Redis SYNCWITHACK Redis could not synchronize with the master

Synchronization between the replica and the master failed.
  1. Check the connectivity between the Redis replica and master instances:
    • ping <master_ip_address>
  2. Verify if the master and replica Redis instances are up and running:
    • redis-cli -h <master_ip_address> -p <master_port> ping
    • redis-cli -h <replica_ip_address> -p <replica_port> ping
  3. Examine the replication status and error messages in the logs:
    • redis-cli -h <replica_ip_address> -p <replica_port> info replication
    • Check the Redis log files, typically located in /var/log/redis/ on Linux systems.
  4. Ensure that the replicaof directive in the replica’s configuration file is correctly pointing to the master’s IP address and port.
  5. If the issue persists, force a manual resynchronization:
    • redis-cli -h <replica_ip_address> -p <replica_port> replicaof no one
    • redis-cli -h <replica_ip_address> -p <replica_port> replicaof <master_ip_address> <master_port>

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