ERROR: Cannot set priority of registrydns process 33740

hdp安装yarn时，yarn registry dns无法启动。报错 ERROR: Cannot set priority of registrydns process xxxxx

原因：

The default port for Registry DNS is 53. Check if that port is opened

netstat -tnlpa | grep 53

若占用 修改 默认端口

 

 修改后，保存退出，重启yarn。问题解决