初步進入centos學習，配置用戶
1，創建用戶
創建用戶 hadoop
[root@master spark]# useradd hadoop
[root@master spark]#
2，創建密碼
[root@master spark]# passwd hadoop Changing password for user hadoop. New password: BAD PASSWORD: The password is shorter than 8 characters Retype new password: passwd: all authentication tokens updated successfully.
3，用戶授權
創建賬戶必須授權，不然，個人用戶的權限只可以在本home下有權限，其他的必須有授權，一般需要root的權限
sudo的命令授權一般在sudoers里面
找到sudoer文件位置
看下文件的權限
[spark@master ~]$ sudoers -bash: sudoers: command not found [spark@master ~]$ whereis sudoers sudoers: /etc/sudoers /etc/sudoers.d /usr/share/man/man5/sudoers.5.gz
只讀的文件，可以修改權限或者強行保存
[root@centos etc]# vi /etc/sudoers ## Allow root to run any commands anywher root ALL=(ALL) ALL #這個是新增的用戶 hadoop ALL=(ALL) ALL #這個是新增的用戶
用x！命令強制保存
或者修改文件權限
chmod -v u+w /etc/sudoers
配置完了，最好把權限收回
chmod -v u-w /etc/sudoers
到這里基本結束了。
可以用新用戶登陸了，使用sudo命令這塊
[hadoop@centos ~]$ sudo cat /etc/passwd We trust you have received the usual lecture from the local System Administrator. It usually boils down to these three things: #1) Respect the privacy of others. #2) Think before you type. #3) With great power comes great responsibility. [sudo] password for hadoop: