Overcloud¶
Note
This documentation is intended as a walk through of the configuration required for a minimal all-in-one overcloud host. If you are looking for an all-in-one environment for test or development, see Automated Setup.
Preparation¶
Use the bootstrap user described in prerequisites to access the machine.
As described in the overview, we
will use a bridge (br0) and a dummy interface (dummy0) for control
plane networking. Use the following commands to create them and assign the
bridge a static IP address of 192.168.33.3:
sudo ip l add br0 type bridge
sudo ip l set br0 up
sudo ip a add 192.168.33.3/24 dev br0
sudo ip l add dummy0 type dummy
sudo ip l set dummy0 up
sudo ip l set dummy0 master br0
This configuration is not persistent, and must be recreated if the VM is rebooted.
Installation¶
Follow the instructions in Installation to set up an Ansible control host environment. Typically this would be on a separate machine, but here we are keeping things as simple as possible.
Configuration¶
Clone the kayobe-config git repository, using the correct branch for the release you are deploying. In this example we will use the stable/2024.2 branch.
cd <base path>/src git clone https://opendev.org/openstack/kayobe-config.git -b stable/2024.2 cd kayobe-config
This repository is bare, and needs to be populated. The repository includes an example inventory, which should be removed:
git rm etc/kayobe/inventory/hosts.example
Create an Ansible inventory file and add the machine to it. In this example our
machine is called controller0. Since this is an all-in-one environment, we
add the controller to the compute group, however normally dedicated
compute nodes would be used.
etc/kayobe/inventory/hosts¶# This host acts as the configuration management Ansible control host. This must be
# localhost.
localhost ansible_connection=local
[controllers]
controller0
[compute:children]
controllers
The inventory directory also contains group variables for network interface
configuration. In this example we will assume that the machine has a single
network interface called dummy0. We will create a bridge called br0
and plug dummy0 into it. Replace the network interface configuration for
the controllers group with the following:
etc/kayobe/inventory/group_vars/controllers/network-interfaces¶# Controller interface on all-in-one network.
aio_interface: br0
# Interface dummy0 is plugged into the all-in-one network bridge.
aio_bridge_ports:
- dummy0
In this scenario a single network called aio is used. We must therefore set
the name of the default controller networks to aio:
etc/kayobe/networks.yml¶---
# Kayobe network configuration.
###############################################################################
# Network role to network mappings.
# Map all networks to the all-in-one network.
# Name of the network used for admin access to the overcloud
#admin_oc_net_name:
admin_oc_net_name: aio
# Name of the network used by the seed to manage the bare metal overcloud
# hosts via their out-of-band management controllers.
#oob_oc_net_name:
# Name of the network used by the seed to provision the bare metal overcloud
# hosts.
#provision_oc_net_name:
# Name of the network used by the overcloud hosts to manage the bare metal
# compute hosts via their out-of-band management controllers.
#oob_wl_net_name:
# Name of the network used by the overcloud hosts to provision the bare metal
# workload hosts.
#provision_wl_net_name:
# Name of the network used to expose the internal OpenStack API endpoints.
#internal_net_name:
internal_net_name: aio
# List of names of networks used to provide external network access via
# Neutron.
# Deprecated name: external_net_name
# If external_net_name is defined, external_net_names will default to a list
# containing one item, external_net_name.
#external_net_names:
external_net_names:
- aio
# Name of the network used to expose the public OpenStack API endpoints.
#public_net_name:
public_net_name: aio
# Name of the network used by Neutron to carry tenant overlay network traffic.
#tunnel_net_name:
tunnel_net_name: aio
# Name of the network used to carry storage data traffic.
#storage_net_name:
storage_net_name: aio
# Name of the network used to carry storage management traffic.
#storage_mgmt_net_name:
storage_mgmt_net_name: aio
# Name of the network used to carry swift storage data traffic.
#swift_storage_net_name:
# Name of the network used to carry swift storage replication traffic.
#swift_storage_replication_net_name:
# Name of the network used to perform hardware introspection on the bare metal
# workload hosts.
#inspection_net_name:
# Name of the network used to perform cleaning on the bare metal workload
# hosts
#cleaning_net_name:
###############################################################################
# Network definitions.
<omitted for clarity>
Next the aio network must be defined. This is done using the various
attributes described in Network Configuration. These
values should be adjusted to match the environment. The aio_vip_address
variable should be a free IP address in the same subnet for the virtual IP
address of the OpenStack API.
etc/kayobe/networks.yml¶<omitted for clarity>
###############################################################################
# Network definitions.
# All-in-one network.
aio_cidr: 192.168.33.0/24
aio_vip_address: 192.168.33.2
###############################################################################
# Network virtual patch link configuration.
<omitted for clarity>
Kayobe will automatically allocate IP addresses. In this case however, we want to ensure that the host uses the same IP address it has currently, to avoid loss of connectivity. We can do this by populating the network allocation file. Use the correct hostname and IP address for your environment.
etc/kayobe/network-allocation.yml¶---
aio_ips:
controller0: 192.168.33.3
The default OS distribution in Kayobe is CentOS. If using an Ubuntu host, set
the os_distribution variable in etc/kayobe/globals.yml to ubuntu
or rocky if using Rocky Linux..
etc/kayobe/globals.yml¶os_distribution: "ubuntu"
Kayobe uses a bootstrap user to create a stack user account. By default,
this user is centos on CentOS, rocky on Rocky and ubuntu on Ubuntu,
in line with the default user in the official cloud images. If you are using
a different bootstrap user, set the controller_bootstrap_user variable in
etc/kayobe/controllers.yml. For example, to set it to cloud-user (as
seen in MAAS):
etc/kayobe/controllers.yml¶controller_bootstrap_user: "cloud-user"
By default, on systems with SELinux disabled, Kayobe will put SELinux in
permissive mode and reboot the system to apply the change. In a test or
development environment this can be a bit disruptive, particularly when using
ephemeral network configuration. To avoid rebooting the system after enabling
SELinux, set selinux_do_reboot to false in etc/kayobe/globals.yml.
etc/kayobe/globals.yml¶selinux_do_reboot: false
In a development environment, we may wish to tune some Kolla Ansible variables. Using QEMU as the virtualisation type will be necessary if KVM is not available. Reducing the number of OpenStack service workers helps to avoid using too much memory.
etc/kayobe/kolla/globals.yml¶# Most development environments will use nested virtualisation, and we can't
# guarantee that nested KVM support is available. Use QEMU as a lowest common
# denominator.
nova_compute_virt_type: qemu
# Reduce the control plane's memory footprint by limiting the number of worker
# processes to one per-service.
openstack_service_workers: "1"
We can see the changes that have been made to the configuration.
cd <base path>/src/kayobe-config
git status
On branch master
Your branch is up to date with 'origin/master'.
Changes to be committed:
(use "git restore --staged <file>..." to unstage)
deleted: etc/kayobe/inventory/hosts.example
Changes not staged for commit:
(use "git add <file>..." to update what will be committed)
(use "git restore <file>..." to discard changes in working directory)
modified: etc/kayobe/globals.yml
modified: etc/kayobe/inventory/group_vars/controllers/network-interfaces
modified: etc/kayobe/kolla/globals.yml
modified: etc/kayobe/networks.yml
Untracked files:
(use "git add <file>..." to include in what will be committed)
etc/kayobe/inventory/hosts
etc/kayobe/network-allocation.yml
The git diff command is also helpful. Once all configuration changes have
been made, they should be committed to the kayobe-config git repository.
cd <base path>/src/kayobe-config
git add etc/kayobe/inventory/hosts etc/kayobe/network-allocation.yml
git add --update
git commit -m "All in one scenario config"
In a real environment these changes would be pushed to a central repository.
Deployment¶
We are now ready to perform a deployment.
Activate the Kayobe virtual environment:
cd <base path>/venvs/kayobe
source bin/activate
Activate the Kayobe configuration environment:
cd <base path>/src/kayobe-config
source kayobe-env
Bootstrap the control host:
kayobe control host bootstrap
Configure the overcloud host:
kayobe overcloud host configure
After this command has run, some files in the kayobe-config repository will
have changed. Kayobe performs static allocation of IP addresses, and tracks
them in etc/kayobe/network-allocation.yml. Normally there may be changes to
this file, but in this case we manually added the IP address of controller0
earlier. Kayobe uses tools provided by Kolla Ansible to generate passwords, and
stores them in etc/kayobe/kolla/passwords.yml. It is important to track
changes to this file.
cd <base path>/src/kayobe-config
git add etc/kayobe/kolla/passwords.yml
git commit -m "Add autogenerated passwords for Kolla Ansible"
Pull overcloud container images:
kayobe overcloud container image pull
Deploy overcloud services:
kayobe overcloud service deploy
Testing¶
The init-runonce script provided by Kolla Ansible (not for production) can
be used to setup some resources for testing. This includes:
some flavors
a cirros image
an external network
a tenant network and router
security group rules for ICMP, SSH, and TCP ports 8000 and 8080
an SSH key
increased quotas
For the external network, use the same subnet as before, with an allocation pool range containing free IP addresses:
pip install python-openstackclient
export EXT_NET_CIDR=192.168.33.0/24
export EXT_NET_GATEWAY=192.168.33.3
export EXT_NET_RANGE="start=192.168.33.4,end=192.168.33.254"
source "${KOLLA_CONFIG_PATH:-/etc/kolla}/admin-openrc.sh"
${KOLLA_SOURCE_PATH}/tools/init-runonce
Create a server instance, assign a floating IP address, and check that it is accessible.
openstack server create --image cirros --flavor m1.tiny --key-name mykey --network demo-net demo1
openstack floating ip create public1
The floating IP address is displayed after it is created, in this example it is
192.168.33.4:
openstack server add floating ip demo1 192.168.33.4
ssh cirros@192.168.33.4
