Re: [Xen-devel] [osstest test] 60719: tolerable FAIL - PUSHED

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Tue, 2015-09-01 at 13:47 +0100, Ian Jackson wrote:
> Jim Fehlig writes ("Re: [osstest test] 60719: tolerable FAIL - PUSHED"):
> > This sounds a bit like an issue discussed in the Redhat libvirt 
> > troubleshooting FAQ
> > 
> > https://access.redhat.com/documentation/en
> > -US/Red_Hat_Enterprise_Linux/7/html/Virtualization_Deployment_and_Admin
> > istration_Guide/sect-Troubleshooting
> > -Common_libvirt_errors_and_troubleshooting.html#sect
> > -Migration_fails_with_Error_unable_to_resolve_address
> 
> > Right. If it is a DNS issue, error handling in the libvirt libxl
> > migration code needs improving.
> 
> I booked out a test host, and (as I expected) forward DNS works, but
> reverse DNS on test box IP addresses does not:

As discussed IRL I was also investigating this using the Cambridge
instance, which does have correct reverse DNS:

    root@moss-bug    :~# host moss-bug.xs.citrite.net
    moss-bug.xs.citrite.net has address 10.80.229.144
    root@moss-bug    :~# host -i 10.80.229.144
    144.229.80.10.in-addr.arpa domain name pointer moss-bug.xs.citrite.net.
    root@moss-bug    :~# domainname -f
    moss-bug.xs.citrite.net
    root@moss-bug    :~# cat /etc/hosts
    127.0.0.1               localhost
    127.0.1.1               moss-bug.xs.citrite.net         moss-bug

    # The following lines are desirable for IPv6 capable hosts
    ::1     localhost ip6-localhost ip6-loopback
    ff02::1 ip6-allnodes
    ff02::2 ip6-allrouters
    root@moss-bug    :~#

(previously these machines had a wrong idea about their own FQDN, that is
now fixed)

I am now seeing the same error as the production instance:

2015-09-01 12:10:00 Z executing ssh ... root@xxxxxxxxxxxxx virsh --debug 0 
migrate --live debian.guest.osstest xen+ssh://10.80.228.77
migrate: live(bool): (none)
migrate: domain(optdata): debian.guest.osstest
migrate: desturi(optdata): xen+ssh://10.80.228.77
migrate: found option <domain>: debian.guest.osstest
migrate: <domain> trying as domain NAME
migrate: found option <domain>: debian.guest.osstest
migrate: <domain> trying as domain NAME
error: unable to connect to 'lace-bug.xs.citrite.net:49152': Invalid argument

> That admin guide article isn't quite clear, but reading between the
> lines and applying some supposition, maybe libvirt is doing a reverse
> lookup on some associated IP address ?

Based on the above that doesn't seem to be the case. So...

> I can probably put the test boxes in the reverse DNS,

... this is probably not needed.

>  but really I
> think at the very least libvirt's error message needs to be improved
> too.

Ian.

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