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<div style="font-size: 14px;"><span style="font-size: 11pt; font-family: Calibri;">> </span><span style="font-size: 11pt; font-family: Calibri;">Has anyone create an image that can be installed into other hypervisors than openstack? </span></div>
<div style="font-size: 14px;"><span style="font-size: 11pt; font-family: Calibri;">> I mean that I have the image, (let’s say a Cirros image), on an instance and I make some changes there. </span></div>
<div style="font-size: 14px;"><span style="font-size: 11pt; font-family: Calibri;">> How can I take that image together with my changes, produce a new image including the original one and the changes of course, </span></div>
<div style="font-size: 14px;"><span style="font-size: 11pt; font-family: Calibri;">> and load it into other hypervisors like VMware sphere, for instance?</span></div>
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<div style="font-size: 14px;">You can simply convert the image (make a snapshot) and convert it with e.g. Qemu-img to vmdk format:</div>
<div style="font-size: 14px;"><a href="http://docs.openstack.org/image-guide/content/ch_converting.html">http://docs.openstack.org/image-guide/content/ch_converting.html</a></div>
<div style="font-size: 14px;">However, if you want to create a standard image for multiple platforms I’d highly suggest to look at tools like packer:</div>
<div style="font-size: 14px;"> <a href="https://www.packer.io/docs/builders/openstack.html">https://www.packer.io/docs/builders/openstack.html</a> which can output to different formats.</div>
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<div>> <font size="3">If I want to take an image from an instance from openstack cloud A and load it into a VM into another openstack cloud B, will it work?</font><span style="font-family: Calibri, sans-serif;"> </span>And how?
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<div>> <span style="font-family: Calibri;">Just by loading it to the new VM or do I have to process/change it somehow?</span></div>
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<div>Yes you can. Make a snapshot and import it. </div>
<div>(assuming you are allowed to snapshot and upload your own images.)</div>
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<div><span style="font-family: Calibri;">> I’m afraid this would mix up the IPs of the two clouds, (internal and external IPs), </span></div>
<div><span style="font-family: Calibri;">> and in general the network configuration would be different on the two openstack cloud environments, so how this can be done?</span></div>
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<div>Usually IP’s are coming from DHCP in some way so it should just pick a IP from the DHCP pool.</div>
<div>If you have exactly the same IP space you could (in theory) boot them with the same IP:</div>
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<div>Using the nova boot with "v4-fixed-<wbr>ip” argument to boot it with a specific IP.</div>
<div>In general I would highly recommend to make it work with whatever DHCP gives you and fix resolving of services with the appropriate tools (DNS / Zookeeper /etcd... )</div>
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<div><span style="font-size: 15px;">> </span>I tried to implement this by taking snapshots on my VMs I want the image to be transferred.
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<div>> <span style="font-family: Calibri;">The result was to take a backup of my volume, the one that it is used by the VM. </span></div>
<div><span style="font-family: Calibri;">> The problem here is that if my VM uses, for instance, the xlarge flavor, it means it will take a snapshot of 160GB for an OS only of 12.5 MB, which is really TRAGIC!!!!</span></div>
<div><span style="font-family: Calibri;">> So, under what situations it is preferable to use snapshots? </span></div>
<div><span style="font-family: Calibri;">> This is an extreme example to understand my thought/question and the reason why I cannot use snapshot.</span></div>
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<div>It al depends on what you actually want to achieve what makes the most sense.</div>
<div>A onetime migration from cloud A to B? DR scenario? Running by default with 2 cloud providers?</div>
<div>e.g. it might make more sense to just spawn an instance in the second cloud and e.g. Rsync the data from within the 2 instances.</div>
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<div><span style="font-size: 15px;">> </span>By taking a snapshot from a VM as I said it will take a snapshot of the volume used on the specific flavor for a VM. This will take the NFS file as well, right?
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<div>><span style="font-family: Calibri;">There is no any special volume other than the one used on the flavor storing the > NFS details, correct? Of course, by default openstack installation/configuration</span></div>
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<div>Not sure what you mean by NFS. You can implement nfs in many ways.</div>
<div>Iirc if it is a “separate” cinder volume you need to snapshot that separately. </div>
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<div style="font-size: 11pt;"><span style="font-size: 11pt;">Cheers,</span></div>
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<div>Robert van Leeuwen</div>
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