Added mongod

pages/common/mongod.md

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+# mongod
+
+> The daemon process for MongoDB.
+
+- Specify runtime configurations:
+
+`mongod --config <filename>`
+
+- Specify port for MongoDB to listen to client connections:
+
+`mongod --port <port>`
+
+- Change database profiling level. 0 is off, 1 is only slow operations, 2 is all:
+
+`mongod --profile <level>`