我正在尝试使用以下配置创建postgres接收器连接器：

{
  "name": "postgres-kafka-connector",
  "connector.class": "io.confluent.connect.jdbc.JdbcSinkConnector",
  "tasks.max": "10",
  "key.converter": "org.apache.kafka.connect.storage.StringConverter",
  "value.converter": "org.apache.kafka.connect.converters.ByteArrayConverter",
  "topics": "test-topic",
  "connection.url": "jdbc:postgresql:test-18172ff-postgres:5432/b1x",
  "connection.user": "postgres",
  "connection.password": "*************",
  "auto.create": "true"
}

但是，当查看kafka connect中的日志时，我看到以下内容： org.apache.kafka.connect.errors.ConnectException: org.postgresql.util.PSQLException: Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP 重要提示：我试图运行这个Kafka设置在Kubernetes。
知道为什么会这样吗？