On 12/17/2013 07:13 PM, Marco wrote:
Hi!
I'm new to libvirt and face problems connecting to an iSCSI target. What I intend to do is to connect libvirt (I tried virt-manager and virsh) to an iSCSI target and then boot from the LUNs which contain the VMs.
I followed the documentation¹ but got stuck at section 12.1.5.4.3.
1) virsh pool-define-as \ --name foo \ --type iscsi \ --source-host vmhost \ --source-dev iqn.2013-11.vmhost:vmpool \ --target /dev/disk/by-path
2) virsh pool-start foo error: Failed to start pool foo error: internal error: cannot find session
virsh -c qemu:///system pool-start foo error: Failed to start pool foo error: internal error: cannot find session
I'm assuming 'vmhost' is actually some valid IP Address/Name that you're just using here to hide from the world your actual iSCSI tgt server. Don't forget that the 'source-host' may be listed as 'host1.example.com'; however, the iqn has 'com.example.host1'. IOW - reversed... Have you looked at http://libvirt.org/formatstorage.html ? There's an example there of output that works for me. Use virsh pool-dumpxml <pool> to view the XML... Also, do you need to authenticate to the iSCSI target? The iscsiadm will use '/etc/iscsi/iscsid.conf'. See the node.session.auth.{authmethod | username | password} fields, so while iscsiadm may work, when libvirt goes to connect it fails. Looking at the output in the system messages log may help (for my f19 /var/log/messages). You may also find if you have selinux enabled as Enforcing there could be more configuration that you need (if the iSCSI tgtd is local). Setting up a label on the file - something I'm not an expert at... Another tool to try is 'iscsi-ls' from package 'libiscsi-utils' iscsi-ls -s -i iqn.2013-11.vmhost:vmpool \ iscsi://<username>%<password>@<ipAddr>:3260 where the <username>/<password> allow the authentication to the ipAddr iSCSI tgt server. If you need to authenticate, then set up a secret to the iSCSI server, see http://libvirt.org/formatsecret.html for an example. HTH, John
Why can't libvirt find the session, and which session? Running
iscsiadm --mode discovery --type sendtargets --portal vmhost:3260,1
succeeds and lists the targets. How to connect libvirt to the iSCSI target?
System info:
Debian sid, Linux 3.11-2-amd64 libvirtd (libvirt) 1.1.4 virsh version: 1.1.4
What's your QEMU version?
iSCSI target: FreeNAS-9.1.1
Best regards Marco
¹ https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/...
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