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WebVNC (view source)

Revision as of 15:37, 5 April 2014

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{{NeedsUpdate}} The [[WebVNC]] package is for easily setting application sets up a web-page that let's readers to access a Java applet for VNC connections. VNC is, simply put, graphical remote control desktop software. With VNC allows you to connect to a desktop on the the Amahi server from a remote computer via a browser. You must have a desktop session open on your HDA to be able to open a WebVNC session. To establish remote desktop connectivity on a Fedora-based Amahi install, it takes a few steps two elements are required: #installation of the WebVNC application on the Amahi server to 1) install and #installation of a VNC client on the package, 2) turn on desktop sharingremote computer.
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'''Note: The procedure below allows anyone in your network to access this machine to connect to a desktop on your session, Amahi server if they know the password. Be sure this is what you want.'''
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== Install the WebVNC Package == * Goto http://setup* Select the applications tab* Click on WebVNC* Click the install icon to install it on your HDA
'''NOTE# Go to http:''' a very common issue is that ''you must have a desktop session open'' //setup# Select the Apps tab# Select the Available option# Click on your HDA WebVNC# Click the install icon to be able to open a install the WebVNC session. If you have a headless server package on your HDA server, see below.
That should '''NOTE:''' ''You must have a desktop session open'' on your HDA to be all able to open a WebVNC session. If you need to do for the web application setup!have a headless HDA server, see below.
==Setup VNC Server==
Sorry, some manual work needed to run the server
* Log into the computer running HDA, e.g. as a normal user
* Edit the file /etc/sysconfig/vncservers (with your favorite text editor)
Set the lines starting with VNCSERVER to read (remove the # at the start of the line)
 
<small>
VNCSERVERS="1:''yourusername''"
VNCSERVERARGS[1]="-geometry 1024x768 -depth 16"
</small>
 
where ''yourusername'' is the desktop user you use to access your HDA desktop.
 
[[VNC|Click Here]] more details on setting up VNC on your HDA.
Sorry, some manual work is needed to run the server:
1. Log into the computer running the HDA as a normal user
2. Launch a command line/terminal session (From the GNOME desktop, select Applications > System Tools > Terminal)
3. Login as super user:<br />
su -
:password: ''enter root password''<br /><br />
4. Change the permissions of /etc/sysconfig/vncservers to allow editing with the following command:<br />
chmod 777 /etc/sysconfig/vncservers
5. Open the file /etc/sysconfig/vncservers with a text editor (Applications > Accessories > gedit Text Editor on the GNOME desktop) and add the following two lines to the bottom of the file:<br />
VNCSERVERS="0:''yourusername''"
VNCSERVERARGS[0]="-geometry 1024x768 -depth 16"
'''NOTE:''' ''yourusername'' is the desktop user you use to login to your HDA desktop. Make sure there is no # comment symbol in front of your entries. This entry will create a 1024 x 768 desktop with 16M colors on your remote machine.<br /><br />
You can set the desktop resolution to any value you want -- see below. You can also setup sessions for multiple users and computers. More detailed instructions are available [http://www.g-loaded.eu/2005/11/10/configure-vnc-server-in-fedora/ here].<br /><br />
6. Change the file permissions back:<br />
chmod 244 /etc/sysconfig/vncservers
== Turn on Desktop Sharing ==
Unless you do this, your VNC session or your desktop will have a message asking someone to accept or refuse connections, and your client will be stuck waiting!
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* # Log into your desktop on the HDA computer running HDA, e.g. as a normal user* # Select SYSTEM menu, then System > Preferences, then Internet and Network, then > Remote Desktop* # Turn on the top two "sharing" options, turn off the "Ask for confirmation" option, but set a password below it, turn on "Configure Network automatically to accept connections."
::[[File:Remote_Desktop_Preferences.PNG]] '''NoteNOTE: ''' This allows anyone with network access to this machine to connect to your session, if they know the password. Be sure this is what you want.'''
== Using the App ==
You should now be able to access: [http://webvnc http://webvnc]. Give it a minute to start up, then enter your password.
Note'''Reminder: ''' You must have a desktop session started on your HDA for WebVNC to display. * Leave any questions or discussion on the [[Talk:WebVNC]] page. == Quickly Change Resolution ==You can create a script to quickly change the resolution of your HDA''' s desktop and update your WebVNC window. This technique involves keeping several different configuration files for your WebVNC and adjusting a symlink to reference the correct configuration. First, as root, make a copy of your WebVNC webpage configuration in your user folder for EACH desired resolution, with the following commands:  cd /var/hda/web-apps/webvnc/html cp index.html /home/%USER%/.amahi.webvnc.800x600.index.html cp index.html /home/%USER%/.amahi.webvnc.1024x768.index.html cp index.html /home/%USER%/.amahi.webvnc.1280x1024.index.html
Leave any questions or discussion on You will need to edit each of these files to change the [[Talksize of the VNC window inside the web page. The width of the window should match the width of your desktop, however the height of the window should have 22px added to the height of the desktop in order to account for the WebVNC menu. For example, for the resolution 800x600, the html file will look like this: &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"&gt;&gt; &lt;head&gt; &lt;title&gt;WebVNC]] pageClient&lt;/title&gt; &lt;meta http-equiv="Content-Language" content="en-us" /&gt; &lt;meta http-equiv="Content-Type" content="text/html;charset=UTF-8" /&gt; &lt;head&gt; &lt;body style="font-size:8px;background-color:#000000;font-family:arial, helvetica, sans-serif;font-color:#007500;text-align:center;"&gt; &lt;div style="position:relative;margin: 0 auto;width:800px;height:622px;"&gt; &lt;applet code=VncViewer.class codebase=classes/ width="800" height="622"&gt; &lt;param name=PORT value=5900&gt; &lt;param name="Open New Window" value="no"&gt; &lt;/applet&gt;&lt;br /&gt; &lt;/div&gt; &lt;a href="http://hda/"&gt;Return to HDA Home&lt;/a&gt; &lt;/body&gt; &lt;/html&gt;
Screenshot of desktop sharing setup below Next, remove the original index.html file and create a symlink to the appropriate new file: rm index.html ln - sorry it's so huge/home/%USER%/.amahi.webvnc.800x600.index.html index.html
http://content.screencastNow you need a script in order to change the resolution of the desktop AND update the symlink to the correct configuration.com Create a file in /usershome/spatialguru%USER%/foldersScripts/Jing/media/996c7c1d-05a9-4a92-9d87-f89167742a3c/00000032for each desired resolution, for example, amahi.webvnc.reschange.800x600.pngsh containing the following, making sure to enter your sudo password and the desired resolution:
== Troubleshooting == #!/bin/bashA very basic issue echo ::password:: | sudo -S rm - '''you must have a desktop session open''' on your HDA to be able to open a WebVNC sessionf /var/hda/web-apps/webvnc/html/index.html sudo ln -s /home/%USER%/.amahi.webvnc.800x600.index.html /var/hda/web-apps/webvnc/html/index.html sudo xrandr -s 800x600
Two typical scenarios pop up as problematic. OneFinally, is to make sure you have a password defined as above. Second, make sure the confirmation checkbox is deactivatedeach of your scripts executable (chmod u+x %SCRIPT%), unless you are sitting in front of the HDA itself. Otherwise it will just sit there indefinitely waiting for someone to click place a button drawer on the screen your panel with a launcher to each of the HDAyour scripts, then to change resolutions select your launcher and refresh your WebVNC window.
Please note that at the present time, and according to the above, only port 5900 (VNC display == Troubleshooting ==*A very basic issue:0) is supported. If '''you want must have a desktop session open''' on your HDA to change that, then manually edit /var/hda/web-apps/webvnc/html/index.html and change 5900 be able to desired number (e.g. :1 = 5901, :2=5902, etc)open a WebVNC session.
If when trying to connect with WebVNC * Make sure you get have a message on the Amahi box "Enter password for default keyring to unlock" then you need to delete or rename the default keyring:defined as above.
To delete:* Ensure the confirmation checkbox is deactivated, unless you are sitting in front of the HDA itself. Otherwise it will just sit there indefinitely waiting for someone to click a button on the screen of the HDA.
* Please note that at the present time, and according to the above, only port 5900 (VNC display :0) is supported. rm ~If you want to change that, then manually edit /var/hda/web-apps/.gnome2webvnc/keyringshtml/defaultindex.html and change 5900 to desired number (e.g. :1 = 5901, :2=5902, etc).keyring
* If when trying to connect with WebVNC you get a message on the Amahi box "Enter password for default keyring to unlock" then you need to delete or backuprename the default keyring:
:To delete:
~/.gnome2/keyrings/default.keyring
:or backup:
mv ~/.gnome2/keyrings/default.keyring ~/.gnome2/keyrings/default.keyring.bak
== Headless Servers ==
If your HDA server is headless, then WebVNC is not for you (because you will not have a desktop session running). Instead, install a VNC client on your remote computer and [[VNC tigervnc-server|VNC Server]] on the HDA.   There is however a hack to allow you to run WebVNC from a headless server. This is rather complex, and will not allow you to boot with a monitor attached without changing files again.  You need to modify you xorg.conf to emulation a monitor.  cd /etc/X11/ nano xorg.conf:save it as xorg.conf.bak nano xorg.conf:replace everything with  Section "Monitor" Identifier "Monitor0" HorizSync 31-81 VertRefresh 56-75 EndSection Section "Device" Identifier "Card0" Driver "vesa" EndSection Section "Screen" Identifier "Screen0" Device "Card0" Monitor "Monitor0" EndSection :save and close xorg.conf  nano /boot/grub/grub.conf:save it as grub.conf.bak nano /boot/grub/grub.conf:add above title Fedora GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset" Reboot If you ever want to use a monitor, you just need to restore the .bak files.
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