#1.删除hdp.repo和hdp-util.repo
cd /etc/yum.repos.d/
rm -rf hdp*
rm -rf HDP*
#rm -rf ambari*
#2.删除安装包
#用yum list installed | grep HDP来检查安装的ambari的包
yum remove -y  sqoop.noarch
yum remove -y  lzo-devel.x86_64
yum remove -y  hadoop-libhdfs.x86_64
yum remove -y  rrdtool.x86_64
yum remove -y  hbase.noarch
yum remove -y  pig.noarch
yum remove -y  lzo.x86_64
yum remove -y  ambari-log4j.noarch
yum remove -y  oozie.noarch
yum remove -y  oozie-client.noarch
yum remove -y  gweb.noarch
yum remove -y  snappy-devel.x86_64
yum remove -y  hcatalog.noarch
yum remove -y  python-rrdtool.x86_64
yum remove -y  nagios.x86_64
yum remove -y  webhcat-tar-pig.noarch
yum remove -y  snappy.x86_64
yum remove -y  libconfuse.x86_64
yum remove -y  webhcat-tar-hive.noarch
yum remove -y  ganglia-gmetad.x86_64
yum remove -y  extjs.noarch
yum remove -y  hive.noarch
yum remove -y  hadoop-lzo.x86_64
yum remove -y  hadoop-lzo-native.x86_64
yum remove -y  hadoop-native.x86_64
yum remove -y  hadoop-pipes.x86_64
yum remove -y  nagios-plugins.x86_64
yum remove -y  hadoop.x86_64
yum remove -y  zookeeper.noarch
yum remove -y  hadoop-sbin.x86_64
yum remove -y  ganglia-gmond.x86_64
yum remove -y  libganglia.x86_64
yum remove -y  perl-rrdtool.x86_64
yum remove -y  epel-release.noarch
yum remove -y  compat-readline5*
yum remove -y  fping.x86_64
yum remove -y  perl-Crypt-DES.x86_64
yum remove -y  exim.x86_64
yum remove -y ganglia-web.noarch
yum remove -y perl-Digest-HMAC.noarch
yum remove -y perl-Digest-SHA1.x86_64
#3.删除快捷方式
cd /etc/alternatives
rm -rf hadoop-etc
rm -rf zookeeper-conf
rm -rf hbase-conf
rm -rf hadoop-log
rm -rf hadoop-lib
rm -rf hadoop-default
rm -rf oozie-conf
rm -rf hcatalog-conf
rm -rf hive-conf
rm -rf hadoop-man
rm -rf sqoop-conf
rm -rf hadoop-conf
#4.删除用户
userdel nagios
userdel hive
userdel ambari-qa
userdel hbase
userdel oozie
userdel hcat
userdel mapred
userdel hdfs
userdel rrdcached
userdel zookeeper
#userdel mysql
userdel sqoop
userdel puppet
#5.删除文件夹
rm -rf /hadoop
rm -rf /etc/hadoop
rm -rf /etc/hbase
rm -rf /etc/hcatalog
rm -rf /etc/hive
rm -rf /etc/ganglia
rm -rf /etc/nagios
rm -rf /etc/oozie
rm -rf /etc/sqoop
rm -rf /etc/zookeeper
rm -rf /var/run/hadoop
rm -rf /var/run/hbase
rm -rf /var/run/hive
rm -rf /var/run/ganglia
rm -rf /var/run/nagios
rm -rf /var/run/oozie
rm -rf /var/run/zookeeper
rm -rf /var/log/hadoop
rm -rf /var/log/hbase
rm -rf /var/log/hive
rm -rf /var/log/nagios
rm -rf /var/log/oozie
rm -rf /var/log/zookeeper
rm -rf /usr/lib/hadoop
rm -rf /usr/lib/hbase
rm -rf /usr/lib/hcatalog
rm -rf /usr/lib/hive
rm -rf /usr/lib/oozie
rm -rf /usr/lib/sqoop
rm -rf /usr/lib/zookeeper
rm -rf /var/lib/hive
rm -rf /var/lib/ganglia
rm -rf /var/lib/oozie
rm -rf /var/lib/zookeeper
rm -rf /var/tmp/oozie
rm -rf /tmp/hive
rm -rf /tmp/nagios
rm -rf /tmp/ambari-qa
rm -rf /tmp/sqoop-ambari-qa
rm -rf /var/nagios
rm -rf /hadoop/oozie
rm -rf /hadoop/zookeeper
rm -rf /hadoop/mapred
rm -rf /hadoop/hdfs
rm -rf /tmp/hadoop-hive
rm -rf /tmp/hadoop-nagios
rm -rf /tmp/hadoop-hcat
rm -rf /tmp/hadoop-ambari-qa
rm -rf /tmp/hsperfdata_hbase
rm -rf /tmp/hsperfdata_hive
rm -rf /tmp/hsperfdata_nagios
rm -rf /tmp/hsperfdata_oozie
rm -rf /tmp/hsperfdata_zookeeper
rm -rf /tmp/hsperfdata_mapred
rm -rf /tmp/hsperfdata_hdfs
rm -rf /tmp/hsperfdata_hcat
rm -rf /tmp/hsperfdata_ambari-qa
#5.重置数据库，删除ambari包
#采用这句命令来检查yum list installed | grep ambari
ambari-server stop
ambari-agent stop
ambari-server reset
yum remove -y ambari-*
yum remove -y postgresql
rm -rf /etc/yum.repos.d/ambari*
rm -rf /var/lib/ambari*
rm -rf /var/log/ambari*
rm -rf /etc/ambari*

这个脚本给安装失败，需要重新安装的人用的，在ambari的官网上找的，然后自己花了一个小时写出来的，哎、、希望对大家有帮助。