Ansible Openstack LXC Playbook

date: 2013-09-05 09:51
tags: rackspace, lxc, openstack, cloud, ansible
category: *nix

Deploy Openstack in Containers

First Pass at Ansible playbook for LXC (openstack) Containers. Make sure that you have the custom Ansible module installed on your local system prior to running the playbook.

Expect bugs and general unexplainable issues and the ever so popular API change due to general messing about with bits.

Playbook Support

OpenStack:

keystone
glance-api
glance-registry
cinder-api
cinder-scheduler
cinder-volume
nova-api
nova-api-ec2
nova-api-metadata
nova-api-os-compute
nova-compute
nova-conductor
nova-scheduler
heat-api
heat-api-cfn
heat-api-cloudwatch
heat-engine
horizon
neutron-server
neutron-dhcp-agent
neutron-metadata-agent
neutron-linuxbridge-agent

Infra:

haproxy
galara
rabbitmq
Deploy-Containers
Destroy-Containers
Clone-Container
Archive-Container
Archive-all-containers
Deploy-archived-container

Assumptions

This repo assumes that you have setup the host server that will be running the Openstack Infrastructure with three bridged network devices named: br-mgmt, br-vmnet, br-ext. Through these bridges will be used throughout the Openstack infrastructure.

The repo also relies on configuration files found in the /etc directory of this repo. If you are running ansible from an "Un-privileged" host, you can place the contents of the /etc/ directory in your home folder; this would be in a directory similar to /home/kevin/rpc_deploy/. Once you have the file in place, you will have to input the details of your environment in the rpc_user_config.yml file; please see the file for how this should look. After you have a bridged network and the files/directory in place, continue on to _Base Usage.

Base Usage

All commands must be executed from the rpc_deployment directory. From this directory you will have access to all of the playbooks, roles, and variables. It is recommended that you create an override file to contain any and all variables that you wish to override for the deployment. While the override file is is not required it will make life a bit easier.

All of the variables that you may wish to update are in the vars/ directory, however you should also be aware that services will pull in base group variables as found in inventory/group_vars.

All playbooks exist in the playbooks/ directory and are grouped in different sub-directories.

All of the keys, tokens, and passwords are in the user_variables.yml file. This file contains no preset passwords. To setup your keys, passwords, and tokens you will need to either edit this file manually or use the script pw-token-gen.py. Example:

# Generate the tokens
scripts/pw-token-gen.py --file /etc/rpc_deploy/user_variables.yml

Example usage from the rpc_deployment directory in the ansible-rpc-lxc repository

# Run setup on all hosts: 
ansible-playbook -e @vars/user_variables.yml playbooks/setup/host-setup.yml

# Run infrastructure on all hosts
ansible-playbook -e @vars/user_variables.yml playbooks/infrastructure/infrastructure-setup.yml

# Setup and configure openstack within your spec'd containers
ansible-playbook -e @vars/user_variables.yml playbooks/openstack/openstack-setup.yml

About Inventory

In ansible all things that ansible cares about are located in inventory. In the Rackspace Private Cloud all inventory is dynamically generated using the previously mentioned configuration files. While this is a dynamically generated inventory it is not 100% generated on every run. The inventory is saved in a file named, rpc_inventory.json and is located in the directory where you've located your user configuration files. On every run a backup of the inventory json file is created in both the current working directory as well as the location where the user configuration files exist. The inventory json file is a living document and is intended to grow as the environment scales in infrastructure. This means that the inventory file will be appended to as you add more nodes and or change the container affinity from within the rpc_user_config.yml file. It is recommended that the base inventory file be backed up to a safe location upon the completion of a deployment operation. While the dynamic inventory processor has guards in it to ensure that the built inventory is not adversely effected by programatic operations this does not guard against user error and or catastrophic failure.

Scaling

If you are scaling the environment using the dynamically generated inventory you should know that the inventory was designed to generate new entries in inventory and not remove entries from inventory. These playbooks will build an environment to spec so if container affinity is changed and or a node is added or removed from an environment the user configuration file will need to be modified as well as the inventory json. For this reason it is recommended that should a physical node need replacing it should be renamed the same as the previous one. This will make things easier when rebuilding the environment. Additionally if a container is needing to be replaced it is better to simply remove the misbehaving container and rebuild it using the existing inventory. The reasons that bursting up and down in openstack is less than idea when talking about the infrastructure nodes is outside the scope of this document though its safe to say that the sheer volume of moving parts within openstack make this a precarious process.

Notes

Library has an experimental Keystone module which adds keystone: support to ansible.
Library has an experimental Swift module which adds swift: support to ansible.
Library has an experimental LXC module which adds lxc: support to ansible.

License

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at:

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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