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multi-node-aio

README.rst

OpenStack-Ansible Multi-Node AIO

Date: 2022-01-12
tags:rackspace, openstack, ansible
category:*openstack, *nix

About this repository

Full OpenStack deployment using a single OnMetal host from the Rackspace Public Cloud. This is a multi-node installation using VMs that have been PXE booted which was done to provide an environment that is almost exactly what is in production. This script will build, kick and deploy OpenStack using KVM, OpenStack-Ansible within 12 Nodes and 1 load balancer all using a Hyper Converged environment.

Process

Create at least one physical host that has public network access and is running an Ubuntu 20.04 LTS Operating system. System assumes that you have an unpartitioned device with at least 1TB of storage, however you can customize the size of each VM volume by setting the option ${VM_DISK_SIZE}. If you're using the Rackspace OnMetal servers the drive partitioning will be done for you by detecting the largest unpartitioned device. If you wish to use a different device, then set the mnaio_data_disk extra var when running the playbooks or by exporting the extra var before running build.sh, eg:

export MNAIO_ANSIBLE_PARAMETERS="-e mnaio_data_disk=sdb"
./build.sh

NVMe partitions generally show a p before the partition number. The default suffix of 1 for sdb1 can be changed to p1 to support NVMe naming conventions using the mnaio_data_disk_suffix extra var shown here:

export MNAIO_ANSIBLE_PARAMETERS="-e mnaio_data_disk=nvme0n1 -e mnaio_data_disk_suffix=p1"
./build.sh

The playbooks will look for a volume group named "vg01", if this volume group exists no partitioning or setup on the data disk will take place. To effectively use this process for testing it's recommended that the host machine have at least 32GiB of RAM.

Physical Host Specs known to work well
CPU CORES MEMORY DISK SPACE
20 124GB 1.3TB

Deployments default to the ML2/LinuxBridge network plugin. Available options at this time include:

  • ML2/LinuxBridge
  • ML2/Open Virtual Network (OVN)
  • ML2/Open vSwitch w/ DVR (OVS)

To deploy an MNAIO with support for OVN, set the following parameter(s) prior to executing the build:

export MNAIO_ANSIBLE_PARAMETERS="-e osa_enable_networking_ovn=true"
./build.sh

To deploy an MNAIO with support for OVS+DVR, set the following parameter(s) prior to executing the build:

export MNAIO_ANSIBLE_PARAMETERS="-e osa_enable_networking_ovs_dvr=true"
./build.sh

To deploy an MNAIO without LXC, set the following parameter(s) prior to executing the build:

export MNAIO_ANSIBLE_PARAMETERS="-e osa_no_containers=true"
./build.sh

When your ready, run the build script by executing bash ./build.sh. The build script current executes a deployment of OpenStack Ansible using the master branch. If you want to do something other than deploy master you can set the ${OSA_BRANCH} variable to any branch, tag, or SHA.

Post Deployment

Once deployed you can use virt-manager to manage the KVM instances on the host, similar to a DRAC or ILO.

LINUX:
If you're running a linux system as your workstation simply install virt-manager from your package manager and connect to the host via QEMU/KVM:SSH
OSX:
If you're running a MAC you can install https://www.xquartz.org/ to have access to a X11 client, then make use of X over SSH to connect to the virt-manager application. Using X over SSH is covered in https://www.cyberciti.biz/faq/apple-osx-mountain-lion-mavericks-install-xquartz-server/
WINDOWS:
If you're running Windows, you can install virt-viewer from the KVM Download site. https://virt-manager.org/download/

Deployment screenshot

Screen shot of virt-manager and deployment in action

Deployments can be accessed and monitored via virt-manager

Console Access

Screen shot of virt-manager console

The root password for all VMs is "secrete". This password is being set within the pre-seed files under the "Users and Password" section. If you want to change this password please edit the pre-seed files.

build.sh Options

Set an external inventory used for the MNAIO:
MNAIO_INVENTORY=${MNAIO_INVENTORY:-playbooks/inventory}
Set to instruct the preseed what the default network is expected to be:
DEFAULT_NETWORK="${DEFAULT_NETWORK:-eth0}"
Set the VM disk size in gigabytes:
VM_DISK_SIZE="${VM_DISK_SIZE:-92160}"
Instruct the system do all of the required host setup:
SETUP_HOST=${SETUP_HOST:-true}
Instruct the system do all of the required PXE setup:
SETUP_PXEBOOT=${SETUP_PXEBOOT:-true}
Instruct the system do all of the required DHCPD setup:
SETUP_DHCPD=${SETUP_DHCPD:-true}
Instruct the system to Kick all of the VMs:
DEPLOY_VMS=${DEPLOY_VMS:-true}
Instruct the VM to use the selected image, eg. ubuntu-18.04-amd64:
DEFAULT_IMAGE=${DEFAULT_IMAGE:-ubuntu-18.04-amd64}
Instruct the VM to use the selected kernel meta package, eg. linux-generic:
DEFAULT_KERNEL=${DEFAULT_KERNEL:-linux-image-generic}
Set the OSA repo for this script to retrieve:
OSA_REPO=${OSA_REPO:-https://opendev.org/openstack/openstack-ansible}
Set the openstack-ansible-ops repo to retrieve for the ELK stack:
OS_OPS_REPO=${OS_OPS_REPO:-https://opendev.org/openstack/openstack-ansible-ops}
Set the OSA branch for this script to deploy:
OSA_BRANCH=${OSA_BRANCH:-master}
Set the openstack-ansible-ops branch for this script to deploy:
OS_OPS_BRANCH=${OS_OPS_BRANCH:-master}
Instruct the system to deploy OpenStack Ansible:
DEPLOY_OSA=${DEPLOY_OSA:-true}
Instruct the system to deploy the ELK Stack:
DEPLOY_ELK=${DEPLOY_ELK:-false}
Instruct the system to pre-config the envs for running OSA playbooks:
PRE_CONFIG_OSA=${PRE_CONFIG_OSA:-true}

Instruct the system to run the OSA playbooks, if you want to deploy other OSA powered cloud, you can set it to false:

RUN_OSA=${RUN_OSA:-true}
Instruct the system to run the ELK playbooks:
RUN_ELK=${RUN_ELK:-false}

Instruct the system to configure the completed OpenStack deployment with some example flavors, images, networks, etc.:

CONFIGURE_OPENSTACK=${CONFIGURE_OPENSTACK:-true}

Instruct the system to configure iptables prerouting rules for connecting to VMs from outside the host:

CONFIG_PREROUTING=${CONFIG_PREROUTING:-true}
Insrtuct the system to use a different Ubuntu mirror:
DEFAULT_MIRROR_HOSTNAME=${DEFAULT_MIRROR_HOSTNAME:-archive.ubuntu.com}
Instruct the system to use a different Ubuntu mirror base directory:
DEFAULT_MIRROR_DIR=${DEFAULT_MIRROR_DIR:-/ubuntu}
Instruct the system to use a set amount of ram for cinder VM type:
CINDER_VM_SERVER_RAM=${CINDER_VM_SERVER_RAM:-2048}
Instruct the system to use a set amount of ram for compute VM type:
COMPUTE_VM_SERVER_RAM=${COMPUTE_VM_SERVER_RAM:-8196}
Instruct the system to use a set amount of ram for infra VM type:
INFRA_VM_SERVER_RAM=${INFRA_VM_SERVER_RAM:-16384}
Instruct the system to use a set amount of ram for load balancer VM type:
LOADBALANCER_VM_SERVER_RAM=${LOADBALANCER_VM_SERVER_RAM:-1024}
Instruct the system to use a set amount of ram for the logging VM type:
LOGGING_VM_SERVER_RAM=${LOGGING_VM_SERVER_RAM:-1024}
Instruct the system to use a set amount of ram for the swift VM type:
SWIFT_VM_SERVER_RAM=${SWIFT_VM_SERVER_RAM:-1024}
Instruct the system where to obtain iPXE kernels (looks for ipxe.lkrn, ipxe.efi, etc):
IPXE_KERNEL_BASE_URL=${IPXE_KERNEL_BASE_URL:-'http://boot.ipxe.org'}
Instruct the system to use a customized iPXE script during boot of VMs:
IPXE_PATH_URL=${IPXE_PATH_URL:-''}
Instruct the system to use CEPH block & object storage instead of the default LVM/swift:
ENABLE_CEPH_STORAGE=${ENABLE_CEPH_STORAGE:-false}

Re-kicking VM(s)

To re-kick all VMs, simply re-execute the deploy-vms.yml playbook and it will do it automatically. The ansible --limit parameter may be used to selectively re-kick a specific VM.

ansible-playbook -i playbooks/inventory playbooks/deploy-vms.yml

Rerunning the build script

The build script can be rerun at any time. By default it will re-kick the entire system, destroying all existing VM's.

Deploying OpenStack into the environment

While the build script will deploy OpenStack, you can choose to run this manually. To run a basic deploy using a given branch you can use the following snippet. Set the ansible option osa_branch or export the environment variable OSA_BRANCH when using the build.sh script.

ansible-playbook -i playbooks/inventory playbooks/deploy-osa.yml -vv -e 'osa_branch=master'

Snapshotting an environment before major testing

Running a snapshot on all of the vms before doing major testing is wise as it'll give you a restore point without having to re-kick the cloud. You can do this using some basic virsh commands and a little bash.

for instance in $(virsh list --all --name); do
  virsh snapshot-create-as --atomic --name $instance-kilo-snap --description "saved kilo state before liberty upgrade" $instance
done

Once the previous command is complete you'll have a collection of snapshots within all of your infrastructure hosts. These snapshots can be used to restore state to a previous point if needed. To restore the infrastructure hosts to a previous point, using your snapshots, you can execute a simple virsh command or the following bash loop to restore everything to a known point.

for instance in $(virsh list --all --name); do
  virsh snapshot-revert --snapshotname $instance-kilo-snap --running $instance
done

Saving VM images for re-use on another host

If you wish to save the current images in order to implement a thin-provisioned set of VM's which can be saved and re-used, then use the save-vms.yml playbook. This will stop the VM's and rename the files to *-base.img. Re-executing the deploy-vms.yml playbook afterwards will rebuild the VMs from those images.

ansible-playbook -i playbooks/inventory playbooks/save-vms.yml
ansible-playbook -i playbooks/inventory playbooks/deploy-vms.yml

To disable this default functionality when re-running build.sh set the build not to use the images as follows.

export MNAIO_ANSIBLE_PARAMETERS="-e vm_use_snapshot=no"
./build.sh

If you have previously saved some images to remote storage then, if they are available via a URL, they can be downloaded and used on a fresh host as follows.

# First prepare the host and get the base services started
./bootstrap.sh
source ansible-env.rc
export ANSIBLE_PARAMETERS="-i playbooks/inventory"
ansible-playbook ${ANSIBLE_PARAMETERS} playbooks/setup-host.yml
ansible-playbook ${ANSIBLE_PARAMETERS} playbooks/deploy-acng.yml playbooks/deploy-pxe.yml playbooks/deploy-dhcp.yml

# Then download the images
export IMAGE_MANIFEST_URL="http://example.com/images/manifest.json"
ansible-playbook ${ANSIBLE_PARAMETERS} playbooks/download-vms.yml -e manifest_url=${IMAGE_MANIFEST_URL}

# Then kick off the VM's from those images
ansible-playbook ${ANSIBLE_PARAMETERS} playbooks/deploy-vms.yml

Using Ceph-backed Block and Object Storage

To make use of Ceph in the environment, set ENABLE_CEPH_STORAGE to true. This will disable the use of Swift as the Object Storage back-end and disable the use of LVM as the Block Storage back-end, replacing both of these with Ceph services.