Adding introduction and developer quick start docs
Octavia is currently missing any documentation designed to help new developers and operators understand what we're doing with the project or how to get started using and contributing to it. This patch set aims to correct this problem. Co-Authored-By: Michael Johnson <johnsomor@gmail.com> Co-Authored-By: Leslie Lundquist <llundquist@us.ibm.com> Closes-Bug: #1558368 Change-Id: Idaa37277bd342b644a463d4a0884ea40c2e8d4f5
This commit is contained in:
Stephen Balukoff
parent
02df1f7cbc
commit
1360c197c9
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#!/bin/bash
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#
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# These instructions assume an Ubuntu-based host or VM for running devstack.
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# Please note that if you are running this in a VM, it is vitally important
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# that the underlying hardware have nested virtualization enabled or you will
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# experience very poor amphora performance.
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# Set up the packages we need. Ubuntu package manager is assumed.
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apt-get update
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apt-get install git vim -y
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# TODO(sbalukoff): Add prerequisites for other distributions.
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# Clone the devstack repo
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git clone https://github.com/openstack-dev/devstack.git $HOME/devstack
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cat <<EOF > $HOME/devstack/localrc
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enable_plugin barbican https://review.openstack.org/openstack/barbican
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enable_plugin neutron-lbaas https://review.openstack.org/openstack/neutron-lbaas
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enable_plugin octavia https://review.openstack.org/openstack/octavia
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LIBS_FROM_GIT+=python-neutronclient
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KEYSTONE_TOKEN_FORMAT=UUID
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DATABASE_PASSWORD=secretdatabase
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RABBIT_PASSWORD=secretrabbit
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ADMIN_PASSWORD=secretadmin
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SERVICE_PASSWORD=secretservice
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SERVICE_TOKEN=111222333444
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# Enable Logging
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LOGFILE=/opt/stack/logs/stack.sh.log
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VERBOSE=True
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LOG_COLOR=True
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SCREEN_LOGDIR=/opt/stack/logs
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# Pre-requisite
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ENABLED_SERVICES=key,rabbit,mysql
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# Nova
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ENABLED_SERVICES+=,n-api,n-crt,n-obj,n-cpu,n-cond,n-sch
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# Glance
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ENABLED_SERVICES+=,g-api,g-reg
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# Neutron
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ENABLED_SERVICES+=,q-svc,q-agt,q-dhcp,q-l3,q-meta,neutron
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# Enable LBaaS V2
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ENABLED_SERVICES+=,q-lbaasv2
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# Cinder (optional)
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#ENABLED_SERVICES+=,cinder,c-api,c-vol,c-sch
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# Tempest (optional)
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#ENABLED_SERVICES+=,tempest
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# Octavia
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ENABLED_SERVICES+=,octavia,o-api,o-cw,o-hm,o-hk
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EOF
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# Create the stack user
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$HOME/devstack/tools/create-stack-user.sh
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# Move everything into place
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mv $HOME/devstack /opt/stack/
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chown -R stack:stack /opt/stack/devstack/
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# Fix permissions on current tty so screens can attach
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chmod go+rw `tty`
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# Stack that stack!
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su - stack -c /opt/stack/devstack/stack.sh
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# Add environment variables for auth/endpoints
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echo 'source /opt/stack/devstack/openrc admin admin' >> /opt/stack/.bashrc
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# Drop into a shell
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exec su - stack
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@ -0,0 +1,518 @@
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..
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Copyright (c) 2016 IBM
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations
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under the License.
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======================================
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Developer / Operator Quick Start Guide
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======================================
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This document is intended for developers and operators. For an end-user guide,
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please see the end-user quick-start guide and cookbook in this documentation
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repository.
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Running Octavia in devstack
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===========================
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tl;dr
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-----
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* 8GB RAM minimum
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* "vmx" or "svm" in ``/proc/cpuinfo``
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* Ubuntu 14.04 or later
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* On that host, copy and run as root:
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``octavia/devstack/contrib/new-octavia-devstack.sh``
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System requirements
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-------------------
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Octavia in devstack with a default (non-HA) configuration will deploy one
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amphora VM per loadbalancer deployed. The current default amphora image also
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requires at least 1GB of RAM to run effectively. As such it is important that
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your devstack environment has enough resources dedicated to it to run all its
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necessary components. For most devstack environments, the limiting resource
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will be RAM. At the present time, we recommend at least 12GB of RAM for the
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standard devstack defaults, or 8GB of RAM if cinder and swift are disabled.
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More is recommended if you also want to run a couple of application server VMs
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(so that Octavia has something to load balance within your devstack
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environment).
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Also, because the current implementation of Octavia delivers load balancing
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services using amphorae that run as Nova virtual machines, it is effectively
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mandatory to enable nested virtualization. The software will work with software
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emulated CPUs, but be unusably slow. The idea is to make sure the BIOS of the
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systems you're running your devstack on have virtualization features enabled
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(Intel VT-x, AMD-V, etc.), and the virtualization software you're using exposes
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these features to the guest VM (sometimes called nested virtualization).
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For more information, see:
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http://docs.openstack.org/developer/devstack/guides/devstack-with-nested-kvm.html
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The devstack environment we recommend should be running Ubuntu Linux 14.04 or
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later. These instructions may work for other Linux operating systems or
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environments. However, most people doing development on Octavia are using
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Ubuntu for their test environment, so you will probably have the easiest time
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getting your devstack working with that OS.
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Deployment
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----------
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1. Deploy an Ubuntu 14.04 or later Linux host with at least 8GB of RAM. (This
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can be a VM, but again, make sure you have nested virtualization features
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enabled in your BIOS and virtualization software.)
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2. Copy ``devstack/contrib/new-octavia-devstack.sh`` from this source
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repository onto that host.
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3. Run new-octavia-devstack.sh as root.
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4. Deploy loadbalancers, listeners, etc. as you would with any Neutron LBaaS v2
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enabled cloud.
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Running Octavia in production
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=============================
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Notes
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-----
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Disclaimers
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___________
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This document is not a definitive guide for deploying Octavia in every
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production environment. There are many ways to deploy Octavia depending on the
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specifics and limitations of your situation. For example, in our experience,
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large production environments often have restrictions, hidden "features" or
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other elements in the network topology which mean the default Neutron
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networking stack (with which Octavia was designed to operate) must be modified
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or replaced with a custom networking solution. This may also mean that for your
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particular environment, you may need to write your own custom networking driver
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to plug into Octavia. Obviously, instructions for doing this are beyond the
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scope of this document.
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We hope this document provides the cloud operator or distribution creator with
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a basic understanding of how the Octavia components fit together practically.
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Through this, it should become more obvious how components of Octavia can be
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divided or duplicated across physical hardware in a production cloud
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environment to aid in achieving scalability and resiliency for the Octavia load
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balancing system.
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In the interest of keeping this guide somewhat high-level and avoiding
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obsolescence or operator/distribution-specific environment assumptions by
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specifying exact commands that should be run to accomplish the tasks below, we
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will instead just describe what needs to be done and leave it to the cloud
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operator or distribution creator to "do the right thing" to accomplish the task
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for their environment. If you need guidance on specific commands to run to
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accomplish the tasks described below, we recommend reading through the
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plugin.sh script in devstack subdirectory of this project. The devstack plugin
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exercises all the essential components of Octavia in the right order, and this
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guide will mostly be an elaboration of this process.
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Environment Assumptions
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_______________________
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The scope of this guide is to provide a basic overview of setting up all
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the components of Octavia in a production environment, assuming that the
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default in-tree drivers and components (including a "standard" Neutron install)
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are going to be used.
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For the purposes of this guide, we will therefore assume the following core
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components have already been set up for your production OpenStack environment:
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* Nova
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* Neutron (with Neutron LBaaS v2)
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* Glance
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* Barbican (if TLS offloading functionality is enabled)
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* Keystone
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* Rabbit
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* MySQL
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Production Deployment Walkthrough
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---------------------------------
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Create Octavia User
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___________________
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By default Octavia will use the 'neutron' user for keystone authentication, and
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the admin user for interactions with all other serivces. However, it doesn't
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actually share neutron's database or otherwise access Neutron outside of
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Neutron's API, so a dedicated 'octavia' keystone user should generally be
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created for Octavia to use.
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You must:
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* Create 'octavia' user.
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* Add the 'admin' role to this user.
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Load Balancer Network Configuration
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___________________________________
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Octavia makes use of an "LB Network" exclusively as a management network that
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the controller uses to talk to amphorae and vice versa. All the amphorae that
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Octavia deploys will have interfaces and IP addresses on this network.
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Therefore, it's important that the subnet deployed on this network be
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sufficiently large to allow for the maximum number of amphorae and controllers
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likely to be deployed throughout the lifespan of the cloud installation.
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|
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At the present time, only IPv4 subnets have been tested as the LB Network (for
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example: 172.31.0.0/16), though there are plans to eventually support IPv6
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subnets for the LB Network.
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|
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The LB Network is isolated from tenant networks on the amphorae by means of
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network namespaces on the amphorae. Therefore, operators need not be concerned
|
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about overlapping subnet ranges with tenant networks.
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|
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You must also create a Neutron security group which will be applied to amphorae
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created on the LB network. It needs to allow amphorae to send UDP heartbeat
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packets to the health monitor (by default, UDP port 5555), and ingress on the
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amphora's API (by default, TCP port 9443). It can also be helpful to allow SSH
|
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access to the amphorae from the controller for troubleshooting purposes (ie.
|
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TCP port 22), though this is not strictly necessary in production environments.
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|
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Amphorae will send periodic health checks to the controller's health manager.
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Any firewall protecting the interface on which the health manager listens must
|
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allow these packets from amphorae on the LB Network (by default, UDP port
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5555).
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|
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Finally, you need to add routing or interfaces to this network such that the
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Octavia controller (which will be described below) is able to communicate with
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hosts on this network. This also implies you should have some idea where you're
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going to run the Octavia controller components.
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|
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You must:
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|
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* Create the 'lb-mgmt-net'.
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* Assign the 'lb-mgmt-net' to the admin tenant.
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* Create a subnet and assign it to the 'lb-mgmt-net'.
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* Create neutron security group for amphorae created on the 'lb-mgmt-net'.
|
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which allows appropriate access to the amphorae.
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* Update firewall rules on the host running the octavia health manager to allow
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health check messages from amphorae.
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* Add appropriate routing to / from the 'lb-mgmt-net' such that egress is
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allowed, and the controller (to be created later) can talk to hosts on this
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network.
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|
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|
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Create Amphora Image
|
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____________________
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Octavia deploys amphorae based on a virtual machine disk image. By default we
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use the OpenStack diskimage-builder project for this. Scripts to accomplish
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this are within the diskimage-create directory of this repository. In addition
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to creating the disk image, configure a Nova flavor to use for amphorae, and
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upload the disk image to glance.
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|
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You must:
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|
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* Create amphora disk image using OpenStack diskimage-builder.
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* Create a Nova flavor for the amphorae.
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* Add amphora disk image to glance.
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* Tag the above glance disk image with 'amphora'.
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|
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Install Octavia Controller Software
|
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___________________________________
|
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This seems somewhat obvious, but the important things to note here are that you
|
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should put this somewhere on the network where it will have access to the
|
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database (to be initialized below), the oslo messaging system, and the LB
|
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network. Octavia uses the standard python setuptools, so installation of the
|
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software itself should be straightforward.
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|
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Running multiple instances of the individual Octavia controller components on
|
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seperate physical hosts is recommended in order to provide scalability and
|
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availability of the controller software.
|
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|
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One important security note: In 0.9 of Octavia, the Octavia API is designed to
|
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be consumed only by the Neutron-LBaaS v2 Octavia driver. As such, there is
|
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presently no authentication required to use the Octavia API, and therefore the
|
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Octavia API should only be accessible on trusted network segments
|
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(specifically, the segment that runs the neutron-services daemons.)
|
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|
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The Octavia controller presently consists of several components which may be
|
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split across several physical machines. For the 0.9 release of Octavia, the
|
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important (and potentially separable) components are the controller worker,
|
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housekeeper, health manager and API controller. Please see the component
|
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diagrams elsewhere in this repository's documentation for detailed descriptions
|
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of each. Please use the following table for hints on which controller
|
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components need access to outside resources:
|
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|
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+-------------------+----------------------------------------+
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| **Component** | **Resource** |
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+-------------------+------------+----------+----------------+
|
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| | LB Network | Database | OSLO messaging |
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+===================+============+==========+================+
|
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| API | No | Yes | Yes |
|
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+-------------------+------------+----------+----------------+
|
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| controller worker | Yes | Yes | Yes |
|
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+-------------------+------------+----------+----------------+
|
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| health monitor | Yes | Yes | No |
|
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+-------------------+------------+----------+----------------+
|
||||
| housekeeper | Yes | Yes | No |
|
||||
+-------------------+------------+----------+----------------+
|
||||
|
||||
In addition to talking to each other via OSLO messaging, various controller
|
||||
components must also communicate with other OpenStack components, like nova,
|
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neutron, barbican, etc. via their APIs.
|
||||
|
||||
You must:
|
||||
|
||||
* Pick appropriate host(s) to run the Octavia components.
|
||||
* Install the dependencies for Octavia.
|
||||
* Install the Octavia software.
|
||||
|
||||
|
||||
Create Octavia Keys and Certificates
|
||||
____________________________________
|
||||
Octavia presently allows for one method for the controller to communicate with
|
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amphorae: The amphora REST API. Both amphora API and Octavia controller do
|
||||
bi-directional certificate-based authentication in order to authenticate and
|
||||
encrypt communication. You must therefore create appropriate TLS certificates
|
||||
which will be used for key signing, authentication, and encryption. There is a
|
||||
helper script to do this in this repository under:
|
||||
``bin/create_certficiates.sh``
|
||||
|
||||
Please note that certificates created with this helper script may not meet your
|
||||
organization's security policies, since they are self-signed certificates with
|
||||
arbitrary bit lengths, expiration dates, etc. Operators should obviously
|
||||
follow their own security guidelines in creating these certificates.
|
||||
|
||||
In addition to the above, it can sometimes be useful for cloud operators to log
|
||||
into running amphorae to troubleshoot problems. The standard method for doing
|
||||
this is to use SSH from the host running the controller worker. In order to do
|
||||
this, you must create an SSH public/private key pair specific to your cloud
|
||||
(for obvious security reasons). You must add this keypair to nova. You must
|
||||
then also update octavia.conf with the keypair name you used when adding it to
|
||||
nova so that amphorae are initialized with it on boot.
|
||||
|
||||
See the Troubleshooting Tips section below for an example of how an operator
|
||||
can SSH into an amphora.
|
||||
|
||||
You must:
|
||||
|
||||
* Create TLS certificates for communicating with the amphorae.
|
||||
* Create SSH keys for communicating with the amphorae.
|
||||
* Add the SSH keypair to nova.
|
||||
|
||||
|
||||
Configuring Octavia
|
||||
___________________
|
||||
Going into all of the specifics of how Octavia can be configured is actually
|
||||
beyond the scope of this document. For full documentation of this, please see
|
||||
the configuration reference: :doc:`../main/configref`
|
||||
|
||||
A configuration template can be found in ``etc/octavia.conf`` in this
|
||||
repository.
|
||||
|
||||
It's also important to note that this configuration file will need to be
|
||||
updated with UUIDs of the LB network, amphora security group, amphora image
|
||||
tag, SSH key path, TLS certificate path, database credentials, etc.
|
||||
|
||||
At a minimum, the configuration should specify the following, beyond the
|
||||
defaults. Your specific environment may require more than this:
|
||||
|
||||
+-----------------------+-------------------------------+
|
||||
| Section | Configuration parameter |
|
||||
+=======================+===============================+
|
||||
| DEFAULT | transport_url |
|
||||
+-----------------------+-------------------------------+
|
||||
| database | connection |
|
||||
+-----------------------+-------------------------------+
|
||||
| certificates | ca_certificate |
|
||||
+-----------------------+-------------------------------+
|
||||
| certificates | ca_private_key |
|
||||
+-----------------------+-------------------------------+
|
||||
| certificates | ca_private_key_passphrase |
|
||||
+-----------------------+-------------------------------+
|
||||
| controller_worker | amp_boot_network_list |
|
||||
+-----------------------+-------------------------------+
|
||||
| controller_worker | amp_flavor_id |
|
||||
+-----------------------+-------------------------------+
|
||||
| controller_worker | amp_image_owner_id |
|
||||
+-----------------------+-------------------------------+
|
||||
| controller_worker | amp_image_tag |
|
||||
+-----------------------+-------------------------------+
|
||||
| controller_worker | amp_secgroup_list |
|
||||
+-----------------------+-------------------------------+
|
||||
| controller_worker | amp_ssh_key_name [#]_ |
|
||||
+-----------------------+-------------------------------+
|
||||
| controller_worker | amphora_driver |
|
||||
+-----------------------+-------------------------------+
|
||||
| controller_worker | compute_driver |
|
||||
+-----------------------+-------------------------------+
|
||||
| controller_worker | loadbalancer_topology |
|
||||
+-----------------------+-------------------------------+
|
||||
| controller_worker | network_driver |
|
||||
+-----------------------+-------------------------------+
|
||||
| haproxy_amphora | client_cert |
|
||||
+-----------------------+-------------------------------+
|
||||
| haproxy_amphora | server_ca |
|
||||
+-----------------------+-------------------------------+
|
||||
| health_manager | bind_ip |
|
||||
+-----------------------+-------------------------------+
|
||||
| health_manager | controller_ip_port_list |
|
||||
+-----------------------+-------------------------------+
|
||||
| health_manager | heartbeat_key |
|
||||
+-----------------------+-------------------------------+
|
||||
| house_keeping | spare_amphora_pool_size |
|
||||
+-----------------------+-------------------------------+
|
||||
| keystone_authtoken | admin_password |
|
||||
+-----------------------+-------------------------------+
|
||||
| keystone_authtoken | admin_tenant_name |
|
||||
+-----------------------+-------------------------------+
|
||||
| keystone_authtoken | admin_user |
|
||||
+-----------------------+-------------------------------+
|
||||
| keystone_authtoken | auth_uri |
|
||||
+-----------------------+-------------------------------+
|
||||
| keystone_authtoken | auth_version |
|
||||
+-----------------------+-------------------------------+
|
||||
| oslo_messaging | topic |
|
||||
+-----------------------+-------------------------------+
|
||||
| oslo_messaging_rabbit | rabbit_host |
|
||||
+-----------------------+-------------------------------+
|
||||
| oslo_messaging_rabbit | rabbit_userid |
|
||||
+-----------------------+-------------------------------+
|
||||
| oslo_messaging_rabbit | rabbit_password |
|
||||
+-----------------------+-------------------------------+
|
||||
|
||||
.. [#] This is technically optional, but extremely useful for troubleshooting.
|
||||
|
||||
You must:
|
||||
|
||||
* Create or update ``/etc/octavia/octavia.conf`` appropriately.
|
||||
|
||||
|
||||
Spares pool considerations
|
||||
^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
One configuration directive deserves some extra consideration in this document:
|
||||
|
||||
Depending on the specifics of your production environment, you may decide to
|
||||
run Octavia with a non-empty "spares pool." Since the time it takes to spin up
|
||||
a new amphora can be non-trivial in some cloud environments (and the
|
||||
reliability of such operations can sometimes be less than ideal), this
|
||||
directive instructs Octavia to attempt to maintain a certain number of amphorae
|
||||
running in an idle, unconfigured state. These amphora will run base amphora
|
||||
health checks and wait for configuration from the Octavia controller. The
|
||||
overall effect of this is to greatly reduce the time it takes and increase the
|
||||
reliability of deploying a new load balancing service on demand. This comes at
|
||||
the cost of having a number of deployed amphorae which consume resources but
|
||||
are not actively providing load balancing services, and at the cost of not
|
||||
being able to use Nova anti-affinity features for ACTIVE-STANDBY load
|
||||
balancer topologies.
|
||||
|
||||
|
||||
Initialize Octavia Database
|
||||
___________________________
|
||||
This is controlled through alembic migrations under the octavia/db directory in
|
||||
this repository. A tool has been created to aid in the initialization of the
|
||||
octavia database. This should be available under
|
||||
``/usr/local/bin/octavia-db-manage`` on the host on which the octavia
|
||||
controller worker is installed. Note that this tool looks at the
|
||||
``/etc/octavia/octavia.conf`` file for its database credentials, so
|
||||
initializing the database must happen after Octavia is configured.
|
||||
|
||||
It's also important to note here that all of the components of the Octavia
|
||||
controller will need direct access to the database (including the API handler),
|
||||
so you must ensure these components are able to communicate with whichever host
|
||||
is housing your database.
|
||||
|
||||
You must:
|
||||
|
||||
* Create database credentials for Octavia.
|
||||
* Add these to the ``/etc/octavia/octavia.conf`` file.
|
||||
* Run ``/usr/local/bin/octavia-db-manage upgrade head`` on the controller
|
||||
worker host to initialize the octavia database.
|
||||
|
||||
|
||||
Launching the Octavia Controller
|
||||
________________________________
|
||||
We recommend using upstart / systemd scripts to ensure the components of the
|
||||
Octavia controller are all started and kept running. It of course doesn't hurt
|
||||
to first start by running these manually to ensure configuration and
|
||||
communication is working between all the components.
|
||||
|
||||
You must:
|
||||
|
||||
* Make sure each Octavia controller component is started appropriately.
|
||||
|
||||
|
||||
Configuring Neutron LBaaS
|
||||
_________________________
|
||||
This is fairly straightforward. Neutron LBaaS needs to be directed to use the
|
||||
Octavia service provider. There should be a line like the following in
|
||||
``/etc/neutron/neutron_lbaas.conf`` file's ``[service providers]`` section:
|
||||
|
||||
::
|
||||
|
||||
service_provider = LOADBALANCERV2:Octavia:neutron_lbaas.drivers.octavia.driver.OctaviaDriver:default
|
||||
|
||||
In addition to the above you must add the octavia API ``base_url`` to the
|
||||
``[octavia]`` section of ``/etc/neutron/neutron.conf``. For example:
|
||||
|
||||
::
|
||||
|
||||
[octavia]
|
||||
base_url=http://127.0.0.1:9876
|
||||
|
||||
You must:
|
||||
|
||||
* Update ``/etc/neutron/neutron_lbaas.conf`` as described above.
|
||||
* Add the octavia API URL to ``/etc/neutron/neutron.conf``.
|
||||
|
||||
|
||||
Install Neutron-LBaaS v2 extension in Horizon
|
||||
_____________________________________________
|
||||
This isn't strictly necessary for all cloud installations, however, if yours
|
||||
makes use of the Horizon GUI interface for tenants, it is probably also a good
|
||||
idea to make sure that it is configured with the Neutron-LBaaS v2 extension.
|
||||
|
||||
You may:
|
||||
|
||||
* Install the neutron-lbaasv2 GUI extension in Horizon
|
||||
|
||||
|
||||
Test deployment
|
||||
_______________
|
||||
If all of the above instructions have been followed, it should now be possible
|
||||
to deploy load balancing services using the python neutronclient CLI,
|
||||
communicating with the neutron-lbaas v2 API.
|
||||
|
||||
Example:
|
||||
|
||||
::
|
||||
|
||||
# neutron lbaas-loadbalancer-create --name lb1 private-subnet
|
||||
# neutron lbaas-loadbalancer-show lb1 # Keep re-running this command until this shows a provisioning status of 'ACTIVE'
|
||||
# neutron lbaas-listener-create --name listener1 --loadbalancer lb1 --protocol HTTP --protocol-port 80
|
||||
|
||||
Upon executing the above, log files should indicate that an amphora is deployed
|
||||
to house the load balancer, and that this load balancer is further modified to
|
||||
include a listener. The amphora should be visible to the octavia or admin
|
||||
tenant using the ``nova list`` command, and the listener should respond on the
|
||||
load balancer's IP on port 80 (with an error 503 in this case, since no pool or
|
||||
members have been defined yet—but this is usually enough to see that the
|
||||
Octavia load balancing system is working). For more information on configuring
|
||||
load balancing services as a tenant, please see the end-user quick-start guide
|
||||
and cookbook.
|
||||
|
||||
|
||||
Troubleshooting Tips
|
||||
====================
|
||||
The troubleshooting hints in this section are meant primarily for developers
|
||||
or operators troubleshooting underlying Octavia components, rather than
|
||||
end-users or tenants troubleshooting the load balancing service itself.
|
||||
|
||||
|
||||
SSH into Amphorae
|
||||
-----------------
|
||||
If you are using the reference amphora image, it may be helpful to log into
|
||||
running amphorae when troubleshooting service problems. To do this, first
|
||||
discover the ``lb_network_ip`` address of the amphora you would like to SSH
|
||||
into by looking in the ``amphora`` table in the octavia database. Then from the
|
||||
host housing the controller worker, run:
|
||||
|
||||
::
|
||||
|
||||
ssh -i /etc/octavia/.ssh/octavia_ssh_key ubuntu@[lb_network_ip]
|
||||
|
|
@ -10,6 +10,7 @@ Getting started
|
|||
.. toctree::
|
||||
:maxdepth: 1
|
||||
|
||||
main/introduction.rst
|
||||
main/glossary.rst
|
||||
|
||||
For users
|
||||
|
|
@ -27,6 +28,7 @@ For developers
|
|||
.. toctree::
|
||||
:maxdepth: 1
|
||||
|
||||
guides/dev-quick-start.rst
|
||||
main/CONSTITUTION.rst
|
||||
main/HACKING.rst
|
||||
devref/flows.rst
|
||||
|
|
@ -38,6 +40,7 @@ For operators
|
|||
.. toctree::
|
||||
:maxdepth: 1
|
||||
|
||||
guides/dev-quick-start.rst
|
||||
main/configref.rst
|
||||
|
||||
====
|
||||
|
|
|
|||
|
|
@ -0,0 +1,152 @@
|
|||
..
|
||||
Copyright (c) 2016 IBM
|
||||
|
||||
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.
|
||||
|
||||
===================
|
||||
Introducing Octavia
|
||||
===================
|
||||
Welcome to Octavia!
|
||||
|
||||
Octavia is an open source, operator-scale load balancing solution designed to
|
||||
work with OpenStack.
|
||||
|
||||
Octavia was borne out of the Neutron LBaaS project. Its conception influenced
|
||||
the transformation of the Neutron LBaaS project, as Neutron LBaaS moved from
|
||||
version 1 to version 2. Starting with the Liberty release of OpenStack, Octavia
|
||||
has become the reference implementation for Neutron LBaaS version 2.
|
||||
|
||||
Octavia accomplishes its delivery of load balancing services by managing a
|
||||
fleet of virtual machines, containers, or bare metal servers—collectively known
|
||||
as *amphorae*\— which it spins up on demand. This on-demand, horizontal scaling
|
||||
feature differentiates Octavia from other load balancing solutions, thereby
|
||||
making Octavia truly suited "for the cloud."
|
||||
|
||||
Where Octavia fits into the OpenStack ecosystem
|
||||
-----------------------------------------------
|
||||
Load balancing is essential for enabling simple or automatic delivery scaling
|
||||
and availability. In turn, application delivery scaling and availability must
|
||||
be considered vital features of any cloud. Together, these facts imply that
|
||||
load balancing is a vital feature of any cloud.
|
||||
|
||||
Therefore, we consider Octavia to be as essential as Nova, Neutron, Glance or
|
||||
any other "core" project that enables the essential features of a modern
|
||||
OpenStack cloud.
|
||||
|
||||
In accomplishing its role, Octavia makes use of other OpenStack projects:
|
||||
|
||||
* **Nova** - For managing amphora lifecycle and spinning up compute resources
|
||||
on demand.
|
||||
* **Neutron** - For network connectivity between amphorae, tenant environments,
|
||||
and external networks.
|
||||
* **Barbican** - For managing TLS certificates and credentials, when TLS
|
||||
session termination is configured on the amphorae.
|
||||
* **Keystone** - For authentication against the Octavia API, and for Octavia to
|
||||
authenticate with other OpenStack projects.
|
||||
* **Glance** - For storing the amphora virtual machine image.
|
||||
* **Oslo** - For communication between Octavia controller components, making
|
||||
Octavia work within the standard OpenStack framework and review system, and
|
||||
project code structure.
|
||||
* **Taskflow** - Is technically part of Oslo; however, Octavia makes
|
||||
extensive use of this job flow system when orchestrating back-end service
|
||||
configuration and management.
|
||||
|
||||
Octavia is designed to interact with the components listed previously. In each
|
||||
case, we’ve taken care to define this interaction through a driver interface.
|
||||
That way, external components can be swapped out with functionally-equivalent
|
||||
replacements— without having to restructure major components of Octavia. For
|
||||
example, if you use an SDN solution other than Neutron in your environment, it
|
||||
should be possible for you to write an Octavia networking driver for your SDN
|
||||
environment, which can be a drop-in replacement for the standard Neutron
|
||||
networking driver in Octavia.
|
||||
|
||||
It is important for you to know that Octavia is not necessarily designed as a
|
||||
complete replacement for the Neutron LBaaS project. That is to say, Octavia is
|
||||
designed to "plug in" to Neutron LBaaS in the same way that any proprietary
|
||||
vendor solution would: through a Neutron LBaaS version 2 driver interface. You
|
||||
could think of Octavia as an "open source vendor" for Neutron LBaaS, rather
|
||||
than as a substitute for Neutron LBaaS. For this reason, we recommend that
|
||||
tenants configure load balancing services with Octavia through the Neutron
|
||||
LBaaS version 2 CLI and API.
|
||||
|
||||
Soon, Octavia will supplant Neutron LBaaS as the load balancing solution for
|
||||
OpenStack. At that time, third-party vendor drivers that presently "plug in"
|
||||
to Neutron LBaaS will plug in to Octavia instead. For end-users, this
|
||||
transition should be relatively seamless, because Octavia supports the Neutron
|
||||
LBaaS v2 API and it has a similar CLI interface.
|
||||
|
||||
|
||||
Octavia terminology
|
||||
-------------------
|
||||
Before you proceed further in this introduction, please note:
|
||||
|
||||
Experience shows that—within the subsegment of the IT industry that creates,
|
||||
deploys, and uses load balancing devices or services— terminology is often used
|
||||
inconsistently. To reduce confusion, the Octavia team has created a glossary of
|
||||
terms as they are defined and used within the context of the Octavia project
|
||||
and Neutron LBaaS version 2. This glossary is available here: :doc:`glossary`
|
||||
|
||||
If you are familiar with Neutron LBaaS version 1 terms and usage, it is
|
||||
especially important for you to understand how the meanings of the terms “VIP,"
|
||||
"load balancer," and "load balancing," have changed in Neutron LBaaS version 2.
|
||||
|
||||
Our use of these terms should remain consistent with the :doc:`glossary`
|
||||
throughout Octavia's documentation, in discussions held by Octavia team members
|
||||
on public mailing lists, in IRC channels, and at conferences. To avoid
|
||||
misunderstandings, it's a good idea to familiarize yourself with these glossary
|
||||
definitions.
|
||||
|
||||
|
||||
A 10,000-foot overview of Octavia components
|
||||
--------------------------------------------
|
||||
.. image:: octavia-component-overview.svg
|
||||
:width: 660px
|
||||
:alt: Octavia Component Overview
|
||||
|
||||
Octavia version 0.9 consists of the following major components:
|
||||
|
||||
* **amphorae** - Amphorae are the individual virtual machines, containers, or
|
||||
bare metal servers that accomplish the delivery of load balancing services to
|
||||
tenant application environments. In Octavia version 0.8, the reference
|
||||
implementation of the amphorae image is an Ubuntu virtual machine running
|
||||
HAProxy.
|
||||
|
||||
* **controller** - The Controller is the "brains" of Octavia. It consists of
|
||||
four sub-components, which are individual daemons. They can be run on
|
||||
separate back-end infrastructure if desired:
|
||||
|
||||
* **API Controller** - As the name implies, this subcomponent runs Octavia's
|
||||
API. It takes API requests, performs simple sanitizing on them, and ships
|
||||
them off to the controller worker over the Oslo messaging bus.
|
||||
|
||||
* **Controller Worker** - This subcomponent takes sanitized API commands from
|
||||
the API controller and performs the actions necessary to fulfill the API
|
||||
request.
|
||||
|
||||
* **Health Manager** - This subcomponent monitors individual amphorae to
|
||||
ensure they are up and running, and otherwise healthy. It also handles
|
||||
failover events if amphorae fail unexpectedly.
|
||||
|
||||
* **Housekeeping Manager** - This subcomponent cleans up stale (deleted)
|
||||
database records, manages the spares pool, and manages amphora certificate
|
||||
rotation.
|
||||
|
||||
* **network** - Octavia cannot accomplish what it does without manipulating
|
||||
the network environment. Amphorae are spun up with a network interface on the
|
||||
"load balancer network," and they may also plug directly into tenant networks
|
||||
to reach back-end pool members, depending on how any given load balancing
|
||||
service is deployed by the tenant.
|
||||
|
||||
For a more complete description of Octavia's components, please see the
|
||||
:doc:`../design/version0.5/component-design` document within this documentation
|
||||
repository.
|
||||
|
|
@ -0,0 +1,400 @@
|
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After Width: | Height: | Size: 25 KiB |
Loading…
Reference in New Issue