Adding keepalived functionality to kolla-kubernetes

This PS adds keepalived pod to kubernetes cluster, keepalived
runs as a daemonset on all compute nodes but it can be controlled by
assigning keepalived label to the kubernetes compute node.

TrivialFix

Change-Id: I01f1f2e6db166ad6b7dadedc62feb22ad9fbf902

etc/kolla-kubernetes/kolla-kubernetes.yml

@@ -260,3 +260,4 @@ log_disable:
 - iscsi-iscsid
 - iscsi-tgtd
 - elasticsearch
+- keepalived

etc/kolla-kubernetes/service_resources.yml

@@ -880,3 +880,24 @@ kolla-kubernetes:
           port_name: kibana
           image: kibana_image_full
           check_path: /
+  - name: keepalived
+    pods:
+    - name: keepalived
+      containers:
+      - name: keepalived
+    - name: keepalived
+      containers:
+      - name: keepalived
+    resources:
+      configmap:
+      - name: keepalived
+        template: services/keepalived/keepalived-configmap.yml.j2
+      secret:
+      disk:
+      pv:
+      pvc:
+      svc:
+      bootstrap:
+      pod:
+      - name: keepalived
+        template: services/keepalived/keepalived-daemonset.yml.j2

services/keepalived/keepalived-configmap.yml.j2

@@ -0,0 +1,34 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ kolla_kubernetes.cli.args.resource_name }}
+  namespace: {{ kolla_kubernetes_namespace }}
+data:
+  keepalived.conf: |
+    vrrp_instance kolla_internal_vip_{{ keepalived_virtual_router_id|default(51) }} {
+        state MASTER
+        nopreempt
+        interface {{ api_interface }}
+        virtual_router_id {{ keepalived_virtual_router_id|default(51) }}
+        priority 1
+        advert_int 1
+        virtual_ipaddress {
+            {{ kolla_kubernetes_external_vip }} dev {{ api_interface }}
+        }
+        authentication {
+            auth_type PASS
+            auth_pass {{ keepalived_password }}
+        }
+    }
+  config.json: |
+    {
+        "command": "/usr/sbin/keepalived -nld -p /run/keepalived.pid",
+        "config_files": [
+            {
+                "source": "/var/lib/kolla/config_files/keepalived.conf",
+                "dest": "/etc/keepalived/keepalived.conf",
+                "owner": "root",
+                "perm": "0644"
+            }
+        ]
+    }

services/keepalived/keepalived-daemonset.yml.j2

@@ -0,0 +1,75 @@
+{%- set resourceName = kolla_kubernetes.cli.args.resource_name %}
+{%- set netHostTrue = "yes" %}
+{%- import "services/common/common-lib.yml.j2" as lib with context %}
+apiVersion: extensions/v1beta1
+kind: DaemonSet
+metadata:
+  name: keepalived
+  labels:
+    component: keepalived
+    system: keepalived
+  namespace: {{ kolla_kubernetes_namespace }}
+spec:
+  template:
+    metadata:
+      labels:
+        component: keepalived
+        system: keepalived
+      annotations:
+        pod.alpha.kubernetes.io/init-containers: '[
+          {
+             "name": "initialize-keepalived-config",
+             "image": "{{ keepalived_image_full }}",
+             "command": [
+                 "sh",
+                 "-c",
+                 "cp -a /srv/configmap/..data/* /srv/pod-main-config/;
+                 " ],
+             "volumeMounts": [
+                {
+                    "name": "keepalived-configmap",
+                      "mountPath": "/srv/configmap"
+                },
+                {
+                    "name": "pod-main-config",
+                    "mountPath": "/srv/pod-main-config"
+                }
+             ]
+          }
+        ]'
+    spec:
+      hostNetwork: True
+      nodeSelector:
+{%- set selector = kolla_kubernetes_hostlabel_keepalived |
+                   default(kolla_kubernetes_hostlabel_controller) %}
+          {{ selector.key }}: {{ selector.value }}
+      containers:
+        - image: "{{ keepalived_image_full }}"
+          name: main
+          securityContext:
+            privileged: true
+          env:
+            - name: KOLLA_CONFIG_STRATEGY
+              value: {{ config_strategy }}
+          volumeMounts:
+{{ lib.common_volume_mounts(indent=12) }}
+            - mountPath: {{ container_config_directory }}
+              name: pod-main-config
+              readOnly: true
+            - mountPath: /lib/modules
+              name: host-lib-modules
+            - mountPath: /run
+              name: host-run
+      volumes:
+{{ lib.common_volumes(indent=8) }}
+        - name: pod-main-config
+          emptyDir: {}
+        - name: keepalived-configmap
+          configMap:
+            name: keepalived
+        - name: host-lib-modules
+          hostPath:
+            path: /lib/modules
+        - name: host-run
+          hostPath:
+            path: /run