(error) READONLY You can‘t write against a read only replica.

If the above error occurs, it means that the current redis service is read-only and has no write permission. It is estimated that the service is used as a slave database.

solution:

• Open the configuration file corresponding to the redis service and change the value of the attribute slave-read-only to no, so that it can be written.
• Or a faster method is to redis-cliopen the client mode through a command and enter a slaveof no onecommand to stop the current redis service from receiving synchronization from other redis services and upgrade itself to the main database at the same time.