Minimal OpenStack-Ansible config using low spec gear.

openstack_user_config.yml

---
cidr_networks:
  container: "172.16.26.0/24"
  tunnel: "172.29.240.0/22"
  storage: "172.29.244.0/24"


used_ips:
  - "172.16.26.1,172.16.26.50"
  - "172.16.26.100,172.16.26.200"
  - "172.29.240.1,172.29.240.50"
  - "172.29.240.100,172.29.240.200"
  - "172.29.244.1,172.29.244.50"
  - "172.29.244.100,172.29.244.200"

global_overrides:
  internal_lb_vip_address: "172.16.26.1"
  external_lb_vip_address: "10.127.83.101"
  tunnel_bridge: "br-mgmt"
  management_bridge: "br-mgmt"
  provider_networks:
    - network:
        container_bridge: "br-mgmt"
        container_type: "veth"
        container_interface: "eth1"
        host_bind_override: "eth12"
        container_netmask: "255.255.252.0"
        ip_from_q: "container"
        type: "flat"
        net_name: "flat"
        group_binds:
          - all_containers
          - hosts
        is_container_address: true
        is_ssh_address: true
    - network:
        container_bridge: "br-mgmt"
        container_type: "veth"
        container_interface: "eth10"
        ip_from_q: "tunnel"
        type: "vxlan"
        range: "1:1000"
        net_name: "vxlan"
        group_binds:
          - neutron_linuxbridge_agent
        is_container_address: true
        is_ssh_address: true
    - network:
        container_bridge: "br-storage"
        container_type: "veth"
        container_interface: "eth2"
        ip_from_q: "storage"
        type: "raw"
        group_binds:
          - glance_api
          - cinder_api
          - cinder_volume
          - nova_compute
          - ceph-osd
  swift:
    part_power: 8
    drives:
      - name: disk1
      - name: disk2
      - name: disk3
    mount_point: /srv
    storage_policies:
      - policy:
          name: default
          index: 0
          default: True


###
### Anchors
###
cinder_block: &cinder_block
  n5:
    ip: 10.127.83.104
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.104/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.104/24
        - 172.29.240.104/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.104/24
    container_vars:
      cinder_backends:
        limit_container_types: cinder_volume
        lvm:
          volume_group: cinder-volumes
          volume_driver: cinder.volume.drivers.lvm.LVMVolumeDriver
          volume_backend_name: LVM_iSCSI
          iscsi_ip_address: 172.16.26.104
        RBD:
          volume_driver: cinder.volume.drivers.rbd.RBDDriver
          rbd_pool: volumes
          rbd_ceph_conf: /etc/ceph/ceph.conf
          rbd_store_chunk_size: 8
          volume_backend_name: rbddriver
          rbd_user: "{{ cinder_ceph_client }}"
          rbd_secret_uuid: "{{ cinder_ceph_client_uuid }}"
          report_discard_supported: true


ceph_block: &ceph_block
  n8:
    ip: 10.127.83.107
    host_vars:
      devices:
        - /dev/sdc
        - /dev/sdd
        - /dev/sde
        - /dev/sdf
        - /dev/sdg
        - /dev/sdh
        - /dev/sdi
        - /dev/sdj
        - /dev/sdk
        - /dev/sdl
        - /dev/sdm
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.107/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.107/24
        - 172.29.240.107/24
      host_storage_brige_interface: eth2
      host_storage_brige_addresses:
        - 172.29.244.107/24
  n9:
    ip: 10.127.83.108
    host_vars:
      devices:
        - /dev/sdc
        - /dev/sdd
        - /dev/sde
        - /dev/sdf
        - /dev/sdg
        - /dev/sdi
        - /dev/sdj
        - /dev/sdk
        - /dev/sdl
        - /dev/sdm
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.108/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.108/24
        - 172.29.240.108/24
      host_storage_brige_interface: eth2
      host_storage_brige_addresses:
        - 172.29.244.108/24
  n10:
    ip: 10.127.83.109
    host_vars:
      devices:
        - /dev/sdc
        - /dev/sdd
        - /dev/sde
        - /dev/sdf
        - /dev/sdg
        - /dev/sdh        
        - /dev/sdi
        - /dev/sdj
        - /dev/sdk
        - /dev/sdl
        - /dev/sdm
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.109/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.109/24
        - 172.29.240.109/24
      host_storage_brige_interface: eth2
      host_storage_brige_addresses:
        - 172.29.244.109/24

network_block: &network_block
  n11:
    ip: 10.127.83.110
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.110/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.110/24
        - 172.29.240.110/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.110/24
  n12:
    ip: 10.127.83.111
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.111/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.111/24
        - 172.29.240.111/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.111/24
  n14:
    ip: 10.127.83.113
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.113/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.113/24
        - 172.29.240.113/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.113/24

compute_block: &compute_block
  n1:
    ip: 10.127.83.100
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.100/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.100/24
        - 172.29.240.100/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.100/24
  n4:
    ip: 10.127.83.103
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.103/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.103/24
        - 172.29.240.103/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.103/24
  n6:
    ip: 10.127.83.105
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.105/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.105/24
        - 172.29.240.105/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.105/24
  n18:
    ip: 10.127.83.117
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.117/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.117/24
        - 172.29.240.117/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.117/24
  n19:
    ip: 10.127.83.118
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.118/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.118/24
        - 172.29.240.118/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.118/24
  n20:
    ip: 10.127.83.119
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.119/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.119/24
        - 172.29.240.119/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.119/24
  n21:
    ip: 10.127.83.120
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.120/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.120/24
        - 172.29.240.120/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.120/24

infra_block: &infra_block
  n17:
    ip: 10.127.83.123
    host_vars:
      host_vg: lab0-vg
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.123/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.123/24
        - 172.29.240.123/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.123/24
  n16:
    ip: 10.127.83.115
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.115/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.115/24
        - 172.29.240.115/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.115/24
  n13:
    ip: 10.127.83.112
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.112/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.112/24
        - 172.29.240.112/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.112/24

loadbalancer_block: &loadbalancer_block
  n2:
    ip: 10.127.83.101
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.101/24
        - 10.127.83.201/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.1/24
        - 172.16.26.101/24
        - 172.29.240.101/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.101/24

log_block: &log_block
  n15:
    ip: 10.127.83.114
    host_vars:
      host_vg: vg00
      host_int_gateway: 10.127.83.1
      host_int_interface: eth0
      host_int_addresses:
        - 10.127.83.114/24
      host_mgmt_brige_interface: eth1
      host_mgmt_brige_addresses:
        - 172.16.26.114/24
        - 172.29.240.114/24
      host_storage_brige_interface: eth4
      host_storage_brige_addresses:
        - 172.29.244.114/24

swift_block: &swift_block
  n17:
    ip: 10.127.83.123


###
### Ceph
###

# The infra nodes where the Ceph mon services will run
ceph-osd_hosts: *ceph_block

# The nodes that the Ceph RadosGW object gateways will be running on
ceph-rgw_hosts: *cinder_block

###
### Infrastructure
###

# galera, memcache, rabbitmq, utility
shared-infra_hosts: *infra_block

# repository (apt cache, python packages, etc)
repo-infra_hosts: *infra_block

# rsyslog server
log_hosts: *log_block

# load balancer
haproxy_hosts: *loadbalancer_block

# Legacy infra hosts
os-infra_hosts: *infra_block

# ceph-mon containers
ceph-mon_hosts: *cinder_block

###
### OpenStack
###

# keystone
identity_hosts: *infra_block

# cinder api services
storage-infra_hosts: *cinder_block

# cinder storage host (LVM-backed)
storage_hosts: *cinder_block

# glance
image_hosts: *cinder_block

# nova api, conductor, etc services
compute-infra_hosts: *infra_block

# nova hypervisors
compute_hosts: *compute_block

# heat
orchestration_hosts: *infra_block

# horizon
dashboard_hosts: *infra_block

# neutron server, agents (L3, etc)
network_hosts: *network_block

# ceilometer (telemetry data collection)
# metering-infra_hosts: *infra_block

# aodh (telemetry alarm service)
# metering-alarm_hosts: *infra_block

# gnocchi (telemetry metrics storage)
# metrics_hosts: *infra_block

# ceilometer compute agent (telemetry data collection)
# metering-compute_hosts: *compute_block

# swift storage hosts
#swift_hosts: *swift_block

# swift infra hosts
#swift-proxy_hosts: *infra_block

key-manager_hosts: *infra_block

playbook-lv-mount.yml

---

- name: Create, format and mount machines lv
  hosts: shared-infra_hosts
  user: root
  gather_facts: true
  pre_tasks:
    - name: Remove deleteme mount (/var/lib)
      mount:
        path: "/var/lib/{{ item }}"
        state: absent
      with_items:
        - deleteme
        - deleteme00
    - name: Remove deleteme mount (/)
      mount:
        path: "/{{ item }}"
        state: absent
      with_items:
        - deleteme
        - deleteme00
    - name: Remove deleteme lv
      lvol:
        vg: "{{ host_vg }}"
        lv: "{{ item }}"
        state: absent
        force: true
      with_items:
        - deleteme
        - deleteme00
    - name: Create machines lv
      lvol:
        vg: "{{ host_vg }}"
        lv: machines00
        size: 25G
    - name: Format the machines lv
      filesystem:
        fstype: btrfs
        dev: "/dev/{{ host_vg }}/machines00"
  roles:
    - role: systemd_mount
      systemd_mounts:
        - what: "/dev/{{ host_vg }}/machines00"
          where: "/var/lib/machines"
          options: "defaults,noatime,nodiratime,compress=lzo,commit=120,{{ (ansible_kernel is version_compare('4.5', '>=')) | ternary('space_cache=v2', 'space_cache') }}"
          type: "btrfs"
          state: 'started'

- name: Create format and mount swift disks
  hosts: swift_hosts
  user: root
  pre_tasks:
    - name: Create machines lv
      lvol:
        vg: "{{ host_vg }}"
        lv: "{{ item }}"
        size: 20G
      with_items:
        - disk1
        - disk2
        - disk3
    - name: Format the Swift files
      filesystem:
        fstype: xfs
        opts: '-K'
        dev: "/dev/lab0-vg/{{ item }}"
      with_items:
        - disk1
        - disk2
        - disk3
  roles:
    - role: systemd_mount
      systemd_mounts:
        - what: "/dev/lab0-vg/disk1"
          where: "/srv/disk1"
          options: "noatime,nodiratime,nobarrier,logbufs=8"
          type: "xfs"
          state: 'started'
          enabled: true
        - what: "/dev/lab0-vg/disk2"
          where: "/srv/disk2"
          options: "noatime,nodiratime,nobarrier,logbufs=8"
          type: "xfs"
          state: 'started'
          enabled: true
        - what: "/dev/lab0-vg/disk3"
          where: "/srv/disk3"
          options: "noatime,nodiratime,nobarrier,logbufs=8"
          type: "xfs"
          state: 'started'
          enabled: true

- name: Create, format and mount nova lv
  hosts: compute_hosts
  user: root
  pre_tasks:
    - name: Create nova lv
      lvol:
        vg: "{{ host_vg }}"
        lv: nova00
        size: 100%FREE
    - name: Format the machines lv
      filesystem:
        fstype: xfs
        dev: "/dev/{{ host_vg }}/nova00"
  roles:
    - role: systemd_mount
      systemd_mounts:
        - what: "/dev/{{ host_vg }}/nova00"
          where: "/var/lib/nova"
          options: "defaults,noatime,nodiratime"
          type: "xfs"
          state: 'started'
          enabled: true

playbook-networkd-host-interfaces.yml

---

# Setup networkd across the cloud

- name: Setup and configure networkd
  hosts: hosts
  roles:
    - role: "systemd_networkd"
      systemd_run_networkd: no
      systemd_networks:
        - interface: "{{ host_int_interface }}"
          address: "{{ host_int_addresses }}"
          gateway: "{{ host_int_gateway }}"
          usedns: true
  
    - role: "systemd_networkd"
      systemd_run_networkd: no
      systemd_netdevs:
        - NetDev:
            Name: br-mgmt
            Kind: bridge
        - NetDev:
            Name: br-mgmt-veth
            Kind: veth
          Peer:
            Name: eth12
      systemd_networks:
        - interface: "br-mgmt"
          address: "{{ host_mgmt_brige_addresses }}"
          usedns: true
          config_overrides:
            Network:
              ConfigureWithoutCarrier: true
        - interface: "{{ host_mgmt_brige_interface }}"
          bridge: "br-mgmt"

    - role: "systemd_networkd"
      systemd_run_networkd: no
      systemd_netdevs:
        - NetDev:
            Name: br-storage
            Kind: bridge
      systemd_networks:
        - interface: "br-storage"
          address: "{{ host_storage_brige_addresses }}"
          usedns: true
          config_overrides:
            Network:
              ConfigureWithoutCarrier: true
        - interface: "{{ host_storage_brige_interface }}"
          bridge: "br-storage"
      when:
        - host_storage_brige_interface is defined

    - role: systemd_service
      systemd_services:
        - service_name: "networking-post-up"
          config_overrides:
            Unit:
              Description: networking-post-up
              After: network-online.target
              Wants: network-online.target
            Service:
              RemainAfterExit: yes
          service_type: oneshot
          execstarts:
            - "-/bin/ip link set eth12 up"
            - "-/bin/ip link set br-mgmt-veth up"
            - "-/bin/ip link set dev br-mgmt-veth master br-mgmt"
            - "-/sbin/ethtool -K br-mgmt gso off sg off tso off tx off"
            - "-/sbin/ethtool -K eth12 gso off sg off tso off tx off"
            - "-/sbin/ethtool -K br-mgmt-veth gso off sg off tso off tx off"

  post_tasks:
    - name: Interface take down and networkd restart
      shell: | 
        ip link set br-storage down
        ip link del br-storage
        ip link set br-mgmt down
        ip link del br-mgmt
        systemctl restart systemd-networkd
        ip link set br-mgmt up
        ip link set br-storage up
        systemctl restart networking-post-up

provisioning-inventory.yml

---
################################### Anchors ###################################
# Used more than once in inventory, an anchor keeps things dry.

################################## ALL HOSTS ##################################
all:
  vars:
    default_server_domain_name: "LV-426.local"
    server_netmask: "255.255.255.0"
    server_gateway: "10.127.83.1"
    server_dns: "8.8.8.8"
    server_subnet: "10.127.83.0"

  hosts:
    # Local host
    localhost: {}

    # PXE Server
    n2:
      ansible_user: root

################################## PXE HOSTS ##################################

# The group "pxe_hosts" is used to setup all systems that will be responsible
#  for PXE boot. This will install all of the needed capabilities to TFTP serve
#  system images.
pxe_hosts:
  hosts:
    n2:
      default_dhcp_interface: eth0

dhcp_hosts:
  hosts:
    n2:
      default_dhcp_list:
        - netmask: "{{ server_netmask }}"
          gateway: "{{ server_gateway }}"
          dns: "{{ server_dns }}"
          subnet: "{{ server_subnet }}"
          default_lease_time: 21600
          max_lease_time: 43200
          tftp_boot_path: /pxelinux.0
          tftp_server: "{{ default_tftp_server }}"
          dhcp_default_domain_name: "{{ default_server_domain_name }}"

################################# PXE TARGETS #################################

# The group "pxe_servers" is used for all servers that will be a PXE target.
pxe_servers:
  hosts:
    n1:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n1'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.167
      server_model: PowerEdge R710
      server_mac_address: 00:26:b9:56:b7:e9
      server_extra_options: ''
      server_fixed_addr: "10.127.83.100"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n2:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n2'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.168
      server_model: PowerEdge R710
      server_mac_address: A4:BA:DB:0F:36:BC
      server_extra_options: ''
      server_fixed_addr: "10.127.83.101"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n3:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n3'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.169
      server_model: PowerEdge R710
      server_mac_address: a4:ba:db:0f:25:e7
      server_extra_options: ''
      server_fixed_addr: "10.127.83.102"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n4:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n4'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.171
      server_model: PowerEdge R710
      server_mac_address: a4:ba:db:14:dc:47
      server_extra_options: ''
      server_fixed_addr: "10.127.83.103"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n5:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n5'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.172
      server_model: PowerEdge R710
      server_mac_address: a4:ba:db:14:7e:57
      server_extra_options: ''
      server_fixed_addr: "10.127.83.104"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n6:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n6'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.173
      server_model: PowerEdge R710
      server_mac_address: 00:26:b9:54:33:5f
      server_extra_options: ''
      server_fixed_addr: "10.127.83.105"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n7:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n7'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.174
      server_model: PowerEdge R710
      server_mac_address: 00:26:b9:34:33:8f
      server_extra_options: ''
      server_fixed_addr: "10.127.83.106"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n8:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n8'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.196
      server_model: PowerEdge R515
      server_mac_address: 04:7d:7b:41:63:ec
      server_extra_options: ''
      server_fixed_addr: "10.127.83.107"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n9:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n9'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.197
      server_model: PowerEdge R515
      server_mac_address: 04:7d:7b:41:63:dd
      server_extra_options: ''
      server_fixed_addr: "10.127.83.108"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n10:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n10'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.199
      server_model: PowerEdge R515
      server_mac_address: 04:7d:7b:41:64:5e
      server_extra_options: ''
      server_fixed_addr: "10.127.83.109"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n11:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n11'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.244
      server_model: PowerEdge R710
      server_mac_address: a4:ba:db:0b:f5:ad
      server_extra_options: ''
      server_fixed_addr: "10.127.83.110"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n12:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n12'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.245
      server_model: PowerEdge R710
      server_mac_address: a4:ba:db:28:5e:ff
      server_extra_options: ''
      server_fixed_addr: "10.127.83.111"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n13:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n13'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.246
      server_model: PowerEdge R710
      server_mac_address: 00:26:b9:45:7b:1b
      server_extra_options: ''
      server_fixed_addr: "10.127.83.112"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n14:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n14'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.247
      server_model: PowerEdge R710
      server_mac_address: 00:24:e8:56:2c:a8
      server_extra_options: ''
      server_fixed_addr: "10.127.83.113"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n15:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n15'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.248
      server_model: PowerEdge R710
      server_mac_address: 00:24:e8:56:2f:40
      server_extra_options: ''
      server_fixed_addr: "10.127.83.114"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n16:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n16'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.249
      server_model: PowerEdge R710
      server_mac_address: 00:24:e8:56:1f:57
      server_extra_options: ''
      server_fixed_addr: "10.127.83.115"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n17:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n17'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.250
      server_model: PowerEdge R710
      server_mac_address: 00:24:e8:4f:d7:b6
      server_extra_options: ''
      server_fixed_addr: "10.127.83.123"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n18:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n18'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.251
      server_model: PowerEdge R710
      server_mac_address: 00:24:e8:6f:65:cb
      server_extra_options: ''
      server_fixed_addr: "10.127.83.117"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n19:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n19'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.252
      server_model: PowerEdge R710
      server_mac_address: 84:2b:2b:4f:36:e8
      server_extra_options: ''
      server_fixed_addr: "10.127.83.118"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n20:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n20'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.253
      server_model: PowerEdge R710
      server_mac_address: a4:ba:db:29:c0:7c
      server_extra_options: ''
      server_fixed_addr: "10.127.83.119"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n21:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n21'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.254
      server_model: PowerEdge R710
      server_mac_address: a4:ba:db:27:5f:69
      server_extra_options: ''
      server_fixed_addr: "10.127.83.120"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n22:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n22'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.170
      server_model: PowerEdge R710
      server_mac_address: 00:00:00:00:00:00
      server_extra_options: ''
      server_fixed_addr: "10.127.83.121"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

    n23:
      ansible_os_family: "{{ default_images[default_image_name]['image_type'] }}"
      server_hostname: 'n23'
      server_image: "ubuntu-16.04-amd64"
      server_default_interface: 'eth0'
      server_obm_ip: 10.127.83.198
      server_model: PowerEdge R515
      server_mac_address: 04:7D:7B:41:64:5B
      server_extra_options: ''
      server_fixed_addr: "10.127.83.122"
      server_domain_name: "{{ default_server_domain_name }}"
      ansible_host: "{{ server_fixed_addr }}"

user_lab_variables.yml

---
# NOTE(cloudnull): Set the default lxc container storage backend to machinectl.
lxc_container_backing_store: machinectl

# NOTE(cloudnull): Allow the deployment to overcommit based on CPU.
nova_cpu_allocation_ratio: 16.0

# NOTE(cloudnull): Minimal deployment settings. These are only needed for a
#                  minimal install. If the deployment is using beefy hardware 
#                  none of these are needed.
galera_innodb_buffer_pool_size: 16M
galera_innodb_log_buffer_size: 4M
galera_wsrep_provider_options:
 - { option: "gcache.size", value: "4M" }

galera_monitoring_allowed_source: "172.16.26.0/24 172.29.240.0/22 172.29.244.0/24"

repo_nginx_threads: 2

keystone_httpd_mpm_start_servers: 2
keystone_httpd_mpm_min_spare_threads: 2
keystone_httpd_mpm_max_spare_threads: 2
keystone_httpd_mpm_thread_limit: 2
keystone_httpd_mpm_thread_child: 2
keystone_wsgi_threads: 2
keystone_wsgi_processes_max: 2

barbican_wsgi_processes: 2
barbican_wsgi_threads: 2

cinder_wsgi_processes_max: 2
cinder_wsgi_threads: 2
cinder_wsgi_buffer_size: 16384
cinder_osapi_volume_workers_max: 2

glance_api_threads_max: 2
glance_api_threads: 2
glance_api_workers: 2
glance_registry_workers: 2

nova_wsgi_threads: 2
nova_wsgi_processes_max: 2
nova_wsgi_processes: 2
nova_wsgi_buffer_size: 16384
nova_api_threads_max: 2
nova_api_threads: 2
nova_osapi_compute_workers: 2
nova_conductor_workers: 2
nova_metadata_workers: 2

neutron_rpc_workers: 2
neutron_metadata_workers: 2
neutron_api_workers: 2
neutron_api_threads_max: 2
neutron_api_threads: 2
neutron_num_sync_threads: 2

heat_api_workers: 2
heat_api_threads_max: 2
heat_api_threads: 2
heat_wsgi_threads: 2
heat_wsgi_processes_max: 2
heat_wsgi_processes: 2
heat_wsgi_buffer_size: 16384

horizon_wsgi_processes: 2
horizon_wsgi_threads: 2
horizon_wsgi_threads_max: 2

ceilometer_notification_workers_max: 2
ceilometer_notification_workers: 2

aodh_wsgi_threads: 2
aodh_wsgi_processes_max: 2
aodh_wsgi_processes: 2

gnocchi_wsgi_threads: 2
gnocchi_wsgi_processes_max: 2
gnocchi_wsgi_processes: 2

swift_account_server_replicator_workers: 2
swift_server_replicator_workers: 2
swift_object_replicator_workers: 2
swift_account_server_workers: 2
swift_container_server_workers: 2
swift_object_server_workers: 2
swift_proxy_server_workers_max: 2
swift_proxy_server_workers_not_capped: 2
swift_proxy_server_workers_capped: 2
swift_proxy_server_workers: 2

ironic_wsgi_threads: 2
ironic_wsgi_processes_max: 2
ironic_wsgi_processes: 2

trove_api_workers_max: 2
trove_api_workers: 2
trove_conductor_workers_max: 2
trove_conductor_workers: 2
trove_wsgi_threads: 2
trove_wsgi_processes_max: 2
trove_wsgi_processes: 2

sahara_api_workers_max: 2
sahara_api_workers: 2

apply_security_hardening: false

repo_pkg_cache_url: "http://172.16.26.123:3142"

haproxy_extra_services:
  - service:
      haproxy_service_name: grafana
      haproxy_ssl: False
      haproxy_backend_nodes: "{{ groups['grafana'] | default([]) }}"
      haproxy_port: 3000  # This is set using the "grafana_port" variable
      haproxy_balance_type: tcp
  - service:
      haproxy_service_name: kibana
      haproxy_ssl: False
      haproxy_backend_nodes: "{{ groups['kibana'] | default([]) }}"
      haproxy_port: 81
      haproxy_balance_type: tcp
  - service:
      haproxy_service_name: elastic-logstash
      haproxy_ssl: False
      haproxy_backend_nodes: "{{ groups['elastic-logstash'] | default([]) }}"
      haproxy_port: 5044
      haproxy_balance_type: tcp
  - service:
      haproxy_service_name: elastic-logstash
      haproxy_ssl: False
      haproxy_backend_nodes: "{{ groups['elastic-logstash'] | default([]) }}"
      haproxy_port: 9201
      haproxy_check_port: 9200
      haproxy_backend_port: 9200
      haproxy_balance_type: tcp


## Added for ceph
cidr_networks:
  container: "172.16.26.0/24"
  tunnel: "172.29.240.0/22"
  storage: "172.29.244.0/24"

## Ceph cluster fsid (must be generated before first run)
## Generate a uuid using: python -c 'import uuid; print(str(uuid.uuid4()))'
generate_fsid: false
fsid: "654d1ad9-030d-481a-869d-1878154b55fb"

## ceph-ansible settings
## See https://github.com/ceph/ceph-ansible/tree/master/group_vars for
## additional configuration options availble.
monitor_address_block: "{{ cidr_networks.container }}"
public_network: "{{ cidr_networks.container }}"
cluster_network: "{{ cidr_networks.storage }}"
osd_scenario: collocated
journal_size: 10240 # size in MB
# ceph-ansible automatically creates pools & keys for OpenStack services
openstack_config: true
cinder_ceph_client: cinder
glance_ceph_client: glance
glance_default_store: rbd
glance_rbd_store_pool: images
nova_libvirt_images_rbd_pool: vms

ceilometer_service_port: 8777
ceilometer_service_adminuri: "{{ openstack_service_publicuri_proto|default(ceilometer_service_proto) }}://{{ external_lb_vip_address }}:{{ ceilometer_service_port }}"

profiler_overrides: &os_profiler
  profiler:
    trace_sqlalchemy: true
    enabled: true
    hmac_keys: "{{ memcached_encryption_key }}"
    connection_string: "elasticsearch://{{ internal_lb_vip_address }}:9201"
    es_doc_type: "notification"
    es_scroll_time: "2m"
    es_scroll_size: "10000"
    filter_error_trace: "false"

aodh_aodh_conf_overrides: *os_profiler
barbican_config_overrides: *os_profiler
ceilometer_ceilometer_conf_overrides: *os_profiler
cinder_cinder_conf_overrides: *os_profiler
designate_designate_conf_overrides: *os_profiler
glance_glance_api_conf_overrides: *os_profiler
gnocchi_conf_overrides: *os_profiler
heat_heat_conf_overrides: *os_profiler
horizon_config_overrides: *os_profiler
ironic_ironic_conf_overrides: *os_profiler
keystone_keystone_conf_overrides: *os_profiler
magnum_config_overrides: *os_profiler
neutron_neutron_conf_overrides: *os_profiler
nova_nova_conf_overrides: *os_profiler
octavia_octavia_conf_overrides: *os_profiler
rally_config_overrides: *os_profiler
sahara_conf_overrides: *os_profiler
swift_swift_conf_overrides: *os_profiler
tacker_tacker_conf_overrides: *os_profiler
trove_config_overrides: *os_profiler



nova_api_metadata_uwsgi_ini_overrides:
  uwsgi:
    stats: "/tmp/nova-api-metadata-uwsgi-stats.sock"

keystone_uwsgi_ini_overrides:
  uwsgi:
    stats: "/tmp/keystone-uwsgi-stats.sock"

cinder_api_uwsgi_ini_overrides:
  uwsgi:
    stats: "/tmp/cinder-api-uwsgi-stats.sock"

glance_api_uwsgi_ini_overrides:
  uwsgi:
    stats: "/tmp/glance-api-uwsgi-stats.sock"

heat_api_uwsgi_ini_overrides:
  uwsgi:
    stats: "/tmp/heat-api-uwsgi-stats.sock"

heat_api_cfn_init_overrides:
  uwsgi:
    stats: "/tmp/heat-api-cfn-uwsgi-stats.sock"

nova_api_metadata_uwsgi_ini_overrides:
  uwsgi:
    stats: "/tmp/nova-api-metadata-uwsgi-stats.sock"

nova_api_os_compute_uwsgi_ini_overrides:
  uwsgi:
    stats: "/tmp/nova-api-os-compute-uwsgi-stats.sock"

nova_placement_uwsgi_ini_overrides:
  uwsgi:
    stats: "/tmp/nova-placement-uwsgi-stats.sock"

octavia_api_uwsgi_ini_overrides:
  uwsgi:
    stats: "/tmp/octavia-api-uwsgi-stats.sock"

sahara_api_uwsgi_ini_overrides:
  uwsgi:
    stats: "/tmp/sahara-api-uwsgi-stats.sock"

ironic_api_uwsgi_ini_overrides:
  uwsgi:
    stats: "/tmp/ironic-api-uwsgi-stats.sock"

magnum_api_uwsgi_ini_overrides:
  uwsgi:
    stats: "/tmp/magnum-api-uwsgi-stats.sock"

This is really helpful...! i am going to steal couple of example form your file 👍

Excellent! Steal away @satishdotpatel :D