Magento 2 - Use Redis in Full Page Cache and Backend Cache

For Backend cache on Redis

use below sample command:

php bin/magento setup:config:set --cache-backend=redis --cache-backend-redis-server=xxxxxxxxxxx --cache-backend-redis-db=0

For Page Cache on Redis

use below sample command:

php bin/magento setup:config:set --page-cache=redis --page-cache-redis-server=xxxxxxxxxxx --page-cache-redis-db=1

Both cache could be save on same redis server but it will use different databases 0 and 1

Note: For local redis cache, use 127.0.0.1