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  1. Couchbase Server
  2. MB-55153

[BP 7.1.4] Alerts reports "IP address seems to have changed" for nxdomain errors.

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    Description

      In a recent case this error was reported in the ns_server.debug.log

      [ns_server:error,2022-06-23T18:00:23.442Z,ns_1@cb-0000.cb.63344c9d-4a8d-464f-b38f-5c4edb2374fc.svc:<0.10890.2388>:menelaus_web_alerts_srv:can_listen:526]Cannot listen due to nxdomain from inet:getaddr[user:info,2022-06-23T18:00:23.442Z,ns_1@cb-0000.cb.63344c9d-4a8d-464f-b38f-5c4edb2374fc.svc:<0.10890.2388>:menelaus_web_alerts_srv:global_alert:120]IP address seems to have changed. Unable to listen on 'ns_1@cb-0000.cb.63344c9d-4a8d-464f-b38f-5c4edb2374fc.svc'. (POSIX error code: 'nxdomain') 

      This error is emitted by this code

      check(ip, Opaque, _History, _Stats) ->
          {_Name, Host} = misc:node_name_host(node()),
          case can_listen(Host) of
              {false, Error} ->
                  global_alert(ip, fmt_to_bin(errors(ip), [node(), Error]));
              true ->
                  ok
          end,
          Opaque;
       
      can_listen(Host) ->
          case inet:getaddr(Host, misc:get_net_family()) of
              {error, Err} ->
                  ?log_error("Cannot listen due to ~p from inet:getaddr~n", [Err]),
                  {false, Err};
      

      From the doc https://www.erlang.org/doc/man/inet.html#getaddr-2

      getaddr(Host, Family) -> {ok, Address} | {error, posix()}
          Types
                Host = ip_address() | hostname()
                Family = address_family()
                Address = ip_address()
       
      Returns the IP address for Host as a tuple of integers. Host can be an IP address, a single hostname, or a fully qualified hostname.
      

      It seems confusing to report the IP address has changed when a nxdomain error occurs.

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          For Gerrit Dashboard: MB-55153
          # Subject Branch Project Status CR V

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              ashwin.govindarajulu Ashwin Govindarajulu
              Abhijeeth.Nuthan Abhijeeth Nuthan
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                Created:
                Updated:
                Resolved:

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