Initializing replicaset with default configuration (single node) fails.

[guptaarvindk]

Initializing replicaset with default configuration (single node) fails. MongoDB server version: 3.6.0

rs.initiate()
{
"info2" : "no configuration specified. Using a default configuration for the set",
"me" : ":27017",
"ok" : 0,
"errmsg" : "FailedToParse: Empty host component parsing HostAndPort from ":27017" for member:{ _id: 0, host: ":27017" }",
"code" : 93,
"codeName" : "InvalidReplicaSetConfig"
}

[tianon]

I can't reproduce (taking into account #180 / #222 by adding --bind_ip_all, since we're talking about 3.6):

$ docker pull mongo:3.6
3.6: Pulling from library/mongo
Digest: sha256:785f81e5cf14e8c2f6989bdf276cb025b076a8403f96f6ed45c8ec8161913fdd
Status: Image is up to date for mongo:3.6

$ docker run -dit --name mongo --hostname mongo mongo:3.6 --bind_ip_all --replSet some-repl
5469769e0ae207d70f6e5b09642dcac23acee7707aaa5c7aaafc2d3e32b702fc

$ docker logs --tail=2 mongo
2017-12-15T04:20:49.167+0000 I REPL     [initandlisten] Did not find local replica set configuration document at startup;  NoMatchingDocument: Did not find replica set configuration document in local.system.replset
2017-12-15T04:20:49.167+0000 I NETWORK  [initandlisten] waiting for connections on port 27017

$ docker exec -it mongo mongo admin
MongoDB shell version v3.6.0
connecting to: mongodb://127.0.0.1:27017/admin
MongoDB server version: 3.6.0
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
	http://docs.mongodb.org/
Questions? Try the support group
	http://groups.google.com/group/mongodb-user
Server has startup warnings: 
2017-12-15T04:20:49.069+0000 I STORAGE  [initandlisten] 
2017-12-15T04:20:49.069+0000 I STORAGE  [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2017-12-15T04:20:49.069+0000 I STORAGE  [initandlisten] **          See http://dochub.mongodb.org/core/prodnotes-filesystem
2017-12-15T04:20:49.109+0000 I CONTROL  [initandlisten] 
2017-12-15T04:20:49.109+0000 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2017-12-15T04:20:49.109+0000 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2017-12-15T04:20:49.109+0000 I CONTROL  [initandlisten] 
2017-12-15T04:21:14.144+0000 E -        [main] Error loading history file: FileOpenFailed: Unable to fopen() file /root/.dbshell: No such file or directory
> rs.initiate()
{
	"info2" : "no configuration specified. Using a default configuration for the set",
	"me" : "mongo:27017",
	"ok" : 1,
	"operationTime" : Timestamp(1513311677, 1),
	"$clusterTime" : {
		"clusterTime" : Timestamp(1513311677, 1),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	}
}
some-repl:SECONDARY> rs.status()
{
	"set" : "some-repl",
	"date" : ISODate("2017-12-15T04:21:58.368Z"),
	"myState" : 1,
	"term" : NumberLong(1),
	"heartbeatIntervalMillis" : NumberLong(2000),
	"optimes" : {
		"lastCommittedOpTime" : {
			"ts" : Timestamp(1513311709, 1),
			"t" : NumberLong(1)
		},
		"readConcernMajorityOpTime" : {
			"ts" : Timestamp(1513311709, 1),
			"t" : NumberLong(1)
		},
		"appliedOpTime" : {
			"ts" : Timestamp(1513311709, 1),
			"t" : NumberLong(1)
		},
		"durableOpTime" : {
			"ts" : Timestamp(1513311709, 1),
			"t" : NumberLong(1)
		}
	},
	"members" : [
		{
			"_id" : 0,
			"name" : "mongo:27017",
			"health" : 1,
			"state" : 1,
			"stateStr" : "PRIMARY",
			"uptime" : 69,
			"optime" : {
				"ts" : Timestamp(1513311709, 1),
				"t" : NumberLong(1)
			},
			"optimeDate" : ISODate("2017-12-15T04:21:49Z"),
			"infoMessage" : "could not find member to sync from",
			"electionTime" : Timestamp(1513311677, 2),
			"electionDate" : ISODate("2017-12-15T04:21:17Z"),
			"configVersion" : 1,
			"self" : true
		}
	],
	"ok" : 1,
	"operationTime" : Timestamp(1513311709, 1),
	"$clusterTime" : {
		"clusterTime" : Timestamp(1513311709, 1),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	}
}

[guptaarvindk]

In my case mongo server name is blank, thats what causing it to fail.

"me" : ":27017",

You think this could be happening because I dont have flag --bind_ip_all,

My setup used to work until my kubernetes pod spec starting picking latest which is 3.6. When I moved back to older version mongo:3.4.10-jessie, its working again fine for me.

Thanks,
-Arvind

[tianon]

I _know_ it's definitely happening because of that missing flag. If you check your logs on "rs.initiate()", you should have a warning of that very fact (which says something to the effect of missing "--bind_ip_all" or "--bind_ip").