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从数据库转储恢复自管理分片集群

mongorestore is a tool that reads mongodump binary exports and restores the data to a MongoDB deployment. Use mongorestore to restore a sharded cluster from a mongodump backup.

开始之前

Ensure you have a mongodump backup of your source cluster. To create one, see Back Up a Self-Managed Sharded Cluster with a Database Dump. If you have file system snapshots, see Restore a Self-Managed Sharded Cluster from Snapshots.

步骤

停止负载均衡器。

为防止数据块迁移干扰恢复，请连接到 mongos 并停止负载均衡器：

sh.stopBalancer()

要验证您已停止了负载均衡器，请运行：

use config
while( sh.isBalancerRunning().mode != "off" ) {
   print( "Waiting for Balancer to stop..." );
   sleep( 1000 );
}

在目标集群上对集合进行分片前处理。

对于源集群中的每个分片集合，请在恢复数据之前，在目标集群上创建集合并使用相同的分片键对其进行分片。

要查找每个集合的分片键，请查询活的源集群：

use config
db.collections.find()

Alternatively, you can use bsondump to inspect the config/collections.bson file from your dump directory:

bsondump /path/to/dump/config/collections.bson

{
  "_id": "<database>.<collection>",
  ...
  "key": { "<shardKeyField>": "<key>" },
  ...
}

注意

有效的分片键值为 1 或 "hashed"。

对于每个分片集合，使用相同的分片键在目标集群上对集合进行分片：

sh.shardCollection(
   "<database-name>.<collection-name>",
   { <shardKeyField>: <key> }
)

恢复集群。

Use mongorestore to connect to mongos and restore the cluster. Exclude the config database to preserve the destination cluster's existing configuration:

mongorestore \
   --host <host> \
   --port 27017 \
   --username <username> \
   --password "<password>" \
   --authenticationDatabase admin \
   --nsExclude='config.*' \
   /path/to/backup

重要

The --drop option drops the collection before restoring. If you use --drop after pre-sharding collections, mongorestore removes the sharding configuration.