Replace config-external - memcached

Change-Id: I83094d1fc98c79c74d6c9fdc68aa224ae4a6d672
Partially-Implements: blueprint replace-config-external

ansible/roles/memcached/tasks/config.yml

@@ -5,7 +5,7 @@
     state: "directory"
     recurse: "yes"
 
-- name: Copying over config(s)
+- name: Copying over memcached JSON configuration file
   template:
-    src: "memcached.conf.j2"
-    dest: "{{ node_config_directory }}/memcached/memcached.conf"
+    src: "memcached.json.j2"
+    dest: "{{ node_config_directory }}/memcached/config.json"

ansible/roles/memcached/tasks/start.yml

@@ -13,7 +13,7 @@
     insecure_registry: "{{ docker_insecure_registry }}"
     name: memcached
     image: "{{ memcached_image_full }}"
-    volumes: "{{ node_config_directory }}/memcached/:/opt/kolla/memcached/:ro"
+    volumes: "{{ node_config_directory }}/memcached/:/opt/kolla/config_files/:ro"
     env:
       KOLLA_CONFIG_STRATEGY: "{{ config_strategy }}"
   when: inventory_hostname in groups['memcached']

ansible/roles/memcached/templates/memcached.conf.j2

-OPTIONS="-l {{ hostvars[inventory_hostname]['ansible_' + api_interface]['ipv4']['address'] }} -p {{ memcached_port }}"

ansible/roles/memcached/templates/memcached.json.j2

+{% set memcache_user = 'memcache' if kolla_base_distro in ['ubuntu', 'debian'] else 'memcached' %}
+{
+    "command": "/usr/bin/memcached -u {{ memcache_user }} -vv -l {{ hostvars[inventory_hostname]['ansible_' + api_interface]['ipv4']['address'] }} -p {{ memcached_port }}",
+    "config_files": []
+}

docker/memcached/start.sh

@@ -2,21 +2,11 @@
 
 set -o errexit
 
-if [[ "${KOLLA_BASE_DISTRO}" == "ubuntu" || \
-        "${KOLLA_BASE_DISTRO}" == "debian" ]]; then
-    CMD="/usr/bin/memcached"
-    ARGS="-u memcache -vv"
-else
-    CMD="/usr/bin/memcached"
-    ARGS="-u memcached -vv"
-fi
-
 # Loading common functions.
 source /opt/kolla/kolla-common.sh
 
-# Execute config strategy
-set_configs
-
-source /etc/memcached.conf
+# Generate run command
+python /opt/kolla/set_configs.py
+CMD=$(cat /run_command)
 
-exec $CMD $ARGS $OPTIONS
+exec $CMD