问题：HDP安装部署时在confirm hosts时卡在preparing
检查ambari-server的日志发现：
29 三月 2019 10:26:06,498 INFO [Thread-31] BSRunner:372 - Error executing bootstrap Cannot create /var/run/ambari-server/bootstrap
29 三月 2019 10:26:06,498 ERROR [Thread-31] BSRunner:441 - java.io.FileNotFoundException: /var/run/ambari-server/bootstrap/1/hdpmaster.done (没有那个文件或目录)
29 三月 2019 10:26:06,499 WARN [Thread-31] BSRunner:401 - File does not exist: /var/run/ambari-server/bootstrap/1/sshKey
解决方法：参考https://stackoverflow.com/questions/20115972/hadoop-ambari-cannot-confirm-hosts
使用如下命令重装ambari-server
ambari-server stop
ambari-server reset
ambari-server setup
ambari-server start问题解决