openvpn/helm/templates/cm-router.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ include "openvpn.fullname" . }}-routecheck
data:
  route-check: | 
    set -x
    while true
    do
      date
      /sbin/ip link list {{ .Values.dev_name }} > /dev/null 2>&1
      if [ $? -ne 0 ]; then
        __server_pod_ip=$(kubectl get po -o json | jq -r '.items[] | select(.metadata.labels.component=="application" and .metadata.labels["app.kubernetes.io/instance"]=="{{ .Release.Name }}" and .metadata.labels["app.kubernetes.io/name"]=="{{ include "openvpn.name" . }}" and .metadata.deletionTimestamp==null and .status.phase=="Running").status.podIP')
        __route_ip=$(ip route get {{ .Values.net }} | awk '{print $3}') 
        if [[ $__server_pod_ip != $__route_ip ]]; then
          ip route delete {{ .Values.net }}/$(mask2cdr {{ .Values.mask }}) > /dev/null 2>&1
          ip route add {{ .Values.net }}/$(mask2cdr {{ .Values.mask }}) via $__server_pod_ip
        fi
      elif [ $(ip route show to match {{ .Values.net }} | wc -l) -gt 2 ]; then
        ip route delete {{ .Values.net }}/$(mask2cdr {{ .Values.mask }}) > /dev/null 2>&1
      elif [ $(ip route show to match {{ .Values.net }} | wc -l) -le 2 ]; then
        ip route add {{ .Values.net }}/$(mask2cdr {{ .Values.mask }}) dev {{ .Values.dev_name }}
      fi
      sleep 60
    done
  route-delete: |
    ip route delete {{ .Values.net }}/$(mask2cdr {{ .Values.mask }}) > /dev/null 2>&1