title: Devstack installation failed with error message "XXX: no process found"
body: <p>I'm trying to install Devstack on VMware cloud. After starting to run ./stack.sh, installation is failed with following error message.</p>
  
  <pre><code>+lib/cinder:create_volume_types:531        openstack --os-region-name=RegionOne volume type create --property volume_backend_name=lvmdriver-1 lvmdriver-1
  Internal Server Error (HTTP 500)
  +lib/cinder:create_volume_types:1          exit_trap
  +./stack.sh:exit_trap:489                  local r=1
  ++./stack.sh:exit_trap:490                  jobs -p
  +./stack.sh:exit_trap:490                  jobs=
  +./stack.sh:exit_trap:493                  [[ -n '' ]]
  +./stack.sh:exit_trap:499                  '[' -f /tmp/tmp.Y95KBJPvp8 ']'
  +./stack.sh:exit_trap:500                  rm /tmp/tmp.Y95KBJPvp8
  +./stack.sh:exit_trap:504                  kill_spinner
  +./stack.sh:kill_spinner:399               '[' '!' -z '' ']'
  +./stack.sh:exit_trap:506                  [[ 1 -ne 0 ]]
  +./stack.sh:exit_trap:507                  echo 'Error on exit'
  Error on exit
  +./stack.sh:exit_trap:509                  type -p generate-subunit
  +./stack.sh:exit_trap:510                  generate-subunit 1588897469 720 fail
  +./stack.sh:exit_trap:512                  [[ -z /opt/stack/logs ]]
  +./stack.sh:exit_trap:515                  /usr/bin/python3.6 /opt/devstack/tools/worlddump.py -d /opt/stack/logs
  World dumping... see /opt/stack/logs/worlddump-2020-05-08-003630.txt for details
  nova-compute: no process found
  neutron-dhcp-agent: no process found
  neutron-l3-agent: no process found
  neutron-metadata-agent: no process found
  neutron-openvswitch-agent: no process found
  +./stack.sh:exit_trap:524                  exit 1
  </code></pre>
  
  <p>It looks like HTTP 500 error is the primary issue. But ping to HOST_IP works very well so I can't figure out the cause.</p>
  
  <pre><code>[[local|localrc]]
  
  # Credentials
  ADMIN_PASSWORD=devstack
  MYSQL_PASSWORD=devstack
  RABBIT_PASSWORD=devstack
  SERVICE_PASSWORD=devstack
  SERVICE_TOKEN=token
  
  # Network Address
  HOST_IP=(...)
  </code></pre>
  
  <p>This is devstack's log file.</p>
  
  <pre><code>nova-compute Guru Meditation Report
  ===================================
  
  19171
  killall -e -USR2 nova-compute
  -----------------------------
  
  *** Failed to run 'killall -e -USR2 nova-compute': Command 'killall -e -USR2 nova-compute' returned non-zero exit status 1.
  guru meditation report in nova-compute log
  
  neutron-dhcp-agent Guru Meditation Report
  =========================================
  
  7758
  killall -e -USR2 neutron-dhcp-agent
  -----------------------------------
  
  *** Failed to run 'killall -e -USR2 neutron-dhcp-agent': Command 'killall -e -USR2 neutron-dhcp-agent' returned non-zero exit status 1.
  guru meditation report in neutron-dhcp-agent log
  
  neutron-l3-agent Guru Meditation Report
  =======================================
  
  8482
  killall -e -USR2 neutron-l3-agent
  ---------------------------------
  
  *** Failed to run 'killall -e -USR2 neutron-l3-agent': Command 'killall -e -USR2 neutron-l3-agent' returned non-zero exit status 1.
  guru meditation report in neutron-l3-agent log
  
  neutron-linuxbridge-agent Guru Meditation Report
  ================================================
  
  Skipping as neutron-linuxbridge-agent does not appear to be running
  
  neutron-metadata-agent Guru Meditation Report
  =============================================
  
  9103
  9719
  9720
  killall -e -USR2 neutron-metadata-agent
  ---------------------------------------
  
  *** Failed to run 'killall -e -USR2 neutron-metadata-agent': Command 'killall -e -USR2 neutron-metadata-agent' returned non-zero exit status 1.
  guru meditation report in neutron-metadata-agent log
  
  neutron-openvswitch-agent Guru Meditation Report
  ================================================
  
  7127
  killall -e -USR2 neutron-openvswitch-agent
  ------------------------------------------
  
  *** Failed to run 'killall -e -USR2 neutron-openvswitch-agent': Command 'killall -e -USR2 neutron-openvswitch-agent' returned non-zero exit status 1.
  guru meditation report in neutron-openvswitch-agent log
  
  cinder-volume Guru Meditation Report
  ====================================
  
  21971
  killall -e -USR2 cinder-volume
  ------------------------------
  
  guru meditation report in cinder-volume log
  </code></pre>
  
  <p>What is the problem?</p>