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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Wow, I can't believe I never thought of that. Just tested c3.large > c3.8xlarge transformation, and it worked just fine … AWS CLI for the command line win!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Courier New";color:#00B050">starcluster start -i c3.large -c mycluster mycluster<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Courier New";color:#00B050">starcluster stop -c mycluster<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Courier New";color:#00B050">starcluster lc ## wait till the nodes are all 'stopped'<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Courier New";color:#00B050">for ID in $(starcluster lc mycluster 2>/dev/null | grep -e node[0-9][0-9][0-9] -e master | awk '{print $3}'); do<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Courier New";color:#00B050"> echo $ID<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Courier New";color:#00B050"> # the magic:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Courier New";color:#00B050"> aws ec2 modify-instance-attribute --instance-id $ID --instance-type c3.8xlarge<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Courier New";color:#00B050">done<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Courier New";color:#00B050">starcluster start -x mycluster<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Seems like that could be pretty easily integrated into StarCluster.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">-Hugh<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Rayson Ho [mailto:raysonlogin@gmail.com]
<br>
<b>Sent:</b> Thursday, September 18, 2014 1:18 AM<br>
<b>To:</b> Ramon Ramirez-Linan<br>
<b>Cc:</b> MacMullan, Hugh; starcluster@mit.edu<br>
<b>Subject:</b> Re: [StarCluster] Changing iinstance type for everynode in the cluster<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I've never tried something like this myself, but I believe it would work if you stop the EBS cluster (*NOT* terminate), and then change the instance type from the EC2 management Console, and then restart the
cluster, then StarCluster would happily reconfig the cluster for you:<br>
<br>
<a href="http://star.mit.edu/cluster/docs/latest/manual/launch.html#stopping-an-ebs-backed-cluster">http://star.mit.edu/cluster/docs/latest/manual/launch.html#stopping-an-ebs-backed-cluster</a><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Just a reboot won't do it, as the private IP address changes when you change the instance type, and /etc/hosts would need to be changed again.<o:p></o:p></p>
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<p class="MsoNormal">(Test with a 2-node t1.micro cluster and change the type to t2.micro before doing anything experimental on a real production cluster.)<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal">Rayson<br>
<br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Sep 17, 2014 at 10:53 PM, Ramon Ramirez-Linan <<a href="mailto:rlinan@navteca.com" target="_blank">rlinan@navteca.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Is there a way of changing the instance type for the entire cluster after it has already be launched?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I want to launch a 30 nodes cluster with a cheaper instance type to ingest data on each node's volume. Each node has a 1TB EBS attached and there is no need to share data between nodes (no nfs or anything). Then once the data is injected
on each node I want to be able to change the cluster instances to a more expensive one (more CPU/RAM)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Will cluster reboot let me do that?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks in advance<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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