Re: xenodm + Xvfb + x11vnc = virtual display for vmm(4) OpenBSD guests
On Tue, Jul 18, 2023 at 5:42 PM Morgan Aldridge wrote: > > On On 2023-07-18, Stuart Henderson wrote: > > On 2023-07-18, Morgan Aldridge wrote: > > > I'm maintaining an OpenBSD X11 window manager (WM) port, but try to > > > keep my primary workstation on -stable, so do most of my development > > > there and test in Xephyr. I test & submit patches from an OpenBSD > > > -current VM running under vmm(4), but since vmm(4) doesn't emulate > > > video hardware, I haven't been run-testing there. > > > > > > I'm already comfortable with x11vnc under OpenBSD, plus Xephyr, but > > > they both use an existing X display. After studying xenodm(1), > > > Xvfb(1), x11vnc(1), and a bunch of other X(1)-related manual pages, > > > plus tons of experimenting, the solution was actually quite simple. > > > > > > TL; DR > > > > > > I could find much on the Internet, list archives, etc., regarding this > > > specific situation, so here's my solution for a [slow] X11 virtual > > > display on a vmm(4) OpenBSD guest, accessible via VNC over an SSH > > > tunnel: > > > > > > doas rcctl enable xenodm > > > doas rcctl set xenodm flags \ > > > "-server ':0 local /usr/X11R6/bin/Xvfb :0 -screen 1024x768x24 -shmem'" > > > doas rcctl start xenodm > > > doas pkg_add x11vnc > > > doas rcctl enable x11vnc > > > doas rcctl start x11vnc > > > > > > Hope someone else finds this useful down the road, > > > > I recommend putting x11vnc in the bin and using tigervnc if it works for > > your configuration... > > Thanks! TigerVNC's x0vncserver(1) seems to work similarly to x11vnc(1)'s > default rc.d flags when executed as follows: > > x0vncserver -SecurityTypes None -localhost > > This doesn't require a password (WARNING!), but does require an SSH > tunnel to access. Is certainly snappier too! > > Easy enough to copy /etc/rc.d/x11vnc (before uninstalling) and update > the 'daemon' & 'daemon_flags' values as follows: > > daemon="/usr/local/bin/x0vncserver" > daemon_flags="-SecurityTypes None -localhost" > > I'm pretty sure 'rc_bg=YES' & 'rc_reload=NO' would need to be retained. Oops, x0vncserver doesn't automatically find the appropriate .Xauthority like x11vnc's `-auth guess` does, so while it works when run as your user and already logged in via xenodm, it doesn't actually work correctly from rc.d as I suggested above. I'll investigate and do some further testing, but the nice thing about x11vnc is that it handles the xenodm login window, plus logging in and out as various users. Naturally, this is convenient for window manager & desktop environment testing. Morgan
Re: xenodm + Xvfb + x11vnc = virtual display for vmm(4) OpenBSD guests
On On 2023-07-18, Stuart Henderson wrote: > On 2023-07-18, Morgan Aldridge wrote: > > I'm maintaining an OpenBSD X11 window manager (WM) port, but try to > > keep my primary workstation on -stable, so do most of my development > > there and test in Xephyr. I test & submit patches from an OpenBSD > > -current VM running under vmm(4), but since vmm(4) doesn't emulate > > video hardware, I haven't been run-testing there. > > > > I'm already comfortable with x11vnc under OpenBSD, plus Xephyr, but > > they both use an existing X display. After studying xenodm(1), > > Xvfb(1), x11vnc(1), and a bunch of other X(1)-related manual pages, > > plus tons of experimenting, the solution was actually quite simple. > > > > TL; DR > > > > I could find much on the Internet, list archives, etc., regarding this > > specific situation, so here's my solution for a [slow] X11 virtual > > display on a vmm(4) OpenBSD guest, accessible via VNC over an SSH > > tunnel: > > > > doas rcctl enable xenodm > > doas rcctl set xenodm flags \ > > "-server ':0 local /usr/X11R6/bin/Xvfb :0 -screen 1024x768x24 -shmem'" > > doas rcctl start xenodm > > doas pkg_add x11vnc > > doas rcctl enable x11vnc > > doas rcctl start x11vnc > > > > Hope someone else finds this useful down the road, > > I recommend putting x11vnc in the bin and using tigervnc if it works for > your configuration... Thanks! TigerVNC's x0vncserver(1) seems to work similarly to x11vnc(1)'s default rc.d flags when executed as follows: x0vncserver -SecurityTypes None -localhost This doesn't require a password (WARNING!), but does require an SSH tunnel to access. Is certainly snappier too! Easy enough to copy /etc/rc.d/x11vnc (before uninstalling) and update the 'daemon' & 'daemon_flags' values as follows: daemon="/usr/local/bin/x0vncserver" daemon_flags="-SecurityTypes None -localhost" I'm pretty sure 'rc_bg=YES' & 'rc_reload=NO' would need to be retained. Morgan
Re: xenodm + Xvfb + x11vnc = virtual display for vmm(4) OpenBSD guests
Thanks, will test. Will be useful. On 7/18/23 20:09, Morgan Aldridge wrote: I'm maintaining an OpenBSD X11 window manager (WM) port, but try to keep my primary workstation on -stable, so do most of my development there and test in Xephyr. I test & submit patches from an OpenBSD -current VM running under vmm(4), but since vmm(4) doesn't emulate video hardware, I haven't been run-testing there. I'm already comfortable with x11vnc under OpenBSD, plus Xephyr, but they both use an existing X display. After studying xenodm(1), Xvfb(1), x11vnc(1), and a bunch of other X(1)-related manual pages, plus tons of experimenting, the solution was actually quite simple. TL; DR I could find much on the Internet, list archives, etc., regarding this specific situation, so here's my solution for a [slow] X11 virtual display on a vmm(4) OpenBSD guest, accessible via VNC over an SSH tunnel: doas rcctl enable xenodm doas rcctl set xenodm flags \ "-server ':0 local /usr/X11R6/bin/Xvfb :0 -screen 1024x768x24 -shmem'" doas rcctl start xenodm doas pkg_add x11vnc doas rcctl enable x11vnc doas rcctl start x11vnc Hope someone else finds this useful down the road, Morgan
Re: xenodm + Xvfb + x11vnc = virtual display for vmm(4) OpenBSD guests
On Tue, Jul 18, 2023 at 04:09:21PM -0400, Morgan Aldridge wrote: > I'm maintaining an OpenBSD X11 window manager (WM) port, but try to > keep my primary workstation on -stable, so do most of my development > there and test in Xephyr. I test & submit patches from an OpenBSD > -current VM running under vmm(4), but since vmm(4) doesn't emulate > video hardware, I haven't been run-testing there. > > I'm already comfortable with x11vnc under OpenBSD, plus Xephyr, but > they both use an existing X display. After studying xenodm(1), > Xvfb(1), x11vnc(1), and a bunch of other X(1)-related manual pages, > plus tons of experimenting, the solution was actually quite simple. > > TL; DR > > I could find much on the Internet, list archives, etc., regarding this > specific situation, so here's my solution for a [slow] X11 virtual > display on a vmm(4) OpenBSD guest, accessible via VNC over an SSH > tunnel: > > doas rcctl enable xenodm > doas rcctl set xenodm flags \ > "-server ':0 local /usr/X11R6/bin/Xvfb :0 -screen 1024x768x24 -shmem'" > doas rcctl start xenodm > doas pkg_add x11vnc > doas rcctl enable x11vnc > doas rcctl start x11vnc > > Hope someone else finds this useful down the road, > > Morgan > Thanks. Always good to have information like this on the list for later searchers. There are other ways too (like sthen@ replied subsequently).
Re: xenodm + Xvfb + x11vnc = virtual display for vmm(4) OpenBSD guests
On 2023-07-18, Morgan Aldridge wrote: > I'm maintaining an OpenBSD X11 window manager (WM) port, but try to > keep my primary workstation on -stable, so do most of my development > there and test in Xephyr. I test & submit patches from an OpenBSD > -current VM running under vmm(4), but since vmm(4) doesn't emulate > video hardware, I haven't been run-testing there. > > I'm already comfortable with x11vnc under OpenBSD, plus Xephyr, but > they both use an existing X display. After studying xenodm(1), > Xvfb(1), x11vnc(1), and a bunch of other X(1)-related manual pages, > plus tons of experimenting, the solution was actually quite simple. > > TL; DR > > I could find much on the Internet, list archives, etc., regarding this > specific situation, so here's my solution for a [slow] X11 virtual > display on a vmm(4) OpenBSD guest, accessible via VNC over an SSH > tunnel: > > doas rcctl enable xenodm > doas rcctl set xenodm flags \ > "-server ':0 local /usr/X11R6/bin/Xvfb :0 -screen 1024x768x24 -shmem'" > doas rcctl start xenodm > doas pkg_add x11vnc > doas rcctl enable x11vnc > doas rcctl start x11vnc > > Hope someone else finds this useful down the road, I recommend putting x11vnc in the bin and using tigervnc if it works for your configuration...
