View Cluster Configuration

List Databases

To list your databases, query the databases collection in the Config Database. Connect mongosh to a mongos instance and run the following operation to get a full list of the databases in your cluster:

use config
db.databases.find()

List Shards

To list the current set of configured shards, use the listShards command, as follows:

db.adminCommand( { listShards : 1 } )

View Cluster Details

To view cluster details, issue db.printShardingStatus() or sh.status(). Both methods return the same output.

Example

In the following example output from sh.status()

sharding version displays the version number of the shard metadata.
shards displays a list of the mongod instances used as shards in the cluster.
databases displays information about all databases in the cluster.
The chunks information for the foo database displays how many chunks are on each shard and displays the range of each chunk.

--- Sharding Status ---
  sharding version: {
    "_id" : 1,
    "minCompatibleVersion" : 5,
    "currentVersion" : 6,
    "clusterId" : ObjectId("59a4443c3d38cd8a0b40316d")
  }
  shards:
    {  "_id" : "shard0000",  "host" : "m0.example.net:27018" }
    {  "_id" : "shard0001",  "host" : "m3.example2.net:27018" }
    {  "_id" : "shard0002",  "host" : "m2.example.net:27018" }
  active mongoses:
    "3.4.7" : 1
  autosplit:
    Currently enabled: yes
   balancer:
    Currently enabled:  yes
    Currently running:  no
    Failed balancer rounds in last 5 attempts:  0
    Migration Results for the last 24 hours:
       1 : Success
  databases:
    { "_id" : "foo", "primary" : "shard0000" }
        foo.contacts
            shard key: { "zip" : 1 }
            unique: false
            balancing: true
            chunks:
                shard0001    2
                shard0002    3
                shard0000    2
            { "zip" : { "$minKey" : 1 } } -->> { "zip" : "56000" } on : shard0001 { "t" : 2, "i" : 0 }
            { "zip" : 56000 } -->> { "zip" : "56800" } on : shard0002 { "t" : 3, "i" : 4 }
            { "zip" : 56800 } -->> { "zip" : "57088" } on : shard0002 { "t" : 4, "i" : 2 }
            { "zip" : 57088 } -->> { "zip" : "57500" } on : shard0002 { "t" : 4, "i" : 3 }
            { "zip" : 57500 } -->> { "zip" : "58140" } on : shard0001 { "t" : 4, "i" : 0 }
            { "zip" : 58140 } -->> { "zip" : "59000" } on : shard0000 { "t" : 4, "i" : 1 }
            { "zip" : 59000 } -->> { "zip" : { "$maxKey" : 1 } } on : shard0000 { "t" : 3, "i" : 3 }
    {  "_id" : "test", "primary" : "shard0000" }

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Consolidate Collection Data

Add Shards