openstack-manuals/doc/install-guide/section_debconf-dbconfig-common.xml

<?xml version="1.0" encoding="utf-8"?>
<section xml:id="debconf-dbconfig-common"
  xmlns="http://docbook.org/ns/docbook"
  xmlns:xi="http://www.w3.org/2001/XInclude"
  xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0">
  <title>Configure the database with dbconfig-common</title>
  <para>Many of the OpenStack services need to be configured
    to access a database. These are configured through a DSN (Database
    Source Name) directive as follows:</para>
  <programlisting language="ini">[database]
connection = mysql://keystone:0dec658e3f14a7d@localhost/keystonedb</programlisting>
  <para>This <literal>connection</literal> directive will be handled by
    the <package>dbconfig-common</package> package, which provides a
    standard Debian interface. It enables you to configure Debian
    database parameters. It includes localized prompts for many
    languages and it supports the following database backends:
    SQLite, MySQL, and PostgreSQL.</para>
  <para>By default, the <package>dbconfig-common</package> package
    configures the OpenStack services to use SQLite. So if you use
    <package>debconf</package> in non-interactive mode and without
    pre-seeding, the OpenStack services that you install will use
    SQLite.</para>
  <para>By default, <package>dbconfig-common</package> does not
    provide access to database servers over a network. If you want the
      <package>dbconfig-common</package> package to prompt for remote
    database servers that are accessed over a network and not through
    a UNIX socket file, reconfigure it, as follows:</para>
  <screen><prompt>#</prompt> <userinput>apt-get install dbconfig-common &amp;&amp; dpkg-reconfigure dbconfig-common</userinput></screen>
  <para>These screens appear when you re-configure the
      <package>dbconfig-common</package> package:</para>
  <informalfigure>
    <mediaobject>
      <imageobject>
        <imagedata scale="40"
          fileref="figures/debconf-screenshots/dbconfig-common_keep_admin_pass.png"
        />
      </imageobject>
    </mediaobject>
  </informalfigure>
  <informalfigure>
    <mediaobject>
      <imageobject>
        <imagedata scale="40"
          fileref="figures/debconf-screenshots/dbconfig-common_used_for_remote_db.png"
        />
      </imageobject>
    </mediaobject>
  </informalfigure>
  <para>Unlike other <package>debconf</package> prompts, you cannot
    pre-seed the responses for the <package>dbconfig-common</package>
    prompts by using <command>debconf-set-selections</command>.
    Instead, you must create a file in
      <filename>/etc/dbconfig-common</filename>. For example, you
    might create a keystone configuration file for
      <package>dbconfig-common</package> that is located in
      <filename>/etc/dbconfig-common/keystone.conf</filename>, as
    follows:</para>
  <programlisting language="ini">dbc_install='true'
dbc_upgrade='true'
dbc_remove=''
dbc_dbtype='mysql'
dbc_dbuser='keystone'
dbc_dbpass='PASSWORD'
dbc_dbserver=''
dbc_dbport=''
dbc_dbname='keystonedb'
dbc_dbadmin='root'
dbc_basepath=''
dbc_ssl=''
dbc_authmethod_admin=''
dbc_authmethod_user=''</programlisting>
  <para>After you create this file, run this command:</para>
  <screen><prompt>#</prompt> <userinput>apt-get install keystone</userinput></screen>
  <para>The Identity Service is installed with MySQL as the database
    back end, <literal>keystonedb</literal> as database name, and the
    localhost socket file. The corresponding DNS will then be:</para>
  <programlisting language="ini">[database]
connection = mysql://keystone:PASSWORD@localhost/keystonedb</programlisting>
  <para>The <package>dbconfig-common</package> package will configure
    MySQL for these access rights, and create the database for you.
    Since OpenStack 2014.1.1, all OpenStack packages in Debian are performing
    the following MySQL query after database creation (if you decide
    to use MySQL as a back-end):</para>
    <programlisting language="ini">ALTER DATABASE keystone CHARACTER SET utf8 COLLATE utf8_unicode_ci</programlisting>
    <para>So, if using Debian, you wont need to care about database
      creation, access rights and character sets. All that is handled
      for you by the packages.</para>
  <para>As an example, here are screenshots from the
    <package>cinder-common</package> package:</para>
  <informalfigure>
    <mediaobject>
      <imageobject>
        <imagedata scale="40"
          fileref="figures/debconf-screenshots/dbconfig-common_1_configure-with-dbconfig-yes-no.png"
        />
      </imageobject>
    </mediaobject>
  </informalfigure>
  <informalfigure>
    <mediaobject>
      <imageobject>
        <imagedata scale="40"
          fileref="figures/debconf-screenshots/dbconfig-common_2_db-types.png"
        />
      </imageobject>
    </mediaobject>
  </informalfigure>
  <informalfigure>
    <mediaobject>
      <imageobject>
        <imagedata scale="40"
          fileref="figures/debconf-screenshots/dbconfig-common_3_connection_method.png"
        />
      </imageobject>
    </mediaobject>
  </informalfigure>
  <informalfigure>
    <mediaobject>
      <imageobject>
        <imagedata scale="40"
          fileref="figures/debconf-screenshots/dbconfig-common_4_mysql_root_password.png"
        />
      </imageobject>
    </mediaobject>
  </informalfigure>
  <informalfigure>
    <mediaobject>
      <imageobject>
        <imagedata scale="40"
          fileref="figures/debconf-screenshots/dbconfig-common_5_mysql_app_password.png"
        />
      </imageobject>
    </mediaobject>
  </informalfigure>
  <informalfigure>
    <mediaobject>
      <imageobject>
        <imagedata scale="40"
          fileref="figures/debconf-screenshots/dbconfig-common_6_mysql_app_password_confirm.png"
        />
      </imageobject>
    </mediaobject>
  </informalfigure>
  <para>By default in Debian, you can access the MySQL server from either
    localhost through the socket file or 127.0.0.1. To access it over the
    network, you must edit the <filename>/etc/mysql/my.cnf</filename> file,
    and the <literal>mysql.user</literal> table. To do so, Debian provides
    a helper script in the <package>openstack-deploy</package> package.
    To use it, install the package and run:</para>
  <screen><prompt>#</prompt> <userinput>/usr/share/openstack-deploy/mysql-remote-root</userinput></screen>
  <para>Alternatively, if you do not want to install this package, run
    this script to enable remote root access:</para>
  <programlisting language="bash">#!/bin/sh

set -e

SQL="mysql --defaults-file=/etc/mysql/debian.cnf -Dmysql -e"

ROOT_PASS=`${SQL} "SELECT Password FROM user WHERE User='root' LIMIT 1;" \
  | tail -n 1`
${SQL} "REPLACE INTO user SET host='%', user='root',\
  password='${ROOT_PASS}', Select_priv='Y', Insert_priv='Y',\
  Update_priv='Y', Delete_priv='Y', Create_priv='Y', Drop_priv='Y',\
  Reload_priv='Y', Shutdown_priv='Y', Process_priv='Y',  File_priv='Y',\
  Grant_priv='Y', References_priv='Y', Index_priv='Y', Alter_priv='Y',\
  Super_priv='Y', Show_db_priv='Y', Create_tmp_table_priv='Y',\
  Lock_tables_priv='Y', Execute_priv='Y', Repl_slave_priv='Y',\
  Repl_client_priv='Y', Create_view_priv='Y', Show_view_priv='Y',\
  Create_routine_priv='Y', Alter_routine_priv='Y', Create_user_priv='Y',\
  Event_priv='Y', Trigger_priv='Y' "
${SQL} "FLUSH PRIVILEGES"
sed -i 's|^bind-address[ \t]*=.*|bind-address = 0.0.0.0|' /etc/mysql/my.cnf
/etc/init.d/mysql restart</programlisting>
  <para>You must enable remote access before you install OpenStack
    services on multiple nodes.</para>
</section>