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2025-04-02 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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Shulou(Shulou.com)06/01 Report--
Environment description
Primary node 192.168.0.1purl 27002
Two slave nodes
192.168.0.2:27002
192.168.0.3:27002
Goal: add the third slave node 192.168.0.3 with a consistent snapshot
Brief description of the steps:
1) perform a consistent snapshot backup on the primary node
2) restore the consistent snapshot from the node, restore only part of the data, and do not restore the oplog for the time being
3) initialize the oplog.rs collection and restore the oplog record
4) initialize the other two collections db.replset.election,db.system.replset of the local database
5) modify the database configuration and restart the database (the instance does not enable the authentication mode and the configuration of the replication set before this step)
6) use the rs.add ("HOST_NAME:PORT") command to add slave nodes to the cluster
7)。 Use rs.status () to observe the synchronization status and verify the integrity and consistency of the data
one。 Back up data on the master node or the other two slave nodes:
Mongodump-uroot-ptest-- host 192.168.0.2-- authenticationDatabase=admin-- port=27002-- oplog-o / data/mongo/backup
two。 Scp the backup file to 192.168.0.3 and restore it:
Scp-r / data/mongo/backup mongo@192.168.0.3/data/mongo
three。 The third node starts as a single instance:
Note: the following replica set parameters need to be commented out
# auth = true
# replSet = test27002
# replSet = repl_mongo
# keyFile = / data/mongo/27002/replSet.key
# su-mongo
$mongod-f / data/mongo/27002/conf/mongodb.conf
Consistent snapshot restore on 192.168.0.3:
$mongorestore-oplogReplay-port=27002 / data/mongo/backup
Create oplog.rs set merge initialization size:
> use local
> db.createCollection ("oplog.rs", {"capped": true, "size": 100000000})
Restore the data from the oplog.rs collection of consistent backups to 192.168.0.3:
$mongorestore-d local-c oplog.rs-- port=27002 / data/mongo/backup/oplog.bson
You need to query the data of the primary node replset.election collection and store the data to the 192.168.0.3 node
Actions on the primary DB:
$mongo 192.168.0.1:27002/admin-uroot-ptest
Test27002:PRIMARY > use local
Switched to db local
Test27002:PRIMARY > db.replset.election.find ()
{"_ id": ObjectId ("5d64912a1978c9b194cf7cc5"), "term": NumberLong (2), "candidateIndex": NumberLong (2)}
The data contents of the replset.election collection on the primary DB are saved on the 192.168.0.3 node:
Use local
Db.replset.election.save ({"_ id": ObjectId ("5d64912a1978c9b194cf7cc5"), "term": NumberLong (2), "candidateIndex": NumberLong (2)})
Close the third slave node and start mongodb as a replica set:
> use admin
Switched to db admin
> db.shutdownServer ()
Server should be down...
2019-09-01T18:10:57.337+0800 I NETWORK [js] trying reconnect to 127.0.0.1 purl 27002 failed
2019-09-01T18:10:57.337+0800 I NETWORK [js] reconnect 127.0.0.1 purl 27002 failed failed
>
>
Modify the configuration of the third slave node and remove the comments:
Auth = true
ReplSet = test27002
KeyFile = / data/mongo/27002/replSet.key
Start mongodb with a copy of the set
$mongod-f / data/mongo/27002/conf/mongodb.conf
The primary node performs the add node operation:
Mongo 192.168.0.1:27002/admin-uroot-ptest
> rs.add ("172.31.30.82 rig 27001")
Write data on the primary node:
Use test
For (var iTuno nisu test)
> db.test.count ()
Note: the above steps are similar to MySQL's method of adding a slave node using mysqldump or xtrabackup backup.
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