health-check

Multi-NIC CNI Health Check

Default namespace is multi-nic-cni-operator. If the namespace is not created, please run

kubectl create ns multi-nic-cni-operator

Deployment Steps

1. Set security policy to allow TCP communication on port 11001 on Host Primary Network

2. Clone this repository and move to health-check directory

   git clone https://github.com/foundation-model-stack/multi-nic-cni.git
   cd multi-nic-cni/health-check
   chmod +x ./checker/script.sh

3. Add openshift.io/cluster-monitoring label to multi-nic-cni-operator namespace

   kubectl label ns multi-nic-cni-operator openshift.io/cluster-monitoring=true

4. Run

   4.1. (optional) specify node (agent) selector

   • Modify agentSelector in ./checker/configmap.yaml

   4.2. run deploy script

   • Cluster with only single multinicnetwork

     make deploy

   • Cluster with multiple multinicnetworks

     # deploy health-check agents (used for all multinicnetwork)
     make deploy-agent
     
     # deploy checker (one deployment per multinicnetwork)
     export NETWORK_NAME=<target multinicnetwork name>
     ./checker/script.sh deploy ${NETWORK_NAME}

   # expected output
   serviceaccount/multi-nic-cni-health-check-agent-sa created
   clusterrole.rbac.authorization.k8s.io/privileged-cr created
   clusterrolebinding.rbac.authorization.k8s.io/multi-nic-cni-privileged-cr-binding created
   daemonset.apps/multi-nic-cni-health-agent created
   serviceaccount/multi-nic-cni-health-checker-sa created
   clusterrole.rbac.authorization.k8s.io/multi-nic-cni-health-check created
   clusterrolebinding.rbac.authorization.k8s.io/multi-nic-cni-health-check-cr-binding created
   service/multi-nic-cni-health-check created
   servicemonitor.monitoring.coreos.com/multi-nic-cni-health-check created
   role.rbac.authorization.k8s.io/multi-nic-cni-health-check-prometheus created
   rolebinding.rbac.authorization.k8s.io/multi-nic-cni-health-check-prometheus created
   clusterrolebinding.rbac.authorization.k8s.io/insecure-prometheus-k8s created
   Set network name multi-nic-network
   deployment.apps/multi-nic-cni-health-checker created

5. Check whether the health-checker and health-check-agent are running.

   kubectl get po -n multi-nic-cni-operator

   NAME                                                         READY   STATUS    RESTARTS   AGE
   multi-nic-cni-health-agent-xx                                1/1     Running   0          
   multi-nic-cni-health-agent-yy                                1/1     Running   0          
   multi-nic-cni-health-checker-zz                              1/1     Running   0          

6. Test status service with port forward

   # forward port on one terminal
   checker=$(kubectl get po -n multi-nic-cni-operator|grep multi-nic-cni-health-checker|awk '{ print $1 }')
   kubectl port-forward ${checker} -n multi-nic-cni-operator 8080:8080
   
   # request the status check on another terminal. This request will activate the health check signal at the request time.
   curl localhost:8080/status

   Example response:

   {"HealthyHosts":["hostA", "hostB", "hostC"],"FailedInfo":[{"HostName":"hostD","Connectivity":{"192.168.0.0/18":false,"192.168.64.0/18":false},"Allocability":0,"StatusCode":...,"Status":...,"Message":...}],"CheckTime":"...","Checker":"checkerX"}

   • To get status of specific host:

     # Example of healthy host
     > curl "localhost:8080/status?host=hostA"
     > {"Info":{"HostName":"hostA","Connectivity":{"192.168.0.0/18":true,"192.168.64.0/18":true},"Allocability":2,"StatusCode":200,"Status":"Success","Message":""},"CheckTime":"...","Checker":"checkerX"}
     
     # Example of unhealthy host
     > curl "localhost:8080/status?host=hostD"
     > {"Info":{"HostName":"hostD","Connectivity":{"192.168.0.0/18":false,"192.168.64.0/18":false},"Allocability":0,"StatusCode":...,"Status":...,"Message":...},"CheckTime":"...","Checker":"checkerX"}

7. Reload prometheus configuration

   For OpenShift cluster with prometheus operator deployed in openshift-monitoring,

   # forward port on one terminal
   kubectl port-forward prometheus-k8s-0 -n openshift-monitoring 9090:9090
   
   # request reload on another terminal
   curl -X POST localhost:9090/-/reload

   Remark: the manifest is prepared for OpenShift cluster where prometheus is deployed via operator in openshift-monitoring namespace. For exporting to prometheus on other namespace, please modify ./health-check/rbac.yaml

   Then, you can check two exported metrics via prometheus query on localhost:9090.

   multi_nic_cni_connectivity: export one if the secondary network interface can be connected to the checker pod via specific network address. otherwise, export zero.

   # total healthy connection observed on each host by specific checker
   sum(multi_nic_cni_connectivity) by (host, checker)
   # list failed connectivity
   multi_nic_cni_connectivity != 1

   multi_nic_cni_allocability: export the number of secondary network interfaces that are successfully created and deleted by the CNI.

   # healthy allocability observed on each host among all checker
   avg(multi_nic_cni_allocability) by (host)
   # list failed allocability
   avg(multi_nic_cni_allocability) by (host) != no. of secondary interfaces