If you have a large number of Redis servers running, clearing the cache for each one manually will takes time. To speed this process up, you can use a tool like Ansible to clear the cache on all your Redis servers at the same time:
ansible all -m command -a '/usr/bin/redis-cli flushall '
Running this command applies the flushall command to every server in your Ansible inventory file:
all – Lets you choose all the remote hosts in the Ansible inventory file.
-m – Lets you choose a module to execute.
-a – Provides an argument for the module.
In this case, the command module runs the flushall command with redis-cli.