JedisConnectionException: Could not get a resource from the pool

Caused by: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
	at redis.clients.util.Pool.getResource(Pool.java:53)
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused (Connection refused)
Caused by: java.net.ConnectException: Connection refused (Connection refused)
	at java.net.PlainSocketImpl.socketConnect(Native Method)

1. 密码配置错误
2. redis的ip配置错误
3. 没有配置，springboot默认取了localhost:6379
4. 看读取的是单机redis仍是集群redis，弄错了