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

Because the master-slave replication cluster was configured before, the configuration was changed disorderly

There are two solutions:

1. 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.

2. Open the client mode through the redis cli command, and enter the slave of no one command

Read More: