carbon-cronjob.yaml

# This cronjob queries an existing Prometheus for `entsoe_generation_co2`
# and makes decission how many resourcequotas are allowed for the workload in the running namespace.
---
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    app: carbon-cronjob
  name: carbon-cronjob
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    app: carbon-cronjob
  name: carbon-cronjob
rules:
- apiGroups:
  - ""
  resources:
  - resourcequotas
  verbs:
  - create
  - get
  - list
  - watch
  - patch
  - update
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    app: carbon-cronjob
  name: carbon-cronjob
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: carbon-cronjob
subjects:
  - kind: ServiceAccount
    name: carbon-cronjob
---
apiVersion: v1
data:
  run.sh: |
    #!/bin/bash
    # set 3 carbon emission limits to operate resource quotas
    highlimit=80
    middlelimit=50
    smalllimit=40
    quota=10
    # get the current carbon emission from entsoe
    carbon=$(curl -s http://project-monitoring-prometheus.cattle-monitoring-system:9090/api/v1/query?query=entsoe_generation_co2 | jq -r '.data.result[]|select(.metric.job=="caas-carbon-footprint")|.value[-1]')
    if  [ "${#carbon}" -lt 1 ]; then
      echo "no carbon emission data at this time"
      exit
    fi
    # unit is g/s, multiplicate and round because bash can't handle floating numbers
    carbon=$(printf "%.0f\n" $( bc -l <<<"10000*$carbon" ))
    echo "carbon factor is  "$carbon" , operate the quota now"
    # set the cpu resource limit based on the current carbon emission factor
    if [[ $carbon -gt $highlimit ]]; then
      quota=10
    elif [[ $carbon -gt $middlelimit ]] && [[ $carbon -lt $highlimit ]]; then
      quota=1
    elif [[ $carbon -lt $middlelimit ]] && [[ $carbon -gt $smalllimit ]]; then
      quota=500m
    elif [[ $carbon -lt $smalllimit ]] && [[ $carbon -gt 0 ]]; then
      quota=100m
    fi
    cat <<EOF | kubectl apply -f -
    apiVersion: v1
    kind: ResourceQuota
    metadata:
      labels:
        resourcequota.management.cattle.io/default-resource-quota: "true"
      name: co2-quota
    spec:
      hard:
        limits.cpu: $quota
    EOF

kind: ConfigMap
metadata:
  labels:
    app: carbon-cronjob
  name: carbon-cronjob
---
apiVersion: batch/v1
kind: CronJob
metadata:
  labels:
    job-name: carbon-cronjob
  name: carbon-cronjob
spec:
  concurrencyPolicy: Forbid
  failedJobsHistoryLimit: 1
  successfulJobsHistoryLimit: 1
  suspend: false
  schedule: "*/1 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          restartPolicy: Never
          containers:
          - image: mtr.devops.telekom.de/caas/k8s-tools:latest
            imagePullPolicy: Always
            name: carbon-cronjob
            command: ["sh","-c"]
            args: ["/sidecar/run.sh"]
            resources:
              limits:
                cpu: 400m
                memory: 512Mi
              requests:
                cpu: 100m
                memory: 128Mi
            securityContext:
              allowPrivilegeEscalation: false
              capabilities:
                drop:
                - ALL
              privileged: false
              readOnlyRootFilesystem: true
              runAsUser: 1000
              runAsGroup: 1000
            volumeMounts:
            - name: carbon-cronjob
              mountPath: /sidecar
          securityContext:
            fsGroup: 1000
            supplementalGroups:
            - 1000
          serviceAccountName: carbon-cronjob
          volumes:
          - name: carbon-cronjob
            configMap:
              defaultMode: 0755
              name: carbon-cronjob