Software Factory’s architecture is modular and defined in a single file called arch.yaml. This file defines how services are deployed. Each host declares:
- A hostname,
- An IP address,
- An optional public_url, and
- A list of components.
For example, to add a new zuul-merger, start a new instance inside the internal network of the deployment, enable ssh connections by copying the install server root user public ssh key to the authorized_keys of the new instance and update the arch.yaml with:
vim /etc/software-factory/arch.yaml # Add new host: - name: zm02 ip: 192.168.0.XXX roles: - zuul-merger sfconfig
The architecture is defined in /etc/software-factory/arch.yaml:
inventory: - name: node01 ip: 192.168.240.10 roles: - install-server - mysql - name: node02 ip: 192.168.240.11 roles: - gerrit
Any modification to the arch.yaml file needs to be manually applied with the sfconfig script. Run sfconfig after saving the sfconfig.yaml file.
The minimal architecture includes following components:
Optional services can be enabled:
Check the nodepool documentation to learn how to configure the hypervisor-runc role to enable container providers in Nodepool.
Extending the architecture¶
To deploy a specific service on a dedicated instance:
- Start a new instance on the same network as the install-server with the desired flavor
- Attach a dedicated volume if needed
- Make sure other instances security group allows network access from the new instance
- Add the root public ssh key (install-server:/root/.ssh/id_rsa.pub) to the new instance /root/.ssh/authorized_keys,
- Make sure the new instance’s ssh service is configured to allow public key authentication,
- Add the new instance to the arch inventory and set its IP address,
- Add desired services in the roles list (e.g., elasticsearch), and
- Run sfconfig to reconfigure the deployment.
See sf-config/refarch directory for examples of valid architectures.
Migrate a service to a dedicated instance¶
This procedure demonstrates how to run the log indexation services (ELK stack) on a dedicated instance:
- First stop and disable all elk related services (elasticsearch, logstash, kibana, log-gearman-client and log-gearman-worker)
- Copy the current data, e.g.: rsync -a /var/lib/elasticsearch/ new_instance_ip:/var/lib/elasticsearch/
- Add the new instances and roles to the /etc/software-factory/arch.yaml file:
inventory: - name: elk ip: new_instance_ip roles: - elasticsearch - logstash - kibana - log-gearman-client - log-gearman-worker
- Run sfconfig to apply the architecture modification