THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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These values are taken from guest_os_category table in cloud DB of CloudStack.
guestos : CentOS, Debian, Oracle, RedHat, SUSE, Windows, Other, Novel, Unix, Ubuntu, None
These values are taken from display_name column in guest_os table. To see current list of guest os available refer the CloudStack documents. Or this can be seen from os Type in template details or while registering template
CentOS 4.5 (32-bit)
CentOS 4.6 (32-bit)
CentOS 4.7 (32-bit)
CentOS 4.8 (32-bit)
CentOS 5.0 (32-bit)
CentOS 5.0 (64-bit)
CentOS 5.1 (32-bit)
CentOS 5.1 (64-bit)
CentOS 5.2 (32-bit)
CentOS 5.2 (64-bit)
CentOS 5.3 (32-bit)
CentOS 5.3 (64-bit)
CentOS 5.4 (32-bit)
CentOS 5.4 (64-bit)
Debian GNU/Linux 5.0 (64-bit)
Oracle Enterprise Linux 5.0 (32-bit)
Oracle Enterprise Linux 5.0 (64-bit)
Oracle Enterprise Linux 5.1 (32-bit)
Oracle Enterprise Linux 5.1 (64-bit)
Oracle Enterprise Linux 5.2 (32-bit)
Oracle Enterprise Linux 5.2 (64-bit)
Oracle Enterprise Linux 5.3 (32-bit)
Oracle Enterprise Linux 5.3 (64-bit)
Oracle Enterprise Linux 5.4 (32-bit)
Oracle Enterprise Linux 5.4 (64-bit)
Red Hat Enterprise Linux 4.5 (32-bit)
Red Hat Enterprise Linux 4.6 (32-bit)
Red Hat Enterprise Linux 4.7 (32-bit)
Red Hat Enterprise Linux 4.8 (32-bit)
Red Hat Enterprise Linux 5.0 (32-bit)
Red Hat Enterprise Linux 5.0 (64-bit)
Red Hat Enterprise Linux 5.1 (32-bit)
Red Hat Enterprise Linux 5.1 (64-bit)
Red Hat Enterprise Linux 5.2 (32-bit)
Red Hat Enterprise Linux 5.2 (64-bit)
Red Hat Enterprise Linux 5.3 (32-bit)
Red Hat Enterprise Linux 5.3 (64-bit)
Red Hat Enterprise Linux 5.4 (32-bit)
Red Hat Enterprise Linux 5.4 (64-bit)
SUSE Linux Enterprise Server 9 SP4 (32-bit)
SUSE Linux Enterprise Server 10 SP1 (32-bit)
SUSE Linux Enterprise Server 10 SP1 (64-bit)
SUSE Linux Enterprise Server 10 SP2 (32-bit)
SUSE Linux Enterprise Server 10 SP2 (64-bit)
SUSE Linux Enterprise Server 10 SP3 (64-bit)
SUSE Linux Enterprise Server 11 (32-bit)
SUSE Linux Enterprise Server 11 (64-bit)
Windows 7 (32-bit)
Windows 7 (64-bit)
Windows Server 2003 Enterprise Edition(32-bit)
Windows Server 2003 Enterprise Edition(64-bit)
Windows Server 2008 (32-bit)
Windows Server 2008 (64-bit)
Windows Server 2008 R2 (64-bit)
Windows 2000 Server SP4 (32-bit)
Windows Vista (32-bit)
Windows XP SP2 (32-bit)
Windows XP SP3 (32-bit)
Other Ubuntu (32-bit)
Other (32-bit)
Windows 2000 Server
Windows 98
Windows 95
Windows NT 4
Windows 3.1
Red Hat Enterprise Linux 3(32-bit)
Red Hat Enterprise Linux 3(64-bit)
Open Enterprise Server
Asianux 3(32-bit)
Asianux 3(64-bit)
Debian GNU/Linux 5(64-bit)
Debian GNU/Linux 4(32-bit)
Debian GNU/Linux 4(64-bit)
Other 2.6x Linux (32-bit)
Other 2.6x Linux (64-bit)
Novell Netware 6.x
Novell Netware 5.1
Sun Solaris 10(32-bit)
Sun Solaris 10(64-bit)
Sun Solaris 9(Experimental)
Sun Solaris 8(Experimental)
FreeBSD (32-bit)
FreeBSD (64-bit)
SCO OpenServer 5
SCO UnixWare 7
Windows Server 2003 DataCenter Edition(32-bit)
Windows Server 2003 DataCenter Edition(64-bit)
Windows Server 2003 Standard Edition(32-bit)
Windows Server 2003 Standard Edition(64-bit)
Windows Server 2003 Web Edition
Microsoft Small Bussiness Server 2003
Windows XP (32-bit)
Windows XP (64-bit)
Windows 2000 Advanced Server
SUSE Linux Enterprise 8(32-bit)
SUSE Linux Enterprise 8(64-bit)
Other Linux (32-bit)
Other Linux (64-bit)
Other Ubuntu (64-bit)
Windows Vista (64-bit)
DOS
Other (64-bit)
OS/2
Windows 2000 Professional
Red Hat Enterprise Linux 4(64-bi
SUSE Linux Enterprise 9(32-bit)
SUSE Linux Enterprise 9(64-bit)
SUSE Linux Enterprise 10(32-bit)
SUSE Linux Enterprise 10(64-bit)
CentOS 5.5 (32-bit)
CentOS 5.5 (64-bit)
Red Hat Enterprise Linux 5.5 (32-bit)
Red Hat Enterprise Linux 5.5 (64-bit)
Fedora 13
Fedora 12
Fedora 11
Fedora 10
Fedora 9
Fedora 8
Ubuntu 10.04 (32-bit)
Ubuntu 9.10 (32-bit)
Ubuntu 9.04 (32-bit)
Ubuntu 8.10 (32-bit)
Ubuntu 8.04 (32-bit)
Ubuntu 10.04 (64-bit)
Ubuntu 9.10 (64-bit)
Ubuntu 9.04 (64-bit)
Ubuntu 8.10 (64-bit)
Ubuntu 8.04 (64-bit)
Red Hat Enterprise Linux 2
Debian GNU/Linux 6(32-bit)
Debian GNU/Linux 6(64-bit)
Oracle Enterprise Linux 5.5 (32-bit)
Oracle Enterprise Linux 5.5 (64-bit)
Red Hat Enterprise Linux 6.0 (32-bit)
Red Hat Enterprise Linux 6.0 (64-bit)
None
Other PV (32-bit)
Other PV (64-bit)
CentOS 5.6 (32-bit)
CentOS 5.6 (64-bit)
CentOS 6.0 (32-bit)
CentOS 6.0 (64-bit)
Oracle Enterprise Linux 5.6 (32-bit)
Oracle Enterprise Linux 5.6 (64-bit)
Oracle Enterprise Linux 6.0 (32-bit)
Oracle Enterprise Linux 6.0 (64-bit)
Red Hat Enterprise Linux 5.6 (32-bit)
Red Hat Enterprise Linux 5.6 (64-bit)
SUSE Linux Enterprise Server 10 SP3 (32-bit)
SUSE Linux Enterprise Server 10 SP4 (64-bit)
SUSE Linux Enterprise Server 10 SP4 (32-bit)
SUSE Linux Enterprise Server 11 SP1 (64-bit)
SUSE Linux Enterprise Server 11 SP1 (32-bit)
Ubuntu 10.10 (32-bit)
Ubuntu 10.10 (64-bit)
Sun Solaris 11 (64-bit)
Sun Solaris 11 (32-bit)
Windows PV
CentOS 5.7 (32-bit)
CentOS 5.7 (64-bit)
Ubuntu 12.04 (32-bit)
Ubuntu 12.04 (64-bit)
Windows 8 (32-bit)
Windows 8 (64-bit)
Windows Server 2012 (64-bit)
Windows Server 2012 R2 (64-bit)
Ubuntu 11.04 (32-bit)
Ubuntu 11.04 (64-bit)
CentOS 6.3 (32-bit)
CentOS 6.3 (64-bit)
CentOS 5.8 (32-bit)
CentOS 5.8 (64-bit)
CentOS 5.9 (32-bit)
CentOS 5.9 (64-bit)
CentOS 6.1 (32-bit)
CentOS 6.1 (64-bit)
CentOS 6.2 (32-bit)
CentOS 6.2 (64-bit)
CentOS 6.4 (32-bit)
CentOS 6.4 (64-bit)
Debian GNU/Linux 7(32-bit)
Debian GNU/Linux 7(64-bit)
SUSE Linux Enterprise Server 11 SP2 (64-bit)
SUSE Linux Enterprise Server 11 SP2 (32-bit)
SUSE Linux Enterprise Server 11 SP3 (64-bit)
SUSE Linux Enterprise Server 11 SP3 (32-bit)
Red Hat Enterprise Linux 5.7 (32-bit)
Red Hat Enterprise Linux 5.7 (64-bit)
Red Hat Enterprise Linux 5.8 (32-bit)
Red Hat Enterprise Linux 5.8 (64-bit)
Red Hat Enterprise Linux 5.9 (32-bit)
Red Hat Enterprise Linux 5.9 (64-bit)
Red Hat Enterprise Linux 6.1 (32-bit)
Red Hat Enterprise Linux 6.1 (64-bit)
Red Hat Enterprise Linux 6.2 (32-bit)
Red Hat Enterprise Linux 6.2 (64-bit)
Red Hat Enterprise Linux 6.3 (32-bit)
Other CentOS (32-bit)
Other CentOS (64-bit)
Other SUSE Linux(32-bit)
Other SUSE Linux(64-bit)
Red Hat Enterprise Linux
Red Hat Enterprise Linux
Red Hat Enterprise Linux
Oracle Enterprise Linux 5.7 (32-bit)
Oracle Enterprise Linux 5.7 (64-bit)
Oracle Enterprise Linux 5.8 (32-bit)
Oracle Enterprise Linux 5.8 (64-bit)
Oracle Enterprise Linux 5.9 (32-bit)
Oracle Enterprise Linux 5.9 (64-bit)
Oracle Enterprise Linux 6.1 (32-bit)
Oracle Enterprise Linux 6.1 (64-bit)
Oracle Enterprise Linux 6.2 (32-bit)
Oracle Enterprise Linux 6.2 (64-bit)
Oracle Enterprise Linux 6.3 (32-bit)
Oracle Enterprise Linux 6.3 (64-bit)
Oracle Enterprise Linux 6.4 (32-bit)
Oracle Enterprise Linux 6.4 (64-bit)
Apple Mac OS X 10.6 (32-bit)
Apple Mac OS X 10.6 (64-bit)
Apple Mac OS X 10.7 (32-bit)
Apple Mac OS X 10.7 (64-bit)
FreeBSD 10 (32-bit)
FreeBSD 10 (64-bit)
CentOS 6.5 (32-bit)
CentOS 6.5 (64-bit)
Windows 8.1 (64-bit)
Windows 8.1 (32-bit)
CentOS 5 (32-bit)
CentOS 5 (64-bit)
Oracle Enterprise Linux 5 (32-bit)
Oracle Enterprise Linux 5 (64-bit)
Oracle Enterprise Linux 6 (32-bit)
Oracle Enterprise Linux 6 (64-bit)
Red Hat Enterprise Linux 5 (32-bit)
Red Hat Enterprise Linux 5 (64-bit)
Red Hat Enterprise Linux 6 (32-bit)
Red Hat Enterprise Linux 6 (64-bit)
Ubuntu 14.04 (32-bit)
SUSE Linux Enterprise Server 12 (64-bit)
Red Hat Enterprise Linux 7
CentOS 7
Oracle Linux 7
CentOS 6 (32-bit)
CentOS 6 (64-bit)
Oracle Enterprise Linux 6.5 (32-bit)
Oracle Enterprise Linux 6.5 (64-bit)
Red Hat Enterprise Linux 6.5 (32-bit)
Red Hat Enterprise Linux 6.5 (64-bit)
Ubuntu 14.04 (64-bit)
CoreOS