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listShards

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  • Definition
  • Compatibility
  • Syntax
  • Example
  • Output
listShards

The listShards command returns a list of the configured shards in a sharded cluster. listShards is only available on mongos instances and must be issued against the admin database.

This command is available in deployments hosted in the following environments:

  • MongoDB Atlas: The fully managed service for MongoDB deployments in the cloud

Note

This command is not supported in serverless instances. For more information, see Unsupported Commands.

The command has the following syntax:

db.runCommand(
{
listShards: 1
}
)

The following operation runs listShards against the mongos admin database:

db.adminCommand({ listShards: 1 })

The following document is an example of the output from a listShards command:

{
"shards": [
{
"_id": "shard01",
"host": "shard01/host1:27018,host2:27018,host3:27018",
"state": 1
},
{
"_id": "shard02",
"host": "shard02/host4:27018,host5:27018,host6:27018",
"tags": [ "NYC" ],
"state": 1
},
{
"_id": "shard03",
"host": "shard03/host7:27018,host8:27018,host9:27018",
"state": 1
}
],
"ok": 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1510716515, 1),
"signature" : {
"hash" : BinData(0,"B2ViX7XLzFLS5Fl9XEuFXbwKIM4="),
"keyId" : NumberLong("6488045157173166092")
}
},
"operationTime" : Timestamp(1510716515, 1)
}

listShards returns a document that includes:

  • A shards field which contains an array of documents, each describing one shard. Each document may contain the following fields:

    Field
    Description
    _id
    The name of the shard.
    host
    The hostname of the shard. If the shard is a replica set, host lists the hostname of each mongod instance in the replica set.
    draining
    If true, indicates that removeShard has been called for this shard and it is in the process of being drained.
    tags
    A list of zones to which the shard belongs.
    state
    An internal field used during the addShard sequence to ensure that all steps and configuration necessary to add the shard to the cluster are completed.
  • The ok status field, the operationTime field, and the $clusterTime field for the operation. For details on these fields, see Response.

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