How do I turn off a display?

laredotornado · 05-16-2011, 03:24 PM

Hi,

I am running a service (Selenium) that relies on launching browsers, even when there is not an active display. So in my startup script, I have

Code:

start() {
        log_daemon_msg "Starting selenium-server server: "
        /usr/bin/Xvfb :15 -ac -screen 0 1024x768x8 &
        export DISPLAY=localhost:15.0
        su selenium -c 'java -jar /opt/selenium/selenium-server-standalone-2.0b3.jar -userExtensions /opt/selenium/user-extensions.js > /var/log/se_rc_server.log 2>&1 &'

What is the equivalent code I should put in the shutdown method? In other words, to de-activate the display? Right now, if I restart, I get the errors ...

Code:

selenium@selenium-chi:~$ sudo /etc/init.d/selenium-server start
 * Starting selenium-server server:                                                                                                                                        
Fatal server error:
Server is already active for display 15
        If this server is no longer running, remove /tmp/.X15-lock
        and start again.

Thanks, - Dave

zhjim · 05-16-2011, 04:15 PM

Dunno if it'll work but what about a

Code:

rm /tmp/.X15-lock

Valery Reznic · 05-17-2011, 03:12 PM

Quote:

Originally Posted by laredotornado

Hi,

I am running a service (Selenium) that relies on launching browsers, even when there is not an active display. So in my startup script, I have

Code:

start() {
        log_daemon_msg "Starting selenium-server server: "
        /usr/bin/Xvfb :15 -ac -screen 0 1024x768x8 &
        export DISPLAY=localhost:15.0
        su selenium -c 'java -jar /opt/selenium/selenium-server-standalone-2.0b3.jar -userExtensions /opt/selenium/user-extensions.js > /var/log/se_rc_server.log 2>&1 &'

What is the equivalent code I should put in the shutdown method? In other words, to de-activate the display? Right now, if I restart, I get the errors ...

Code:

selenium@selenium-chi:~$ sudo /etc/init.d/selenium-server start
 * Starting selenium-server server:                                                                                                                                        
Fatal server error:
Server is already active for display 15
        If this server is no longer running, remove /tmp/.X15-lock
        and start again.

Thanks, - Dave

You stop() function should kill all progerams started by start() i.e
/usr/bin/Xvfb and java.

Error message appears because you trying to run Xvfb on the same (:15) display, were it already running

laredotornado · 05-18-2011, 09:39 AM

Thanks for this, although I'm having some problems recording the process IDs. What is the correct way to get the process IDs after kicking off the jobs? I tried ...

Code:

        /usr/bin/Xvfb :15 -ac -screen 0 1024x768x16 &
        XVFB_PID=$!
        echo $XVFB_PID > /var/run/xvfb.pid
        su selenium -c 'java -jar /opt/selenium/selenium-server-standalone-2.0b3.jar -userExtensions /opt/selenium/user-extensions.js > /var/log/se_rc_server.log 2>&1 &'
        PID=$!
        ### Create the lock file ###
        echo $PID > /var/run/selenium-server.pid

but both PIDs getting recorded to the files are the same. - Dave

Valery Reznic · 05-19-2011, 02:06 PM

Quote:

Originally Posted by laredotornado

Thanks for this, although I'm having some problems recording the process IDs. What is the correct way to get the process IDs after kicking off the jobs? I tried ...

Code:

        /usr/bin/Xvfb :15 -ac -screen 0 1024x768x16 &
        XVFB_PID=$!
        echo $XVFB_PID > /var/run/xvfb.pid
        su selenium -c 'java -jar /opt/selenium/selenium-server-standalone-2.0b3.jar -userExtensions /opt/selenium/user-extensions.js > /var/log/se_rc_server.log 2>&1 &'
        PID=$!
        ### Create the lock file ###
        echo $PID > /var/run/selenium-server.pid

but both PIDs getting recorded to the files are the same. - Dave

What you done looks OK. You can add 'set -x' in the beginning of you start function, so we be able to see what going on