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Definition

listShards

Returns a list of the configured shards. listShards is only available for mongos instances. You can only issue listShards against the admin database.

The command takes the following form:

{ listShards: 1 }

Example

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",
      "maxSize": NumberLong("1024"),
      "state": 1
    }
  ],
  "ok": 1
}

Output

listShards returns a document containing the following fields:

  • A field named shards 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.
    maxSize The configured maximum storage size of the shard in megabytes. This includes all data files on the shard including the local and admin databases. If exceeded, this shard will not receive any more chunks.
    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.
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