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diff --git a/doc/admin-guide/en-US/admin_ACLs.xml b/doc/admin-guide/en-US/admin_ACLs.xml new file mode 100644 index 00000000000..156e52c17f2 --- /dev/null +++ b/doc/admin-guide/en-US/admin_ACLs.xml @@ -0,0 +1,206 @@ +<?xml version='1.0' encoding='UTF-8'?> +<!-- This document was created with Syntext Serna Free. --><!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "docbookV4.5/docbookx.dtd" []> +<chapter id="chap-Administration_Guide-ACLs"> + <title>POSIX Access Control Lists </title> + <para>POSIX Access Control Lists (ACLs) allows you to assign different permissions for different users or +groups even though they do not correspond to the original owner or the owning group. + </para> + <para>For example: User john creates a file but does not want to allow anyone to do anything with this +file, except another user, antony (even though there are other users that belong to the group john). +</para> + <para>This means, in addition to the file owner, the file group, and others, additional users and groups can +be granted or denied access by using POSIX ACLs. +</para> + <section id="sect-Administration_Guide-ACLs-Activating_ACLs"> + <title>Activating POSIX ACLs Support </title> + <para>To use POSIX ACLs for a file or directory, the partition of the file or directory must be mounted with +POSIX ACLs support. +</para> + <section id="sect-Administration_Guide-ACLs-Activating_ACLs-Server"> + <title>Activating POSIX ACLs Support on Sever </title> + <para>To mount the backend export directories for POSIX ACLs support, use the following command: +</para> + <para><command># mount -o acl <replaceable>device-name</replaceable><replaceable>partition</replaceable></command> +</para> + <para>For example: +</para> + <para><command># mount -o acl /dev/sda1 /export1 </command></para> + <para>Alternatively, if the partition is listed in the /etc/fstab file, add the following entry for the partition +to include the POSIX ACLs option: +</para> + <para><command>LABEL=/work /export1 ext3 rw, acl 14 </command></para> + </section> + <section> + <title>Activating POSIX ACLs Support on Client </title> + <para>To mount the glusterfs volumes for POSIX ACLs support, use the following command: +</para> + <para><command># mount –t glusterfs -o acl <replaceable>severname:volume-id</replaceable><replaceable>mount point</replaceable></command> +</para> + <para>For example: +</para> + <para><command># mount -t glusterfs -o acl 198.192.198.234:glustervolume /mnt/gluster</command> +</para> + </section> + </section> + <section> + <title>Setting POSIX ACLs </title> + <para>You can set two types of POSIX ACLs, that is, access ACLs and default ACLs. You can use +access ACLs to grant permission for a specific file or directory. You can use default ACLs only +on a directory but if a file inside that directory does not have an ACLs, it inherits the permissions of +the default ACLs of the directory. +</para> + <para>You can set ACLs for per user, per group, for users not in the user group for the file, and via the +effective right mask. +</para> + <section> + <title>Setting Access ACLs </title> + <para>You can apply access ACLs to grant permission for both files and directories. +</para> + <para><emphasis role="bold">To set or modify Access ACLs</emphasis> +</para> + <para>You can set or modify access ACLs use the following command: +</para> + <para><command># setfacl –m <replaceable>entry type</replaceable> file </command></para> + <para>The ACL entry types are the POSIX ACLs representations of owner, group, and other. +</para> + <para>Permissions must be a combination of the characters <command>r</command> (read), <command>w</command> (write), and <command>x</command> (execute). You must +specify the ACL entry in the following format and can specify multiple entry types separated by +commas. +</para> + <informaltable frame="all"> + <tgroup cols="2"> + <colspec colname="c1"/> + <colspec colname="c2"/> + <thead> + <row> + <entry>ACL Entry</entry> + <entry>Description</entry> + </row> + </thead> + <tbody> + <row> + <entry>u:uid:<permission> </entry> + <entry>Sets the access ACLs for a user. You can specify user name or UID </entry> + </row> + <row> + <entry>g:gid:<permission> </entry> + <entry>Sets the access ACLs for a group. You can specify group name or GID. </entry> + </row> + <row> + <entry>m:<permission> </entry> + <entry>Sets the effective rights mask. The mask is the combination of all access permissions of the owning group and all of the user and group entries. </entry> + </row> + <row> + <entry>o:<permission> </entry> + <entry>Sets the access ACLs for users other than the ones in the group for the file. </entry> + </row> + </tbody> + </tgroup> + </informaltable> + <para>If a file or directory already has an POSIX ACLs, and the setfacl command is used, the additional +permissions are added to the existing POSIX ACLs or the existing rule is modified. +</para> + <para>For example, to give read and write permissions to user antony: +</para> + <para><command># setfacl -m u:antony:rw /mnt/gluster/data/testfile </command></para> + </section> + <section> + <title>Setting Default ACLs </title> + <para>You can apply default ACLs only to directories. They determine the permissions of a file system +objects that inherits from its parent directory when it is created. +</para> + <para>To set default ACLs +</para> + <para>You can set default ACLs for files and directories using the following command: +</para> + <para><command># setfacl –m –-set <replaceable>entry type directory</replaceable></command> +</para> + <para>For example, to set the default ACLs for the /data directory to read for users not in the user group: +</para> + <para><command># setfacl –m --set o::r /mnt/gluster/data </command></para> + <para><note> + <para>An access ACLs set for an individual file can override the default ACLs permissions. +</para> + </note></para> + <para><emphasis role="bold">Effects of a Default ACLs </emphasis></para> + <para>The following are the ways in which the permissions of a directory's default ACLs are passed to the +files and subdirectories in it: +</para> + <itemizedlist> + <listitem> + <para>A subdirectory inherits the default ACLs of the parent directory both as its default ACLs and as an +access ACLs. +</para> + </listitem> + <listitem> + <para>A file inherits the default ACLs as its access ACLs. +</para> + </listitem> + </itemizedlist> + </section> + </section> + <section> + <title>Retrieving POSIX ACLs </title> + <para>You can view the existing POSIX ACLs for a file or directory. +</para> + <para><emphasis role="bold">To view existing POSIX ACLs </emphasis></para> + <itemizedlist> + <listitem> + <para>View the existing access ACLs of a file using the following command: +</para> + <para><command># getfacl <replaceable>path/filename</replaceable></command> +</para> + <para>For example, to view the existing POSIX ACLs for sample.jpg +</para> + <programlisting># getfacl /mnt/gluster/data/test/sample.jpg +# owner: antony +# group: antony +user::rw- +group::rw- +other::r--</programlisting> + </listitem> + <listitem> + <para>View the default ACLs of a directory using the following command: +</para> + <para><command># getfacl <replaceable>directory name</replaceable></command></para> + <para>For example, to view the existing ACLs for /data/doc +</para> + <programlisting># getfacl /mnt/gluster/data/doc +# owner: antony +# group: antony +user::rw- +user:john:r-- +group::r-- +mask::r-- +other::r-- +default:user::rwx +default:user:antony:rwx +default:group::r-x +default:mask::rwx +default:other::r-x</programlisting> + </listitem> + </itemizedlist> + </section> + <section> + <title>Removing POSIX ACLs </title> + <para>To remove all the permissions for a user, groups, or others, use the following command: +</para> + <para><command># setfacl -x <replaceable>ACL entry type file</replaceable></command></para> + <para>For example, to remove all permissions from the user antony: +</para> + <para><command># setfacl -x u:antony /mnt/gluster/data/test-file</command></para> + </section> + <section> + <title>Samba and ACLs </title> + <para>If you are using Samba to access GlusterFS FUSE mount, then POSIX ACLs are enabled by default. +Samba has been compiled with the <command>--with-acl-support</command> option, so no special flags are required +when accessing or mounting a Samba share. +</para> + </section> + <section> + <title>NFS and ACLs </title> + <para>Currently we do not support ACLs configuration through NFS, i.e. setfacl and getfacl commands do +not work. However, ACLs permissions set using Gluster Native Client applies on NFS mounts. +</para> + </section> +</chapter> |