[root@mini1 redis-4.0.]# src/redis-server ./redis.conf 

[root@mini1 redis-4.0.2]# src/redis-cli 

How I can switch to AOF, if I'm currently using dump.rdb snapshots?

There is a different procedure to do this in Redis 2.0 and Redis 2.2, as you can guess it's simpler in Redis 2.2 and does not require a restart at all.

Redis >= 2.2

Make a backup of your latest dump.rdb file.

Transfer this backup into a safe place.

Issue the following two commands:

redis-cli config set appendonly yes

redis-cli config set save ""

Make sure that your database contains the same number of keys it contained.

Make sure that writes are appended to the append only file correctly.

The first CONFIG command enables the Append Only File. In order to do so Redis will block to generate the initial dump, then will open the file for writing, and will start appending all the next write queries.

The second CONFIG command is used to turn off snapshotting persistence. This is optional, if you wish you can take both the persistence methods enabled.

IMPORTANT: remember to edit your redis.conf to turn on the AOF, otherwise when you restart the server the configuration changes will be lost and the server will start again with the old configuration.

config set appendonly yes

config set save ""

[root@mini1 backup]# less appendonly.aof