Adding EFK logging stack

roles/kubernetes-apps/efk/fluentd/defaults/main.yml

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+---
+fluentd_cpu_limit: 0m 
+fluentd_mem_limit: 200Mi
+fluentd_cpu_requests: 100m
+fluentd_mem_requests: 200Mi

roles/kubernetes-apps/efk/fluentd/meta/main.yml

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+dependencies:
+  - role: download
+    file: "{{ downloads.fluentd }}"

roles/kubernetes-apps/efk/fluentd/tasks/main.yml

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+---
+- name: "Fluentd | Write fluentd daemonset"
+  template: 
+    src: fluentd-ds.yml.j2
+    dest: "{{ kube_config_dir }}/fluentd-ds.yaml"
+  register: fluentd_ds_manifest
+
+- name: "Fluentd | Create fluentd daemonset"
+  kube:
+    filename: "{{kube_config_dir}}/fluentd-ds.yaml"
+    kubectl: "{{bin_dir}}/kubectl"
+    name: "fluentd-es-v{{ fluentd_version }}"
+    namespace: "{{system_namespace}}"
+    resource: "ds"
+    state: "{{ item | ternary('latest','present') }}"
+  with_items: "{{ fluentd_ds_manifest.changed }}"
+  run_once: true

roles/kubernetes-apps/efk/fluentd/templates/fluentd-ds.yml.j2

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+---
+# https://raw.githubusercontent.com/kubernetes/kubernetes/v1.5.2/cluster/addons/fluentd-elasticsearch/es-controller.yaml
+apiVersion: extensions/v1beta1
+kind: DaemonSet
+metadata:
+  name: "fluentd-es-v{{ fluentd_version }}"
+  namespace: "{{ system_namespace }}"
+  labels:
+    k8s-app: fluentd-es
+    kubernetes.io/cluster-service: "true"
+    version: "v{{ fluentd_version }}"
+spec:
+  template:
+    metadata:
+      labels:
+        k8s-app: fluentd-es
+        kubernetes.io/cluster-service: "true"
+        version: "v{{ fluentd_version }}"
+    spec:
+      containers:
+      - name: fluentd-es
+        image: "{{ fluentd_image_repo }}:{{ fluentd_image_tag }}"
+        command:
+          - '/bin/sh'
+          - '-c'
+          - '/usr/sbin/td-agent 2>&1 >> /var/log/fluentd.log'
+        resources:
+          limits:
+{% if fluentd_cpu_limit is defined and fluentd_cpu_limit != "0m" %}
+            mem: {{ fluentd_cpu_limit }}
+{% endif %}
+            memory: {{ fluentd_mem_limit }}
+          requests:
+            cpu:  {{ fluentd_cpu_requests }}
+            memory: {{ fluentd_mem_requests }}
+        volumeMounts:
+        - name: varlog
+          mountPath: /var/log
+        - name: varlibdockercontainers
+          mountPath: /var/lib/docker/containers
+          readOnly: true
+      terminationGracePeriodSeconds: 30
+      volumes:
+      - name: varlog
+        hostPath:
+          path: /var/log
+      - name: varlibdockercontainers
+        hostPath:
+          path: /var/lib/docker/containers