虚拟机安装CentOS6.3两个问题

虚拟机下CentOS安装教程：http://blog.csdn.net/21aspnet/article/details/6961518

由于前一阵子重新装win7，win7下的虚拟机CentOS也就没有，重装中遇到两个主要问题，记录一下。

1，连接secureCRT问题：

1）切换到root下，ntsysv打开sshd服务，关闭防火墙ip6tables， iptables

2）配置网卡，保证虚拟机能够上网

[centos@localhost ~]$ ifconfig 
eth0      Link encap:Ethernet  HWaddr 00:0C:29:83:DE:5E  
          inet addr:192.168.1.96  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe83:de5e/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1256 errors:0 dropped:0 overruns:0 frame:0
          TX packets:413 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:105296 (102.8 KiB)  TX bytes:101337 (98.9 KiB)
          Interrupt:19 Base address:0x2000 


lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:16 errors:0 dropped:0 overruns:0 frame:0
          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1080 (1.0 KiB)  TX bytes:1080 (1.0 KiB)

2，创建用户，添加sudo权限，取消每次sudo输入密码，这里已经创建centos用户。

[centos@localhost ~]$ su root
Password: 
[root@localhost centos]# ll /etc/sudoers
-r--r-----. 1 root root 4080 Aug 11 22:47 /etc/sudoers
[root@localhost centos]# chmod +w /etc/sudoers  //修改文件加上w权限，才能够改写
[root@localhost centos]# vim /etc/sudoers

。。。。。。

## The COMMANDS section may have other options added to it.
##
## Allow root to run any commands anywhere 
root    ALL=(ALL)       ALL
centos All=(ALL)       ALL


## Allows members of the 'sys' group to run networking, software, 
## service management apps and more.
# %sys ALL = NETWORKING, SOFTWARE, SERVICES, STORAGE, DELEGATING, PROCESSES, LOCATE, DRIVERS


## Allows people in group wheel to run all commands
# %wheel        ALL=(ALL)       ALL


## Same thing without a password
# %wheel        ALL=(ALL)       NOPASSWD: ALL
%centos  ALL=(ALL) NOPASSWD: NOPASSWD: ALL

。。。。。。

[root@localhost centos]#chmod -w /etc/sudoers //此文件权限-r--r-----，修改之后需要改回，否则将无法执行sudo

[root@localhost centos]# ll /etc/sudoers

-r--r-----. 1 root root 4080 Aug 11 22:47 /etc/sudoers

[root@localhost centos]# exit
exit
[centos@localhost ~]$ sudo ls
mywork
[centos@localhost ~]$ OK