I had a similar issue after upgrading from 15.04 to 15.10 yesterday
I was loosing DNS resolution ramdomly few minutes after VM start
Mar 18 10:27:17 guillaume-box NetworkManager[885]: <info> DNS: starting
dnsmasq...
Mar 18 10:27:17 guillaume-box NetworkManager[885]: <warn> dnsmasq not
available on the bus, can't update servers.
Mar 18 10:27:17 guillaume-box NetworkManager[885]: <error> [1458293237.010557]
[dns-manager/nm-dns-dnsmasq.c:387] update(): dnsmasq owner not found on bus:
Could not get owner of name 'org.freedesktop.NetworkManager.dnsmasq': no such
name
Mar 18 10:27:17 guillaume-box NetworkManager[885]: <warn> DNS: plugin dnsmasq
update failed
Mar 18 10:27:17 guillaume-box NetworkManager[885]: <info> Writing DNS
information to /sbin/resolvconf
[...]
Mar 18 10:27:17 guillaume-box dnsmasq[965]: DBus support enabled: connected to
system bus
Mar 18 10:27:17 guillaume-box dnsmasq[965]: warning: no upstream servers
configured
I was observing, dnsmaq process indeed running but not consistently
resolving name requests. I was observing empty dnsmasq conf files:
guillaume@guillaume-box:/etc/NetworkManager/dnsmasq.d$ ls -al
total 8
drwxr-xr-x 2 root root 4096 avril 17 2015 .
drwxr-xr-x 7 root root 4096 mars 17 23:11 ..
guillaume@guillaume-box:/etc/NetworkManager/dnsmasq.d$ ls -al
/var/run/NetworkManager/dnsmasq.conf
-rw-r--r-- 1 root root 0 mars 18 10:27 /var/run/NetworkManager/dnsmasq.conf
Whereas the network manager was properly displaying the DHCP provided
DNS servers in the its UI.
Trying to turn off and on network in the network manager did not solve
the issue.
I ended up turning off dnsmasq by eding /etc/NetworkManager/NetworkManager.conf
and comment out the following line from
dns=dnsmasq (as suggested into
http://www.ubuntugeek.com/how-to-disable-dnsmasq-in-ubuntu-12-04precise.html)
This seems to have worked around the issue. I understand the limitation
of the workaround (disabling dnsmasq) is that I don't have anymore a
local DNS cache, and only the 1st respondind DNS server is queried for
address resolution.
I ran into a reported bug (sorry I lost its reference) that claimed this
to be a distribution upgrade problem, and was suggesting to uninstall
dsnmaq and reinstall it. I haven't tried yet.
Hope this helps narrowing this nasty bug which was quite time consuming
to me.
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https://bugs.launchpad.net/bugs/1048430
Title:
"dnsmasq not available on the bus"
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