other:x_conf
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other:x_conf [2022/08/09 15:46] jypeter [What is an X server?] Note about DISPLAY, and foreword |
other:x_conf [2022/08/11 07:59] jypeter [On a Linux computer] Renamed to 'On a Linux computer or a Mac' |
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| * The **remote computer or server** is another computer that you also want to interact with (using the screen+mouse+keyboard of your local computer) | * The **remote computer or server** is another computer that you also want to interact with (using the screen+mouse+keyboard of your local computer) | ||
| + | * [[other:ssh#connecting_to_servers_commonly_used_by_lsce_users|Some servers used by LSCE users]] | ||
| * We only consider on this page the case of a **remote //Linux// machine** that **requires a local running //X server//** | * We only consider on this page the case of a **remote //Linux// machine** that **requires a local running //X server//** | ||
| Line 132: | Line 133: | ||
| The idea is to: | The idea is to: | ||
| - | * Open a terminal and check that the ''DISPLAY'' environment variable is correctly defined on the local machine | + | * Open a terminal and check that the ''DISPLAY'' environment variable is defined on the local machine |
| * If we use [[other:win10wsl|WSL]], we also check that we can start an application using graphics in ''WSL'' | * If we use [[other:win10wsl|WSL]], we also check that we can start an application using graphics in ''WSL'' | ||
| * Connect to the remote machine | * Connect to the remote machine | ||
| Line 147: | Line 148: | ||
| The test may fail, due to the [[other:x_conf#nothing_works|usually expected errors]] | The test may fail, due to the [[other:x_conf#nothing_works|usually expected errors]] | ||
| - | ==== On a Linux computer ==== | + | ==== On a Linux computer or a Mac ==== |
| - | Some basic commands in a terminal | + | Open a //terminal// ([[other:ssh#a_recommended_terminal_for_mac|terminal on a Mac]]) and use some basic commands to check things |
| <code>[Local] $ hostname | <code>[Local] $ hostname | ||
| Line 228: | Line 229: | ||
| [Remote] $ xterm &</code> | [Remote] $ xterm &</code> | ||
| + | |||
| ==== On a Mac ==== | ==== On a Mac ==== | ||
| FIXME | FIXME | ||
| + | |||
| + | |||
| ===== Troubleshooting ===== | ===== Troubleshooting ===== | ||
| + | |||
| ==== Nothing works! ==== | ==== Nothing works! ==== | ||
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| * Is the [[other:x_conf#what_is_an_x_server|DISPLAY variable]] defined correctly on the local and remote computer? | * Is the [[other:x_conf#what_is_an_x_server|DISPLAY variable]] defined correctly on the local and remote computer? | ||
| - | === When DISPLAY is not defined correctly === | + | |
| + | ==== Error when there is no X server running ==== | ||
| + | |||
| + | If the ''DISPLAY'' variable is defined, but there is **no X server**, you will get a ''Can't open display: localhost://[SOME VALUE]//'' error\\ <code>$ xterm & | ||
| + | xterm: Xt error: Can't open display: localhost:23.0</code> | ||
| + | |||
| + | Time to [[other:x_conf|read this page again]]... | ||
| + | |||
| + | |||
| + | ==== Error when DISPLAY is not defined correctly ==== | ||
| If the ''DISPLAY'' **variable is not defined (correctly)**, you will get a ''Can't open display: //[NO VALUE DISPLAYED HERE]//'' error | If the ''DISPLAY'' **variable is not defined (correctly)**, you will get a ''Can't open display: //[NO VALUE DISPLAYED HERE]//'' error | ||
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| Make sure that you are using ''ssh -X'' or ''ssh -Y'', or that [[other:putty_conf#changing_some_useful_settings|PuTTY is configured]] with ''Enable X11 forwarding'' | Make sure that you are using ''ssh -X'' or ''ssh -Y'', or that [[other:putty_conf#changing_some_useful_settings|PuTTY is configured]] with ''Enable X11 forwarding'' | ||
| - | === When there is no X server running === | ||
| - | If the ''DISPLAY'' variable is defined, but there is **no X server**, you will get a ''Can't open display: localhost://[SOME VALUE]//'' error\\ <code>$ xterm & | + | ==== Can't start a graphical application by clicking on its desktop shortcut ==== |
| - | xterm: Xt error: Can't open display: localhost:23.0</code> | + | |
| + | Check the shortcut and run the command directly in a terminal to check the error message | ||
| + | |||
| + | There is a good chance that [[other:x_conf#error_when_there_is_no_x_server_running|you have forgotten to start the X server!]] | ||
| - | Time to [[other:x_conf|read this page again]]... | ||
| ==== OpenGL related settings ==== | ==== OpenGL related settings ==== | ||
other/x_conf.txt · Last modified: 2023/06/30 08:20 by jypeter
