100 lines
3.5 KiB
ReStructuredText
100 lines
3.5 KiB
ReStructuredText
=============
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Cloud in a VM
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=============
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Use the cloud to build the cloud! Use your cloud to launch new versions
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of OpenStack in about 5 minutes. When you break it, start over! The VMs
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launched in the cloud will be slow as they are running in QEMU
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(emulation), but their primary use is testing OpenStack development and
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operation. Speed not required.
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Prerequisites Cloud & Image
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---------------------------
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Virtual Machine
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~~~~~~~~~~~~~~~
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DevStack should run in any virtual machine running a supported Linux
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release. It will perform best with 2Gb or more of RAM.
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OpenStack Deployment & cloud-init
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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If the cloud service has an image with ``cloud-init`` pre-installed, use
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it. You can get one from `Ubuntu's Daily
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Build <http://uec-images.ubuntu.com>`__ site if necessary. This will
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enable you to launch VMs with userdata that installs everything at boot
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time. The userdata script below will install and run DevStack with a
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minimal configuration. The use of ``cloud-init`` is outside the scope of
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this document, refer to the ``cloud-init`` docs for more information.
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If you are directly using a hypervisor like Xen, kvm or VirtualBox you
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can manually kick off the script below as a non-root user in a
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bare-bones server installation.
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Installation shake and bake
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---------------------------
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Launching With Cloud-Init
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~~~~~~~~~~~~~~~~~~~~~~~~~
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This cloud config grabs the latest version of DevStack via git, creates
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a minimal ``local.conf`` file and kicks off ``stack.sh``. It should be
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passed as the user-data file when booting the VM.
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::
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#cloud-config
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users:
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- default
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- name: stack
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lock_passwd: False
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sudo: ["ALL=(ALL) NOPASSWD:ALL\nDefaults:stack !requiretty"]
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shell: /bin/bash
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write_files:
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- content: |
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#!/bin/sh
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DEBIAN_FRONTEND=noninteractive sudo apt-get -qqy update || sudo yum update -qy
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DEBIAN_FRONTEND=noninteractive sudo apt-get install -qqy git || sudo yum install -qy git
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sudo chown stack:stack /home/stack
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cd /home/stack
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git clone https://git.openstack.org/openstack-dev/devstack
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cd devstack
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echo '[[local|localrc]]' > local.conf
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echo ADMIN_PASSWORD=password >> local.conf
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echo MYSQL_PASSWORD=password >> local.conf
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echo RABBIT_PASSWORD=password >> local.conf
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echo SERVICE_PASSWORD=password >> local.conf
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echo SERVICE_TOKEN=tokentoken >> local.conf
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./stack.sh
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path: /home/stack/start.sh
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permissions: 0755
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runcmd:
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- su -l stack ./start.sh
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As DevStack will refuse to run as root, this configures ``cloud-init``
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to create a non-root user and run the ``start.sh`` script as that user.
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Launching By Hand
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~~~~~~~~~~~~~~~~~
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Using a hypervisor directly, launch the VM and either manually perform
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the steps in the embedded shell script above or copy it into the VM.
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Using OpenStack
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~~~~~~~~~~~~~~~
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At this point you should be able to access the dashboard. Launch VMs and
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if you give them floating IPs access those VMs from other machines on
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your network.
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One interesting use case is for developers working on a VM on their
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laptop. Once ``stack.sh`` has completed once, all of the pre-requisite
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packages are installed in the VM and the source trees checked out.
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Setting ``OFFLINE=True`` in ``local.conf`` enables ``stack.sh`` to run
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multiple times without an Internet connection. DevStack, making hacking
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at the lake possible since 2012!
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