check config server status from mongos

[Tim]

Hello,

How do I check the status of my config server from a mongos process

I login to my mongos

mongo host:port/admin
mongos>

and then? Does config.status() or something like this exists?

Thanks,
best regards,
Tim

[markh]

Hi Tim,

What exactly do you mean by "status"?

If you mean "config.status()" like "rs.status()", there's no such a command.

If you want to verify that each of the config servers are up then you could connect directly to each mongod config server through the mongo shell.

Remember that the mongos only has the cached data. One thing you could do to check the status is to run flushRouterConfig and refresh the shard cluster metadata on the mongos. Please note though that this will only contact one config server (not all three).

Thanks

Mark

[Tim]

Hi Mark,

Yes, I want to verify that each config server is up. I checked the Server by using "top", there was a mongod instance running. How would I connect from mongos to the config server?

mongo host:port/admin

and then?

thanks,
Tim

[Scott Hernandez]

Running db.isMaster() or db.serverStatus() should suffice as a simple
test; this is true with any server instance.

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[Tim]

I thought about checking the config Server status from the mongos shell - is that possible with 'db.isMaster()' or 'db.serverStatus()' ?
Thanks

[Eliot Horowitz]

The best thing to do is:
connect to a mongos
use config
db.adminCommand( "fsync" )

That will make sure all config servers are up and healthy.

[David Richardson]

I get the same response whether they're all up or not.

mongos> db.adminCommand( "fsync" )
{
        "numFiles" : 151,
        "all" : {
                "shard1_replica_set" : {
                        "numFiles" : 77,
                        "ok" : 1
                },
                "shard2_replica_set" : {
                        "numFiles" : 74,
                        "ok" : 1
                }
        },
        "ok" : 1
}