Mailinglist Archive: opensuse (958 mails)

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Re: [opensuse] Where to set the domain name? - Leap 15.1 beta
On 05/07/2019 12:09 AM, Andrei Borzenkov wrote:
"Domain Name" field in YaST has very little to do with FQDN.

It adds the domain name to resolv.conf.  If the domain name is not in
that file, then yo u must use the FQDN to access anything on the LAN.

Here's some info from the resolv.conf man page:

"domain Local domain name.
              Most queries for names within this domain can use short names
              relative to the local domain.  If set to '.', the root domain
              is considered.  If no domain entry is present, the domain is
              determined from the local hostname returned by gethostname(2);
              the domain part is taken to be everything after the first '.'.
              Finally, if the hostname does not contain a domain part, the
              root domain is assumed.

       search Search list for host-name lookup.
              The search list is normally determined from the local domain
              name; by default, it contains only the local domain name.
              This may be changed by listing the desired domain search path
              following the search keyword with spaces or tabs separating
              the names.  Resolver queries having fewer than ndots dots
              (default is 1) in them will be attempted using each component
              of the search path in turn until a match is found.  For
              environments with multiple subdomains please read options
              ndots:n below to avoid man-in-the-middle attacks and
              unnecessary traffic for the root-dns-servers.  Note that this
              process may be slow and will generate a lot of network traffic
              if the servers for the listed domains are not local, and that
              queries will time out if no server is available for one of the
              domains."

Notice what it says about the domain name and search domains.  You need
the local domain to be listed in there somewhere.

Yesterday, I removed the domain name and could no longer ping with just
the host name.  I had to use the FQDN.


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