Hadoop单点安装FAQ

安装源：yum install epel-release -y
Q1:
Starting namenodes on [localhost]
ERROR: Attempting to launch hdfs namenode as root
ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting launch.

解决1：
是因为缺少用户定义造成的，所以分别编辑开始和关闭脚本
$ vim sbin/start-dfs.sh
$ vim sbin/stop-dfs.sh
在顶部空白处添加内容：
HDFS_DATANODE_USER=root
HADOOP_SECURE_DN_USER=hdfs
HDFS_NAMENODE_USER=root
HDFS_SECONDARYNAMENODE_USER=root

Q2:
Starting resourcemanager
ERROR: Attempting to launch yarn resourcemanager as root
ERROR: but there is no YARN_RESOURCEMANAGER_USER defined. Aborting launch.
Starting nodemanagers
ERROR: Attempting to launch yarn nodemanager as root
ERROR: but there is no YARN_NODEMANAGER_USER defined. Aborting launch.
解决2：
是因为缺少用户定义造成的，所以分别编辑开始和关闭脚本
$ vim sbin/start-yarn.sh
$ vim sbin/stop-yarn.sh