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VNC介紹及相關命令總結

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What is VNCserver?

VNC stands for Virtual Network Computing. It was originally developed by AT&T as a way to administer machines without using the console. If you have used Windows Terminal Services (RDP) , VNC will seem very familiar.

Why use VNCserver?

In Linux, everything can be done from a shell . However, there may be a time when you need to access the machine as if you were at the console.

Getting Started

You will need several things to get started:
  • root privledges
  • VNC client software (tightVNC, you can download it here .)
  • A good password!
As I mentioned above, this example is done with RHEL, which comes standard with VNCserver installed. To start the vncserver simply invoke the following commands:
      [root@roswell etc]# service vncserver start
Starting VNC server:                                       [  OK  ]
[root@roswell etc]# 
[root@roswell etc]# vncpasswd
Password: 
Verify: 
[root@roswell etc]#
[root@roswell etc]# vncserver

New 'roswell:1 (root)' desktop is roswell:1

Starting applications specified in /root/.vnc/xstartup
Log file is /root/.vnc/roswell:1.log

[root@roswell etc]# 

    


So what did we do there? First, we started the vncserver service. It may or may not have already been running on your system. Next we set a password to access the VNC desktop. When you set the password, you will not see any characters on the screen, and you must enter the password twice. You will only need to do this the very first time you run vncserver. The password will be saved in the Linux filesystem, and you can change it at any time by invoking the vncpasswd command again. Last, to activate the VNC desktop, we simply invoked the vncserver command. Notice the output; the desktop is named "roswell:1" which can also be replaced via the machines IP address.

Connecting

Assuming you already installed TightVNC or another VNC client, enter the desktop name:



You can replace the server name with an IP address if you are logging in from outside your LAN. Remember, if you are using NAT port 5900 must be forwarded to your VNCserver.

VNC介紹及相關命令總結

Upon successful connection, you will be prompted for a password. You will then see a terminal screen that will allow you to execute commands:

VNC介紹及相關命令總結

VNCserver in Runlevel 5 (KDE or Gnome)

If you are new to linux, running VNC server with a terminal isn't going to do you much good. You might want to have a menu-driven GUI like Windows. No problem. Follow these steps:


First, we are going to assume that VNCserver is running under the root user, as shown with the example above. For this example, I will be editing my VNCserver to enter Gnome. You can specify a KDE desktop if you have KDE installed on your server. Make sure you are in the root directory.
      [root@roswell ~]# ls -a
.                                   cacti-0.8.6c.tar.gz  .gnome2_private     .lftp                  queue.dat          temp
..                                  client.cfg           .gnupg              machinedependent.dat  .recently-used      Templates
.config                             FAHlog-Prev.txt      .gstreamer-0.8      .metacity             .rhn-applet.cache  .themes
.cshrc                              FAHlog.txt           .gtkrc              .mozilla              .rhn-applet.conf   .thumbnails
.bash_history                       Desktop              .fonts.cache-1      .gtkrc-1.2-gnome2     .rnd               .Trash
.bash_logout                        .dmrc                .gconf              .ICEauthority         .mysql_history      scripts
.bash_profile                       .eggcups             .gconfd             .icons                .nautilus          .sh_history
.viminfo                            .bashrc              .bashdevl           .esd_auth             .gnome              php-4.11
.ssh                                .vnc                  cacti-0.8.6c       .gnome2                install.log
[root@roswell ~]# cd .vnc
[root@roswell .vnc]# ls
passwd         roswell:1.pid  roswell:2.pid  roswell:3.pid  roswell:4.pid  roswell:5.pid             roswell.area51.lan:1.pid
roswell:1.log  roswell:2.log  roswell:3.log  roswell:4.log  roswell:5.log  roswell.area51.lan:1.log  roswell.area51.lan:2.log
xstartup
[root@roswell .vnc]# vi xstartup

    


Using vi (vim) to edit the xstartup file, make sure your file matches this one:


      #!/bin/sh

# Uncomment the following two lines for normal desktop:
 unset SESSION_MANAGER
 exec /etc/X11/xinit/xinitrc

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -iconic &
xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
startx &

    


Notice that the last line is "startx &" as this command will launch Gnome upon login via VNCserver. If you are using a KDE desktop, the line "startkde &" should replace the last line.

VNC相關命令:vncconfig <wbr>vncpasswd <wbr>vncserver<wbr>vncviewer<br><br><span>1.檢查vnc客戶端(tscleint/vncviewer)和服務器是否已經安裝在你的系統中</span><br><span># rpm -qa|grep vnc</span><br><span>vnc-4.1.2-14.el5_3.1</span><br><span>vnc-server-4.1.2-14.el5_3.1</span><br><span>如果沒有安裝vncviewer,那么運行:</span><br><span># yum install vnc</span><br><span>客戶端我們也可以使用tscleint。</span><br><br><span>2.配置vncserver</span><br><span>vim /etc/sysconfig/vncservers</span><br><span>增加:VNCSERVERS="1:root"</span><br><br><span>3.vncpasswd創建一個vnc的口令</span><br><span>注意這將同時在你的home目錄下,創建一個隱藏的目錄.vnc,其中有一個文件passwd保存著你的vnc口令.</span><br><br><span>4. #service vncserver start</span><br><br><span>5. # vncserver</span> (第一次啟動時,需要指定一個密碼)<br><span>You will require a password to access your desktops.</span><br><span>Password:</span><br><span>Verify:</span><br><span>New 'lpi:1 (root)' desktop is lpi:1</span><br><span>Creating default startup script /root/.vnc/xstartup</span><br><span>Starting applications specified in /root/.vnc/xstartup</span><br><span>Log file is /root/.vnc/lpi:1.log</span><br><br><span>可以以多個用戶身份,啟動多個VNC,共享多個用戶的桌面:</span><br><span># lsof -i:{5901,5904}</span><br><span>COMMAND <wbr>PID USER <wbr><wbr>FD <wbr><wbr>TYPE DEVICE SIZE NODE NAME</wbr></wbr></wbr></wbr></wbr></span><br><span>Xvnc <wbr><wbr><wbr>2373 root <wbr><wbr><wbr>4u <wbr>IPv4 <wbr><wbr>6975 <wbr><wbr><wbr><wbr><wbr><wbr>TCP *:5901 (LISTEN)</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><br><span>Xvnc <wbr><wbr><wbr>4236 test <wbr><wbr><wbr>4u <wbr>IPv4 <wbr>16231 <wbr><wbr><wbr><wbr><wbr><wbr>TCP *:5904 (LISTEN)</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><br><br><span>可以手工指定display#,例如:</span><br><span># vncserver :99</span><br><span>New 'lpi.123.com:99 (root)' desktop is server01.123.com:99</span><br><span>Starting applications specified in /root/.vnc/xstartup</span><br><span>Log file is /root/.vnc/server01.123.com:99.log</span><br><br><span>6.停止 vncserver(vncserver -kill :display#): <wbr></wbr></span><br><span># vncserver -kill :1</span><br><span>Killing Xvnc process ID 2373</span><br><br><span>7.設置自動運行:ntsysv</span><br><br><span>8.VNC給瀏覽器的端口是5800+N,給vncviewer的端口是5900+N,N是設置的display號</span><br><span>http://192.168.1.1:5801/</span><br><span>ultravnc:192.168.1.1:5901</span><br><span># lsof -i:5801,5901</span><br><span>COMMAND <wbr><wbr>PID USER <wbr><wbr>FD <wbr><wbr>TYPE DEVICE SIZE NODE NAME</wbr></wbr></wbr></wbr></wbr></wbr></span><br><span>Xvnc <wbr><wbr><wbr>31742 root <wbr><wbr><wbr>4u <wbr>IPv4 <wbr>51969 <wbr><wbr><wbr><wbr><wbr><wbr>TCP *:5901 (LISTEN)</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><br><span>Xvnc <wbr><wbr><wbr>31742 root <wbr><wbr><wbr>5u <wbr>IPv4 <wbr>51970 <wbr><wbr><wbr><wbr><wbr><wbr>TCP *:5801 (LISTEN)</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><br><br><span>9.修改VNC密碼</span><br><span># vncpasswd /root/.vnc/passwd</span><br><span>Password:</span><br><span>Verify:</span><br><br><span>VNC日志文件位于:$HOME/.vnc下的log文件,此目錄也包含了一個VNC的xstartup啟動文件。</span><br><br><span style="font-weight:bold">以GNOME方式顯示,修改xstartup文件</span><br><span style="color:#033cc">#!/bin/sh</span><br style="color:rgb(0,51,204)"><br style="color:rgb(0,51,204)"><span style="color:#033cc"># Uncomment the following two lines for normal desktop:</span><br style="color:rgb(0,51,204)"><span style="color:#033cc">unset SESSION_MANAGER</span><br style="color:rgb(0,51,204)"><span style="color:#033cc">exec /etc/X11/xinit/xinitrc</span><br style="color:rgb(0,51,204)"><br style="color:rgb(0,51,204)"><span style="color:#033cc">[ -x /etc/vnc/xstartup ] &amp;&amp; exec /etc/vnc/xstartup</span><br style="color:rgb(0,51,204)"><span style="color:#033cc">[ -r $HOME/.Xresources ] &amp;&amp; xrdb $HOME/.Xresources</span><br style="color:rgb(0,51,204)"><span style="color:#033cc">xsetroot -solid grey</span><br style="color:rgb(0,51,204)"><span style="color:#033cc">vncconfig -iconic &amp;</span><br style="color:rgb(0,51,204)"><span style="color:#033cc">xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &amp;</span><br style="color:rgb(0,51,204)"><span style="color:#033cc">gnome-session &amp;</span><br><span># tsclient</span><br><span>出現錯誤:unable to connect to host: Connection refused (111)</span><br><span>一般是沒有指定連接的display#,例如地址輸入:192.168.1.1出錯,192.168.1.1:1就正確了<br> VNCserver auto run<br></span><span style="background-color:#ffff00"><span>啟動vncserver服務時,出現no displays configured :此錯誤,請編輯vncservers文件</span><br><span>#vim /etc/sysconfig/vncservers</span><br><span style="color:#033cc"># The VNCSERVERS variable is a list of display:user pairs.</span><br style="color:rgb(0,51,204)"><span style="color:#033cc">#</span><br style="color:rgb(0,51,204)"><span style="color:#033cc"># Uncomment the lines below to start a VNC server on display :2</span><br style="color:rgb(0,51,204)"><span style="color:#033cc"># as my 'myusername' (adjust this to your own). <wbr>You will also</wbr></span><br style="color:rgb(0,51,204)"><span style="color:#033cc"># need to set a VNC password; run 'man vncpasswd' to see how</span><br style="color:rgb(0,51,204)"><span style="color:#033cc"># to do that. <wbr></wbr></span><br style="color:rgb(0,51,204)"><span style="color:#033cc">#</span><br style="color:rgb(0,51,204)"><span style="color:#033cc"># DO NOT RUN THIS SERVICE if your local area network is</span><br style="color:rgb(0,51,204)"><span style="color:#033cc"># untrusted! <wbr>For a secure way of using VNC, see</wbr></span><br style="color:rgb(0,51,204)"><span style="color:#033cc"># &lt;URL:http://www.uk.research.att.com/archive/vnc/sshvnc.html&gt;.</span><br style="color:rgb(0,51,204)"><br style="color:rgb(0,51,204)"><span style="color:#033cc"># Use "-nolisten tcp" to prevent X connections to your VNC server via TCP.</span><br style="color:rgb(0,51,204)"><br style="color:rgb(0,51,204)"><span style="color:#033cc"># Use "-nohttpd" to prevent web-based VNC clients connecting.</span><br style="color:rgb(0,51,204)"><br style="color:rgb(0,51,204)"><span style="color:#033cc"># Use "-localhost" to prevent remote VNC clients connecting except when</span><br style="color:rgb(0,51,204)"><span style="color:#033cc"># doing so through a secure tunnel. <wbr>See the "-via" option in the</wbr></span><br style="color:rgb(0,51,204)"><span style="color:#033cc"># `man vncviewer' manual page.</span><br style="color:rgb(0,51,204)"><br style="color:rgb(0,51,204)"><span style="color:#033cc">VNCSERVERS="1:root"</span><br style="color:rgb(0,51,204)"><span style="color:#033cc">VNCSERVERARGS[2]="-geometry 800x600 -nolisten tcp -nohttpd -localhost"</span></span></wbr></wbr></wbr>

VNC介紹及相關命令總結


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