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== Experimenting and Upgrading == If you intend to upgrade a system to get new features or security updates, you probably first test the new packages on the development machine, before you are ready to update the production server. Having some experience you do it properly: * Doing a backup of the server * Perform all the upgrades and install the new applications Two hours later you realise that something does not work as expected. To make it worse, it works fine on the development machine. We have all experienced this. Another solution to this problem would be to install the new production server on new hardware, but this is not as easy, as you have to clone the first server (most people are not comfortable doing this) or you do not have the hardware. Using virtual servers, all this is very easy: * Stop the virtual server in production * Make a copy of the virtual server * Perform the upgrades in the new virtual server To get back to our example above, two hours later you realise that something does not work as expected and you cannot immediately fix it. Again, using virtual servers, the (temporary) solution to this problem is very easy: * Stop the new virtual server and assign it a new IP address * Start both the old and new virtual server Now the old one is still online and you can track down the issues on your new virtual server using a different IP address, fix the problem and reassign the old IP address to the new virtual server. <br /> <div class="editsection" style="float:right;margin-left:5px;"> [<nowiki/>[[index.php?title=Usage_Scenarios&action=edit§ion=6|edit]]] </div> <span id="Distribution_Independence"></span> <span id="distribution-independence"></span>
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