk.com</value>
        </property>
</configuration>

　　所以，我这里设置如下：

###########################################################################
# Settings for the RDBMS application
###########################################################################

[librdbms]
  # The RDBMS app can have any number of databases configured in the databases
  # section. A database is known by its section name
  # (IE sqlite, mysql, psql, and oracle in the list below).

  [[databases]]
    # sqlite configuration.
    [[[sqlite]]]
      # Name to show in the UI.
      nice_name=SQLite

      # For SQLite, name defines the path to the database.
      name=/opt/modules/hue-3.9.-cdh5.5.0/desktop/desktop.db

      # Database backend to use.
      engine=sqlite

      # Database options to send to the server when connecting.
      # https://docs.djangoproject.com/en/1.4/ref/databases/
      ## options={}

    # mysql, oracle, or postgresql configuration.
    [[[mysql]]]
      # Name to show in the UI.
      nice_name="My SQL DB"

      # For MySQL and PostgreSQL, name is the name of the database.
      # For Oracle, Name is instance of the Oracle server. For express edition
      # this is 'xe' by default.
      name=metastore

      # Database backend to use. This can be:
      # . mysql
      # . postgresql
      # . oracle
      engine=mysql

      # IP or hostname of the database to connect to.
      host=bigdata-pro01.kfk.com

      # Port the database server is listening to. Defaults are:
      # . MySQL:
      # . PostgreSQL:
      # . Oracle Express Edition:
      port=

      # Username to authenticate with when connecting to the database.
      user=root

      # Password matching the username to authenticate with when
      # connecting to the database.
      password=root

      # Database options to send to the server when connecting.
      # https://docs.djangoproject.com/en/1.4/ref/databases/
      ## options={}

　　然后，关闭mysql，再重启mysql，重启一下hue。

　再，停掉mysql，重启mysql和hue

[kfk@bigdata-pro01 conf]$ sudo service mysqld restart
Stopping mysqld:                                           [  OK  ]
Starting mysqld:                                           [  OK  ]
[kfk@bigdata-pro01 conf]$ 

[kfk@bigdata-pro01 hue-3.9.0-cdh5.5.0]$ ./build/env/bin/supervisor
[INFO] Not running as root, skipping privilege drop
starting server with options:
{'daemonize': False,
 'host': 'bigdata-pro01.kfk.com',
 'pidfile': None,
 'port': 8888,
 'server_group': 'hue',
 'server_name': 'localhost',
 'server_user': 'hue',
 'ssl_certificate': None,
 'ssl_cipher_list': 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA',
 'ssl_private_key': None,
 'threads': 40,
 'workdir': None}

总结：

　　　　即，Hue的服务器（名字为My SQL DB，一般是mysql, oracle, or postgresql）。通常用mysql。

　　　　　　那么，它的数据库是metastore，是在hive里新建的mysql来充当它的元数据库。

 <property>
                  <name>javax.jdo.option.ConnectionURL</name>
                  <value>jdbc:mysql://master:3306/metastore?createDatabaseIfNotExist=true</value>
 </property>

　　　　Hue的服务器（名字为SQLite），那么它的数据库是/opt/modules/hue-3.9.0-cdh5.5.0/desktop/desktop.db

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