19:02:51 <phillw> #startmeeting Introduction to zsync
19:02:51 <Meetingbot> Meeting started Sat Feb  9 19:02:51 2013 UTC.  The chair is phillw. Information about MeetBot at https://wiki.ubuntu.com/meetingology.
19:03:58 <phillw> Hi, this channel is quiet, if you have a question, please use #ubuntu-quality (prefix it with phillw so that I get notification)
19:04:13 <phillw> Why do we use zsync?
19:04:31 <phillw> There are several very good reasons..
19:05:09 <phillw> 1) it means that you can keep any iso fully upto date without re-downloading the entire iso each time
19:05:39 <phillw> 2) It reduces the load on the servers
19:06:05 <phillw> 3) you can use it to switch ISO's
19:06:42 <phillw> on the iso tracker
19:06:46 <phillw> #link http://iso.qa.ubuntu.com/qatracker/milestones/243/builds
19:07:24 <phillw> you can see all the available iso's, for this example I'm going to use the amd64 version of the server
19:07:44 <phillw> #link http://iso.qa.ubuntu.com/qatracker/milestones/243/builds/37236/downloads
19:08:02 <phillw> you will see there an entry for zsync
19:08:19 <phillw> zsync http://cdimage.ubuntu.com/ubuntu-server/daily/20130209/raring-server-amd64.iso.zsync
19:09:06 <phillw> to use this, change directory to where your older version of the iso is (e.g ~/Downloads)
19:09:35 <phillw> it's always good to do an ls *iso to ensure that you are in the right directory :)
19:10:28 <phillw> once that is confirmed, simply copy and paste the command into the terminal window.
19:11:03 <phillw> oops, I forgot the 'open a terminal window' :)
19:11:34 <phillw> the command will then check to see how much needs to be downloaded and then start the download.
19:12:32 <phillw> You can also use zsync to download an iso for the 1st time, in this case zsync will alert you to the fact that it cannot find any existing file and give you the chance to abort.
19:13:33 <phillw> one of the other nice tricks it can do is that if you have, say, lubuntu-amd64-desktop and you want to test xubuntu-amd64-desktop you need not download the entire xubuntu iso.
19:14:28 <phillw> bearing in mind that all the iso's are called generically (raring-desktop-amd64.iso)
19:15:14 <phillw> it's a very good idea to cp raring-desktop-amd64.iso to lubuntu-raring-desktop-amd64.iso so that you keep the original iso
19:16:18 <phillw> when you then use the zsync command for xubuntu it will look at the raring-desktop-amd64.iso file, remove what is not needed and add in what is needed for xubuntu.
19:17:02 <phillw> A full description of using zsync can be found at
19:17:33 <phillw> #link https://help.ubuntu.com/community/ZsyncCdImage
19:18:19 <phillw> If anyone has any questions, please feel free to ask on #ubuntu-quality
19:20:18 <phillw> For the upcoming sessions on virtualisation tools, please get the ISO that you have downloaded zsync'd up, otherwise you will find a delay as the 'old' ISO updates itself.
19:25:51 <pleia2> phillw: I'm linking logs from this and other sessions on the classroom blog post announcing smartboyhw's session, so even if participation isn't high live, they will be published on planet and in UWN so people can benefit from them :)
19:26:12 <phillw> #endmeeting