openstack-ansible/doc/source/developer-docs/quickstart-aio.rst

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Quick Start

All-in-one (AIO) builds are a great way to perform an OpenStack-Ansible build for:

• a development environment
• an overview of how all of the OpenStack services fit together
• a simple lab deployment

Although AIO builds aren't recommended for large production deployments, they're great for smaller proof-of-concept deployments.

Absolute minimum server resources (currently used for gate checks):

• 8 vCPU's
• 50GB free disk space on the root partition
• 8GB RAM

Recommended server resources:

• CPU/motherboard that supports hardware-assisted virtualization
• 8 CPU Cores
• 80GB free disk space on the root partition, or 60GB+ on a blank secondary disk. Using a secondary disk requires the use of the bootstrap_host_data_disk_device parameter. Please see Building an AIO for more details.
• 16GB RAM

It's possible to perform AIO builds within a virtual machine for demonstration and evaluation, but your virtual machines will perform poorly. For production workloads, multiple nodes for specific roles are recommended.

Building an AIO

There are three steps to running an AIO build, with an optional first step should you need to customize your build:

• Configuration (this step is optional)
• Install and bootstrap Ansible
• Initial host bootstrap
• Run playbooks

When building an AIO on a new server, it is recommended that all system packages are upgraded and then reboot into the new kernel:

# apt-get dist-upgrade
# reboot

Start by cloning the OpenStack-Ansible repository and changing into the repository root directory:

# git clone https://github.com/openstack/openstack-ansible \
    /opt/openstack-ansible
# cd /opt/openstack-ansible

Next switch the applicable branch/tag to be deployed from. Note that deploying from the head of a branch may result in an unstable build due to changes in flight and upstream OpenStack changes. For a test (ie not a development) build it is usually best to checkout the latest tagged version.

# # List all existing tags.
# git tag -l

# # Checkout the stable branch and find just the latest tag
# git checkout stable/mitaka
# git describe --abbrev=0 --tags

# # Checkout the latest tag from either method of retrieving the tag.
# git checkout |my_conf_val|

By default the scripts deploy all OpenStack services with sensible defaults for the purpose of a gate check, development or testing system.

Review the bootstrap-host role defaults file to see various configuration options. Deployers have the option to change how the host is bootstrapped. This is useful when you wish the AIO to make use of a secondary data disk, or when using this role to bootstrap a multi-node development environment.

The bootstrap script is pre-set to pass the environment variable BOOTSTRAP_OPTS as an additional option to the bootstrap process. For example, if you wish to set the bootstrap to re-partition a specific secondary storage device (/dev/sdb), which will erase all of the data on the device, then execute:

# export BOOTSTRAP_OPTS="bootstrap_host_data_disk_device=sdb"

Additional options may be implemented by simply concatenating them with a space between each set of options, for example:

# export BOOTSTRAP_OPTS="bootstrap_host_data_disk_device=sdb"
# export BOOTSTRAP_OPTS="${BOOTSTRAP_OPTS} bootstrap_host_ubuntu_repo=http://mymirror.example.com/ubuntu"

You may wish to change the role fetch mode. Options are "galaxy" and "git-clone". The default for this option is "galaxy".

options:

galaxy

Resolve all role dependencies using the ansible-galaxy resolver

git-clone

Clone all of the role dependencies using native git

Notes:

When doing role development it may be useful to set ANSIBLE_ROLE_FETCH_MODE to git-clone. This will provide you the ability to develop roles within the environment by modifying, patching, or committing changes using an intact git tree while the galaxy option scrubs the .git directory when it resolves a dependency.

$ export ANSIBLE_ROLE_FETCH_MODE=git-clone

The next step is to bootstrap Ansible and the Ansible roles for the development environment. Deployers can customize roles by adding variables to override the defaults in each role (see adding-galaxy-roles). Run the following to bootstrap Ansible:

# scripts/bootstrap-ansible.sh

In order for all the services to run, the host must be prepared with the appropriate disks, packages, network configuration and a base configuration for the OpenStack Deployment. This preparation is completed by executing:

# scripts/bootstrap-aio.sh

If you wish to add any additional configuration entries for the OpenStack configuration then this can be done now by editing /etc/openstack_deploy/user_variables.yml. Please see the Install Guide for more details.

Finally, run the playbooks by executing:

# scripts/run-playbooks.sh

Note

Do not execute the run-playbooks.sh more than once. If something goes wrong, it is necessary to start over as described below in the Rebuilding an AIO section. Alternatively, it may be possible to individually run each playbook rather than starting over. If any playbooks need to be re-run after the initial deploy, they should be run from the playbooks directory with the openstack-ansible command. Executing run-playbooks.sh a second time results in an inconsistent state for LXC IPtables rules and causes network connectivity issues from within containers.

The installation process will take a while to complete, but here are some general estimates:

• Bare metal systems with SSD storage: ~ 30-50 minutes
• Virtual machines with SSD storage: ~ 45-60 minutes
• Systems with traditional hard disks: ~ 90-120 minutes

Once the playbooks have fully executed, it is possible to experiment with various settings changes in /etc/openstack_deploy/user_variables.yml and only run individual playbooks. For example, to run the playbook for the Keystone service, execute:

# cd /opt/openstack-ansible/playbooks
# openstack-ansible os-keystone-install.yml

Note: The AIO bootstrap playbook will still build containers for services that are not requested for deployment, but the service will not be deployed in that container.

Rebooting an AIO

As the AIO includes all three cluster members of MariaDB/Galera, the cluster has to be re-initialized after the host is rebooted.

This is done by executing the following:

# cd /opt/openstack-ansible/playbooks
# openstack-ansible -e galera_ignore_cluster_state=true galera-install.yml

If this fails to get the database cluster back into a running state, then please make use of the Galera Cluster Recovery page in the Install Guide.

Rebuilding an AIO

Sometimes it may be useful to destroy all the containers and rebuild the AIO. While it is preferred that the AIO is entirely destroyed and rebuilt, this isn't always practical. As such the following may be executed instead:

# # Move to the playbooks directory.
# cd /opt/openstack-ansible/playbooks

# # Destroy all of the running containers.
# openstack-ansible lxc-containers-destroy.yml

# # On the host stop all of the services that run locally and not
# #  within a container.
# for i in \
       $(ls /etc/init \
         | grep -e "nova\|swift\|neutron\|cinder" \
         | awk -F'.' '{print $1}'); do \
    service $i stop; \
  done

# # Uninstall the core services that were installed.
# for i in $(pip freeze | grep -e "nova\|neutron\|keystone\|swift\|cinder"); do \
    pip uninstall -y $i; done

# # Remove crusty directories.
# rm -rf /openstack /etc/{neutron,nova,swift,cinder} \
         /var/log/{neutron,nova,swift,cinder}

# # Remove the pip configuration files on the host
# rm -rf /root/.pip

# # Remove the apt package manager proxy
# rm /etc/apt/apt.conf.d/00apt-cacher-proxy

Should an existing AIO environment need to be reinstalled, the most efficient method is to destroy the host operating system and start over. For this reason, AIOs are best run inside of some form of virtual machine or cloud guest.

Quick AIO build on Rackspace Cloud

You can automate the AIO build process with a virtual machine from the Rackspace Cloud.

First, we will need a cloud-config file that will allow us to run the build as soon as the instance starts. Save this file as user_data.yml:

#cloud-config
apt_mirror: http://mirror.rackspace.com/ubuntu/
package_upgrade: true
packages:
  - git-core
runcmd:
  - export ANSIBLE_FORCE_COLOR=true
  - export PYTHONUNBUFFERED=1
  - export REPO=https://github.com/openstack/openstack-ansible
  - export BRANCH=stable/mitaka
  - git clone -b ${BRANCH} ${REPO} /opt/openstack-ansible
  - cd /opt/openstack-ansible && scripts/bootstrap-ansible.sh
  - cd /opt/openstack-ansible && scripts/bootstrap-aio.sh
  - cd /opt/openstack-ansible && scripts/run-playbooks.sh
output: { all: '| tee -a /var/log/cloud-init-output.log' }

Feel free to customize the YAML file to meet any requirements.

We can pass this YAML file to nova and build a Cloud Server at Rackspace:

nova boot \
     --flavor general1-8 \
     --image 09de0a66-3156-48b4-90a5-1cf25a905207 \
     --key-name=public_key_name \
     --config-drive=true \
     --user-data user_data.yml
     --poll
     openstack-ansible-aio-build

Be sure to replace public_key_name with the name of the public key that to use with this instance. Within a minute or so, the instance should be running and the OpenStack-Ansible installation will be in progress.

To follow along with the progress, ssh to the running instance and execute:

tail -F /var/log/cloud-init-output.log

Reference Diagram for an AIO Build

Here is a basic diagram that attempts to illustrate what the resulting AIO deployment looks like.

This diagram is not to scale and is not even 100% accurate, this diagram was built for informational purposes only and should ONLY be used as such.

------->[ ETH0 == Public Network ]
|
V                        [  *   ] Socket Connections
[ HOST MACHINE ]                   [ <>v^ ] Network Connections
*       ^  *
|       |  |-------------------------------------------------------
|       |                                                         |
|       |---------------->[ HAProxy ]                             |
|                                 ^                               |
|                                 |                               |
|                                 V                               |
|                          (BR-Interfaces)<-------                |
|                                  ^     *      |                 |
*-[ LXC ]*--*----------------------|-----|------|----|            |
|           |                      |     |      |  | |            |
|           |                      |     |      |  | |            |
|           |                      |     |      |  | |            |
|           |                      |     |      V  * |            |
|           *                      |     |   [ Galera x3 ]        |
|        [ Memcached ]<------------|     |           |            |
*-------*[ Rsyslog ]<--------------|--|  |           *            |
|        [ Repos Server x3 ]<------|  ---|-->[ RabbitMQ x3 ]      |
|        [ Horizon x2 ]<-----------|  |  |                        |
|        [ Nova api ec2 ]<---------|--|  |                        |
|        [ Nova api os ]<----------|->|  |                        |
|        [ Nova console ]<---------|  |  |                        |
|        [ Nova Cert ]<------------|->|  |                        |
|        [ Ceilometer api ]<-------|->|  |                        |
|        [ Ceilometer collector ]<-|->|  |                        |
|        [ Cinder api ]<-----------|->|  |                        |
|        [ Glance api ]<-----------|->|  |                        |
|        [ Heat apis ]<------------|->|  | [ Loop back devices ]*-*
|        [ Heat engine ]<----------|->|  |    \        \          |
| ------>[ Nova api metadata ]     |  |  |    { LVM }  { XFS x3 } |
| |      [ Nova conductor ]<-------|  |  |       *         *      |
| |----->[ Nova scheduler ]--------|->|  |       |         |      |
| |      [ Keystone x3 ]<----------|->|  |       |         |      |
| | |--->[ Neutron agents ]*-------|--|---------------------------*
| | |    [ Neutron server ]<-------|->|          |         |      |
| | | |->[ Swift proxy ]<-----------  |          |         |      |
*-|-|-|-*[ Cinder volume ]*----------------------*         |      |
| | | |                               |                    |      |
| | | -----------------------------------------            |      |
| | ----------------------------------------- |            |      |
| |          -------------------------|     | |            |      |
| |          |                              | |            |      |
| |          V                              | |            *      |
---->[ Compute ]*[ Neutron linuxbridge ]<---| |->[ Swift storage ]-

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