@@ -231,13 +231,19 @@ <h2>Ubuntu</h2>
231231manager</ a > . For desktop versions of Ubuntu,
232232GNOME (until the 11.04 release) or Unity (11.10 through current)
233233is added to the distribution to provide a user interface.</ p >
234+ < p > Ubuntu < a class ="reference external " href ="https://wiki.ubuntu.com/LTS "> Long Term Support (LTS)</ a > releases
235+ are the recommended versions to use for deployments. LTS versions receive
236+ five years of post-release updates from Canonical. Every two years, Canonical
237+ creates a new LTS release, which allows for an easy upgrade path as well
238+ as flexibility in skipping every other LTS release if necessary.</ p >
234239</ div >
235240< div class ="section " id ="red-hat-and-centos ">
236241< h2 > Red Hat and CentOS</ h2 >
237242< p > < a class ="reference external " href ="http://www.redhat.com/products/enterprise-linux/ "> Red Hat Enterprise Linux</ a >
238- (RHEL) and Community enterprise Operating
239- System (CentOS) are essentially the same distribution. The key
240- difference is that CentOS is an open source free derivative of RHEL.</ p >
243+ (RHEL) and < a class ="reference external " href ="http://www.centos.org/ "> Community ENTerprise Operating System</ a >
244+ (CentOS) are the same distribution. The only difference between the two
245+ (other than the name) is that CentOS is an open source, liberally
246+ licensed free derivative of RHEL.</ p >
241247< p > RHEL and CentOS use a different package manager and command-line interface
242248from Debian-based Linux distributions: RPM Package Manager (RPM) and the
243249Yellowdog Updater, Modified (YUM). RPM has a specific .rpm file format
@@ -430,6 +436,7 @@ <h1>Caching</h1>
430436operations and serving the precomputed answers to clients.</ p >
431437< div class ="section " id ="caching-resources ">
432438< h2 > Caching Resources</ h2 >
439+ < p > < a class ="reference external " href ="http://memcached.org/ "> memcached</ a > is a common in-memory caching system.</ p >
433440</ div >
434441
435442 </ section >
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