Use Docker healthchecks for elasticsearch services

This change enables the use of Docker healthchecks for elasticsearch services.
Implements: blueprint container-health-check

Change-Id: Ib50d56cc206a80b20a4f96e95bcdd8d11269234f

ansible/roles/elasticsearch/defaults/main.yml

@@ -11,6 +11,7 @@ elasticsearch_services:
       ES_JAVA_OPTS: "{{ es_java_opts }}"
     volumes: "{{ elasticsearch_default_volumes + elasticsearch_extra_volumes }}"
     dimensions: "{{ elasticsearch_dimensions }}"
+    healthcheck: "{{ elasticsearch_healthcheck }}"
     haproxy:
       elasticsearch:
         enabled: "{{ enable_elasticsearch }}"
@@ -85,6 +86,19 @@ elasticsearch_curator_image_full: "{{ elasticsearch_curator_image }}:{{ elastics
 elasticsearch_dimensions: "{{ default_container_dimensions }}"
 elasticsearch_curator_dimensions: "{{ default_container_dimensions }}"
 
+elasticsearch_enable_healthchecks: "{{ enable_container_healthchecks }}"
+elasticsearch_healthcheck_interval: "{{ default_container_healthcheck_interval }}"
+elasticsearch_healthcheck_retries: "{{ default_container_healthcheck_retries }}"
+elasticsearch_healthcheck_start_period: "{{ default_container_healthcheck_start_period }}"
+elasticsearch_healthcheck_test: ["CMD-SHELL", "healthcheck_curl http://{{ api_interface_address |  put_address_in_context('url') }}:{{ elasticsearch_port }}"]
+elasticsearch_healthcheck_timeout: "{{ default_container_healthcheck_timeout }}"
+elasticsearch_healthcheck:
+  interval: "{{ elasticsearch_healthcheck_interval }}"
+  retries: "{{ elasticsearch_healthcheck_retries }}"
+  start_period: "{{ elasticsearch_healthcheck_start_period }}"
+  test: "{% if elasticsearch_enable_healthchecks | bool %}{{ elasticsearch_healthcheck_test }}{% else %}NONE{% endif %}"
+  timeout: "{{ elasticsearch_healthcheck_timeout }}"
+
 elasticsearch_default_volumes:
   - "{{ node_config_directory }}/elasticsearch/:{{ container_config_directory }}/"
   - "/etc/localtime:/etc/localtime:ro"

ansible/roles/elasticsearch/handlers/main.yml

@@ -12,6 +12,7 @@
     environment: "{{ service.environment }}"
     volumes: "{{ service.volumes }}"
     dimensions: "{{ service.dimensions }}"
+    healthcheck: "{{ service.healthcheck | default(omit) }}"
   when:
     - kolla_action != "config"
 

ansible/roles/elasticsearch/tasks/check-containers.yml

@@ -8,6 +8,7 @@
     image: "{{ item.value.image }}"
     volumes: "{{ item.value.volumes }}"
     dimensions: "{{ item.value.dimensions }}"
+    healthcheck: "{{ item.value.healthcheck | default(omit) }}"
     environment: "{{ item.value.environment|default(omit) }}"
   when:
     - inventory_hostname in groups[item.value.group]

releasenotes/notes/implement-docker-healthchecks-for-elasticsearch-b251cd701d428a18.yaml

+---
+features:
+  - |
+    Implements container healthchecks for elasticsearch services.
+    See `blueprint
+    <https://blueprints.launchpad.net/kolla-ansible/+spec/container-health-check>`__