154 lines
6.1 KiB
Markdown
154 lines
6.1 KiB
Markdown
DevStack is a set of scripts and utilities to quickly deploy an OpenStack cloud.
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# Goals
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* To quickly build dev OpenStack environments in a clean Ubuntu or Fedora environment
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* To describe working configurations of OpenStack (which code branches work together? what do config files look like for those branches?)
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* To make it easier for developers to dive into OpenStack so that they can productively contribute without having to understand every part of the system at once
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* To make it easy to prototype cross-project features
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* To sanity-check OpenStack builds (used in gating commits to the primary repos)
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Read more at http://devstack.org (built from the gh-pages branch)
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IMPORTANT: Be sure to carefully read `stack.sh` and any other scripts you execute before you run them, as they install software and may alter your networking configuration. We strongly recommend that you run `stack.sh` in a clean and disposable vm when you are first getting started.
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# Devstack on Xenserver
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If you would like to use Xenserver as the hypervisor, please refer to the instructions in `./tools/xen/README.md`.
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# Versions
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The devstack master branch generally points to trunk versions of OpenStack components. For older, stable versions, look for branches named stable/[release] in the DevStack repo. For example, you can do the following to create a diablo OpenStack cloud:
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git checkout stable/diablo
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./stack.sh
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You can also pick specific OpenStack project releases by setting the appropriate `*_BRANCH` variables in `localrc` (look in `stackrc` for the default set). Usually just before a release there will be milestone-proposed branches that need to be tested::
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GLANCE_REPO=https://github.com/openstack/glance.git
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GLANCE_BRANCH=milestone-proposed
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# Start A Dev Cloud
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Installing in a dedicated disposable vm is safer than installing on your dev machine! To start a dev cloud:
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./stack.sh
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When the script finishes executing, you should be able to access OpenStack endpoints, like so:
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* Horizon: http://myhost/
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* Keystone: http://myhost:5000/v2.0/
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We also provide an environment file that you can use to interact with your cloud via CLI:
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# source openrc file to load your environment with osapi and ec2 creds
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. openrc
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# list instances
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nova list
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If the EC2 API is your cup-o-tea, you can create credentials and use euca2ools:
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# source eucarc to generate EC2 credentials and set up the environment
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. eucarc
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# list instances using ec2 api
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euca-describe-instances
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# Customizing
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You can override environment variables used in `stack.sh` by creating file name `localrc`. It is likely that you will need to do this to tweak your networking configuration should you need to access your cloud from a different host.
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# Database Backend
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Multiple database backends are available. The available databases are defined in the lib/databases directory.
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`mysql` is the default database, choose a different one by putting the following in `localrc`:
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disable_service mysql
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enable_service postgresql
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`mysql` is the default database.
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# RPC Backend
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Multiple RPC backends are available. Currently, this
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includes RabbitMQ (default), Qpid, and ZeroMQ. Your backend of
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choice may be selected via the `localrc`.
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Note that selecting more than one RPC backend will result in a failure.
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Example (ZeroMQ):
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ENABLED_SERVICES="$ENABLED_SERVICES,-rabbit,-qpid,zeromq"
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Example (Qpid):
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ENABLED_SERVICES="$ENABLED_SERVICES,-rabbit,-zeromq,qpid"
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# Swift
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Swift is enabled by default configured with only one replica to avoid being IO/memory intensive on a small vm. When running with only one replica the account, container and object services will run directly in screen. The others services like replicator, updaters or auditor runs in background.
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If you would like to disable Swift you can add this to your `localrc` :
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disable_service s-proxy s-object s-container s-account
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If you want a minimal Swift install with only Swift and Keystone you can have this instead in your `localrc`:
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disable_all_services
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enable_service key mysql s-proxy s-object s-container s-account
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If you only want to do some testing of a real normal swift cluster with multiple replicas you can do so by customizing the variable `SWIFT_REPLICAS` in your `localrc` (usually to 3).
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# Swift S3
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If you are enabling `swift3` in `ENABLED_SERVICES` devstack will install the swift3 middleware emulation. Swift will be configured to act as a S3 endpoint for Keystone so effectively replacing the `nova-objectstore`.
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Only Swift proxy server is launched in the screen session all other services are started in background and managed by `swift-init` tool.
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# Quantum
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Basic Setup
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In order to enable Quantum a single node setup, you'll need the following settings in your `localrc` :
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disable_service n-net
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enable_service q-svc
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enable_service q-agt
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enable_service q-dhcp
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enable_service q-l3
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enable_service q-meta
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enable_service quantum
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# Optional, to enable tempest configuration as part of devstack
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enable_service tempest
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Then run stack.sh as normal.
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If tempest has been successfully configured, a basic set of smoke tests can be run as follows:
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$ cd /opt/stack/tempest
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$ nosetests tempest/tests/network/test_network_basic_ops.py
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Multi-Node Setup
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A more interesting setup involves running multiple compute nodes, with Quantum networks connecting VMs on different compute nodes.
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You should run at least one "controller node", which should have a `stackrc` that includes at least:
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disable_service n-net
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enable_service q-svc
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enable_service q-agt
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enable_service q-dhcp
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enable_service q-l3
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enable_service q-meta
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enable_service quantum
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You likely want to change your `localrc` to run a scheduler that will balance VMs across hosts:
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SCHEDULER=nova.scheduler.simple.SimpleScheduler
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You can then run many compute nodes, each of which should have a `stackrc` which includes the following, with the IP address of the above controller node:
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ENABLED_SERVICES=n-cpu,rabbit,g-api,quantum,q-agt
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SERVICE_HOST=[IP of controller node]
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MYSQL_HOST=$SERVICE_HOST
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RABBIT_HOST=$SERVICE_HOST
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Q_HOST=$SERVICE_HOST
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