hostname and DNS
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From: Lao Ming on 11 Aug 2010 14:40 What makes /bin/hostname use an old DNS name instead of the name that / usr/bin/dig displays? I have a script which uses $( hostname -s ) to obtain the hostname. Even though the DNS update was done at least a month ago, /bin/hostname continues to provide the name that I don't want. I also have the hostname defined properly in /etc/hosts. Should I mention it to the DNS admin or is there some way to force getting the correct name?
From: pk on 11 Aug 2010 14:35 On Wed, 11 Aug 2010 11:40:58 -0700 (PDT) Lao Ming <laomingliu(a)gmail.com> wrote: > What makes /bin/hostname use an old DNS name instead of the name that / > usr/bin/dig displays? I have a script which uses $( hostname -s ) to > obtain the hostname. Even though the DNS update was done at least a > month ago, /bin/hostname continues to provide the name that I don't > want. I also have the hostname defined properly in /etc/hosts. > Should I mention it to the DNS admin or is there some way to force > getting the correct name? Check your /etc/hosts file.
From: Lao Ming on 11 Aug 2010 16:16 On Aug 11, 11:35 am, pk <p...(a)pk.invalid> wrote: > On Wed, 11 Aug 2010 11:40:58 -0700 (PDT) > > Lao Ming <laoming...(a)gmail.com> wrote: > > What makes /bin/hostname use an old DNS name instead of the name that / > > usr/bin/dig displays? I have a script which uses $( hostname -s ) to > > obtain the hostname. Even though the DNS update was done at least a > > month ago, /bin/hostname continues to provide the name that I don't > > want. I also have the hostname defined properly in /etc/hosts. > > Should I mention it to the DNS admin or is there some way to force > > getting the correct name? > > Check your /etc/hosts file. You probably just missed my mention of it above. The /etc/hosts file has the name as it should be. Thanks for your help.
From: pk on 11 Aug 2010 16:19 On Wed, 11 Aug 2010 13:16:08 -0700 (PDT) Lao Ming <laomingliu(a)gmail.com> wrote: > On Aug 11, 11:35 am, pk <p...(a)pk.invalid> wrote: > > On Wed, 11 Aug 2010 11:40:58 -0700 (PDT) > > > > Lao Ming <laoming...(a)gmail.com> wrote: > > > What makes /bin/hostname use an old DNS name instead of the name > > > that / usr/bin/dig displays? I have a script which uses $( hostname > > > -s ) to obtain the hostname. Even though the DNS update was done at > > > least a month ago, /bin/hostname continues to provide the name that I > > > don't want. I also have the hostname defined properly in /etc/hosts. > > > Should I mention it to the DNS admin or is there some way to force > > > getting the correct name? > > > > Check your /etc/hosts file. > > You probably just missed my mention of it above. The /etc/hosts file > has the name as it should be. Thanks for your help. Right, I missed it. Well, run "strace /bin/hostname" (or the equivalent of strace for your platform) and see what it does, ie what files it reads or what queries it performs. PS: it's a bit OT here.
From: Icarus Sparry on 11 Aug 2010 17:42
On Wed, 11 Aug 2010 11:40:58 -0700, Lao Ming wrote: > What makes /bin/hostname use an old DNS name instead of the name that / > usr/bin/dig displays? I have a script which uses $( hostname -s ) to > obtain the hostname. Even though the DNS update was done at least a > month ago, /bin/hostname continues to provide the name that I don't > want. I also have the hostname defined properly in /etc/hosts. Should I > mention it to the DNS admin or is there some way to force getting the > correct name? hostname will usually use whatever is configured in /etc/nsswitch.conf. This can include /etc/hosts and dns, but it can also use NIS, NIS+, or hesiod. It may also return whatever has been set by the "sethostname(2)" system call, which sometime is set from files like /etc/hostname or /etc/ nodename as part of the system bootup. |