使用ll命令和chown命令对zookeeper文件的拥有者进行修改后，在普通用户hadoop下启动zookeeper，但是报一下错误：

[hadoop@Slave1 zookeeper]$ bin/zkServer.sh start
JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... bin/zkServer.sh: line 113: /usr/local/zookeeper/zkdata/zookeeper_server.pid: Permission denied
FAILED TO WRITE PID
[hadoop@Slave1 zookeeper]$ 

主要错误点是：Permission denied FAILED TO WRITE PID，字面意思是没有写权限。

接下来，使用chmod命令增加权限，再次启动，成功：

[hadoop@Slave1 local]$ su
Password: 
[root@Slave1 local]# chmod a+xwr zookeeper/
[root@Slave1 local]# exit
exit
[hadoop@Slave1 local]$ cd zookeeper/
[hadoop@Slave1 zookeeper]$ bin/zkServer.sh start
JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[hadoop@Slave1 zookeeper]$