[SOLVED] automatic restart of crashed apps on Fedora

bbb13 · 07-30-2014, 03:36 AM

Is there an option to add in my .desktop file to make vino-server automatically restart after crashing??
Using Fedora 19 x64 XFCE

Code:

[Desktop Entry]
Encoding=UTF-8
Version=0.9.4
Type=Application
Name=vino
Comment=
Exec=/usr/libexec/vino-server
OnlyShowIn=XFCE;
StartupNotify=false
Terminal=false
Hidden=true

thnx in advance

lleb · 07-30-2014, 07:52 AM

no but you can create a cron script that would check ps -ef for the file/service and if not found execute the service.

bbb13 · 07-30-2014, 07:54 AM

any guidance?

lleb · 07-30-2014, 06:28 PM

for what part? the bash scripting or cron? both are out there with loads and loads of examples.

https://www.google.com/search?q=basi...m=119&ie=UTF-8

https://www.google.com/search?q=basi...=crontab+howto

what have you tried? what have you done to research this? post your code, folks will be happy to help, but not do the work for you.

bbb13 · 07-31-2014, 06:53 AM

i wasnt asking anyone to do the work for me, just a little guidance for cron jobs cause i never used them. is it possible to run vino as a systemd service and add the Restart=on-failure parameter to do the job?

lleb · 07-31-2014, 11:01 AM

possibly sadly i dont know a lot about the new systemd or how it functions yet. thus my simple recommendations of cron + bash script.

jpollard · 07-31-2014, 11:32 AM

The most trivial would be to use a script to start it:

Change the "Exec=" line from "/usr/libexec/vino-server" to something like "/home/<username>/<your path>/mystart_vino-server

And create an executable scrip "/home/<username>/<your path>/mystart_vino-server

With the contents of:

Code:

#!/bin/bash
while 1; do
    /usr/libexec/vino-server
done

Thus, whenever vino-server terminates, it is restarted.

Of course, stopping it might be a bit of an issue...

Firerat · 07-31-2014, 11:39 AM

Do we know why it crashes?

Long term it may be better to work out why it crashes and fix..

But both the cron and the while loop are solutions

bbb13 · 08-01-2014, 01:34 AM

fedora and vino-server never got along..you have authentication issues, crash issues etc. used to have the exact same setup in my server but instead of fedora x64 i had fedora x86 (because of my cpu). vino never crashed but took me forever to set it start on boot, again for no obvious reasons. in x64 i even tried running vino-server manually from ssh and connect from ultravnc and it just stop working after a couple of minutes without giving anything in the terminal,and couldnt connect anymore, only after rebooting the server. its a massive headache. i didnt find any log either for explaining why it crashes, it just does. anyways, i'll try the bash script and report back.

i'll be moving to centos soon so hopefully vino will work flawlessly there.

Firerat · 08-01-2014, 05:24 AM

This script gives you a 5 second 'window'

Code:

#!/bin/bash
while true; do
    /usr/libexec/vino-server
    for i in {1..5};do
        sleep 1
        printf "."
    done
    printf "\n"
done

This script starts a gnu screen session ( as required ), and then starts the 'VinoScript'

Code:

#!/bin/bash
grep -q Vino <<<$(screen -ls) || (
screen -s /bin/bash -dmS Vino -t Vino
)
screen -S Vino -p 0 -X stuff $'/path/to/VinoScript.sh\n'

Alternatively

Code:

#!/bin/bash
while true; do
    /usr/libexec/vino-server
    (( $? == 0 )) && break
done

This assumes a 'normal' shutdown gives exit 0, and a 'crash' gives exit of none-zero
should it exit normally we break out of the loop, else we carry on looping

You could either 'set up' a screen session, or use coproc so you don't need a term/console 'open'

Code:

#!/bin/bash
coproc Vino (
    while true; do
        /usr/libexec/vino-server
        (( $? == 0 )) && break
    done
)

bbb13 · 08-07-2014, 03:02 AM

Quote:

Originally Posted by jpollard

The most trivial would be to use a script to start it:

Change the "Exec=" line from "/usr/libexec/vino-server" to something like "/home/<username>/<your path>/mystart_vino-server

And create an executable scrip "/home/<username>/<your path>/mystart_vino-server

With the contents of:

Code:

#!/bin/bash
while 1; do
    /usr/libexec/vino-server
done

Thus, whenever vino-server terminates, it is restarted.

Of course, stopping it might be a bit of an issue...

script worked as i wanted, thank you!