[erlang-questions] erl: "Can't set long node name!"

Edwin Fine <>
Thu Jun 19 05:00:03 CEST 2008


Is your OS set up to have a long hostname? What does hostname --long show? I
think Erlang expects to see something like mybox.domain.name. Very often,
home or personal Linux installations are created without a domain name, so
hostname --long returns something just like "mybox". You need to change this
so that you have a domain name. To do this, I think you would need to set
your box to have a static IP address (not DHCP) and modify /etc/hosts so
that the static IP address for your box is known by a fully qualified name,
e.g.

/etc/hosts:
127.0.0.1 localhost
192.168.1.100 mybox.mydomain.com

If you're not actually on a real domain (which is probable), you'll need to
make one up.

Hope this helps. It worked for me.

On Wed, Jun 18, 2008 at 9:48 PM, John Chandler <> wrote:

> I was following an example and found that my configuration lacks the
> ability to "set long node name."  I checked the crash dump, and it
> wasn't informative to me.  I would attach it, but it's 180K, so I'll
> only do that if asked to.
>
> So, any idea what I should change in my configuration?
>
> -jmc
> ====
>  $ erl -name foo
> {error_logger,{{2008,6,18},{21,43,13}},"Can't set long node name!
> \nPlease check your configuration\n",[]}
> {error_logger,{{2008,6,18},{21,43,13}},crash_report,[[{pid,<0.20.0>},
> {registered_name,net_kernel},{error_info,{error,badarg}},
> {initial_call,{gen,init_it,[gen_server,<0.17.0>,<0.17.0>,
> {local,net_kernel},net_kernel,{foo,longnames,15000},[]]}},{ancestors,
> [net_sup,kernel_sup,<0.8.0>]},{messages,[]},{links,[<0.17.0>]},
> {dictionary,[{longnames,true}]},{trap_exit,true},{status,running},
> {heap_size,233},{stack_size,21},{reductions,363}],[]]}
> {error_logger,{{2008,6,18},{21,43,13}},supervisor_report,[{supervisor,
> {local,net_sup}},{errorContext,start_error},{reason,
> {'EXIT',nodistribution}},{offender,[{pid,undefined},{name,net_kernel},
> {mfa,{net_kernel,start_link,[[foo,longnames]]}},
> {restart_type,permanent},{shutdown,2000},{child_type,worker}]}]}
> {error_logger,{{2008,6,18},{21,43,13}},supervisor_report,[{supervisor,
> {local,kernel_sup}},{errorContext,start_error},{reason,shutdown},
> {offender,[{pid,undefined},{name,net_sup},{mfa,
> {erl_distribution,start_link,[]}},{restart_type,permanent},
> {shutdown,infinity},{child_type,supervisor}]}]}
> {error_logger,{{2008,6,18},{21,43,13}},crash_report,[[{pid,<0.7.0>},
> {registered_name,[]},{error_info,{shutdown,{kernel,start,[normal,
> []]}}},{initial_call,{application_master,init,[<0.5.0>,<0.6.0>,
> {appl_data,kernel,
> [application_controller,erl_reply,auth,boot_server,code_server,disk_log_
> server,disk_log_sup,erl_prim_loader,error_logger,file_server_2,fixtable_
> server,global_group,global_name_server,heart,init,kernel_config,kernel_s
> up,net_kernel,net_sup,rex,user,os_server,ddll_server,erl_epmd,inet_db,pg
> 2],undefined,{kernel,[]},
> [application,application_controller,application_master,application_start
> er,auth,code,code_aux,packages,code_server,dist_util,erl_boot_server,erl
> _distribution,erl_prim_loader,erl_reply,erlang,error_handler,error_logge
> r,file,file_server,file_io_server,prim_file,global,global_group,global_s
> earch,group,heart,hipe_unified_loader,inet6_tcp,inet6_tcp_dist,inet6_udp
> ,inet_config,inet_hosts,inet_gethost_native,inet_tcp_dist,init,kernel,ke
> rnel_config,net,net_adm,net_kernel,os,ram_file,rpc,user,user_drv,user_su
> p,disk_log,disk_log_1,disk_log_server,disk_log_sup,dist_ac,erl_ddll,erl_
> epmd,erts_debug,gen_tcp,gen_udp,gen_sctp,prim_inet,inet,inet_db,inet_dns
> ,inet_parse,inet_res,inet_tcp,inet_udp,inet_sctp,pg2,seq_trace,wrap_log_
> reader,zlib,otp_ring0],[],infinity,infinity},normal]}},{ancestors,
> [<0.6.0>]},{messages,[{'EXIT',<0.8.0>,normal}]},{links,
> [<0.6.0>,<0.5.0>]},{dictionary,[]},{trap_exit,true},{status,running},
> {heap_size,987},{stack_size,21},{reductions,2063}],[]]}
> {error_logger,{{2008,6,18},{21,43,13}},std_info,[{application,kernel},
> {exited,{shutdown,{kernel,start,[normal,[]]}}},{type,permanent}]}
> {"Kernel pid
> terminated",application_controller,"{application_start_failure,kernel,
> {shutdown,{kernel,start,[normal,[]]}}}"}
>
> Crash dump was written to: erl_crash.dump
> Kernel pid terminated (application_controller)
> ({application_start_failure,kernel,{shutdown,{kernel,start,[normal,
> []]}}})
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