Can't setup 3 nodes MongoDB recplica set
- by Victor Lin
I just follow instructions in MongoDB document
Replica Sets - Basics
to setup a 3-node Replica set. Everything goes fine when I do the initiate and add first node in the primary.
[foo@host-a mongodb]$ bin/mongo localhost
MongoDB shell version: 1.8.2
connecting to: localhost
> rs.initiate()
{
"info2" : "no configuration explicitly specified -- making one",
"info" : "Config now saved locally. Should come online in about a minute.",
"ok" : 1
}
> rs.add("host-b")
{ "ok" : 1 }
So far so good, but when I try to add third node
myset:PRIMARY> rs.addArb("host-c")
Sun Aug 7 22:57:09 MessagingPort recv() errno:104 Connection reset by peer 127.0.0.1:27017
Sun Aug 7 22:57:09 SocketException: remote: error: 9001 socket exception [1]
Sun Aug 7 22:57:09 DBClientCursor::init call() failed
Sun Aug 7 22:57:09 query failed : local.$cmd { count: "system.replset", query: {}, fields: {} } to: 127.0.0.1
Sun Aug 7 22:57:09 Error: error doing query: failed shell/collection.js:150
Sun Aug 7 22:57:09 trying reconnect to 127.0.0.1
Sun Aug 7 22:57:09 reconnect 127.0.0.1 ok
As result, the current primary became secondary, and the host-b was marked as dead, but actually, it is still alive.
myset:SECONDARY> rs.status()
{
"set" : "myset",
"date" : ISODate("2011-08-08T04:03:23Z"),
"myState" : 2,
"members" : [
{
"_id" : 0,
"name" : "host-a:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"optime" : {
"t" : 1312775799000,
"i" : 1
},
"optimeDate" : ISODate("2011-08-08T03:56:39Z"),
"self" : true
},
{
"_id" : 1,
"name" : "host-b",
"health" : 0,
"state" : 6,
"stateStr" : "(not reachable/healthy)",
"uptime" : 0,
"optime" : {
"t" : 0,
"i" : 0
},
"optimeDate" : ISODate("1970-01-01T00:00:00Z"),
"lastHeartbeat" : ISODate("2011-08-08T04:03:22Z"),
"errmsg" : "still initializing"
}
],
"ok" : 1
}
How could this happen? I just follow the guide in the document, did I do something wrong? Moreover, I can't do anything on current secondary server. It doesn't allow me to reconfig on the secondary node, but the problem is there is no primary node.
myset:SECONDARY> rs.reconfig({})
{
"errmsg" : "replSetReconfig command must be sent to the current replica set primary.",
"ok" : 0
}
Any ideas?
