add mongodb role

ansible/roles/mongodb/templates/mongod.conf.j2

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+# mongod.conf
+
+# for documentation of all options, see:
+#   http://docs.mongodb.org/manual/reference/configuration-options/
+
+processManagement:
+  pidFilePath: /var/run/mongodb/mongod.pid
+
+# Where and how to store data.
+storage:
+  dbPath: /var/lib/mongodb
+#  engine:
+#  wiredTiger:
+
+# where to write logging data.
+systemLog:
+  destination: file
+  logAppend: true
+  logRotate: reopen
+  path: /var/log/mongodb/mongod.log
+
+# network interfaces
+net:
+  port: 27017
+  bindIp: 0.0.0.0
+
+
+# how the process runs
+processManagement:
+  timeZoneInfo: /usr/share/zoneinfo
+
+security:
+  keyFile: /etc/mongo-keyfile
+  authorization: enabled
+
+#operationProfiling:
+
+replication:
+  replSetName: {{ mongodb_replicaset_name }}
+
+#sharding:
+
+setParameter:
+    transactionLifetimeLimitSeconds: 3600