On 07/03/2018 01:08 AM, Michal Prívozník wrote:
> On 07/03/2018 01:40 AM, John Ferlan wrote:
>>
>>
>> On 06/29/2018 11:01 AM, Michal Privoznik wrote:
>>> After new iSCSI interface is successfully set up, we issue
>>
>> s/new/a new/
>> s/issue/issue a/
>>
>>> sendtargets command. However, after 56057900dc53df490d we don't
>>> update the host config which in turn makes login fail because
>>> iscsiadm is unable to find any matching record for the interface.
>>>
>>> Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
>>> ---
>>> src/storage/storage_backend_iscsi.c | 1 +
>>> src/util/viriscsi.c | 21 ++++++++++++++++++---
>>> src/util/viriscsi.h | 1 +
>>> tests/viriscsitest.c | 3 ++-
>>> 4 files changed, 22 insertions(+), 4 deletions(-)
>>>
>>
>> Like the previous patch - is there a specific bug or something that led
>> you down this path? Can you show an example of the existing code that's
>> creating a bad command line and generating an error and then how this
>> fixes things. It's not like we have tests and for this stuff it's
>> really nice to have plenty of examples.
>
> So here is the run without my patches:
>
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode session
> iscsiadm: No active sessions.
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode node --portal $PORTAL:3260,1 --targetname $TARGET --op new
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode node --portal $PORTAL:3260,1 --target $TARGET --op update --name node.session.auth.authmethod --value CHAP
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode node --portal $PORTAL:3260,1 --target $TARGET --op update --name node.session.auth.username --value $USER
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode node --portal $PORTAL:3260,1 --target $TARGET --op update --name node.session.auth.password --value $PASS
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode iface
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode iface --interface libvirt-iface-03316143 --op new
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode iface --interface libvirt-iface-03316143 --op update --name iface.initiatorname --value $INITIATOR
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode iface
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode discovery --type sendtargets --portal $PORTAL:3260,1 --op nonpersistent
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode node --portal $PORTAL:3260,1 --targetname $TARGET --login --interface libvirt-iface-03316143
> error : virCommandWait:2600 : internal error: Child process (iscsiadm --mode node --portal $PORTAL:3260,1 --targetname $TARGET --login --interface libvirt-iface-03316143) unexpected exit status 21:
> iscsiadm: No records found
> iscsiadm: No records found
>
>
> And with my patches:
>
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode session
> iscsiadm: No active sessions.
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode node --portal $PORTAL:3260,1 --targetname $TARGET --op new
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode node --portal $PORTAL:3260,1 --target $TARGET --op update --name node.session.auth.authmethod --value CHAP
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode node --portal $PORTAL:3260,1 --target $TARGET --op update --name node.session.auth.username --value $USER
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode node --portal $PORTAL:3260,1 --target $TARGET --op update --name node.session.auth.password --value $PASS
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode iface
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode iface --interface libvirt-iface-28727243 --op new
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode iface --interface libvirt-iface-28727243 --op update --name iface.initiatorname --value $INITIATOR
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode iface
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode discovery --type sendtargets --portal $PORTAL:3260,1 --interface libvirt-iface-28727243
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode node --portal $PORTAL:3260,1 --targetname $TARGET --login --interface libvirt-iface-28727243
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode session
> debug : virCommandRunAsync:2476 : About to run iscsiadm --mode session -r 1 -R
>
>
So the example helps me understand - thanks! The difference of discovery
being:
fail: iscsiadm --mode discovery --type sendtargets \
--portal $PORTAL:3260,1 \
--op nonpersistent
succ: iscsiadm --mode discovery --type sendtargets \
--portal $PORTAL:3260,1 \
--interface libvirt-iface-28727243
So, what commit 56057900d did to "help" or "fix" auto-login for sessions
that do not "belong to" libvirt is being called out as causing problems
for the initiatoriqn sessions. Prior to that commit the command was:
iscsiadm --mode discovery --type sendtargets --portal $PORTAL:3260,1
So, I have to wonder "how" or "if" discovery using an initiatoriqn
really worked since there wasn't an --interface argument. Not sure I
have the patience/desire to go through the history of refactors and
adjustments since 6aabcb5 though ;-). Although it does appear that the
original code would make a "node" during it's connection period rather
than doing a sendtargets using the --interface option (and whether that
option existed at the time is a different search through a different set
of code).
Given all of what's been discovered here - I think patch 4 and 5 should
be combined. And rather than adding a new "bool persist" parameter that
only is true when initiatoriqn is passed, let's use the fact that
initiatoriqn was passed in order to:
if (ifacename)
virCommandAddArgList(cmd, "--interface", ifacename, NULL);
else
virCommandAddArgList(cmd, "--op", "nonpersistent", NULL);
Then as long as non initiatoriqn sessions still work, even those without
a libvirt pool associated - we should be able to declare victory. Not
sure "if" non libvirt pool initiatoriqn sessions would be affected by
all this.
John
BTW: Based on that commit, I wonder if you can modify viriscsitest.c a
bit in order to generate the initiatoriqn output as well via a change to
testIscsiadmCb.
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