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Once you have [[backups]], you can and should test the ability to restore those backups to a new hardware environment. The restore procedure is going to depend on what you used to create your "image" in the first place. Independent of the notion of backups, a system administrator (or even an experienced user) will want to "clone" a computer system. That is make an identical copy or nearly identical copy of a computer on different hardware. The most widespread use-case for this is when a person gets a new computer and wants to migrate the old computer software and data to the new hardware. From the system administrator's perspective, the common use case is different: it's when you have to build out a cluster, provide redundancy, or otherwise scale a hardware/software platform.
Consider all the times that you could produce a system that you wish to replicate. For example, a standard "Developer's Workstation" or "Designer's Studio" or "Student Desktop" and many more technical varieties like "Web Front-end", "Mail Relay" etc.
While cloning is never a real-time operation, synchronization can be. For system architectures that require high availability, or scalability, you will need some form of [[synchronization]] for various components of the system (disk, databases, etc.) == Apt-get dpkg --set-selections ==
One way to do this on Debian-based systems (including Ubuntu) is to use <code>dpkg</code> get/set-selections in combination with <code>apt-get</code> using it's dselect-upgrade option:
* [http://faiwiki.informatik.uni-koeln.de/index.php/Main_Page wiki].
* [http://www.slideshare.net/henningsprang/automated-installations-and-infrastructure-management-with-fai-presentation presentation]
* [[:MediaFile:Fai_poster_a4.pdf|600px|thumb|right|Fully Automated Install (FAI) Poster]]
== Replicator ==
</pre>
See what's available on our new host. (repositories are different)
<source lang="bash">
apt-cache search php5-
php5-xhprof - Hierarchical Profiler for PHP5
</pre>
And thus, our install
<source lang="bash">
sudo apt-get install php5-curl php5-gd php5-gmp php5-imap php5-intl php5-ldap php5-mcrypt php5-memcache php5-mysqlnd php5-pgsql php5-pspell php5-sqlite php5-tidy php5-xmlrpc php5-xsl
</source>
[[Category:Howto]]
