MongoDB - Migrazione da ReplicaSet a Singolo Nodo

Alle volte capita di dover demolire una replica e riportare i dati su un singolo nodo del MongoDB.

ecco la procedura testata su MongoDB 3.0.8

	mongoserver:PRIMARY> rs.status();
	{
	"set" : "mongoserver",
	"date" : ISODate("2016-02-02T10:47:07.510Z"),
	"myState" : 1,
	"members" : [
	{
	"_id" : 3,
	"name" : "192.168.1.10:37017",
	"health" : 1,
	"state" : 2,
	"stateStr" : "SECONDARY",
	"uptime" : 1195281,
	"optime" : Timestamp(1454409817, 1),
	"optimeDate" : ISODate("2016-02-02T10:43:37Z"),
	"lastHeartbeat" : ISODate("2016-02-02T10:47:07.230Z"),
	"lastHeartbeatRecv" : ISODate("2016-02-02T10:47:07.194Z"),
	"pingMs" : 0,
	"syncingTo" : "192.168.1.10:27017",
	"configVersion" : 16
	},
	{
	"_id" : 4,
	"name" : "192.168.1.10:47017",
	"health" : 1,
	"state" : 7,
	"stateStr" : "ARBITER",
	"uptime" : 1195281,
	"lastHeartbeat" : ISODate("2016-02-02T10:47:06.225Z"),
	"lastHeartbeatRecv" : ISODate("2016-02-02T10:47:07.238Z"),
	"pingMs" : 0,
	"configVersion" : 16
	},
	{
	"_id" : 5,
	"name" : "192.168.1.10:27017",
	"health" : 1,
	"state" : 1,
	"stateStr" : "PRIMARY",
	"uptime" : 1195286,
	"optime" : Timestamp(1454409817, 1),
	"optimeDate" : ISODate("2016-02-02T10:43:37Z"),
	"electionTime" : Timestamp(1453214750, 1),
	"electionDate" : ISODate("2016-01-19T14:45:50Z"),
	"configVersion" : 16,
	"self" : true
	}
	],
	"ok" : 1
	}
	##Remove Secondary
	mongoserver:PRIMARY> rs.remove("192.168.1.10:37017")
	{ "ok" : 1 }
	mongoserver:PRIMARY> rs.remove("192.168.1.10:47017")
	{ "ok" : 1 }
	mongoserver:PRIMARY> rs.status();
	{
	"set" : "mongoserver",
	"date" : ISODate("2016-02-02T10:48:23.214Z"),
	"myState" : 1,
	"members" : [
	{
	"_id" : 5,
	"name" : "192.168.1.10:27017",
	"health" : 1,
	"state" : 1,
	"stateStr" : "PRIMARY",
	"uptime" : 1195362,
	"optime" : Timestamp(1454410079, 1),
	"optimeDate" : ISODate("2016-02-02T10:47:59Z"),
	"electionTime" : Timestamp(1453214750, 1),
	"electionDate" : ISODate("2016-01-19T14:45:50Z"),
	"configVersion" : 18,
	"self" : true
	}
	],
	"ok" : 1
	}
	stop all mongo service
	/etc/init.d/mongod1 stop
	/etc/init.d/mongod2 stop
	/etc/init.d/mongod3 stop
	comment replicaset info in /etc/mongod1.conf
	#replication:
	# replSetName: mongoserver
	restart single node
	/etc/init.d/mongod_single start
	connect to mongo
	> use local
	switched to db local
	> db.dropDatabase();
	{ "dropped" : "local", "ok" : 1 }
	restart mongo
	/etc/init.d/mongod_single stop
	/etc/init.d/mongod_single start
	##Delete old folder data

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