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docs: split out sanlock setup docs

Browse Source 
In preparation for adding docs about virtlockd, split out
the sanlock setup docs into a separate page.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2015-02-13 17:02:44 +00:00
parent 77a9dc0b8d
commit 575c839b6e
3 changed files with 284 additions and 242 deletions
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<h1>Virtual machine lock manager, sanlock plugin</h1>
<ul id="toc"></ul>
<p>
This page describes use of the
<a href="https://fedorahosted.org/sanlock/">sanlock</a>
service as a <a href="locking.html">lock driver</a>
plugin for virtual machine disk mutual exclusion.
</p>
<h2><a name="sanlock">Sanlock daemon setup</a></h2>
<p>
On many operating systems, the <strong>sanlock</strong> plugin
is distributed in a sub-package which needs to be installed
separately from the main libvirt RPM. On a Fedora/RHEL host
this can be done with the <code>yum</code> command
</p>
<pre>
$ su - root
# yum install libvirt-lock-sanlock
</pre>
<p>
The next step is to start the sanlock daemon. For maximum
safety sanlock prefers to have a connection to a watchdog
daemon. This will cause the entire host to be rebooted in
the event that sanlock crashes / terminates abnormally.
To start the watchdog daemon on a Fedora/RHEL host
the following commands can be run:
</p>
<pre>
$ su - root
# chkconfig wdmd on
# service wdmd start
</pre>
<p>
Once the watchdog is running, sanlock can be started
as follows
</p>
<pre>
# chkconfig sanlock on
# service sanlock start
</pre>
<p>
<em>Note:</em> if you wish to avoid the use of the
watchdog, add the following line to <code>/etc/sysconfig/sanlock</code>
before starting it
</p>
<pre>
SANLOCKOPTS="-w 0"
</pre>
<p>
The sanlock daemon must be started on every single host
that will be running virtual machines. So repeat these
steps as necessary.
</p>
<h2><a name="sanlockplugin">libvirt sanlock plugin configuration</a></h2>
<p>
Once the sanlock daemon is running, the next step is to
configure the libvirt sanlock plugin. There is a separate
configuration file for each libvirt driver that is using
sanlock. For QEMU, we will edit <code>/etc/libvirt/qemu-sanlock.conf</code>
There is one mandatory parameter that needs to be set,
the <code>host_id</code>. This is a integer between
1 and 2000, which must be set to a <strong>unique</strong>
value on each host running virtual machines.
</p>
<pre>
$ su - root
# augtool -s set /files/etc/libvirt/qemu-sanlock.conf/host_id 1
</pre>
<p>
Repeat this on every host, changing <strong>1</strong> to a
unique value for the host.
</p>
<h2><a name="sanlockstorage">libvirt sanlock storage configuration</a></h2>
<p>
The sanlock plugin needs to create leases in a directory
that is on a filesystem shared between all hosts running
virtual machines. Obvious choices for this include NFS
or GFS2. The libvirt sanlock plugin expects its lease
directory be at <code>/var/lib/libvirt/sanlock</code>
so update the host's <code>/etc/fstab</code> to mount
a suitable shared/cluster filesystem at that location
</p>
<pre>
$ su - root
# echo "some.nfs.server:/export/sanlock /var/lib/libvirt/sanlock nfs hard,nointr 0 0" >> /etc/fstab
# mount /var/lib/libvirt/sanlock
</pre>
<p>
If your sanlock daemon happen to run under non-root
privileges, you need to tell this to libvirt so it
chowns created files correctly. This can be done by
setting <code>user</code> and/or <code>group</code>
variables in the configuration file. Accepted values
range is specified in description to the same
variables in <code>/etc/libvirt/qemu.conf</code>. For
example:
</p>
<pre>
augtool -s set /files/etc/libvirt/qemu-sanlock.conf/user sanlock
augtool -s set /files/etc/libvirt/qemu-sanlock.conf/group sanlock
</pre>
<p>
But remember, that if this is NFS share, you need a
no_root_squash-ed one for chown (and chmod possibly)
to succeed.
</p>
<p>
In terms of storage requirements, if the filesystem
uses 512 byte sectors, you need to allow for <code>1MB</code>
of storage for each guest disk. So if you have a network
with 20 virtualization hosts, each running 50 virtual
machines and an average of 2 disks per guest, you will
need <code>20*50*2 == 2000 MB</code> of storage for
sanlock.
</p>
<p>
On one of the hosts on the network is it wise to setup
a cron job which runs the <code>virt-sanlock-cleanup</code>
script periodically. This scripts deletes any lease
files which are not currently in use by running virtual
machines, freeing up disk space on the shared filesystem.
Unless VM disks are very frequently created + deleted
it should be sufficient to run the cleanup once a week.
</p>
<h2><a name="qemuconfig">QEMU/KVM driver configuration</a></h2>
<p>
The QEMU/KVM driver is fully integrated with the lock
manager framework as of release <span>0.9.3</span>.
The out of the box configuration, however, currently
uses the <strong>nop</strong> lock manager plugin.
To get protection for disks, it is thus necessary
to reconfigure QEMU to activate the <strong>sanlock</strong>
driver. This is achieved by editing the QEMU driver
configuration file (<code>/etc/libvirt/qemu.conf</code>)
and changing the <code>lock_manager</code> configuration
tunable.
</p>
<pre>
$ su - root
# augtool -s set /files/etc/libvirt/qemu.conf/lock_manager sanlock
# service libvirtd restart
</pre>
<p>
If all went well, libvirtd will have talked to sanlock
and created the basic lockspace. This can be checked
by looking for existence of the following file
</p>
<pre>
# ls /var/lib/libvirt/sanlock/
__LIBVIRT__DISKS__
</pre>
<p>
Every time you start a guest, additional lease files will appear
in this directory, one for each virtual disk. The lease
files are named based on the MD5 checksum of the fully qualified
path of the virtual disk backing file. So if the guest is given
a disk backed by <code>/var/lib/libvirt/images/demo.img</code>
expect to see a lease <code>/var/lib/libvirt/sanlock/bfa0240911bc17753e0b473688822159</code>
</p>
<p>
It should be obvious that for locking to work correctly, every
host running virtual machines should have storage configured
in the same way. The easiest way to do this is to use the libvirt
storage pool capability to configure any NFS volumes, iSCSI targets,
or SCSI HBAs used for guest storage. Simply replicate the same
storage pool XML across every host. It is important that any
storage pools exposing block devices are configured to create
volume paths under <code>/dev/disks/by-path</code> to ensure
stable paths across hosts. An example iSCSI configuration
which ensures this is:
</p>
<pre>
&lt;pool type='iscsi'&gt;
&lt;name&gt;myiscsipool&lt;/name&gt;
&lt;source&gt;
&lt;host name='192.168.254.8'/&gt;
&lt;device path='your-iscsi-target-iqn'/&gt;
&lt;/source&gt;
&lt;target&gt;
&lt;path&gt;/dev/disk/by-path&lt;/path&gt;
&lt;/target&gt;
&lt;/pool&gt;
</pre>
<h2><a name="domainconfig">Domain configuration</a></h2>
<p>
In case sanlock loses access to disk locks for some reason, it will
kill all domains that lost their locks. This default behavior may
be changed using
<a href="formatdomain.html#elementsEvents">on_lockfailure
element</a> in domain XML. When this element is present, sanlock
will call <code>sanlock_helper</code> (provided by libvirt) with
the specified action. This helper binary will connect to libvirtd
and thus it may need to authenticate if libvirtd was configured to
require that on the read-write UNIX socket. To provide the
appropriate credentials to sanlock_helper, a
<a href="auth.html#Auth_client_config">client authentication
file</a> needs to contain something like the following:
</p>
<pre>
[auth-libvirt-localhost]
credentials=sanlock
[credentials-sanlock]
authname=login
password=password
</pre>
</body>
</html>

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<h1>Virtual machine disk locking</h1>
<h1>Virtual machine lock manager</h1>
<ul id="toc"></ul>
<p>
This page describes how to ensure a single disk cannot be
used by more than one running VM at a time, across any
host in a network. This is critical to avoid data corruption
of guest files systems that are not cluster aware.
Libvirt includes a framework for ensuring mutual exclusion
between virtual machines using host resources. Typically
this is used to prevent two VM processes from having concurrent
write access to the same disk image, as this would result in
data corruption if the guest was not using a cluster
aware filesystem.
</p>
<h2><a name="plugins">Lock manager plugins</a></h2>
<p>
libvirt includes a pluggable framework for lock managers,
which hypervisor drivers can use to ensure safety for
guest domain disks, and potentially other resources.
At this time there are only two plugin implementations,
a "no op" implementation which does absolutely nothing,
and a <a href="https://fedorahosted.org/sanlock/">sanlock</a> implementation which uses
the Disk Paxos algorithm to ensure safety.
The lock manager framework has a pluggable architecture,
to allow different locking technologies to be used.
</p>
<h2><a name="sanlock">Sanlock daemon setup</a></h2>
<p>
On many operating systems, the <strong>sanlock</strong> plugin
is distributed in a sub-package which needs to be installed
separately from the main libvirt RPM. On a Fedora/RHEL host
this can be done with the <code>yum</code> command
</p>
<pre>
$ su - root
# yum install libvirt-lock-sanlock
</pre>
<p>
The next step is to start the sanlock daemon. For maximum
safety sanlock prefers to have a connection to a watchdog
daemon. This will cause the entire host to be rebooted in
the event that sanlock crashes / terminates abnormally.
To start the watchdog daemon on a Fedora/RHEL host
the following commands can be run:
</p>
<pre>
$ su - root
# chkconfig wdmd on
# service wdmd start
</pre>
<p>
Once the watchdog is running, sanlock can be started
as follows
</p>
<pre>
# chkconfig sanlock on
# service sanlock start
</pre>
<p>
<em>Note:</em> if you wish to avoid the use of the
watchdog, add the following line to <code>/etc/sysconfig/sanlock</code>
before starting it
</p>
<pre>
SANLOCKOPTS="-w 0"
</pre>
<p>
The sanlock daemon must be started on every single host
that will be running virtual machines. So repeat these
steps as necessary.
</p>
<h2><a name="sanlockplugin">libvirt sanlock plugin configuration</a></h2>
<p>
Once the sanlock daemon is running, the next step is to
configure the libvirt sanlock plugin. There is a separate
configuration file for each libvirt driver that is using
sanlock. For QEMU, we will edit <code>/etc/libvirt/qemu-sanlock.conf</code>
There is one mandatory parameter that needs to be set,
the <code>host_id</code>. This is a integer between
1 and 2000, which must be set to a <strong>unique</strong>
value on each host running virtual machines.
</p>
<pre>
$ su - root
# augtool -s set /files/etc/libvirt/qemu-sanlock.conf/host_id 1
</pre>
<p>
Repeat this on every host, changing <strong>1</strong> to a
unique value for the host.
</p>
<h2><a name="sanlockstorage">libvirt sanlock storage configuration</a></h2>
<p>
The sanlock plugin needs to create leases in a directory
that is on a filesystem shared between all hosts running
virtual machines. Obvious choices for this include NFS
or GFS2. The libvirt sanlock plugin expects its lease
directory be at <code>/var/lib/libvirt/sanlock</code>
so update the host's <code>/etc/fstab</code> to mount
a suitable shared/cluster filesystem at that location
</p>
<pre>
$ su - root
# echo "some.nfs.server:/export/sanlock /var/lib/libvirt/sanlock nfs hard,nointr 0 0" >> /etc/fstab
# mount /var/lib/libvirt/sanlock
</pre>
<p>
If your sanlock daemon happen to run under non-root
privileges, you need to tell this to libvirt so it
chowns created files correctly. This can be done by
setting <code>user</code> and/or <code>group</code>
variables in the configuration file. Accepted values
range is specified in description to the same
variables in <code>/etc/libvirt/qemu.conf</code>. For
example:
</p>
<pre>
augtool -s set /files/etc/libvirt/qemu-sanlock.conf/user sanlock
augtool -s set /files/etc/libvirt/qemu-sanlock.conf/group sanlock
</pre>
<p>
But remember, that if this is NFS share, you need a
no_root_squash-ed one for chown (and chmod possibly)
to succeed.
</p>
<p>
In terms of storage requirements, if the filesystem
uses 512 byte sectors, you need to allow for <code>1MB</code>
of storage for each guest disk. So if you have a network
with 20 virtualization hosts, each running 50 virtual
machines and an average of 2 disks per guest, you will
need <code>20*50*2 == 2000 MB</code> of storage for
sanlock.
</p>
<p>
On one of the hosts on the network is it wise to setup
a cron job which runs the <code>virt-sanlock-cleanup</code>
script periodically. This scripts deletes any lease
files which are not currently in use by running virtual
machines, freeing up disk space on the shared filesystem.
Unless VM disks are very frequently created + deleted
it should be sufficient to run the cleanup once a week.
</p>
<h2><a name="qemuconfig">QEMU/KVM driver configuration</a></h2>
<p>
The QEMU/KVM driver is fully integrated with the lock
manager framework as of release <span>0.9.3</span>.
The out of the box configuration, however, currently
uses the <strong>nop</strong> lock manager plugin.
To get protection for disks, it is thus necessary
to reconfigure QEMU to activate the <strong>sanlock</strong>
driver. This is achieved by editing the QEMU driver
configuration file (<code>/etc/libvirt/qemu.conf</code>)
and changing the <code>lock_manager</code> configuration
tunable.
</p>
<pre>
$ su - root
# augtool -s set /files/etc/libvirt/qemu.conf/lock_manager sanlock
# service libvirtd restart
</pre>
<p>
If all went well, libvirtd will have talked to sanlock
and created the basic lockspace. This can be checked
by looking for existence of the following file
</p>
<pre>
# ls /var/lib/libvirt/sanlock/
__LIBVIRT__DISKS__
</pre>
<p>
Every time you start a guest, additional lease files will appear
in this directory, one for each virtual disk. The lease
files are named based on the MD5 checksum of the fully qualified
path of the virtual disk backing file. So if the guest is given
a disk backed by <code>/var/lib/libvirt/images/demo.img</code>
expect to see a lease <code>/var/lib/libvirt/sanlock/bfa0240911bc17753e0b473688822159</code>
</p>
<p>
It should be obvious that for locking to work correctly, every
host running virtual machines should have storage configured
in the same way. The easiest way to do this is to use the libvirt
storage pool capability to configure any NFS volumes, iSCSI targets,
or SCSI HBAs used for guest storage. Simply replicate the same
storage pool XML across every host. It is important that any
storage pools exposing block devices are configured to create
volume paths under <code>/dev/disks/by-path</code> to ensure
stable paths across hosts. An example iSCSI configuration
which ensures this is:
</p>
<pre>
&lt;pool type='iscsi'&gt;
&lt;name&gt;myiscsipool&lt;/name&gt;
&lt;source&gt;
&lt;host name='192.168.254.8'/&gt;
&lt;device path='your-iscsi-target-iqn'/&gt;
&lt;/source&gt;
&lt;target&gt;
&lt;path&gt;/dev/disk/by-path&lt;/path&gt;
&lt;/target&gt;
&lt;/pool&gt;
</pre>
<h2><a name="domainconfig">Domain configuration</a></h2>
<p>
In case sanlock loses access to disk locks for some reason, it will
kill all domains that lost their locks. This default behavior may
be changed using
<a href="formatdomain.html#elementsEvents">on_lockfailure
element</a> in domain XML. When this element is present, sanlock
will call <code>sanlock_helper</code> (provided by libvirt) with
the specified action. This helper binary will connect to libvirtd
and thus it may need to authenticate if libvirtd was configured to
require that on the read-write UNIX socket. To provide the
appropriate credentials to sanlock_helper, a
<a href="auth.html#Auth_client_config">client authentication
file</a> needs to contain something like the following:
</p>
<pre>
[auth-libvirt-localhost]
credentials=sanlock
[credentials-sanlock]
authname=login
password=password
</pre>
<dl>
<dt>nop</dt>
<dd>This is a "no op" implementation which does absolutely
nothing. This can be used if mutual exclusion between
virtual machines is not required, or if it is being
solved at another level in the management stack.</dd>
<dt>lockd</dt>
<dd>This is the current preferred implementation shipped
with libvirt. It uses the <code>virtlockd</code> daemon
to manage locks using the POSIX fcntl() advisory locking
capability. As such it requires a shared filesystem of
some kind be accessible to all hosts which share the
same image storage.</dd>
<dt><a href="locking-sanlock.html">sanlock</a></dt>
<dd>This is an alternative implementation preferred by
the oVirt project. It uses a disk paxos algorithm for
maintaining continuously renewed leases. In the default
setup it requires some shared filesystem, but it is
possible to use it in a manual mode where the management
application creates leases in SAN storage volumes.
</dd>
</dl>
</body>
</html>

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<li>
<a href="locking.html">Disk locking</a>
<span>Ensuring exclusive guest access to disks</span>
<ul>
<li>
<a href="locking-sanlock.html">Sanlock</a>
<span>Sanlock lock manager plugin</span>
</li>
</ul>
</li>
<li>
<a href="cgroups.html">CGroups</a>