During the videomux debug, I noticed that the host name resolving on chiara didn't behave well. Basically I could not login to anything from chiara using host names.
I found that there was no /etc/resolv.conf. Instead, there is /etc/resolvconf directory.
According to my research, live resolv.conf is placed in /run/resolveconf/resolv.conf .
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 192.168.113.20
nameserver 131.215.125.1
nameserver 8.8.8.8
This 113.20 is directing an old "linux1" machine. Too much obsolete. If I modify this file as
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 192.168.113.104
nameserver 131.215.125.1
nameserver 8.8.8.8
search martian
Then the name resolving became reasonable. However, during rebooting / service resetting / etc, resolvconf -u command is executed and /run/resolveconf/resolv.conf is overridden, as indicated in the file.
I have modified /etc/resolvconf/resolv.conf.d/base to include 192.168.113.104 and search martian . The latter was included but the former did not show up.
FInally I figured out that, after the resolv.conf is constructed from base and head files in /etc/resolvconf/resolv.conf.d/ , NetworkManager overrides the nameserver addresses.
The configuration was found in /etc/NetworkManager/system-connections/Wired\ connection\ 1 .
Here is the modified setting (dns entry was modified)
>sudo cat /etc/NetworkManager/system-connections/Wired\ connection\ 1
[sudo] password for controls:
[802-3-ethernet]
duplex=full
mac-address=68:05:CA:36:4E:B4
[connection]
id=Wired connection 1
uuid=ed177e70-d10e-42be-8165-3bf59f8f199d
type=802-3-ethernet
timestamp=1438810765
[ipv6]
method=auto
[ipv4]
method=manual
dns=192.168.113.104;131.215.125.1;8.8.8.8;
addresses1=192.168.113.104;24;192.168.113.2;
And
>cat /etc/resolvconf/resolv.conf.d/base
search martian
# See Also /etc/NetworkManager/system-connections/Wired\ connection\ 1
So complicated...
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