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I am trying to test my cache was implemented with redis clustering (cluster by server not client). I have to flush redis every time I run a unit test. when I try to run flushdb command I got this error: Cannot use 'FLUSHDB' with redis-cluster. it seems that I can run flushdb command in cluster mode only when I set the slot but I do not know how to do it. (I have overridden redis wrapper of laravel so laravel is not the case If you learn me how to use predis I can adopt it with laravel)
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To clear data of a DCS Redis 4.0 or 5.0 instance, you can run the FLUSHDB or FLUSHALL command in redis-cli, use the data clearing function on the DCS console, or run the FLUSHDB command on Web CLI. To clear data of a Redis Cluster instance, run the FLUSHDB or FLUSHALL command on every shard of the instance.
The easiest way to clear Redis cache is to use the redis-cli command. Databases in Redis are stored individually. Using the redis-cli command allows you to either clear the keys from all databases, or from a single specified database only.
What is the command to delete all keys from my redis cluster? FLUSHDB command – Delete all the keys of the currently selected DB. FLUSHALL command – Remove all the keys of all the existing databases, not just the currently selected one.
A shard (in the API and CLI, a node group) is a hierarchical arrangement of nodes, each wrapped in a cluster. Shards support replication. Within a shard, one node functions as the read/write primary node. All the other nodes in a shard function as read-only replicas of the primary node.
For deleting by pattern:
redis-cli --raw keys "$PATTERN" | xargs redis-cli del
for example:
redis-cli KEYS "prefix:*" | xargs redis-cli DEL
For deleting all keys from one db:
redis-cli flushdb
For deleting all keys from all dbs:
redis-cli flushall
For cluster mode you need to use this bash script: https://gist.github.com/yaud/85e0382d26c189bdf84f0297cd54f479 to remove all nodes from master nodes (slave nodes will be synced)
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