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Anyone here who can help me out with OpenNebula?
SolidxGaming
Member
in Help
Can someone help me with setting up OpenNebula? I'm confused about the storage and the networking part. I want to do a simple local storage (without HA ofc) but the docs seem confusing.
Comments
OpenNebula's default data-store setup would work, if the Sunstone Interface is deployed in a different server than the hosts and you don't want to have the images transferred via network - then you would need to create an Image Datastore and in the bridge_list options add the hostname/s of the servers that you want to store the OS Images in.
This would give you direct local storage to store your images in your host/s.
You would also want to create a new system datastore for your host, which will be used to store running and stopped VMs.
Your second option is using NFS & Shared Drivers, see this: https://forum.opennebula.org/t/local-storage-per-host/3504
For networking, just use standard Linux Bridges or OpenvSwitch Bridges.
Thanks for the reply @DETio. I was wondering about the System Datastore. Can I have it in LVM/Filesystem? Can't find any docs about the system DS.
Also, if I want images to be stored on the host for example, do I just make two partitions (one for images + the other for the VM's disks) and then mount them onto /var/lib/one/datastores/?
You can separate the partitions, and then mount each partition to the respective /var/lib/one/datastore_id
This doc shows how to setup LVM: https://docs.opennebula.org/5.6/deployment/open_cloud_storage_setup/lvm_drivers.html
System/Image datastores can be either LVM or Filesystem.
@DETio Does FS have any disadvantages compared to LVM? Like in terms of performance?
LVM has slightly better performance than FS, but FS is easier to setup.
@DETio, not sure what this means: All the nodes needs to have access to the same LUNs.
LUNs are for Shared Storage, that's if your setting up multiple hosts on the same LVM VG Datastore - if you're using a SAN.
LVMs can be used for local storage right?
Yes, you would just have to create 2 Data-stores (Image & System) for each host.
The best way is to just use LVM for System, and FS for Images.
Welp interesting. I went with FS for both images and system. Seems like images is being detected properly, but the system ds reports the size of /, not /var/lib/one/datastores/101.
/dev/md3 118G 61M 112G 1% /var/lib/one/datastores/100 /dev/md4 1.7T 77M 1.6T 1% /var/lib/one/datastores/101Not sure what's up.
LOCAL SYSTEM DATASTORE #101 CAPACITY TOTAL: : 1.6T USED: : 77M FREE: : 1.5Tonehost show shows this. No clue what's wrong.
Try deploying vms on that system datastore and see which partition it's using. I can see it has 1.5T capacity- how much is it reporting?
It's reporting nothing. I tried to deploy a VM:
Thu Aug 16 08:11:59 2018 : Error executing image transfer script: Error copying sunstone:/var/lib/one//datastores/100/148b9cbd5e96a9c35690066468e4c54a to compute_node:/var/lib/one//datastores/102/1/disk.0
Not sure why it's trying to copy the template that exists in the ds on the compute node from the sunstone node.
I'll pm you to help.