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<refentry id="ctdb.sysconfig.5">

  <refmeta>
    <refentrytitle>ctdb.sysconfig</refentrytitle>
    <manvolnum>5</manvolnum>
    <refmiscinfo class="source">ctdb</refmiscinfo>
    <refmiscinfo class="manual">CTDB - clustered TDB database</refmiscinfo>
  </refmeta>

  <refnamediv>
    <refname>ctdb.sysconfig</refname>
    <refpurpose>CTDB daemon configuration file</refpurpose>
  </refnamediv>

  <refsect1>
    <title>DESCRIPTION</title>

    <para>
      This file contains configuration that affects the operation of
      CTDB.  This is a distribution-specific service configuration
      file such as <filename>/etc/sysconfig/ctdb</filename> (Red Hat)
      or <filename>/etc/default/ctdb</filename> (Debian) and is a
      shell script (see
      <citerefentry><refentrytitle>sh</refentrytitle>
      <manvolnum>1</manvolnum></citerefentry>).
    </para>

  </refsect1>

  <refsect1>
    <title>
      GLOBAL CONFIGURATION
    </title>

    <variablelist>

      <varlistentry>
	<term>CTDB_INIT_STYLE=debian|redhat|suse</term>
	<listitem>
	  <para>
	    This is the init style used by the Linux distribution (or
	    other operating system) being used.  This is usually
	    determined dynamically by checking the system.  This
	    variable is used by the initscript to determine which init
	    system primitives to use.  It is also used by some
	    eventscripts to choose the name of initscripts for certain
	    services, since these can vary between distributions.
	  </para>
	  <para>
	    If using CTDB's event scripts are unable to determine an
	    appropriate default then this option can also be placed in
	    a relevant
	    <citerefentry><refentrytitle>ctdb-script.options</refentrytitle>
	    <manvolnum>5</manvolnum></citerefentry> file.
	  </para>
	  <para>
	    Default: NONE.  Guessed, based on features of
	    distribution.
	  </para>
	</listitem>
      </varlistentry>

    </variablelist>
  </refsect1>

  <refsect1>
    <title>
      RESOURCE LIMITS
    </title>

    <refsect2>
      <title>
	Maximum number of open files
      </title>

      <para>
	CTDB can use a lot of file descriptors, especially when used
	with Samba.  If there are thousands of smbd processes
	connected to CTDB when this can mean that thousands of file
	descriptors are used.  For CTDB, it is often necessary to
	increase limit on the maximum number of open files.
      </para>

      <para>
	The maximum number of open files should be configured using an
	operating system mechanism.
      </para>

      <variablelist>

	<varlistentry>
	  <term>
	    systemd
	  </term>
	  <listitem>
	    <para>
	      The
	      <literal>LimitNOFILE=<option>LIMIT</option></literal>
	      option can be used in a unit/service file increase the
	      maximum number of open files.  See
	      <citerefentry><refentrytitle>systemd.exec</refentrytitle>
	      <manvolnum>5</manvolnum></citerefentry> for details.
	    </para>
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term>
	    SYSV init
	  </term>
	  <listitem>
	    <para>
	      Use a command like <command>ulimit -n
	      <option>LIMIT</option></command> to increase the maximum
	      number of open files.  This command can be put in the
	      relevant distribution-specific service configuration file.
	    </para>
	  </listitem>
	</varlistentry>

      </variablelist>

    </refsect2>

    <refsect2>
      <title>
	Allowing core dumps
      </title>

      <para>
	Many distributions do not allow core dump files to be
	generated by default.  To assist with debugging, core files
	can be enabled.  This should be configured using an operating
	system mechanism.
      </para>

      <variablelist>

	<varlistentry>
	  <term>
	    systemd
	  </term>
	  <listitem>
	    <para>
	      The <literal>LimitCORE=0|unlimited</literal> option can
	      be used in a unit/service file.  <literal>0</literal>
	      disallows core files, <literal>unlimited</literal>
	      allows them.  maximum number of open files.  See
	      <citerefentry><refentrytitle>systemd.exec</refentrytitle>
	      <manvolnum>5</manvolnum></citerefentry> for details.
	    </para>
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term>
	    SYSV init
	  </term>
	  <listitem>
	    <para>
	      Use a command like <command>ulimit -c 0|unlimited</command>
	      to disable or enable core files as required.  This
	      command can be put in the relevant distribution-specific
	      service configuration file.
	    </para>
	  </listitem>
	</varlistentry>

      </variablelist>

    </refsect2>

  </refsect1>

  <refsect1>
    <title>FILES</title>

    <simplelist>
      <member><filename>/etc/sysconfig/ctdb</filename></member>
      <member><filename>/etc/default/ctdb</filename></member>
      <member><filename>/usr/local/etc/ctdb/script.options</filename></member>
    </simplelist>
  </refsect1>

  <refsect1>
    <title>SEE ALSO</title>
    <para>
      <citerefentry><refentrytitle>ctdbd</refentrytitle>
      <manvolnum>1</manvolnum></citerefentry>,

      <citerefentry><refentrytitle>ctdb-script.options</refentrytitle>
      <manvolnum>5</manvolnum></citerefentry>,

      <citerefentry><refentrytitle>ctdb</refentrytitle>
      <manvolnum>7</manvolnum></citerefentry>,

      <ulink url="http://ctdb.samba.org/"/>
    </para>
  </refsect1>

  <refentryinfo>
    <author>
      <contrib>
	This documentation was written by
	Martin Schwenke
      </contrib>
    </author>

    <copyright>
      <year>2007</year>
      <holder>Andrew Tridgell</holder>
      <holder>Ronnie Sahlberg</holder>
    </copyright>
    <legalnotice>
      <para>
	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License as
	published by the Free Software Foundation; either version 3 of
	the License, or (at your option) any later version.
      </para>
      <para>
	This program is distributed in the hope that it will be
	useful, but WITHOUT ANY WARRANTY; without even the implied
	warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
	PURPOSE.  See the GNU General Public License for more details.
      </para>
      <para>
	You should have received a copy of the GNU General Public
	License along with this program; if not, see
	<ulink url="http://www.gnu.org/licenses"/>.
      </para>
    </legalnotice>
  </refentryinfo>

</refentry>
