*** This bug is a duplicate of bug 809638 ***
https://bugs.launchpad.net/bugs/809638
Not using ubuntu, but this issue is happening to me and seemingly to a lot of
folks.
I think I've found the cause.
In my case, it was a matter of incorrectly configured DNS causing
creds.get_named_ccache()
to fail to find the KDC with which to obtain credentials. No core is being
dumped in my case;
I was just getting this famous stack dump when trying to do:
/usr/local/samba/sbin/samba_dnsupdate --verbose --all-names
as is suggested in the how-to I was reading to set up Samba.
A couple minutes with strace revealed that it was trying to look up
vmnet-dc1.vmnet.us
using my upstream ISP's name server. At first I just put 127.0.0.1 in the
/etc/krb.conf for
the kdc and admin_server settings in the [realms] section. This got me past
the stacktrace
but I was stilling getting a lot of '. .. blah blah blah not found' errors.
Then I realized that
I had left my ISP DNS in /etc/resolv.conf when I was wget-ing a needed source
tarball, and
forgot to set it back to 127.0.0.1 (to use the samba-populated DNS server
locally).
Herp derp derp! :) So I set resolv.conf to point at 127.0.0.1 and set
krb5.conf to use the
correct DNS names for kdc, etc. Bingo! It now works perfectly.
Bottom line with this "bug" I think is that you need to be VERY careful to set
up DNS
right or things will fail. (DNS tends to be that way)
/etc/resolv.conf:
------------ snip snip -------------------
search vmnet.us
nameserver 127.0.0.1
------------ snip snip -------------------
/etc/krb5.conf
------------ snip snip -------------------
[logging]
default = FILE:/var/log/krb5libs.log
kdc = FILE:/var/log/krb5kdc.log
admin_server = FILE:/var/log/kadmind.log
[libdefaults]
default_realm = VMNET.US
dns_lookup_realm = false
dns_lookup_kdc = true
ticket_lifetime = 24h
renew_lifetime = 7d
forwardable = true
[realms]
VMNET.US = {
kdc = vmnet-dc1.vmnet.us
admin_server = vmnet-dc1.vmnet.us
}
[domain_realm]
.vmnet.us = VMNET.US
vmnet.us = VMNET.US
------------ snip snip -------------------
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https://bugs.launchpad.net/bugs/1036820
Title:
samba_dnsupdate crashed with RuntimeError in get_credentials()
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