Infrastructure VMs¶

Kayobe can deploy infrastructure VMs to the seed-hypervisor. These can be used to provide supplementary services that do not run well within a containerised environment or are dependencies of the control plane.

Configuration¶

To deploy an infrastructure VM, add a new host to the the infra-vms group in the inventory:

$KAYOBE_CONFIG_PATH/inventory/infra-vms¶

 [infra-vms]
 an-example-vm

The configuration of the virtual machine should be done using host_vars. These override the group_vars defined for the infra-vms group. Most variables have sensible defaults defined, but there are a few variables which must be set.

Mandatory variables¶

All networks must have an interface defined, as described in Per-host Network Configuration. By default the VMs are attached to the admin overcloud network. If, for example, admin_oc_net_name was set to example_net, you would need to define example_net_interface. It is possible to change the list of networks that a VM is attached to by modifying infra_vm_network_interfaces. Additional interfaces can be added by setting infra_vm_network_interfaces_extra.

List of Kayobe applied defaults to required docker_container variables. Any of these variables can be overridden with a host_var.

---
###############################################################################
# Infrastructure VM configuration.

# Name of the infra VM.
infra_vm_name: "{{ inventory_hostname }}"

# Memory in MB.
infra_vm_memory_mb: "{{ 16 * 1024 }}"

# Number of vCPUs.
infra_vm_vcpus: 4

# List of volumes.
infra_vm_volumes:
  - "{{ infra_vm_root_volume }}"
  - "{{ infra_vm_data_volume }}"

# Root volume.
infra_vm_root_volume:
  name: "{{ infra_vm_name }}-root"
  pool: "{{ infra_vm_pool }}"
  capacity: "{{ infra_vm_root_capacity }}"
  format: "{{ infra_vm_root_format }}"
  image: "{{ infra_vm_root_image }}"

# Data volume.
infra_vm_data_volume:
  name: "{{ infra_vm_name }}-data"
  pool: "{{ infra_vm_pool }}"
  capacity: "{{ infra_vm_data_capacity }}"
  format: "{{ infra_vm_data_format }}"

# Name of the storage pool for the infra VM volumes.
infra_vm_pool: default

# Capacity of the infra VM root volume.
infra_vm_root_capacity: 50G

# Format of the infra VM root volume.
infra_vm_root_format: qcow2

# Base image for the infra VM root volume. Default is
# "https://cloud-images.ubuntu.com/jammy/current/jammy-server-cloudimg-amd64.img"
# when os_distribution is "ubuntu", or
# https://dl.rockylinux.org/pub/rocky/9/images/x86_64/Rocky-9-GenericCloud.latest.x86_64.qcow2
# when os_distribution is "rocky",
# or
# "https://cloud.centos.org/centos/9-stream/x86_64/images/CentOS-Stream-GenericCloud-9-20221206.0.x86_64.qcow2"
# otherwise.
infra_vm_root_image: >-
  {%- if os_distribution == 'ubuntu' %}
  https://cloud-images.ubuntu.com/jammy/current/jammy-server-cloudimg-amd64.img
  {%- elif os_distribution == 'rocky' %}
  https://dl.rockylinux.org/pub/rocky/9/images/x86_64/Rocky-9-GenericCloud.latest.x86_64.qcow2
  {%- else -%}
  https://cloud.centos.org/centos/9-stream/x86_64/images/CentOS-Stream-GenericCloud-9-20221206.0.x86_64.qcow2
  {%- endif %}

# Capacity of the infra VM data volume.
infra_vm_data_capacity: 100G

# Format of the infra VM data volume.
infra_vm_data_format: qcow2

# List of network interfaces to attach to the infra VM.
infra_vm_interfaces: "{{ network_interfaces | sort | map('net_libvirt_vm_network') | list }}"

# Hypervisor that the VM runs on.
infra_vm_hypervisor: "{{ groups['seed-hypervisor'] | first }}"

# Customise ansible_ssh_extra_args for the test that checks SSH connectivity
# after provisioning. Defaults to disabling ssh host key checking.
infra_vm_wait_connection_ssh_extra_args: '-o StrictHostKeyChecking=no'

# OS family. Needed for config drive generation.
infra_vm_os_family: "{{ 'RedHat' if os_distribution in ['centos', 'rocky'] else 'Debian' }}"

###############################################################################
# Infrastructure VM node configuration.

# User with which to access the infrastructure vm via SSH during bootstrap, in
# order to setup the Kayobe user account. Default is {{ os_distribution }}.
infra_vm_bootstrap_user: "{{ os_distribution }}"

###############################################################################
# Infrastructure VM network interface configuration.

# List of networks to which infrastructure vm nodes are attached.
infra_vm_network_interfaces: >
  {{ (infra_vm_default_network_interfaces +
      infra_vm_extra_network_interfaces) | select | unique | list }}

# List of default networks to which infrastructure vm nodes are attached.
infra_vm_default_network_interfaces: >
  {{ [admin_oc_net_name] | select | unique | list }}

# List of extra networks to which infrastructure vm nodes are attached.
infra_vm_extra_network_interfaces: []

###############################################################################
# Infrastructure VM node software RAID configuration.

# List of software RAID arrays. See mrlesmithjr.mdadm role for format.
infra_vm_mdadm_arrays: []

###############################################################################
# Infrastructure VM node encryption configuration.

# List of block devices to encrypt. See stackhpc.luks role for format.
infra_vm_luks_devices: []

###############################################################################
# Infrastructure VM node LVM configuration.

# List of infrastructure vm volume groups. See mrlesmithjr.manage_lvm role for
# format.
infra_vm_lvm_groups: "{{ infra_vm_lvm_groups_default + infra_vm_lvm_groups_extra }}"

# Default list of infrastructure vm volume groups. See mrlesmithjr.manage_lvm
# role for format.
infra_vm_lvm_groups_default: "{{ [infra_vm_lvm_group_data] if infra_vm_lvm_group_data_enabled | bool else [] }}"

# Additional list of infrastructure vm volume groups. See mrlesmithjr.manage_lvm
# role for format.
infra_vm_lvm_groups_extra: []

# Whether a 'data' LVM volume group should exist on the infrastructure vm. By
# default this contains a 'docker-volumes' logical volume for Docker volume
# storage. It will also be used for Docker container and image storage if
# 'docker_storage_driver' is set to 'devicemapper'. Default is true if
# 'docker_storage_driver' is set to 'devicemapper', or false otherwise.
infra_vm_lvm_group_data_enabled: "{{ docker_storage_driver == 'devicemapper' }}"

# Infrastructure VM LVM volume group for data. See mrlesmithjr.manage_lvm role
# for format.
infra_vm_lvm_group_data:
  vgname: data
  disks: "{{ infra_vm_lvm_group_data_disks }}"
  create: True
  lvnames: "{{ infra_vm_lvm_group_data_lvs }}"

# List of disks for use by infrastructure vm LVM data volume group. Default to
# an invalid value to require configuration.
infra_vm_lvm_group_data_disks:
  - changeme

# List of LVM logical volumes for the data volume group.
infra_vm_lvm_group_data_lvs:
  - "{{ infra_vm_lvm_group_data_lv_docker_volumes }}"

# Docker volumes LVM backing volume.
infra_vm_lvm_group_data_lv_docker_volumes:
  lvname: docker-volumes
  size: "{{ infra_vm_lvm_group_data_lv_docker_volumes_size }}"
  create: True
  filesystem: "{{ infra_vm_lvm_group_data_lv_docker_volumes_fs }}"
  mount: True
  mntp: /var/lib/docker/volumes

# Size of docker volumes LVM backing volume.
infra_vm_lvm_group_data_lv_docker_volumes_size: 75%VG

# Filesystem for docker volumes LVM backing volume. ext4 allows for shrinking.
infra_vm_lvm_group_data_lv_docker_volumes_fs: ext4

###############################################################################
# Infrastructure VM node sysctl configuration.

# Dict of sysctl parameters to set.
infra_vm_sysctl_parameters: {}

###############################################################################
# Infrastructure VM node tuned configuration.

# Builtin tuned profile to use. Format is same as that used by giovtorres.tuned
# role. Default is virtual-guest.
infra_vm_tuned_active_builtin_profile: "virtual-guest"

###############################################################################
# Infrastructure VM node user configuration.

# List of users to create. This should be in a format accepted by the
# singleplatform-eng.users role.
infra_vm_users: "{{ users_default }}"

###############################################################################
# Infrastructure VM node firewalld configuration.

# Whether to install and enable firewalld.
infra_vm_firewalld_enabled: false

# A list of zones to create. Each item is a dict containing a 'zone' item.
infra_vm_firewalld_zones: []

# A firewalld zone to set as the default. Default is unset, in which case the
# default zone will not be changed.
infra_vm_firewalld_default_zone:

# A list of firewall rules to apply. Each item is a dict containing arguments
# to pass to the firewalld module. Arguments are omitted if not provided, with
# the following exceptions:
# - offline: true
# - permanent: true
# - state: enabled
infra_vm_firewalld_rules: []

###############################################################################
# Infrastructure VM node swap configuration.

# List of swap devices. Each item is a dict containing a 'device' item.
infra_vm_swap: []

Customisations¶

Examples of common customisations are shown below.

By default the Ansible inventory name is used as the name of the VM. This may be overridden via infra_vm_name:

$KAYOBE_CONFIG_PATH/inventory/host_vars/an-example-vm¶

 # Name of the infra VM.
 infra_vm_name: "the-special-one"

By default the VM has 16G of RAM. This may be changed via infra_vm_memory_mb:

$KAYOBE_CONFIG_PATH/inventory/host_vars/an-example-vm¶

 # Memory in MB. Defaults to 16GB.
 infra_vm_memory_mb: "{{ 8 * 1024 }}"

The default network configuration attaches infra VMs to the admin network. If this is not appropriate, modify infra_vm_network_interfaces. At a minimum the network interface name for the network should be defined.

$KAYOBE_CONFIG_PATH/inventory/host_vars/an-example-vm¶

 # Network interfaces that the VM is attached to.
 infra_vm_network_interfaces:
   - aio

 # Mandatory: All networks must have an interface defined.
 aio_interface: eth0

 # By default kayobe will connect to a host via ``admin_oc_net``.
 # As we have not attached this VM to this network, we must override
 # ansible_host.
 ansible_host: "{{ 'aio' | net_ip }}"

Configuration for all VMs can be set using extra_vars defined in $KAYOBE_CONFIG_PATH/infra-vms.yml. Note that normal Ansible precedence rules apply and the variables will override any host_vars. If you need to override the defaults, but still maintain per-host settings, use group_vars instead.

Deploying the virtual machine¶

Once the initial configuration has been done follow the steps in Infrastructure VMs.

Infrastructure VMs

Infrastructure VMs¶

Configuration¶

Mandatory variables¶

Customisations¶

Deploying the virtual machine¶

kayobe 13.6.1.dev3

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