Add option block to ensure apache2 is enabled correctly

The apache2 monitoring process requires a couple interactions to deploy
successfully. This change will ensure that if the apache2 monitoring
fails, in any way, it does not block the deployment.

Change-Id: Ibe35197a1c65f4abe9e4870c07ee15f37f9a58ab
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

elk_metrics_6x/roles/elastic_filebeat/templates/filebeat.yml.j2

@@ -249,7 +249,7 @@ filebeat.modules:
 #------------------------------- Osquery Module ------------------------------
 - module: osquery
   result:
-  enabled: {{ osquery_enabled | bool }}
+    enabled: {{ osquery_enabled | bool }}
 
     # Set custom paths for the log files. If left empty,
     # Filebeat will choose the paths depending on your OS.
@@ -258,8 +258,7 @@ filebeat.modules:
     # If true, all fields created by this module are prefixed with
     # `osquery.result`. Set to false to copy the fields in the root
     # of the document. The default is true.
-    # NOTE(cloudull): This option is commented out because it is broken
-    #var.use_namespace: true
+    var.use_namespace: true
 
 #----------------------------- PostgreSQL Module -----------------------------
 #- module: postgresql

elk_metrics_6x/roles/elastic_logstash/defaults/main.yml

@@ -17,7 +17,7 @@ temp_dir: /var/lib/logstash/tmp
 logstash_pipelines: "{{lookup('template', 'logstash-pipelines.yml.j2') }}"
 
 # Set processor cores fact
-q_storage: "{{ (ansible_processor_count | int) * (ansible_processor_threads_per_core | int) * 2 }}"
+q_storage: 1
 
 # Set logstash facts
 logstash_queue_size: "{{ ((((q_storage | int) >= 2) | ternary(q_storage, 2) | int) * 1024) // ((logstash_pipelines | from_yaml) | length) }}"

elk_metrics_6x/roles/elastic_metricbeat/tasks/main.yml

@@ -157,33 +157,45 @@
     uwsgi_sockets: "{{ uwsgi_find_sockets }}"
 
 # Apache 2 stats enablement
-- name: Drop apache2 stats site config
-  template:
-    src: apache-status.conf.j2
-    dest: /etc/apache2/sites-available/apache-status.conf
-  when: apache_enabled
+- name: Enable apache2
+  block:
+    - name: Drop apache2 stats site config
+      template:
+        src: apache-status.conf.j2
+        dest: /etc/apache2/sites-available/apache-status.conf
 
-- name: Enable apache2 stats site
-  file:
-    src: /etc/apache2/sites-available/apache-status.conf
-    dest: /etc/apache2/sites-enabled/apache-status.conf
-    state: link
-  when: apache_enabled
+    - name: Enable apache2 stats site
+      file:
+        src: /etc/apache2/sites-available/apache-status.conf
+        dest: /etc/apache2/sites-enabled/apache-status.conf
+        state: link
 
-- name: Ensure apache2 stats mode is enabled
-  apache2_module:
-    name: status
-    state: present
-  register: apache_status_mod
-  when: apache_enabled
+    - name: Ensure apache2 stats mode is enabled
+      apache2_module:
+        name: status
+        state: present
+      register: apache_status_mod
 
-- name: Reload apache2
-  service:
-    name: apache2
-    state: reloaded
+    - name: Reload apache2
+      service:
+        name: apache2
+        state: reloaded
+      when:
+        - apache_status_mod is changed
+  rescue:
+    - name: Apache2 monitoring not enabled
+      debug:
+        msg: >-
+          The apache2 module was not enabled because of an error within the
+          enablement process. Check the host to ensure apache2 is really
+          available and resolve the noted errors before continuing.
+
+    - name: Disable apache2 check
+      set_fact:
+        apache_enabled: false
   when:
-    - apache_enabled
-    - apache_status_mod is changed
+    - apache_enabled | bool
+
 
 # NGINX stats enablement
 - name: Drop nginx stats site config

elk_metrics_6x/vars/variables.yml

@@ -5,6 +5,9 @@ q_mem: "{{ (ansible_memtotal_mb | int) // 3 }}"
 # Option to define half memory
 h_mem: "{{ (ansible_memtotal_mb | int) // 2 }}"
 
+# Option to set persistent queue storage in gigabytes
+q_storage: "{{ (ansible_processor_count | int) * (ansible_processor_threads_per_core | int) * 2 }}"
+
 apm_port: 8200
 elastic_port: 9200
 elastic_hap_port: 9201