重启一个分片集群
The tutorial is specific to MongoDB 5.0. For earlier versions of MongoDB, refer to the corresponding version of the MongoDB Manual.
本教程对应的是MongoDB 5.0。对早期版本，可参考相关版本的手册。
This procedure demonstrates the shutdown and startup sequence for restarting a sharded cluster. Stopping or starting the components of a sharded cluster in a different order may cause communication errors between members. For example, shard servers may appear to hang if there are no config servers available.
这一部分演示重启一个分片集群时关闭和启动的顺序。使用不同的顺序停止和开启一个分片集群，可能会导致成员间的通信错误。例如，如果没有配置有效的服务器会导致分片服务器挂起。
Disable the balancer to stop chunk migration and do not perform any metadata write operations until the process finishes. If a migration is in progress, the balancer will complete the in-progress migration before stopping.
禁用平衡器以停止块迁移，在操作完成之前不要进行任何大数据写操作。如果迁移正在进行，平衡器会在停止前完成正在进行的迁移。
如果要关闭平衡器，连接一个mongos的实例，使用如下命令：
sh.stopBalancer()[1] | 自MongoDB 4.2开始，sh.stopBalancer()也可以禁用分片集群的自动分割功能。 |
use admin db.shutdownServer()Run
db.shutdownServer() from the admin database on each shard replica set member to shutdown its mongod process. Shutdown all secondary members before shutting down the primary in each replica set.Run
db.shutdownServer() from the admin database on each of the config servers to shutdown its mongod process. Shutdown all secondary members before shutting down the primary.Configuration File
配置文件
If using a configuration file, start the
mongod with the --config option set to the configuration file path.mongod --config <path-to-config-file>Command Line
** 命令行**
If using the command line options, start the
mongod with the --configsvr, --replSet, --bind_ip, and other options as appropriate to your deployment. For example:mongod --configsvr --replSet <replica set name> --dbpath <path> --bind_ip localhost,<hostname(s)|ip address(es)>After starting all config servers, connect to the primary
mongod and run rs.status() to confirm the health and availability of each CSRS member.Configuration File
** 配置文件**
If using a configuration file, start the
mongod with the --config option set to the configuration file path.mongod --config <path-to-config-file>Command Line
命令行
If using the command line option, start the
mongod with the --replSet, --shardsvr, and --bind_ip options, and other options as appropriate to your deployment. For example:如果使用命令行，使用
--replSet, --shardsvr和--bind_ip选项和其他相应选项启动mongod，例如：mongod --shardsvr --replSet <replSetname> --dbpath <path> --bind_ip localhost,<hostname(s)|ip address(es)>After starting all members of each shard, connect to each primary
mongod and run rs.status() to confirm the health and availability of each member.Start
mongos routers using either a configuration file or a command line parameter to specify the config servers.使用一个配置文件或者命令行参数指定配置服务器，启动 [
mongos]路由。Configuration File
** 配置文件**
If using a configuration file, start the
mongos specifying the --config option and the path to the configuration file.mongos --config <path-to-config>Command Line
** 命令行**
If using command line parameters, start the
mongos and specify the --configdb, --bind_ip, and other options as appropriate to your deployment. For example:WARNING
警告
Before binding to a non-localhost (e.g. publicly accessible) IP address, ensure you have secured your cluster from unauthorized access. For a complete list of security recommendations, see Security Checklist. At minimum, consider enabling authentication and hardening network infrastructure.
绑定到一个非本地IP地址之前，要确保你的集群如果遇到未授权访问的安全性。如果想查看安全建议的完整列表，查看Security Checklist。最少，考虑 enabling authentication 和 hardening network infrastructure。
mongos --configdb <configReplSetName>/cfg1.example.net:27019,cfg2.example.net:27019 --bind_ip localhost,<hostname(s)|ip address(es)>重新开启平衡器以恢复块迁移。
sh.startBalancer()[2] |
Connect a
mongo shell to one of the cluster's mongos processes. Use sh.status() to check the overall cluster status.To confirm that all shards are accessible and communicating, insert test data into a temporary sharded collection. Confirm that data is being split and migrated between each shard in your cluster. You can connect a
mongo shell to each shard primary and use db.collection.find() to validate that the data was sharded as expected.要确认所有的分片是可访问的和可通信的，把测试数据插入到一个临时的分片集合当中。在你的集合的每个分片间确认数据正在被分割和迁移。你可以把一个
mongo 命令行连接到每个分片的主块区，使用db.collection.find()验证数据 是否按预期进行了分片。IMPORTANT
重要
To prevent potential data loss or reading stale data, do not start application reads and writes to the cluster until after confirming the cluster is healthy and accessible.
为了避免潜在的数据丢失或读取垃圾数据，在确认集群是健康的和可访问之前，不要开始对集群的应用程序读写。
译者：张冲
时间：2021年8月20日
原文链接：https://docs.mongodb.com/manual/tutorial/restart-sharded-cluster/#stop-each-shard-replica-set