Difference between revisions of "Displaying Ubuntu Linux Applications Remotely (X11 Forwarding)"
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Latest revision as of 19:58, 27 October 2016
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You are reading a sample chapter from the Ubuntu 11.04 Essentials book. Purchase the fully updated Ubuntu 20.04 Essentials book in eBook ($9.99) or Print ($36.99) format Ubuntu 20.04 Essentials Print and eBook (ePub/PDF/Kindle) edition contains 36 chapters and over 310 pages
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In the previous chapter (Remote Access to the Ubuntu Linux Desktop) we looked at how to display the entire Ubuntu Linux desktop on a remote computer. Whilst this works well if you actually need to remotely display the entire desktop, it could be considered overkill if all you want to do is display a single application. In this chapter we will look at displaying individual applications on a remote system.
Requirements for Remotely Displaying Applications
Secondly, the system on which the application is being run (as opposed to the system which the application is to be displayed) must be configured to allow SSH access. Details on configuring SSH on an Ubuntu Linux system can be found in the chapter entitled Configuring Ubuntu Linux Remote Access using SSH. Finally, SSH must be configured to allow X11 Forwarding. To verify this, load the /etc/ssh/ssh_config file into an editor and make sure that the following directive is set:
X11Forward yes
Once the above requirements are met it is time to remotely display an application.
Remotely Displaying an Ubuntu Linux Application
The first step in remotely displaying an application is to move to the system where the application is to be displayed. At this system, ssh into the remote system so that you have a command prompt. This can be achieved using the ssh command. When using the ssh command we need to use the -X flag to tell ssh that we plan to tunnel X traffic through the tunnel:
ssh -X user@hostname
where username is the user name to use to log into the remote system and hostname is the hostname or IP address of the remote system. Enter your password at the login prompt. Once logged in, run the following command to see the DISPLAY setting:
echo $DISPLAY
The command should output something similar to the following:
localhost:10.0
To display an application simply run it from the command prompt. For example:
xclock
When run, the above command should run the xclock utility on the remote system, but display the output on the local system:
xclock&
Trusted X11 Forwarding
If the /etc/ssh/ssh_config file on the remote system contains the following line, then it is possible to use trusted X11 forwarding:
ForwardX11Trusted yes
Trusted X11 forwarding is slightly faster than untrusted since it does not engage the X11 security controls. The -Y flag is needed when using trusted X11 forwarding:
ssh -Y user@hostname
Compressed X11 Forwarding
When using slower links the X11 data can be compressed using the -C flag:
ssh -X -C user@hostname
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You are reading a sample chapter from the Ubuntu 11.04 Essentials book. Purchase the fully updated Ubuntu 20.04 Essentials book in eBook ($9.99) or Print ($36.99) format Ubuntu 20.04 Essentials Print and eBook (ePub/PDF/Kindle) edition contains 36 chapters and over 310 pages
|
