Add upgrade task options

To ensure users can upgrade packages the variable
`"{{ elk_package_state | default('present') }}"` has been added
to all package installs.

Change-Id: I0238d9e1ed991cb1480bd924f2d5a09687890da3
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

elk_metrics_6x/common_task_install_elk_repo.yml

@@ -16,7 +16,7 @@
 - name: add Elastic search public GPG key (same for Metricsbeat)
   apt_key:
     url: "https://artifacts.elastic.co/GPG-KEY-elasticsearch"
-    state: "{{ elk_package_state | default('present') }}"
+    state: "{{ ((elk_package_state | default('present')) == 'absent') | ternary('absent', 'present') }}"
 
 - name: enable apt-transport-https
   apt:

elk_metrics_6x/installElastic.yml

@@ -68,7 +68,7 @@
     - name: Ensure Java is installed
       apt:
         name: openjdk-8-jre
-        state: present
+        state: "{{ elk_package_state | default('present') }}"
         install_recommends: yes
         update_cache: yes
 
@@ -77,7 +77,7 @@
     - name: Ensure Elastic search is installed
       apt:
         name: elasticsearch
-        state: present
+        state: "{{ elk_package_state | default('present') }}"
         update_cache: yes
 
     - name: Drop elasticsearch conf file

elk_metrics_6x/installKibana.yml

@@ -13,7 +13,7 @@
     - name: Ensure Nginx is installed
       apt:
         name: "{{ item }}"
-        state: present
+        state: "{{ elk_package_state | default('present') }}"
         update_cache: yes
       with_items:
         - nginx
@@ -42,7 +42,7 @@
     - name: Ensure kibana  is installed
       apt:
         name: kibana
-        state: present
+        state: "{{ elk_package_state | default('present') }}"
         update_cache: yes
 
     - name: Drop kibana conf file

elk_metrics_6x/installLogstash.yml

@@ -56,14 +56,14 @@
     - name: Ensure Java is installed
       apt:
         name: openjdk-8-jre
-        state: present
+        state: "{{ elk_package_state | default('present') }}"
         install_recommends: yes
         update_cache: yes
 
     - name: Ensure Logstash is installed
       apt:
         name: logstash
-        state: present
+        state: "{{ elk_package_state | default('present') }}"
         update_cache: yes
 
     - name: Drop Logstash conf for beats input

elk_metrics_6x/readme.rst

@@ -390,6 +390,18 @@ Example command using the embedded Ansible from within the grafana directory.
                                   -e 'galera_address={{ internal_lb_vip_address }}'
 
 
+Upgrading the cluster
+---------------------
+
+To upgrade the packages throughout the elastic search cluster set the package
+state variable, `elk_package_state`, to latest.
+
+.. code-block:: bash
+
+    cd /opt/openstack-ansible-ops/elk_metrics_6x
+    ansible-playbook site.yml $USER_VARS -e 'elk_package_state="latest"'
+
+
 Trouble shooting
 ----------------
 

elk_metrics_6x/vars/variables.yml

@@ -1,7 +1,7 @@
 # elk apt repo
 elk_repo:
   repo: 'deb https://artifacts.elastic.co/packages/6.x/apt stable main'
-  state: "{{ elk_package_state | default('present') }}"
+  state: "{{ ((elk_package_state | default('present')) == 'absent') | ternary('absent', 'present') }}"
 
 #metricbeats monitoring endpoints
 elastic_metricbeat_rabbitmq_monitoring_hosts: '"localhost:15672"'