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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE refentry
PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
<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>
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