openstack/openstack-manuals
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Added instructions for GlusterFS share removal

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Removing a GlusterFS share is not as simple as deleting its entry from
the shares file. This patch adds instructions on how to gracefully
and safely do so.

Change-Id: I50fd39dfcb147de42c9295ceae64e55b56aeb265
Partial-Bug: #1279179
This commit is contained in:
Don Domingo 2014-02-25 16:03:27 +10:00
parent 57c4cafa78
commit 9b1d396be9
2 changed files with 35 additions and 0 deletions
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1
doc/admin-guide-cloud/ch_blockstorage.xml
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@ -119,6 +119,7 @@
<xi:include href="section_multi_backend.xml"/>
<xi:include href="section_backup-block-storage-disks.xml"/>
<xi:include href="section_volume-migration.xml"/>
<xi:include href="section_glusterfs_removal.xml"/>
</section>
<section xml:id="troubleshooting-cinder-install">
<title>Troubleshoot your installation</title>

34
doc/admin-guide-cloud/section_glusterfs_removal.xml Normal file
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@ -0,0 +1,34 @@
<?xml version="1.0" encoding="UTF-8"?>
<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0"
xml:id="section_gluster_removal_gracefully">
<title>Gracefully remove a GlusterFS volume from usage</title>
<para>Configuring the <systemitem>cinder</systemitem> volume
service to use GlusterFS involves creating a shares file (for
example, <filename>/etc/cinder/glusterfs</filename>). This
shares file lists each GlusterFS volume (with its
corresponding storage server) that the
<systemitem>cinder</systemitem> volume service can use for
back end storage.</para>
<para>To remove a GlusterFS volume from usage as a back end,
delete the volume's corresponding entry from the shares file.
After doing so, restart the Block Storage services.</para>
<para os="rhel;centos;fedora;opensuse;sles">To restart the
Block Storage services on CentOS, Fedora, openSUSE, Red Hat
Enterprise Linux, or SUSE Linux Enterprise, run:</para>
<screen os="rhel;centos;fedora;opensuse;sles"><prompt>#</prompt> <userinput>for i in api scheduler volume; do service openstack-cinder-$i restart; done</userinput></screen>
<para os="debian;ubuntu">To restart the Block Storage services
on Ubuntu or Debian, run:</para>
<screen os="debian;ubuntu"><prompt>#</prompt> <userinput>for i in api scheduler volume; do service cinder-${i} restart; done</userinput></screen>
<para>Restarting the Block Storage services will prevent
the <systemitem>cinder</systemitem> volume service from
exporting the deleted GlusterFS volume. This will prevent
any instances from mounting the volume from that point
onwards.</para>
<para>However, the removed GlusterFS volume might still be
mounted on an instance at this point. Typically, this is the
case when the volume was already mounted while its entry was
deleted from the shares file. Whenever this occurs, you
will have to unmount the volume as normal after the Block
Storage services are restarted.</para>
</section>