mongodb 分片集合

我正在尝试拆分我的收藏。当我执行命令时：

sh.enableSharding("testdb")

我得到：

{
    "ok" : 1,
    "operationTime" : Timestamp(1552083125, 2),
    "$clusterTime" : {
        "clusterTime" : Timestamp(1552083125, 2),
        "signature" : {
            "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
            "keyId" : NumberLong(0)
        }
    }
}

现在，当我尝试使用以下命令对我的集合进行分片时：“sh.shardCollection("testdb.testcollection", {testkey:1})”

我收到错误：

{
    "ok" : 0,
    "errmsg" : "Cannot accept sharding commands if not started with --shardsvr",
    "code" : 193,
    "codeName" : "NoShardingEnabled",
    "operationTime" : Timestamp(1552083136, 4),
    "$clusterTime" : {
        "clusterTime" : Timestamp(1552083136, 4),
        "signature" : {
            "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
            "keyId" : NumberLong(0)
        }
    }
}

我检查了分片的状态，看起来它是成功的：

sh.status()
--- Sharding Status --- 
  sharding version: {
    "_id" : 1,
    "minCompatibleVersion" : 5,
    "currentVersion" : 6,
    "clusterId" : ObjectId("5c82df7b7a98360e9dd3c5da")
  }
  shards:
        {  "_id" : "shard0000",  "host" : "127.0.0.1:27023",  "state" : 1 }
        {  "_id" : "shard0001",  "host" : "127.0.0.1:27024",  "state" : 1 }
  active mongoses:
        "4.0.6" : 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: 
                No recent migrations
  databases:
        {  "_id" : "config",  "primary" : "config",  "partitioned" : true }
        {  "_id" : "testdb",  "primary" : "shard0000",  "partitioned" : true,  "version" : {  "uuid" : UUID("ed327ab3-1de9-4a0a-89f5-8d0bf81015fc"),  "lastMod" : 1 } }

那么为什么当我尝试 shardCollection 时会出现该错误？我在 mongos 实例中运行所有这些