2.consumer: Cannot connect to redis://127.0.0.1:6379/2: Authentication required..

2.consumer: Cannot connect to redis://127.0.0.1:6379/2: Authentication required..

[tasks]
  . celery_task.send_email

[2022-09-13 00:52:33,810: ERROR/MainProcess] consumer: Cannot connect to redis://127.0.0.1:6379/2: Authentication required..
Trying again in 2.00 seconds... (1/100)

连接不上redis的原因是，redis设置了密码，而连接时没有携带密码连接。
解决办法：在连接前配置好redis连接密码

backend = 'redis://:密码@ip:port/区'                

ps: 
   backend = 'redis://:root@127.0.0.1:6379/1'