Add mongo-replica/README.md

mongo-replica/README.md

@@ -0,0 +1,18 @@
+```sh
+mongosh
+
+rs.initiate()
+rs.add("IP:PORT")
+
+rs.status()
+rs.printSecondaryReplicationInfo()
+
+# primary로 전환
+rs.stepDown()
+rs.status()
+```
+
+## URI
+```
+mongodb://새서버IP:포트,기존서버IP:포트/?replicaSet=레플리카셋이름
+```