<s>
Red	B-Operating_System
Hat	I-Operating_System
Network	I-Operating_System
(	O
abbreviated	O
to	O
RHN	O
)	O
is	O
a	O
family	O
of	O
systems-management	O
services	O
operated	O
by	O
Red	O
Hat	O
.	O
</s>
<s>
RHN	O
makes	O
updates	O
,	O
patches	O
,	O
and	O
bug	B-Error_Name
fixes	O
of	O
packages	O
included	O
within	O
Red	O
Hat	O
Linux	O
and	O
Red	O
Hat	O
Enterprise	O
Linux	O
available	O
to	O
subscribers	O
.	O
</s>
<s>
Users	O
of	O
these	O
operating	B-General_Concept
systems	I-General_Concept
can	O
then	O
invoke	O
the	O
up2date	B-Application
or	O
yum	B-Application
program	O
to	O
download	O
and	O
install	O
updates	O
from	O
RHN	O
.	O
</s>
<s>
The	O
updates	O
portion	O
of	O
RHN	O
is	O
akin	O
to	O
other	O
types	O
of	O
automatic	O
system	O
maintenance	O
tools	O
such	O
as	O
Microsoft	O
Update	O
for	O
Microsoft	B-Application
Windows	I-Application
operating	I-Application
systems	I-Application
.	O
</s>
<s>
On	O
June	O
18	O
,	O
2008	O
,	O
Red	O
Hat	O
CEO	B-Application
Jim	O
Whitehurst	O
announced	O
plans	O
for	O
the	O
RHN	O
Satellite	O
software	O
to	O
be	O
open-sourced	O
following	O
the	O
Fedora/RHEL	O
model	O
.	O
</s>
<s>
Subsequently	O
,	O
project	O
Spacewalk	B-Language
was	O
launched	O
.	O
</s>
<s>
Red	O
Hat	O
offers	O
a	O
proxy	B-Application
server	I-Application
(	O
Red	B-Operating_System
Hat	I-Operating_System
Network	I-Operating_System
Proxy	O
)	O
that	O
once	O
installed	O
at	O
a	O
site	O
allows	O
machines	O
to	O
securely	O
download	O
updates	O
locally	O
.	O
</s>
<s>
the	O
RHN	O
Proxy	B-Application
Server	I-Application
costs	O
$	O
2,500	O
annually	O
,	O
and	O
the	O
RHN	O
Satellite	O
Server	O
costs	O
$	O
13,500	O
annually	O
,	O
which	O
includes	O
the	O
license	O
for	O
the	O
embedded	O
Oracle	B-General_Concept
Database	I-General_Concept
.	O
</s>
<s>
Date	O
Version	O
Description	O
late	O
2000	O
Red	B-Operating_System
Hat	I-Operating_System
Network	I-Operating_System
is	O
born	O
as	O
hosted	O
service	O
.	O
</s>
<s>
late	O
2001	O
RHN	O
Proxy	B-Application
Server	I-Application
has	O
been	O
created	O
.	O
</s>
<s>
October	O
2002	O
Red	O
Hat	O
purchased	O
Sunnyvale	O
company	O
and	O
integrate	O
its	O
NOCpulse	O
Command	O
Center	O
systems	O
management	O
software	O
into	O
RHN	O
2004	O
RHN	O
3.2	O
released	O
introducing	O
provisioning	O
,	O
Bootstrap	O
Script	O
,	O
Refined	O
Channel	O
Cloning	O
Spring	O
2004	O
RHN	O
3.3	O
released	O
July	O
20	O
,	O
2004	O
RHN	O
3.4	O
released	O
December	O
15	O
,	O
2004	O
RHN	O
3.6	O
released	O
introducing	O
Monitoring	O
as	O
technology	O
preview	O
,	O
supporting	O
Red	O
Hat	O
Enterprise	O
Linux	O
AS	O
3	O
as	O
base	O
operating	B-General_Concept
system	I-General_Concept
,	O
rhn	O
boostrap	O
utility	O
and	O
push	O
technology	O
(	O
using	O
jabber	O
protocol	O
)	O
March	O
22	O
,	O
2005	O
RHN	O
3.7	O
released	O
August	O
31	O
,	O
2005	O
RHN	O
4.0	O
released	O
February	O
2	O
,	O
2007	O
RHN	O
Satellite	O
4.2	O
released	O
supporting	O
Red	O
Hat	O
Enterprise	O
Linux	O
5	O
clients	O
June	O
26	O
,	O
2007	O
RHN	O
Satellite	O
5.0	O
released	O
introducing	O
virtualization	O
management	O
support	O
.	O
</s>
<s>
Project	O
Spacewalk	B-Language
is	O
born	O
.	O
</s>
<s>
November	O
5	O
,	O
2008	O
RHN	O
Satellite	O
5.2	O
released	O
Red	O
Hat	O
Enterprise	O
Linux	O
5	O
is	O
now	O
supported	O
as	O
a	O
base	O
operating	B-General_Concept
system	I-General_Concept
,	O
introducing	O
Oracle	B-General_Concept
10g	O
support	O
.	O
</s>
<s>
October	O
27	O
,	O
2010	O
RHN	O
Satellite	O
5.4	O
released	O
supporting	O
Red	O
Hat	O
Enterprise	O
Linux	O
6	O
clients	O
,	O
introducing	O
spacewalk-repo-sync	O
,	O
Duplicate	O
Profile	O
feature	O
,	O
Support	O
for	O
Oracle	B-General_Concept
11g	I-General_Concept
,	O
package	O
installation	O
date	O
,	O
symbolic	O
links	O
in	O
configuration	O
management	O
and	O
SELinux	O
support	O
for	O
configuration	O
management	O
.	O
</s>
<s>
June	O
16	O
,	O
2011	O
RHN	O
Satellite	O
5.4.1	O
released	O
Red	O
Hat	O
Enterprise	O
Linux	O
6	O
is	O
now	O
supported	O
as	O
a	O
base	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
