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Create a dump on server A

A$ redis-cli
127.0.0.1:6379> CONFIG GET dir
1) "dir"
2) "/var/lib/redis/"
127.0.0.1:6379> SAVE
OK

This ensures dump.rdb is completely up-to-date, and shows us where it is stored (/var/lib/redis/dump.rdb in this case). dump.rdb is also periodically written to disk automatically.

Copy it to server B

A$ scp /var/lib/redis/dump.rdb myuser@B:/tmp/dump.rdb

Stop the Redis server on B, copy dump.rdb (ensuring permissions are the same as before), then start.

B$ sudo service redis-server stop
B$ sudo cp /tmp/dump.rdb /var/lib/redis/dump.rdb
B$ sudo chown redis: /var/lib/redis/dump.rdb
B$ sudo service redis-server start

The version of Redis on B must be greater or equal than that of A, or you may hit compatibility issues.

This is worked

• Stop redis (because redis overwrites the current rdb file when it exits).
• Copy your backup rdb file to the redis working directory (this is the dir option in your redis config). Also make sure your backup filename matches the dbfilename config option.
• Change the redis config appendonly flag to no (otherwise redis will ignore your rdb file when it starts).
• Start redis.
• Run redis-cli BGREWRITEAOF to create a new appendonly file.
• Restore redis config appendonly flag to yes.