====== Installation of xrootdfs automount code ======

This wiki page explains how to install the scripts needed to automount xrootdfs area on a given node.

Prerequisites:

  * xrootd software (binaries and libraries) are installed
  * autofs package is installed and running
  * fuse package is installed

In short:
<code bash>
cd /etc/yum.repos.d/
wget http://www.xrootd.org/binaries/xrootd-stable-slc6.repo
vi  xrootd-stable-slc5.repo
yum install yum-priorities
yum install xrootd-libs.x86_64 xrootd-server.x86_64 xrootd-client.x86_64 xrootd-fuse.x86_64 xrootd-debuginfo.x86_64
chown xrootd:xrootd /dataxrd
mkdir -p /dataxrd/atlas
chown xrootd:xrootd /dataxrd
chown xrootd:xrootd /dataxrd/atlas
scp root@atlas50:/etc/xrootd/xrootd-clustered.cfg  /etc/xrootd/xrootd-clustered.cfg
scp root@atlas50:/etc/xrootd/auth_file  /etc/xrootd/auth_file
vi /etc/sysconfig/iptables # add port
</code>

===== Installation of xrootdfs.sh script =====

As root account, create the file **/usr/bin/xrootdfs.sh** and set the flags for it to be executable.

Contents of /usr/bin/xrootdfs.sh are:
<file>
#!/bin/bash
exec /usr/bin/xrootdfs $@ >/dev/null 2>&1
</file>

===== Modification of autofs files =====

  * changes to /etc/auto.master

Add these lines to /etc/auto.master:
<file>
#mount of xrootdfs areas
/- /etc/auto.xrootdfs
</file>

  * create the /etc/auto.xrootdfs file

The file /etc/auto.xrootdfs contains the mount information needed to create the xrootdfs auto mounts.

For example:
<file>
/aschead01/atlas -fstype=fuse,rw,uid=xrootd,rdr=root\://aschead01.hep.anl.gov\:1094//atlas :xrootdfs.sh
/atlasfs/atlas -fstype=fuse,rw,uid=xrootd,rdr=root\://atlasfs.hep.anl.gov\:1094//atlas :xrootdfs.sh
/aschead02/atlas -fstype=fuse,rw,uid=xrootd,rdr=root\://aschead02.hep.anl.gov\:1094//atlas :xrootdfs.sh
</file>

  * Create the mount points as shown in /etc/auto.xrootdfs
<file>
mkdir -p /aschead01/atlas
mkdir -p /atlasfs/atlas
mkdir -p /aschead02/atlas
</file>

  * Restart autofs
<file>
/sbin/service autofs restart
</file>

  * Test if the mounts work. For example:
<file>
ls -l /atlasfs/atlas
total 9
drwxrwxrwx 1 xrootd atlas 4096 Feb 26 11:31 dq2
drwxrwxrwx 1 xrootd atlas 4096 Mar 19 14:38 test
</file>