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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Virtualization rocks!  No problems in our
production environment.  I strongly suggest it for any website, unless you’re
hosting Google or Yahoo.  <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>We’re using VMware’s ESX 3.0  in
production.  I have 37 production VMs spread across 4 ESX3 hosts.  We also have
a SAN which allows us to VMotion (hot migrate) running VMs from server to
server.  Most of my VMs are Windows but I do have 3 linux VMs with CentOS 4.3
running pound and mongrel, as well as MySQL.  Everything is running very well. 
If you don’t have the cash for ESX 3, you might consider running VMware Server. 
VMWare Server is free, but the performance is less and you can’t get as
many VMs on a single box and no Vmotion </span></font><font size=2 color=navy
face=Wingdings><span style='font-size:10.0pt;font-family:Wingdings;color:navy'>L</span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The biggest benefit we see from the VMware
is Disaster Recovery options available.  I also love using the snapshot feature
prior to major software upgrades.  If the upgrade introduces major errors, you
can then shutdown the VM, revert to the earlier snapshot.  <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The one problem I had initially was with
time keeping.  The below link is what fixed my problems.  <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>KB Doc ID: 1420 is recommended reading for
time sync issues with Linux guest on vmware. <a
href="http://kb.vmware.com/vmtnkb/search.do?cmd=displayKC&docType=kc&externalId=1420&sliceId=SAL_Public">http://kb.vmware.com/vmtnkb/search.do?cmd=displayKC&docType=kc&externalId=1420&sliceId=SAL_Public</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In addition to instructions in the above
KB document, I also needed to add a one line script to  /etc/cron.hourly/,  “ntpdate
myntpserver.mydomain.com”.  This corrects the remaining 1-2 seconds that I’m
ahead each hour.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> mongrel-users-bounces@rubyforge.org
[mailto:mongrel-users-bounces@rubyforge.org] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Thibaut Barrère<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, October 02, 2006
6:41 AM<br>
<b><span style='font-weight:bold'>To:</span></b> mongrel-users@rubyforge.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Mongrel] [Slightly OT]
Do you use virtualization in production ?</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hi!<br>
<br>
I've been using parallels, vmware player, or virtual pc (did not try xen yet)
for development, testing and experimenting with new platforms (and I must say I
love them - copy paste a few files, and I have a clean deployment box etc) <br>
<br>
Since the RailsConf and various talks I've seen (like Jason Hoffmann's <a
href="http://svn.joyent.com/public/JasonHoffman-EuroRailsConf.pdf">http://svn.joyent.com/public/JasonHoffman-EuroRailsConf.pdf</a>
, or James Duncan Davidson), I'm willing to apply the benefits to production. <br>
<br>
is there anyone here actually using virtualization techniques in production ?
(even for single machine setups?)<br>
<br>
any feedback would be most welcome!<br>
<br>
thanks!<br>
<br>
Thibaut<o:p></o:p></span></font></p>
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