卸载cdh

1. 卸载Cloudera-Manager


sudo /usr/share/cmf/uninstall-cloudera-manager.sh 一直选择Yes 就好

卸载完成后，它会问你是否要将database里的数据清理，选择Yes

2. 如果没有uninstall-cloudera-manager.sh


    先停止服务
    sudo service cloudera-scm-server stop

    sudo service cloudera-scm-server-db stop
    
    sudo yum remove cloudera-manager-server
    
    sudo yum remove cloudera-manager-server-db

    1、删除所有CDH节点上的CDH服务

    sudo service cloudera-scm-agent hard_stop



    3、删除cloudera的安装目录

    sudo rm -rf /usr/share/cmf /var/lib/cloudera* /var/cache/yum/x86_64/6/cloudera* /var/log/cloudera* /var/run/cloudera*   
    
    **如报文件占用错误，重启机器，立即执行该命令
    
    数据库配置：
    
    rm -rf /etc/cloudera*


    3 卸载cloudera的rpm包
    查看安装了那些包
    rpm -qa | grep cloudera
    然后逐个将其删除
    for f in `rpm -qa | grep cloudera `  ; do rpm -e ${f} ; done

    4 清理Cloudera 相关文件
    sudo rm -rf /var/lib/flume-ng /var/lib/hadoop* /var/lib/hue /var/lib/oozie /var/lib/solr /var/lib/sqoop*
    sudo rm -rf /dfs /mapred /yarn
    rm -rf /var/run/hadoop* /var/run/flume-ng /var/run/cloudera* /var/run/oozie/ /var/run/sqoop2 /var/run/zookeeper /var/run/hbase /var/run/impala /var/run/hive /var/run/hdfs-sockets
    rm -rf /usr/lib/hadoop /usr/lib/hadoop* /usr/lib/hive /usr/lib/hbase /usr/lib/oozie /usr/lib/sqoop* /usr/lib/zookeeper /usr/lib/bigtop* /usr/lib/flume-ng /usr/lib/hcatalog
    rm -rf /usr/bin/hadoop* /usr/bin/zookeeper* /usr/bin/hbase* /usr/bin/hive* /usr/bin/hdfs /usr/bin/mapred /usr/bin/yarn /usr/bin/sqoop* /usr/bin/oozie
    rm -rf /etc/alternatives/*
    rm -rf /etc/hadoop* /etc/zookeeper* /etc/hive* /etc/hue /etc/impala /etc/sqoop* /etc/oozie /etc/hbase* /etc/hcatalog
    还有一个很重要的路径，之前从cdh4.5 update 到cdh5，一直有软链接到旧的4.5的目录，找了很久，终于在strace工具帮助下找到了问题所在。
    rm -rf /var/lib/alternatives/{cdh.app}
    简单的删除/var/lib/alternatives/* 下所有的文件是有风险的，由于系统可能还使用了alternatives做了其他的工具版本控制，所以楼主建议是挑出cdh相关的文件删除。
    
    5 杀死相关的进程 
      for u in hdfs mapred cloudera-scm hbase hue zookeeper oozie hive impala flume; do sudo kill $(ps -u $u -o pid=); done

    6 删除 Cloudera Manager的lock file
    sudo rm /tmp/.scm_prepare_node.lock
    
    7 删除parcel 包分发文件和解压文件
    rm -rf /opt/cloudera/parcel-cache /opt/cloudera/parcels
    这样，我们就完全清理干净。
    
    
    5、清除alternatives目录下配置

         命令如下：

        rm -rf /etc/alternatives/flume*
        
        rm -rf /etc/alternatives/hadoop*
        
        rm -rf /etc/alternatives/hbase*
        
        rm -rf /etc/alternatives/hive*
        
        rm -rf /etc/alternatives/hue*
        
        rm -rf /etc/alternatives/impala*
        
        rm -rf /etc/alternatives/llama*
        
        rm -rf /etc/alternatives/oozie*
        
        rm -rf /etc/alternatives/pig*
        
        rm -rf /etc/alternatives/solr*
        
        rm -rf /etc/alternatives/spark*
        
        rm -rf /etc/alternatives/sqoop*
        
        rm -rf /etc/alternatives/zookeeper*
            
            
    7、删除日志及缓存数据目录

         命令如下：

    tmpwatch -afv 1 /tmp
    
    rm -rf /opt/cloudera/*
    
    rm -rf /var/log/hadoop-*
    
    rm -rf /var/log/hue*
    
    rm -rf /var/log/oozie*
    
    rm -rf /var/log/sqoop*
    
    rm -rf /var/log/pig*
    
    rm -rf /var/log/hive*
    
    rm -rf /var/log/hbase*
    
    rm -rf /var/log/zookeeper*
    
    rm -rf /var/log/mahout*
    
    rm -rf /var/log/impala*
    
    rm -rf /var/log/hdfs*
    
    rm -rf /var/lib/hdfs*
    
    rm -rf /var/lib/alternatives/hdfs*
    
    rm -rf /var/run/hdfs*
    
    rm -rf /etc/hdfs*
    
    rm -rf /etc/alternatives/hdfs*
    
    rm -rf /usr/bin/hdfs*
    
    rm -rf /var/run/hdfs*
    
    rm -rf /var/log/yarn*
    
    rm -rf /var/log/whirr*
    
    rm -rf /var/log/mapred*
    
    rm -rf /var/lib/mapred*
    
    rm -rf /var/lib/alternatives/mapred*
    
    rm -rf /var/run/mapred*
    
    rm -rf /etc/mapred*
    
    rm -rf /etc/alternatives/mapred*
    
    rm -rf /usr/bin/mapred*
    
    rm -rf /var/run/mapred*
    
    8、杀死相关的进程
    
    for u in hdfs mapred cloudera-scm hbase hue zookeeper oozie hive impala flume spark; do sudo kill $(ps -u $u -o pid=); done
    
    9、删除 Cloudera Manager的lock file
    
    sudo rm /tmp/.scm_prepare_node.lock
    
    10、删除parcel 包分发文件和解压文件
    
    rm -rf /opt/cloudera/parcel-cache /opt/cloudera/parcels
注意：尽量参考官网卸载文档。