I was recently looking to deploy a minimal installation of OpenStack to use as a development environment and to minimise the complexity of installing a complete OpenStack environment where I can build and tear down the environment with minimal effort. This is where DevStack comes into play, as to quote:
DevStack is a series of extensible scripts used to quickly bring up a complete OpenStack environment based on the latest versions of everything from git master. It is used interactively as a development environment and as the basis for much of the OpenStack project’s functional testing.
For my minimal installation of DevStack I am using new installation of Ubuntu Server 16.10 (clean installation and isolated instance recommended due to significant changes to the system). In terms of hardware configuration, the following recommendations are provided. However, this will all be dependant on your use case for DevStack and what you require to achieve and DevStack may also be installed without satisfying the below criteria but you may experience performance/stability issues.
- Processor – at least 2 cores
- Memory – at least 8GB
- Hard Drive – at least 60GB
First of all we will create a user account named ‘stack’ to install DevStack and grant the user sudo privileges with the no password parameter. It is important in this step that we do not complete the installation as the root user.
sudo adduser stack echo "stack ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
Now log out as the current user and reconnect as the ‘stack’ user created in the previous step and clone the repository to the current directory, in this example i am changing the directory to ‘/var’ to create my local copy.
cd /var sudo git clone git://github.com/openstack-dev/devstack.git
We will now need to create a configuration file (/var/local.conf) to specify user configuration variables to use when the installation script (/var/devstack/stack.sh) is executed in a subsequent step. The installation will complete without
The below example, contains only password variables so that you are not required to input the values at installation. For a more detailed configuration file containing additional parameters, check out the sample from the respoistory.
cd /var/devstack sudo vi local.conf
[[local|localrc]] ADMIN_PASSWORD=openstack DATABASE_PASSWORD=$ADMIN_PASSWORD RABBIT_PASSWORD=$ADMIN_PASSWORD SERVICE_PASSWORD=$ADMIN_PASSWORD
Once the configuration file has been created, we can now execute the installation script (stack.sh). The installation process will take approximately 15-20 minutes to complete to which will receive console output. Once the installation has completed you will receive an installation summary, URLs, accounts and passwords.
./stack.sh
Once the installation has completed successfully you should be able to browse to the Horizon dashboard and authenticate with the admin credentials configured during installation, at http://{ip address}/dashboard.
If you need to remove the installation of DevStack there is a script included in the repository (./clean.sh) which will remove the installation of DevStack and dependancies and then cleanup the directories touched by the installation. For a detailed list of impacted files and directories during the installation refer to this link.
cd /var/devstack ./clean.sh rm -rf /opt/stack rm -rf /usr/local/bin
From my initial attempt at installation, I encountered a number of issues which appear to be permission related I believe this was due to not cloning the repository as the ‘stack’ user account used for the installation. In this case, to resolve you could run the below or alternatively clean-up your installation process and repeat the installation.
sudo chown -R stack:stack /var/devstack sudo chmod 770 /var/devstack
Deans Blog 