Migrate OpenStack L3 and DHCP Agents on OpenStack Kolla-Ansible

migrate_openstack_l3_agents.sh

#!/bin/bash
# =============================================
# Created by: Richard Barrett
# Date Created: 11/09/2021
# Purpose: Migrate OpenStack L3 Agents
# Company: Charter Spectrum 
# =============================================

# Documentation:
# ========================================================================================
# https://docs.openstack.org/kolla-ansible/latest/user/adding-and-removing-hosts.html
# ========================================================================================

#set -e

# keep track of the last executed command
#trap 'last_command=$current_command; current_command=$BASH_COMMAND' DEBUG

# echo an error message before exiting
#trap 'echo "\"${last_command}\" command filed with exit code $?."' EXIT

# System Variables
# ================

# System Functions
# ================

# List Networking Agents Function
function list_networking_agents {
  while true; do
      read -p "Would you like to list all OpenStack Networking Agents (yes/no)?" yn
      case $yn in
          [Yy]* ) echo "======================================="; \
                  echo "      Listing Networking Agents..."; \
                  echo "======================================="; \
                  openstack network agent list --fit-width; \
                  echo "======================================="; \
                  break;;
          [Nn]* ) exit;;
          * ) echo "Please answer yes or no.";;
      esac
  done
}

# Migrate OpenStack L3 Agents Prompt
function migrate_openstack_l3_agents {
  while true; do
      echo "What is the source host L3 agent migration from?"
      read source_host
      echo "What is the target host L3 agent migration to?"
      read target_host
      read -p "Would you like to migrate all OpenStack L3 Agents (yes/no)?" yn
      case $yn in
          [Yy]* ) echo "======================================="; \
                  echo "      Migrating L3 Agents..."; \
                  echo "======================================="; \
                  l3_id=$(openstack network agent list --host $source_host --agent-type l3 -f value -c ID); \
                  target_l3_id=$(openstack network agent list --host target_host --agent-type l3 -f value -c ID); \
                  openstack router list --agent $l3_id -f value -c ID | while read router; do \
                    openstack network agent remove router $l3_id $router --l3; \
                    openstack network agent add router $target_l3_id $router --l3; \
                  done; \
                  openstack network agent set $l3_id --disable; \
                  echo "======================================="; \
                  break;;
          [Nn]* ) exit;;
          * ) echo "Please answer yes or no.";;
      esac
  done
}

# Migrate OpenStack DHCP Agents Prompt
function migrate_openstack_dhcp_agents {
  while true; do
      echo "What is the source host DHCP agent migration from?"
      read source_host
      echo "What is the target host DHCP agent migration to?"
      read target_host
      read -p "Would you like to migrate all OpenStack DHCP Agents (yes/no)?" yn
      case $yn in
          [Yy]* ) echo "======================================="; \
                  echo "      Migrating DHCP Agents..."; \
                  echo "======================================="; \
                  dhcp_id=$(openstack network agent list --host $source_host --agent-type dhcp -f value -c ID); \
                  target_dhcp_id=$(openstack network agent list --host $target_host --agent-type dhcp -f value -c ID); \
                  openstack network list --agent $dhcp_id -f value -c ID | while read network; do \
                    openstack network agent remove network $dhcp_id $network --dhcp \
                    openstack network agent add network $target_dhcp_id $network --dhcp \
                   done; \
                  echo "======================================="; \
                  break;; 
          [Nn]* ) exit;;
          * ) echo "Please answer yes or no.";;
      esac
  done
}

list_networking_agents
migrate_openstack_l3_agents
migrate_openstack_dhcp_agents