容器A中的程序连接容器B的mysql，报错Public Key Retrieval is not allowed。
解决办法如下：（在连接数据库的链接中加上）
当容器A程序连接容器B数据库时，useSSL=false&allowPublicKeyRetrieval=true
当本地连接容器中mysql时，useSSL=false
useSSL=false&allowPublicKeyRetrieval=true is what I needed only
when I tried connecting from docker_container1 to docker_container2_mysql(where mysql is installed)
within my local host. While from my host machine to docker_container2_mysql, useSSL=false is enough.