centos 开启VNC

安装软件包（有yum源安装的，不采用源码安装）

yum -y install vnc vnc-server

安装成功后，配置如下：

[root@localhost ~]# vncserver
#设置 VNC密码，输入：（在某用户下输入则登陆用户就是它，如果su imiss切换到imiss用户，输入vncserver则启动的是另一个桌面，同样要设置密码，以后在该账户下启动的vncserver登陆就需要在此用户下设置的密码了。）
You will require a password to access your desktops.

Password:
Password must be at least  characters - try again
Password:
Verify:
xauth:  creating new authority file /root/.Xauthority

New 'localhost.localdomain:1 (root)' desktop is localhost.localdomain:

Creating default startup script /root/.vnc/xstartup
Starting applications specified in /root/.vnc/xstartup
Log file is /root/.vnc/localhost.localdomain:.log

[root@localhost ~]# vncpasswd
Password:
Password must be at least  characters - try again
Password:
Verify:
[root@localhost ~]# 

修改配置文件：

vim ~/.vnc/xstartup （最后两行）

#xterm -geometry 80x24++ -ls -title "$VNCDESKTOP Desktop" &
#twm &
gnome-session &

vim  /etc/sysconfig/vncservers  （最后两行）

# VNCSERVERS="2:myusername"
# VNCSERVERARGS[]="-geometry 800x600 -nolisten tcp -localhost"
 VNCSERVERS="1:root"
 VNCSERVERARGS[]="-geometry 800x600"

vi /etc/sysconfig/iptables （配置防火墙）

-A INPUT -m state --state NEW -m tcp -p tcp --dport  -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport  -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport  -j ACCEPT
#VNC server 监听的端口从 5900 开始，display:1 的监听 5901，display:2 监听 5902，以此类推。CentOS 的防火墙缺省是不允许连接这些端口的，所以需要使用下面的步骤打开防火墙（需要 root 权限)：

[root@localhost ~]# service iptables restart
iptables: Setting chains to policy ACCEPT: nat mangle filte[  OK  ]
iptables: Flushing firewall rules:                         [  OK  ]
iptables: Unloading modules:                               [  OK  ]
iptables: Applying firewall rules:                         [  OK  ]

启动服务

[root@localhost ~]# chkconfig vncserver on
[root@localhost ~]# service vncserver start
Starting VNC server: :root
New 'localhost.localdomain:2 (root)' desktop is localhost.localdomain:

Starting applications specified in /root/.vnc/xstartup
Log file is /root/.vnc/localhost.localdomain:.log

                                                           [  OK  ]
[root@localhost ~]#

关闭vnc

vncserver -kill :
#注意kill后面要有一个空格

连接