Improve Galera running, stop, bootstrap behavior

Adds a check to see if Galera is running.
Improves check of cluster size to only test when Galera is running.
Improves Stop operation to consume new check.
Improves Bootstrap operation to consume new check.

Co-Authored-By: Kevin Carter <kevin.carter@rackspace.com>
Change-Id: I44f5ff5a7240f3583628fca4d039234f9e34ddf7
Closes-Bug: 1438368

playbooks/roles/galera_server/tasks/galera_add_node.yml

@@ -13,6 +13,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+- name: Check if mysql is running
+  shell: "pgrep -fl mysqld"
+  register: mysql_running
+  changed_when: mysql_running.rc != 0
+  tags:
+    - galera-bootstrap
+
 - name: Get incoming addresses from cluster
   shell: |
     mysql -e 'show status like "wsrep_incoming_addresses"\G'|awk '/Value/{print $2}'
@@ -26,7 +33,9 @@
   service:
     name: mysql
     state: restarted
-  when: "not wsrep_incoming_addresses.stdout|search('{{ ansible_ssh_host }}')"
+  when: >
+    "not wsrep_incoming_addresses.stdout|search('{{ ansible_ssh_host }}')" or
+    mysql_running != 0
   tags:
     - galera-add-node
     - galera-bootstrap

playbooks/roles/galera_server/tasks/galera_bootstrap.yml

@@ -13,11 +13,19 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+- name: Check if mysql is running
+  shell: "pgrep -fl mysqld"
+  register: mysql_running
+  changed_when: mysql_running.rc != 0
+  tags:
+    - galera-bootstrap
+
 - name: Check wsrep cluster size
   shell: |
     mysql -e 'show status like "wsrep_cluster_size%"\G'|awk '/Value/{print $2}'
   register: wsrep_cluster_size
   changed_when: wsrep_cluster_size.stdout|search("1")
+  when: mysql_running.rc == 0
   tags:
     - galera-bootstrap
 
@@ -27,7 +35,9 @@
     state: stopped
     pattern: mysqld
   register: mysqlstopped
-  when: wsrep_cluster_size.stdout | search("1") or wsrep_cluster_size.stderr | search("ERROR")
+  when: >
+    mysql_running.rc == 0 and
+    (wsrep_cluster_size.stdout | search("1") or wsrep_cluster_size.stderr | search("ERROR"))
   tags:
     - galera-bootstrap
 
@@ -43,6 +53,6 @@
     name: mysql
     state: restarted
     args: --wsrep-new-cluster
-  when: wsrep_cluster_size.stdout|search("1") or mysqlstopped|changed or not mysql_running.stdout|search("mysql")
+  when: wsrep_cluster_size.stdout|search("1") or mysqlstopped|changed or mysql_running != 0
   tags:
     - galera-bootstrap