社区原文：https://community.hortonworks.com/articles/97489/completely-uninstall-hdp-and-ambari.html

Ambari部署：https://docs.hortonworks.com/HDPDocuments/Ambari-2.4.1.0/bk_ambari-installation/content/ch_Getting_Ready.html

简介：

在不需要重装操作系统的情况下完全卸载HDP，并准备好自动安装HDP2.6的环境。

文章：

升级HDP失败后，我被迫彻底清除HDP 2.4，Ambari 2.5并安装HDP 2.6。 我想避免重新安装操作系统，所以执行了如下的步骤。

1、停止在Ambari中的所有服务或杀死他们

可以通过ambari控制台停止所有服务。在我的情况下，Ambari在降级时损坏了他的数据库，无法启动。 所以我手动杀死所有节点上的所有进程：

$ ps -u  hdfs (可以看到所有服务列表)  

$ kill PID  

2、在所有集群节点上运行python脚本

$ python /usr/lib/python2.6/site-packages/ambari_agent/HostCleanup.py –silent –skip=users

3、删除所有节点上的Hadoop包

yum remove hive\* -y
yum remove oozie\* -y
yum remove pig\* -y
yum remove zookeeper\* -y
yum remove tez\* -y
yum remove hbase\* -y
yum remove ranger\* -y
yum remove knox\* -y
yum remove storm\* -y
yum remove accumulo\* -y
yum remove falcon\* -y
yum remove ambari-metrics-hadoop-sink -y
yum remove smartsense-hst -y
yum remove slider_2_4_2_0_258 -y
yum remove ambari-metrics-monitor -y
yum remove spark2_2_5_3_0_37-yarn-shuffle -y
yum remove spark_2_5_3_0_37-yarn-shuffle -y
yum remove ambari-infra-solr-client -y

4、删除ambari-server（在Ambari主机上）和ambari-agent（在所有节点上）

ambari-server stop

ambari-agent stop

yum erase ambari-server -y

yum erase ambari-agent -y

5、删除所有节点上的存储库

rm -rf /etc/yum.repos.d/ambari.repo /etc/yum.repos.d/HDP*

yum clean all

6、删除所有节点上的日志文件夹

rm -rf /var/log/ambari-agent

rm -rf /var/log/ambari-metrics-grafana

rm -rf /var/log/ambari-metrics-monitor

rm -rf /var/log/ambari-server/

rm -rf /var/log/falcon

rm -rf /var/log/flume

rm -rf /var/log/hadoop

rm -rf /var/log/hadoop-mapreduce

rm -rf /var/log/hadoop-yarn

rm -rf /var/log/hive

rm -rf /var/log/hive-hcatalog

rm -rf /var/log/hive2

rm -rf /var/log/hst

rm -rf /var/log/knox

rm -rf /var/log/oozie

rm -rf /var/log/solr

rm -rf /var/log/zookeeper

7、删除所有节点上的Hadoop文件夹，包括HDFS数据

rm -rf /hadoop/*

rm -rf /hdfs/hadoop

rm -rf /hdfs/lost+found

rm -rf /hdfs/var

rm -rf /local/opt/hadoop

rm -rf /tmp/hadoop

rm -rf /usr/bin/hadoop

rm -rf /usr/hdp

rm -rf /var/hadoop

8、删除所有节点上的配置文件夹

rm -rf /etc/ambari-agent

rm -rf /etc/ambari-metrics-grafana

rm -rf /etc/ambari-server

rm -rf /etc/ams-hbase

rm -rf /etc/falcon

rm -rf /etc/flume

rm -rf /etc/hadoop

rm -rf /etc/hadoop-httpfs

rm -rf /etc/hbase

rm -rf /etc/hive

rm -rf /etc/hive-hcatalog

rm -rf /etc/hive-webhcat

rm -rf /etc/hive2

rm -rf /etc/hst

rm -rf /etc/knox

rm -rf /etc/livy

rm -rf /etc/mahout

rm -rf /etc/oozie

rm -rf /etc/phoenix

rm -rf /etc/pig

rm -rf /etc/ranger-admin

rm -rf /etc/ranger-usersync

rm -rf /etc/spark2

rm -rf /etc/tez

rm -rf /etc/tez_hive2  

rm -rf /etc/zookeeper  

9、删除所有节点上的PID

rm -rf /var/run/ambari-agent

rm -rf /var/run/ambari-metrics-grafana

rm -rf /var/run/ambari-server

rm -rf /var/run/falcon

rm -rf /var/run/flume

rm -rf /var/run/hadoop

rm -rf /var/run/hadoop-mapreduce

rm -rf /var/run/hadoop-yarn

rm -rf /var/run/hbase

rm -rf /var/run/hive

rm -rf /var/run/hive-hcatalog

rm -rf /var/run/hive2

rm -rf /var/run/hst

rm -rf /var/run/knox

rm -rf /var/run/oozie

rm -rf /var/run/webhcat

rm -rf /var/run/zookeeper

10、删除所有节点上的库文件夹

rm -rf /usr/lib/ambari-agent

rm -rf /usr/lib/ambari-infra-solr-client

rm -rf /usr/lib/ambari-metrics-hadoop-sink

rm -rf /usr/lib/ambari-metrics-kafka-sink

rm -rf /usr/lib/ambari-server-backups

rm -rf /usr/lib/ams-hbase

rm -rf /usr/lib/mysql

rm -rf /var/lib/ambari-agent

rm -rf /var/lib/ambari-metrics-grafana

rm -rf /var/lib/ambari-server

rm -rf /var/lib/flume

rm -rf /var/lib/hadoop-hdfs

rm -rf /var/lib/hadoop-mapreduce

rm -rf /var/lib/hadoop-yarn

rm -rf /var/lib/hive2

rm -rf /var/lib/knox

rm -rf /var/lib/smartsense  

rm -rf /var/lib/storm  

11、清除所有节点上的文件夹/var/tmp/*

rm -rf /var/tmp/*

12、从cron在所有节点上删除HST

/usr/hdp/share/hst/bin/hst-scheduled-capture.sh sync  

/usr/hdp/share/hst/bin/hst-scheduled-capture.sh  

13、删除数据库。 删除MySQL和Postgres的实例，以便Ambari安装和配置新的数据库。

yum remove mysql mysql-server -y

yum erase postgresql -y

rm -rf /var/lib/pgsql

rm -rf /var/lib/mysql

14、删除所有节点上的符号链接。

尤其是检查文件夹/usr/sbin和/usr/lib/python2.6/site-packages

cd /usr/bin

rm -rf accumulo

rm -rf atlas-start

rm -rf atlas-stop

rm -rf beeline

rm -rf falcon

rm -rf flume-ng

rm -rf hbase

rm -rf hcat

rm -rf hdfs

rm -rf hive

rm -rf hiveserver2

rm -rf kafka

rm -rf mahout

rm -rf mapred

rm -rf oozie

rm -rf oozied.sh

rm -rf phoenix-psql

rm -rf phoenix-queryserver

rm -rf phoenix-sqlline

rm -rf phoenix-sqlline-thin

rm -rf pig

rm -rf python-wrap

rm -rf ranger-admin

rm -rf ranger-admin-start

rm -rf ranger-admin-stop

rm -rf ranger-kms

rm -rf ranger-usersync

rm -rf ranger-usersync-start

rm -rf ranger-usersync-stop

rm -rf slider

rm -rf sqoop

rm -rf sqoop-codegen

rm -rf sqoop-create-hive-table

rm -rf sqoop-eval

rm -rf sqoop-export

rm -rf sqoop-help

rm -rf sqoop-import

rm -rf sqoop-import-all-tables

rm -rf sqoop-job

rm -rf sqoop-list-databases

rm -rf sqoop-list-tables

rm -rf sqoop-merge

rm -rf sqoop-metastore

rm -rf sqoop-version

rm -rf storm

rm -rf storm-slider

rm -rf worker-lanucher

rm -rf yarn

rm -rf zookeeper-client

rm -rf zookeeper-server  

rm -rf zookeeper-server-cleanup  

15、删除所有节点上的服务用户

userdel -r accumulo

userdel -r ambari-qa

userdel -r ams

userdel -r falcon

userdel -r flume

userdel -r hbase

userdel -r hcat

userdel -r hdfs

userdel -r hive

userdel -r kafka

userdel -r knox

userdel -r mapred

userdel -r oozie

userdel -r ranger

userdel -r spark

userdel -r sqoop

userdel -r storm

userdel -r tez

userdel -r yarn

userdel -r zeppelin

userdel -r zookeeper

16、在所有节点上运行find / -name **

你一定会找到更多的文件/文件夹。 删除它们

find / -name *ambari* | xargs rm -rf
find / -name *accumulo* | xargs rm -rf
find / -name *atlas* | xargs rm -rf
find / -name *beeline* | xargs rm -rf
find / -name *falcon* | xargs rm -rf
find / -name *flume* | xargs rm -rf
find / -name *hadoop* | xargs rm -rf
find / -name *hbase* | xargs rm -rf
find / -name *hcat* | xargs rm -rf
find / -name *hdfs* | xargs rm -rf
find / -name *hdp* | xargs rm -rf
find / -name *hive* | xargs rm -rf
find / -name *hiveserver2* | xargs rm -rf
find / -name *kafka* | xargs rm -rf
find / -name *mahout* | xargs rm -rf
find / -name *mapred* | xargs rm -rf
find / -name *oozie* | xargs rm -rf
find / -name *phoenix* | xargs rm -rf
find / -name *pig* | xargs rm -rf
find / -name *ranger* | xargs rm -rf
find / -name *slider* | xargs rm -rf
find / -name *sqoop* | xargs rm -rf
find / -name *storm* | xargs rm -rf
find / -name *yarn* | xargs rm -rf
find / -name *zookeeper* | xargs rm -rf

17、重新启动所有节点

reboot