# This manifest creates a Service, which will be backed by Calico's Typha daemon.
# Typha sits in between Felix and the API server, reducing Calico's load on the API server.

apiVersion: v1
kind: Service
metadata:
  name: calico-typha
  namespace: kube-system
  labels:
    k8s-app: calico-typha
spec:
  ports:
    - port: 5473
      protocol: TCP
      targetPort: calico-typha
      name: calico-typha
  selector:
    k8s-app: calico-typha

---

# This manifest creates a Deployment of Typha to back the above service.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: calico-typha
  namespace: kube-system
  labels:
    k8s-app: calico-typha
spec:
  # Number of Typha replicas.  To enable Typha, set this to a non-zero value *and* set the
  # typha_service_name variable in the calico-config ConfigMap above.
  #
  # We recommend using Typha if you have more than 50 nodes.  Above 100 nodes it is essential
  # (when using the Kubernetes datastore).  Use one replica for every 100-200 nodes.  In
  # production, we recommend running at least 3 replicas to reduce the impact of rolling upgrade.
  replicas: {{ typha_replicas }}
  revisionHistoryLimit: 2
  selector:
    matchLabels:
      k8s-app: calico-typha
  template:
    metadata:
      labels:
        k8s-app: calico-typha
      annotations:
        cluster-autoscaler.kubernetes.io/safe-to-evict: 'true'
    spec:
      nodeSelector:
        kubernetes.io/os: linux
      hostNetwork: true
      tolerations:
        - key: node-role.kubernetes.io/master
          operator: Exists
          effect: NoSchedule
      # Since Calico can't network a pod until Typha is up, we need to run Typha itself
      # as a host-networked pod.
      serviceAccountName: calico-node
      priorityClassName: system-cluster-critical
      containers:
      - image: {{ calico_typha_image_repo }}:{{ calico_typha_image_tag }}
        name: calico-typha
        ports:
        - containerPort: 5473
          name: calico-typha
          protocol: TCP
        env:
          # Enable "info" logging by default.  Can be set to "debug" to increase verbosity.
          - name: TYPHA_LOGSEVERITYSCREEN
            value: "info"
          # Disable logging to file and syslog since those don't make sense in Kubernetes.
          - name: TYPHA_LOGFILEPATH
            value: "none"
          - name: TYPHA_LOGSEVERITYSYS
            value: "none"
          # Monitor the Kubernetes API to find the number of running instances and rebalance
          # connections.
          - name: TYPHA_CONNECTIONREBALANCINGMODE
            value: "kubernetes"
          - name: TYPHA_DATASTORETYPE
            value: "kubernetes"
          - name: TYPHA_HEALTHENABLED
            value: "true"
          - name: TYPHA_MAXCONNECTIONSLOWERLIMIT
            value: "{{ typha_max_connections_lower_limit }}"
{% if typha_secure %}
          - name: TYPHA_CAFILE
            value: /etc/ca/ca.crt
          - name: TYPHA_CLIENTCN
            value: typha-client
          - name: TYPHA_SERVERCERTFILE
            value: /etc/typha/server_certificate.pem
          - name: TYPHA_SERVERKEYFILE
            value: /etc/typha/server_key.pem
        volumeMounts:
          - mountPath: /etc/typha
            name: typha-server
            readOnly: true
          - mountPath: /etc/ca/ca.crt
            subPath: ca.crt
            name: cacert
            readOnly: true
{% endif %}
          # Uncomment these lines to enable prometheus metrics.  Since Typha is host-networked,
          # this opens a port on the host, which may need to be secured.
          #- name: TYPHA_PROMETHEUSMETRICSENABLED
          #  value: "true"
          #- name: TYPHA_PROMETHEUSMETRICSPORT
          #  value: "9093"

          # Needed for version >=3.7 when the 'host-local' ipam is used
          # Should never happen given templates/cni-calico.conflist.j2
          # Configure route aggregation based on pod CIDR.
          # - name: USE_POD_CIDR
          #   value: "true"
        livenessProbe:
{% if calico_version is version('v3.7.0', '<') %}
          exec:
            command:
            - calico-typha
            - check
            - liveness
{% else %}
          httpGet:
            path: /liveness
            port: 9098
            host: localhost
{% endif %}
          periodSeconds: 30
          initialDelaySeconds: 30
        readinessProbe:
{% if calico_version is version('v3.7.0', '<') %}
          exec:
            command:
            - calico-typha
            - check
            - readiness
{% else %}
          httpGet:
            path: /readiness
            port: 9098
            host: localhost
{% endif %}
          periodSeconds: 10
{% if typha_secure %}
      volumes:
        - name: typha-server
          secret:
            secretName: typha-server
            items:
              - key: tls.crt
                path: server_certificate.pem
              - key: tls.key
                path: server_key.pem
        - name: cacert
          hostPath:
            path: "{{ kube_cert_dir }}"
{% endif %}

---

# This manifest creates a Pod Disruption Budget for Typha to allow K8s Cluster Autoscaler to evict

apiVersion: policy/v1beta1
kind: PodDisruptionBudget
metadata:
  name: calico-typha
  namespace: kube-system
  labels:
    k8s-app: calico-typha
spec:
  maxUnavailable: 1
  selector:
    matchLabels:
      k8s-app: calico-typha