MongoDB 3.0.1 Replication Setup - mongodb

I am using MongoDB 3.0.1 version. i am try to setup for mongodb replicaiton in
our machine. i have use three mongodb in septate machine for replication.
machine1 - master
machine2 - slave
machine3 - slave
I refer this url http://docs.mongodb.org/manual/tutorial/deploy-replica-set/
I have configure for every machine in mongodb.conf file
replSet = rs1
fork = true
and i added two members in master machine using this command
rs.add(192.168.1.2)
rs.add(192.168.1.3)
but i insert a document in master machine but not replicate other two slave machine. i did check slave machine throw the following error
> show dbs
2015-05-18T12:43:22.020+0530 E QUERY Error: listDatabases failed:{ "note" : "from execCommand", "ok" : 0, "errmsg" : "not master" }
at Error (<anonymous>)
at Mongo.getDBs (src/mongo/shell/mongo.js:47:15)
at shellHelper.show (src/mongo/shell/utils.js:630:33)
at shellHelper (src/mongo/shell/utils.js:524:36)
at (shellhelp2):1:1 at src/mongo/shell/mongo.js:47
>
> rs.conf()
2015-05-18T12:43:38.692+0530 E QUERY Error: Could not retrieve replica set config: {
"info" : "run rs.initiate(...) if not yet done for the set",
"ok" : 0,
"errmsg" : "no replset config has been received",
"code" : 94
}
at Function.rs.conf (src/mongo/shell/utils.js:1011:11)
at (shell):1:4 at src/mongo/shell/utils.js:1011
>
Please help me to solve the problem. thanks & Advance.
EDIT:
rs1:PRIMARY> rs.conf()
{
"_id" : "rs1",
"version" : 4,
"members" : [
{
"_id" : 0,
"host" : "analyzer-xubuntu:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : 0,
"votes" : 1
},
{
"_id" : 1,
"host" : "192.168.1.31:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 0.75,
"tags" : {
},
"slaveDelay" : 0,
"votes" : 1
},
{
"_id" : 2,
"host" : "192.168.1.33:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 0.5,
"tags" : {
},
"slaveDelay" : 0,
"votes" : 1
}
],
"settings" : {
"chainingAllowed" : true,
"heartbeatTimeoutSecs" : 10,
"getLastErrorModes" : {
},
"getLastErrorDefaults" : {
"w" : 1,
"wtimeout" : 0
}
}
}
rs1:PRIMARY> rs.status()
{
"set" : "rs1",
"date" : ISODate("2015-05-18T09:07:31.767Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "analyzer-xubuntu:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 9236,
"optime" : Timestamp(1431939509, 2),
"optimeDate" : ISODate("2015-05-18T08:58:29Z"),
"electionTime" : Timestamp(1431931054, 2),
"electionDate" : ISODate("2015-05-18T06:37:34Z"),
"configVersion" : 4,
"self" : true
},
{
"_id" : 1,
"name" : "192.168.1.31:27017",
"health" : 1,
"state" : 0,
"stateStr" : "STARTUP",
"uptime" : 8953,
"optime" : Timestamp(0, 0),
"optimeDate" : ISODate("1970-01-01T00:00:00Z"),
"lastHeartbeat" : ISODate("2015-05-18T09:07:29.831Z"),
"lastHeartbeatRecv" : ISODate("1970-01-01T00:00:00Z"),
"pingMs" : 1,
"configVersion" : -2
},
{
"_id" : 2,
"name" : "192.168.1.33:27017",
"health" : 1,
"state" : 0,
"stateStr" : "STARTUP",
"uptime" : 8946,
"optime" : Timestamp(0, 0),
"optimeDate" : ISODate("1970-01-01T00:00:00Z"),
"lastHeartbeat" : ISODate("2015-05-18T09:07:30.533Z"),
"lastHeartbeatRecv" : ISODate("1970-01-01T00:00:00Z"),
"pingMs" : 1,
"configVersion" : -2
}
],
"ok" : 1
}

Let us go step by step.
Your MongoDB config is ok, the rest of work may be done in the shell. I will use machine names instead of IPs.
First connect to machine1, and run the following there:
> conf = {
_id: "rs1",
members:
[
{_id : 0, host : "machine1:27017"},
{_id : 1, host : "machine2:27017"},
{_id : 2, host : "machine3:27017"}
]
}
> rs.initiate(conf)
Then just run rs.slaveOk() on the secondaries. The secondaries will start replicating, and you will be able to query them and see your data, inserted from the primary.

Related

pymongo unable to connect to primary

I'm trying to find_one by connecting to my replica set's primary node.
MongoClient(hostname, replicaSet="rs0", read_preference=ReadPreference.PRIMARY)
But it results in an error:
ServerSelectionTimeoutError: No replica set members match selector
"Primary()"
I'm able to successfully read using SECONDARY_PREFERRED. I also tried connecting using MongoReplicaSetClient with no success. I'm guessing this due to bad configuration, but what should I be looking for?
rs.status:
rs0:PRIMARY> rs.conf()
{
"_id" : "rs0",
"version" : 111313,
"protocolVersion" : NumberLong(1),
"members" : [
{
"_id" : 1,
"host" : "ANDROMEDA:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 2,
"host" : "mongo02.db.com:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 0.5,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 3,
"host" : "mongo03.db.com:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 0.5,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
}
],
"settings" : {
"chainingAllowed" : true,
"heartbeatIntervalMillis" : 2000,
"heartbeatTimeoutSecs" : 10,
"electionTimeoutMillis" : 10000,
"getLastErrorModes" : {
},
"getLastErrorDefaults" : {
"w" : 1,
"wtimeout" : 0
}
}
}
rs0:SECONDARY> rs.status()
{
"set" : "rs0",
"date" : ISODate("2016-08-04T08:58:02.293Z"),
"myState" : 2,
"term" : NumberLong(90),
"syncingTo" : "mongo03.db.com:27017",
"heartbeatIntervalMillis" : NumberLong(2000),
"members" : [
{
"_id" : 1,
"name" : "ANDROMEDA:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 2503,
"optime" : {
"ts" : Timestamp(1470299746, 1),
"t" : NumberLong(90)
},
"optimeDate" : ISODate("2016-08-04T08:35:46Z"),
"lastHeartbeat" : ISODate("2016-08-04T08:58:01.109Z"),
"lastHeartbeatRecv" : ISODate("2016-08-04T08:58:01.803Z"),
"pingMs" : NumberLong(28),
"electionTime" : Timestamp(1469600522, 1),
"electionDate" : ISODate("2016-07-27T06:22:02Z"),
"configVersion" : 111313
},
{
"_id" : 2,
"name" : "mongo02.db.com:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 7604104,
"optime" : {
"ts" : Timestamp(1470299746, 1),
"t" : NumberLong(90)
},
"optimeDate" : ISODate("2016-08-04T08:35:46Z"),
"syncingTo" : "mongo03.db.com:27017",
"configVersion" : 111313,
"self" : true
},
{
"_id" : 3,
"name" : "mongo03.db.com:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 2503,
"optime" : {
"ts" : Timestamp(1470299746, 1),
"t" : NumberLong(90)
},
"optimeDate" : ISODate("2016-08-04T08:35:46Z"),
"lastHeartbeat" : ISODate("2016-08-04T08:58:01.948Z"),
"lastHeartbeatRecv" : ISODate("2016-08-04T08:58:01.802Z"),
"pingMs" : NumberLong(28),
"syncingTo" : "ANDROMEDA:27017",
"configVersion" : 111313
}
],
"ok" : 1
}
In cases with an error message similar to ServerSelectionTimeoutError: No replica set members match selector "Primary()" and where replica set status function output, rs.status(), shows the Primary member using a non-FQDN (ANDROMEDA:27017 as in this case) then it is highly likely the application is unable to resolve the Primary host on the network.
You can easily check this using the following commands from the command line of the host running your application:
$ dig ANDROMEDA
$ ping ANDROMEDA
$ mongo --host ANDROMEDA:27017
If you don't have the Mongo Shell installed on the host running your application you can use Telnet instead.
$ telnet ANDROMEDA 27017
These outputs will allow you to check connectivity between your application host and your mongod host to determine if this is causing the problem.
I use this connection string:
MongoClient('mongodb://mongo01.db.com:27017,mongo02.db.com:27017,mongo03.db.com:27017/mydb',replicaSet="rs0", read_preference=ReadPreference.PRIMARY)

mongo replica set - data not replicating

I setup a test replcia set using mongo v3.2 on a single node and the rs.status() command in the mongo shell seems to indicate that the replica set is established (output below).
However, when I insert data into the primary, I can see that it gets inserted into the primary but I cannot seem to run the find operation on any of the secondary processes (message given below)
message on secondary
Error: error: { "ok" : 0, "errmsg" : "not master and slaveOk=false", "code" : 13435 }
rs.status()
{
"set" : "set0",
"date" : ISODate("2016-07-21T19:53:41.882Z"),
"myState" : 1,
"term" : NumberLong(1),
"heartbeatIntervalMillis" : NumberLong(2000),
"members" : [
{
"_id" : 0,
"name" : "127.0.0.1:27049",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 2388,
"optime" : {
"ts" : Timestamp(1469130790, 2),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2016-07-21T19:53:10Z"),
"electionTime" : Timestamp(1469128700, 1),
"electionDate" : ISODate("2016-07-21T19:18:20Z"),
"configVersion" : 1,
"self" : true
},
{
"_id" : 1,
"name" : "127.0.0.1:27050",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 2132,
"optime" : {
"ts" : Timestamp(1469130790, 2),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2016-07-21T19:53:10Z"),
"lastHeartbeat" : ISODate("2016-07-21T19:53:40.964Z"),
"lastHeartbeatRecv" : ISODate("2016-07-21T19:53:40.823Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "127.0.0.1:27049",
"configVersion" : 1
},
{
"_id" : 2,
"name" : "127.0.0.1:27051",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 2132,
"optime" : {
"ts" : Timestamp(1469130790, 2),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2016-07-21T19:53:10Z"),
"lastHeartbeat" : ISODate("2016-07-21T19:53:40.963Z"),
"lastHeartbeatRecv" : ISODate("2016-07-21T19:53:40.823Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "127.0.0.1:27049",
"configVersion" : 1
}
],
"ok" : 1
}
output from rs.conf() on primary
{
"_id" : "set0",
"version" : 1,
"protocolVersion" : NumberLong(1),
"members" : [
{
"_id" : 0,
"host" : "127.0.0.1:27049",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 1,
"host" : "127.0.0.1:27050",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 2,
"host" : "127.0.0.1:27051",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
}
],
"settings" : {
"chainingAllowed" : true,
"heartbeatIntervalMillis" : 2000,
"heartbeatTimeoutSecs" : 10,
"electionTimeoutMillis" : 10000,
"getLastErrorModes" : {
},
"getLastErrorDefaults" : {
"w" : 1,
"wtimeout" : 0
},
"replicaSetId" : ObjectId("57911ff0bd131f1aeb2ef878")
}
}
After I ran the following command on the secondary process, I was able to read the data from the secondary:
rs.slaveOk()
or
db.getMongo().setSlaveOk()
After running the following command from the Mongo shell, I was able to get the required documents from Mongo using the find command.

mongodb replica set is ok but does not replicate

I've created my mongodb replicaset and all is correct except is not replicate in remote host, but I've tried to access remote pc at the port 27017 and working properly.
I created the database on the remote PC to see if this solved but nothing, I have also inserted new records but nothing, Any ideas?
rs.status()
{
"set" : "meteor",
"date" : ISODate("2016-03-08T16:14:24.181Z"),
"myState" : 1,
"term" : NumberLong(3),
"heartbeatIntervalMillis" : NumberLong(2000),
"members" : [
{
"_id" : 0,
"name" : "172.27.10.13:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 6920,
"optime" : {
"ts" : Timestamp(1457453535, 2),
"t" : NumberLong(3)
},
"optimeDate" : ISODate("2016-03-08T16:12:15Z"),
"electionTime" : Timestamp(1457446744, 1),
"electionDate" : ISODate("2016-03-08T14:19:04Z"),
"configVersion" : 1,
"self" : true
}
],
"ok" : 1
}
rs.conf
rs.conf( rs.config(
meteor:PRIMARY> rs.config()
{
"_id" : "meteor",
"version" : 1,
"protocolVersion" : NumberLong(1),
"members" : [
{
"_id" : 0,
"host" : "172.27.10.13:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
}
],
"settings" : {
"chainingAllowed" : true,
"heartbeatIntervalMillis" : 2000,
"heartbeatTimeoutSecs" : 10,
"electionTimeoutMillis" : 10000,
"getLastErrorModes" : {
},
"getLastErrorDefaults" : {
"w" : 1,
"wtimeout" : 0
}
}
}
According to your configuration settings you didn't add any other members (secondaries, arbiters etc.) to your replica-set configuration. Beacuse of this mongodb has no way of knowing where to replicat to.
Try adding your remote host to the replica-set configuration like this:
rs.add("your-remote-host:port")
See: https://docs.mongodb.org/manual/tutorial/expand-replica-set/

MongoDb primary replica becomes secondary if secondary fails

I have 2 mongo replicas. One is primary and the second one is secondary. If I stop the secondary replica, the primary one becomes secondary and I lost the write permissions.
Here are my configs:
replica:PRIMARY> rs.status()
{
"set" : "replica",
"date" : ISODate("2016-02-26T11:27:50.140Z"),
"myState" : 1,
"members" : [
{
"_id" : 1,
"name" : "192.168.5.44:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 80,
"optime" : Timestamp(1456486069, 1),
"optimeDate" : ISODate("2016-02-26T11:27:49Z"),
"electionTime" : Timestamp(1456485992, 1),
"electionDate" : ISODate("2016-02-26T11:26:32Z"),
"configVersion" : 82935,
"self" : true
},
{
"_id" : 2,
"name" : "192.168.5.34:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 79,
"optime" : Timestamp(1456486067, 2),
"optimeDate" : ISODate("2016-02-26T11:27:47Z"),
"lastHeartbeat" : ISODate("2016-02-26T11:27:48.874Z"),
"lastHeartbeatRecv" : ISODate("2016-02-26T11:27:48.930Z"),
"pingMs" : 1,
"syncingTo" : "192.168.5.44:27017",
"configVersion" : 82935
}
],
"ok" : 1
}
replica:SECONDARY> rs.status()
{
"set" : "replica",
"date" : ISODate("2016-02-26T11:21:38.574Z"),
"myState" : 2,
"syncingTo" : "192.168.5.44:27017",
"members" : [
{
"_id" : 1,
"name" : "192.168.5.44:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 1306,
"optime" : Timestamp(1456485695, 3),
"optimeDate" : ISODate("2016-02-26T11:21:35Z"),
"lastHeartbeat" : ISODate("2016-02-26T11:21:36.602Z"),
"lastHeartbeatRecv" : ISODate("2016-02-26T11:21:37.412Z"),
"pingMs" : 0,
"electionTime" : Timestamp(1456484393, 1),
"electionDate" : ISODate("2016-02-26T10:59:53Z"),
"configVersion" : 82935
},
{
"_id" : 2,
"name" : "192.168.5.34:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 1306,
"optime" : Timestamp(1456485697, 1),
"optimeDate" : ISODate("2016-02-26T11:21:37Z"),
"syncingTo" : "192.168.5.44:27017",
"configVersion" : 82935,
"self" : true
}
],
"ok" : 1
}
replica:SECONDARY> cfg = rs.conf()
{
"_id" : "replica",
"version" : 82935,
"members" : [
{
"_id" : 1,
"host" : "192.168.5.44:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 2,
"tags" : {
},
"slaveDelay" : 0,
"votes" : 1
},
{
"_id" : 2,
"host" : "192.168.5.34:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : 0,
"votes" : 1
}
],
"settings" : {
"chainingAllowed" : true,
"heartbeatTimeoutSecs" : 10,
"getLastErrorModes" : {
},
"getLastErrorDefaults" : {
"w" : 1,
"wtimeout" : 0
}
}
}
Even if I shutdown the primary replica, the secondary won't become primary.
If you need any other details notify me.
Thank you for help!
MongoDB need the majority of members to accomplish an election. In a 2 members replication set, both member must be available to reach the majority. If one is down, another cannot be elected to primary.

mongoDB servers are not available when the master is down

Once I turn off the master node, the other nodes are down, too.
I can NOT get data from other nodes (if the master is down/off )
The following errors happends when the master replica is down
ConnectionPool::PoolShuttingDownError (ConnectionPool::PoolShuttingDownError):
Moped::Errors::ConnectionFailure (Could not connect to a primary node for replica set #<Moped::Cluster:70117691586500 #seeds=[<Moped::Node resolved_address="0.0.0.0:27017">]>
I have 3 mongoDB replicas.
It seems the primary replica is 172.19.16.109:27017
I don't understand why I shutdown the machine 172.19.16.109,
And remaining 2 replicas are unavailable to load data from its database.
Is it not making sense for the replicas ? Once if the master is shutdown, the others are also unavailable, too.
I expect that even if any replica is down, the others should work correctly.
My configurations are as below.
vvtk_dqa:PRIMARY> rs.conf()
{
"_id" : "vvtk_dqa",
"version" : 4,
"members" : [
{
"_id" : 1,
"host" : "172.19.16.109:27017"
},
{
"_id" : 2,
"host" : "172.19.16.104:27017"
},
{
"_id" : 3,
"host" : "192.168.14.7:27017"
}
]
}
mongodb.conf
# Where to store the data.
dbpath=/var/lib/mongodb
#where to log
logpath=/var/log/mongodb/mongodb.log
logappend=true
bind_ip = 0.0.0.0
#port = 27017
# Enable journaling, http://www.mongodb.org/display/DOCS/Journaling
journal=true
replSet=vvtk_dqa
isMaster
vvtk_dqa:PRIMARY> rs.isMaster()
{
"setName" : "vvtk_dqa",
"setVersion" : 4,
"ismaster" : true,
"secondary" : false,
"hosts" : [
"172.19.16.109:27017",
"192.168.14.7:27017",
"172.19.16.104:27017"
],
"primary" : "172.19.16.109:27017",
"me" : "172.19.16.109:27017",
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 1000,
"localTime" : ISODate("2015-02-11T02:05:12.021Z"),
"maxWireVersion" : 2,
"minWireVersion" : 0,
"ok" : 1
}
After I shutdown the 172.19.16.109, and type rs.status() on 192.168.14.7
and still can not get any data from 192.168.14.7 or 172.19.16.104
vvtk_dxa:PRIMARY> rs.status()
{
"set" : "vvtk_dqa",
"date" : ISODate("2015-02-12T01:51:37Z"),
"myState" : 1,
"members" : [
{
"_id" : 1,
"name" : "172.19.16.109:27017",
"health" : 0,
"state" : 8,
"stateStr" : "(not reachable/healthy)",
"uptime" : 0,
"optime" : Timestamp(1423649845, 1),
"optimeDate" : ISODate("2015-02-11T10:17:25Z"),
"lastHeartbeat" : ISODate("2015-02-12T01:51:28Z"),
"lastHeartbeatRecv" : ISODate("2015-02-11T10:31:04Z"),
"pingMs" : 0,
"syncingTo" : "192.168.14.7:27017"
},
{
"_id" : 2,
"name" : "172.19.16.104:27017",
"health" : 1,
"state" : 4,
"stateStr" : "FATAL",
"uptime" : 64832,
"optime" : Timestamp(1423545748, 1),
"optimeDate" : ISODate("2015-02-10T05:22:28Z"),
"lastHeartbeat" : ISODate("2015-02-12T01:51:37Z"),
"lastHeartbeatRecv" : ISODate("2015-02-12T01:51:35Z"),
"pingMs" : 0
},
{
"_id" : 3,
"name" : "192.168.14.7:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 64835,
"optime" : Timestamp(1423704914, 1),
"optimeDate" : ISODate("2015-02-12T01:35:14Z"),
"self" : true
}
],
"ok" : 1
}