samba-mirror/docs-xml/manpages/vfs_ceph_new.8.xml

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<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
<refentry id="vfs_ceph_new.8">

<refmeta>
	<refentrytitle>vfs_ceph_new</refentrytitle>
	<manvolnum>8</manvolnum>
	<refmiscinfo class="source">Samba</refmiscinfo>
	<refmiscinfo class="manual">System Administration tools</refmiscinfo>
	<refmiscinfo class="version">&doc.version;</refmiscinfo>
</refmeta>


<refnamediv>
	<refname>vfs_ceph_new</refname>
	<refpurpose>
		Utilize features provided by libcephfs low-level APIs
	</refpurpose>
</refnamediv>

<refsynopsisdiv>
	<cmdsynopsis>
		<command>vfs objects = ceph_new</command>
	</cmdsynopsis>
</refsynopsisdiv>

<refsect1>
	<title>DESCRIPTION</title>

	<para>This VFS module is part of the
	<citerefentry><refentrytitle>samba</refentrytitle>
	<manvolnum>8</manvolnum></citerefentry> suite.</para>

	<para>
		The <command>vfs_ceph_new</command> VFS module exposes
		CephFS specific features for use by Samba.
	</para>

	<para>
		Ceph is a distributed network file system designed to provide
		excellent performance, reliability, and scalability. This is a
		shared library allowing applications to access a Ceph
		distributed file system via a POSIX-like interface.
	</para>

	<para>
		This module can be combined with other modules, but it
		should be the last module in the <command>vfs objects</command>
		list. Modules added to this list to the right of the ceph
		entry may not have any effect at all.
	</para>

	<para>
		<command>vfs_ceph_new</command> performs mapping between Windows
		and POSIX Access Control Lists (ACLs). To ensure correct
		processing and enforcement of POSIX ACLs, the following Ceph
		configuration parameters are automatically applied:
	</para>
	<programlisting>
		<command>client acl type = posix_acl</command>
		<command>fuse default permissions = false</command>
	</programlisting>

	<para>
	<emphasis role="strong">NOTE</emphasis>:
	This is a second implementation of a ceph module which uses libcephfs
	low-level APIs (compared to the original
	<citerefentry><refentrytitle>vfs_ceph</refentrytitle>
	<manvolnum>8</manvolnum></citerefentry> module which uses path-based
	APIs). Using the low-level API allows more optimized and fine-grained
	access to the Ceph storage layer.
	</para>
</refsect1>

<refsect1>
	<title>CONFIGURATION</title>

	<para>
		<command>vfs_ceph_new</command> requires that the underlying
		share path is a Ceph filesystem.
	</para>

	<programlisting>
		<smbconfsection name="[share]"/>
		<smbconfoption name="vfs objects">ceph_new</smbconfoption>
		<smbconfoption name="path">/non-mounted/cephfs/path</smbconfoption>
		<smbconfoption name="kernel share modes">no</smbconfoption>
	</programlisting>

	<para>
		Since <command>vfs_ceph_new</command> does not require a
		filesystem mount, the share <command>path</command> is treated
		differently: it is interpreted as an absolute path within the
		Ceph filesystem on the attached Ceph cluster.
		In a ctdb cluster environment where ctdb manages Samba,
		<command>CTDB_SAMBA_SKIP_SHARE_CHECK=yes</command> must be
		configured to disable local share path checks, otherwise ctdb
		will not reach a healthy state.
	</para>

	<para>
		Note that currently <command>kernel share modes</command> have
		to be disabled in a share running with the CephFS vfs module for
		file serving to work properly.
	</para>
</refsect1>

<refsect1>
	<title>OPTIONS</title>

	<variablelist>

		<varlistentry>
		<term>ceph_new:config_file = path</term>
		<listitem>
		<para>
			Allows one to define a ceph configfile to use. Empty by default.
		</para>
		<para>
			Example: ceph_new:config_file =
			/etc/ceph/ceph.conf
		</para>
		</listitem>
		</varlistentry>

		<varlistentry>
		<term>ceph_new:user_id = name</term>
		<listitem>
		<para>
			Allows one to explicitly set the client ID used for the
			CephFS mount handle. Empty by default (use the libcephfs
			client default).
		</para>
		<para>
			Example: ceph_new:user_id = samba
		</para>
		</listitem>
		</varlistentry>

		<varlistentry>
		<term>ceph_new:filesystem = fs_name</term>
		<listitem>
		<para>
			Allows one to explicitly select the CephFS file system
			to use when the Ceph cluster supports more than one
			file system. Empty by default (use the default file
			system of the Ceph cluster).
		</para>
		<para>
			Example: ceph_new:filesystem = myfs2
		</para>
		</listitem>
		</varlistentry>

		<varlistentry>
		<term>ceph_new:proxy = [ yes | no | auto ]</term>
		<listitem>
		<para>
			Allows one to indicate use of the libcephfs proxy library
			for optimized resource utilization, allowing more simultaneous
			client connections. Prerequisites include the presence of
			<emphasis>libcephfs_proxy.so.X</emphasis> shared library file
			under loadable locations for dynamic linker and an active(running)
			<emphasis>libcephfsd</emphasis> daemon.
		</para>

		<itemizedlist>
			<listitem><para><constant>no</constant> (default) - Do
			not use the proxy library but regular connection through
			<emphasis>libcephfs.so.X</emphasis>.</para></listitem>

			<listitem><para><constant>yes</constant> - Always use
			the proxy library and fail the client connection request
			if prerequisites are unmet.</para></listitem>

			<listitem><para><constant>auto</constant> - Attempt to
			use the proxy library but fall back to the regular cephfs
			connection if prerequisites are unmet.</para></listitem>

		</itemizedlist>

		</listitem>
		</varlistentry>
	</variablelist>

</refsect1>

<refsect1>
	<title>VERSION</title>

	<para>
		This man page is part of version &doc.version; of the Samba suite.
	</para>
</refsect1>

<refsect1>
	<title>AUTHOR</title>

	<para>The original Samba software and related utilities
	were created by Andrew Tridgell. Samba is now developed
	by the Samba Team as an Open Source project similar
	to the way the Linux kernel is developed.</para>

</refsect1>

</refentry>