Package based management has been replaced by container based management systems which help to solve the availability, management and scalability aspects of deployment. These are some of the benefits of using a containerized deployment:
OS agnostic: Ability to run on any platform, regardless of the physical host OS.- Easy to scale up/down: The operation to add/remove OpenStack compute nodes is performed through starting/stopping containers.
- Fast deployment: Containers already have binaries and configuration files so provisioning an OpenStack cluster can take few minutes.
- Easy to rollback: Installing, patching or upgrading operations are atomic, either they will successfully complete or will fail. In case of failure, they can be removed and the system is back to its old state.
- In-place updates: Instead of rolling-updates, one can follow the pattern on in-place updates. Whenever a new image is available, one can simply stop the old-container and start a new container with the latest image.
- Enabling/disabling services easily: Given that everything is containerized, adding/removing services is now like starting/stopping containers.
- Self-healing deployment: Services can be managed by Kubernetes or Docker Swarm and failed containers can be automatically restarted. This results in a self-healing deployment.
- Immutable and portable: Images once built don’t change over time. Hence, you can recreate the same setup on different days/different environments with exact same piece of code running. Also, since everything is containerized, it can be moved from one place to another with ease.
Almost all the technology giants have been shift their focus to container based architecture.
Kolla(from Greek "κολλα" which means "glue") is an OpenStack project which aims to provide production-ready containers for OpenStack deployment and management. This repository offers instructions to deploy OpenStack services through the use of Kolla installer in the following configurations:
- All-in-One: OpenStack Controller and Compute roles installed on a single CentOS Stream 8 server. This configuration is limited so it's recommended only for Development purposes.
- No High Availability: Kolla Docker Registry and OpenStack Controller role installed on a single Ubuntu Focal server. Two additional servers are provisioned with OpenStack Compute role. This configuration is useful to test distributed applications.
- Distributed: Every role is distributed among several Ubuntu servers. This configuration pretends to mimic the needs of a production environment.
The deployment process uses node bash script to mount and format additional volumes in the target Virtual Machines and other specialized scripts to setup additional roles, like the internal image registry. The undercloud Virtual Machine is used to provision other servers.
The install bash script provides instructions to deploy an All-in-One OpenStack configuration. It's possible to run this script remotely:
curl -fsSL https://raw.githubusercontent.com/electrocucaracha/openstack-multinode/master/install.sh | OS_KOLLA_NETWORK_INTERFACE=eno1 bashThis is an open project, several individuals contribute in different forms like coding, documenting, testing, spreading the word at events within others.
Thanks to all the people who already contributed!
