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OpenStack-Helm Gates

To facilitate ease of testing and debugging, information regarding gates and their functionality can be found here.

OpenStack-Helm’s single node and multinode gates leverage the kubeadm-aio environment created and maintained for use as a development environment. All information regarding the kubeadm-aio environment can be found here.

Gate Checks

OpenStack-Helm currently checks the following scenarios:

  • Testing any documentation changes and impacts.

  • Running Make on each chart, which lints and packages the charts. This gate does not stand up a Kubernetes cluster.

  • Provisioning a single node cluster and deploying the OpenStack services. This check is provided for: Ubuntu-1604, CentOS-7, and Fedora-25.

  • Provisioning a multi-node Ubuntu-1604 cluster and deploying the OpenStack services. This check is provided for both a two node cluster and a three node cluster.

Gate Functions

To provide reusable components for gate functionality, functions have been provided in the gates/funcs directory. These functions include:

  • Functions for common host preparation operations, found in common.sh

  • Functions for Helm specific operations, found in helm.sh. These functions include: installing Helm, serving a Helm repository locally, linting and building all Helm charts, running Helm tests on a release, installing the helm template plugin, and running the helm template plugin against a chart.

  • Functions for Kubernetes specific operations, found in kube.sh. These functions include: waiting for pods in a specific namespace to register as ready, waiting for all nodes to register as ready, install the requirements for the kubeadm-aio container used in the gates, building the kubeadm-aio container, launching the kubeadm-aio container, and replacing the kube-controller-manager with a specific image necessary for ceph functionality.

  • Functions for network specific operations, found in network.sh. These functions include: creating a backup of the host’s resolv.conf file before deploying the kubeadm environments, restoring the original resolv.conf settings, creating a backup of the host’s /etc/hosts file before adding the hosts interface and address, and restoring the original /etc/hosts file.

  • Functions for OpenStack specific operations, found in openstack.sh. These functions include: waiting for a successful ping, and waiting for a booted virtual machine’s status to return as ACTIVE.

Any additional functions required for testing new charts or improving the gate workflow should be placed in the appropriate location.

Gate Output

To provide meaningful output from the gates, all information pertaining to the components of the cluster and workflow are output to the logs directory inside each gate. The contents of the log directory are as follows:

  • The dry-runs directory contains the rendered output of Helm dry-run installs on each of the OpenStack service charts. This gives visibility into the manifests created by the templates with the supplied values. When the dry-run gate fails, the reason should be apparent in the dry-runs output. The logs found here are helpful in identifying issues resulting from using helm-toolkit functions incorrectly or other rendering issues with gotpl.

  • The K8s directory contains the logs and output of the Kubernetes objects. It includes: pods, nodes, secrets, services, namespaces, configmaps, deployments, daemonsets, and statefulsets. Descriptions for the state of all resources during execution are found here, and this information can prove valuable when debugging issues raised during a check. When a single node or multi-node check fails, this is the first place to look. The logs found here are helpful when the templates render correctly, but the services are not functioning correctly, whether due to service configuration issues or issues with the pods themselves.

  • The nodes directory contains information about the node the gate tests are running on in openstack-infra. This includes: the network interfaces, the contents of iptables, the host’s resolv.conf, and the kernel IP routing table. These logs can be helpful when trying to identify issues with host networking or other issues at the node level.

Adding Services

As charts for additional services are added to OpenStack-Helm, they should be included in the gates. Adding new services to the gates allows a chart developer and the review team to identify any potential issues associated with a new service. All services are currently launched in the gate via a series of launch scripts of the format NNN-service-name.sh where NNN dictates the order these scripts are launched. The script should contain an installation command like:

helm install --namespace=openstack ${WORK_DIR}/mistral --name=mistral

Some services in the gate require specific overrides to the default values in the chart’s values.yaml file. If a service requires multiple overrides to function in the gate, the service should include a separate values.yaml file placed in the tools/overrides/mvp directory. The <service>.yaml MVP files provide a configuration file to use for overriding default configuration values in the chart’s values.yaml as an alternative to overriding individual values during installation. A chart that requires a MVP overrides file requires the following format:

helm install --namespace=openstack ${WORK_DIR}/cinder --name=cinder \
--values=${WORK_DIR}/tools/overrides/mvp/cinder.yaml

Adding Tests

As new charts are developed and the services are added to the gate, an associated Helm test should be introduced to the gates. The appropriate place for executing these tests is in the respective service’s launch script, and must be placed after the entry for installing the service and any associated overrides. Any tests that use the Rally testing framework should leverage the helm_test_deployment function in the aforementioned funcs/helm.sh file. For example, a Helm test for Mistral might look like:

helm_test_deployment mistral 600

This results in the gate running the following:

helm test --timeout 600 mistral
mkdir -p logs/rally
kubectl logs -n openstack mistral-rally-test > logs/rally/mistral
kubectl delete -n openstack pod mistral-rally-test

Any tests that do not use the Rally testing framework would need to be handled in the appropriate manner in launch script. This would ideally result in new functions that could be reused, or expansion of the gate scripts to include scenarios beyond basic service launches.