Long story below.
Short story: Rabbit MQ is not running



## The first command in UndercloudCtlplaneNetworkDeployment would be [1], GET networks?name=ctlplane can be seen in the neutron log.

https://logs.rdoproject.org/openstack-periodic/git.openstack.org/openstack-infra/tripleo-ci/master/periodic-tripleo-ci-centos-7-standalone-master/0323c3f/logs/undercloud/var/log/containers/neutron/server.log.txt.gz#_2018-11-16_12_01_34_564

2018-11-16 12:01:34.564 31 INFO neutron.wsgi [req-452824ab-2c8a-4a91-a627-0204a057c95b 4f57adfa456741acb057996b874bfd3b 1a495f2157094df0aed147f2115de58b - default default] 192.168.24.1 "GET /v2.0/networks?name=ctlplane HTTP/1.1" status: 200  len: 189 time: 1.0968869

Then not much happening in the neutron logs, and we the next thing in UndercloudCtlplaneNetworkDeployment POST command[2] gets the 504.

## The 504 ::

https://logs.rdoproject.org/openstack-periodic/git.openstack.org/openstack-infra/tripleo-ci/master/periodic-tripleo-ci-centos-7-standalone-master/0323c3f/logs/undercloud/var/log/journal.txt.gz#_Nov_16_12_03_34

Nov 16 12:03:34 upstream-centos-7-rdo-cloud-tripleo-0000299802.tripleodomain.exa haproxy[42025]: 192.168.24.2:49982 [16/Nov/2018:12:01:34.564] neutron~ neutron/upstream-centos-7-rdo-cloud-tripleo-0000299802.internalapi.localdomain 3/0/0/-1/120004 504 194 - - sH-- 53/0/0/0/0 0/0 "POST /v2.0/networks HTTP/1.1"

At the same time Neutrons seems to be up, and responding 

https://logs.rdoproject.org/openstack-periodic/git.openstack.org/openstack-infra/tripleo-ci/master/periodic-tripleo-ci-centos-7-standalone-master/0323c3f/logs/undercloud/var/log/containers/neutron/server.log.txt.gz#_2018-11-16_12_03_35_231



What I find strange is what is not happening in neutron logs right after it starts:
https://logs.rdoproject.org/openstack-periodic/git.openstack.org/openstack-infra/tripleo-ci/master/periodic-tripleo-ci-centos-7-standalone-master/0323c3f/logs/undercloud/var/log/containers/neutron/server.log.txt.gz

Ususally we get some RPC related stuff such as:

  neutron.services.l3_router.l3_router_plugin [-] neutron.services.l3_router.l3_router_plugin.L3RouterPlugin method start_rpc_listeners
  neutron.api.rpc.handlers.dhcp_rpc [req-49a9edd9-d581-4806-93e2-a6a872d50f4c - - - - -] get_active_networks_info from undercloud.localdomain


So, RPC ... Where is the rabbit mq logs?
https://logs.rdoproject.org/openstack-periodic/git.openstack.org/openstack-infra/tripleo-ci/master/periodic-tripleo-ci-centos-7-standalone-master/0323c3f/logs/undercloud/var/log/containers/


https://logs.rdoproject.org/openstack-periodic/git.openstack.org/openstack-infra/tripleo-ci/master/periodic-tripleo-ci-centos-7-standalone-master/0323c3f/logs/undercloud/var/log/extra/docker/containers/rabbitmq/stdout.log.txt.gz

[<0.32.0>,<0.31.0>]
[]
true
running
987
27
192
    initial_call:     pid:     registered_name:     error_info:     ancestors:     messages:     links:     dictionary:     trap_exit:     status:     heap_size:     stack_size:     reductions: 2018-11-16 11:57:21 std_info
kernel
{{shutdown,{failed_to_start_child,inet_db,{'EXIT',{function_clause,[{inet_config,set_hostname,[{error,enametoolong}],[{file,"inet_config.erl"},{line,228}]},{inet_config,init,0,[{file,"inet_config.erl"},{line,48}]},{inet_db,start_link,0,[{file,"inet_db.erl"},{line,113}]},{supervisor,do_start_child,2,[{file,"supervisor.erl"},{line,365}]},{supervisor,start_children,3,[{file,"supervisor.erl"},{line,348}]},{supervisor,init_children,2,[{file,"supervisor.erl"},{line,314}]},{gen_server,init_it,6,[{file,"gen_server.erl"},{line,328}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]}}}},{kernel,start,[normal,[]]}}
permanent
    application:     exited:     type: Kernel pid terminated (application_controller) ({application_start_failure,kernel,{{shutdown,{failed_to_start_child,inet_db,{'EXIT',{function_clause,[{inet_config,set_hostname,[{error,enametoolong}],[

{"Kernel pid terminated",application_controller,"{application_start_failure,kernel,{{shutdown,{failed_to_start_child,inet_db,{'EXIT',{function_clause,[{inet_config,set_hostname,[{error,enametoolong}],[{file,\"inet_config.erl\"},{line,228}]},{inet_config,init,0,[{file,\"inet_config.erl\"},{line,48}]},{inet_db,start_link,0,[{file,\"inet_db.erl\"},{line,113}]},{supervisor,do_start_child,2,[{file,\"supervisor.erl\"},{line,365}]},{supervisor,start_children,3,[{file,\"supervisor.erl\"},{line,348}]},{supervisor,init_children,2,[{file,\"supervisor.erl\"},{line,314}]},{gen_server,init_it,6,[{file,\"gen_server.erl\"},{line,328}]},{proc_lib,init_p_do_apply,3,[{file,\"proc_lib.erl\"},{line,247}]}]}}}},{kernel,start,[normal,[]]}}}"}
Crash dump is being written to: erl_crash.dump...




[1] https://github.com/openstack/tripleo-heat-templates/blob/master/extraconfig/post_deploy/undercloud_ctlplane_network.py#L47
[2] https://github.com/openstack/tripleo-heat-templates/blob/master/extraconfig/post_deploy/undercloud_ctlplane_network.py#L49-L53