Migrate DHCP agents from compute hosts to network controller nodes

Solution In Progress - Updated -

Environment

  • Red Hat OpenStack 6.0 (RHOS)

Issue

  • The DHCP and metadata agents were installed on the compute nodes instead of the network controllers

  • What is the procedure to migrate the agents to the network controller nodes?

Resolution

  1. Copy and paste the /etc/neutron/plugin.ini file from the compute host to the controller hosts
  2. Copy the /etc/neutron/metadata_agent.ini` file from the compute host to the controller hosts
  3. Copy the /etc/neutron/dhcp_agent.ini file from the compute host to the controller hosts
  4. Copy the /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini file from the compute host to the controller hosts

  5. In /etc/neutron/dhcp_agent.ini add :

    enable_isolated_metadata = True
enable_metadata_network = True

  6. In `/etc/neutron/metadata_agent.ini add:

    metadata_workers = 32

  7. Stop neutron-dhcp-agent on all computes

  8. Stop neutron-metadata-agent on all computes

  9. Delete all neutron-dhcp-agents for all networks

    neutron dhcp-agent-list-hosting-net 4dc325ed-f141-41d9-8d0a-4f513defacad
neutron dhcp-agent-network-remove 1beb99ef-e6f6-4083-8fb6-661f2f61c565 4dc325ed-f141-41d9-8d0a-4f513defacad

  10. Start neutron-dhcp-agent on the controller

  11. Start neutron-metadata-agent on the controller
  12. Restart openvswitch service everywhere
  13. Restart neutron-openvswitch-agent service everywhere
  14. Delete all qdhcp-* namespace on the compute nodes

Root Cause

  • Neutron DHCP agent and metadata agent were originally configured on the compute hosts

Diagnostic Steps

  1. Are neutron-dhcp-agent and neutron-metadata-agent running on the compute hosts ?

    neutron agent-list

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