Welcome to the Linux Foundation Forum!
Anyone Know Howto Create a KeepAlive Script?
Options
Xipher_Zero
Posts: 48
in Ubuntu
I run Gnome-Do's Docky interface on a number of systems and occasionally it can crash. I am looking for a way to write a keep alive script that will monitor gnome-do and if it crashes restart it.
Thanks
0
Comments
-
There are several way of fulfilling your requirement. First, your script can make use of pidof to check the pid of the command you wish to monitor. If the pid is empty, there is a possibility of the process is dead, so you run the software again.
Now, the problem is that the software is running on an X environment and the process is owned by the currently logged user. So, when you run the software again, you need to know what user privilege you are going to run the software and the display environment.
I hope my answer could give some enlightenment.
Regards,
Joko0 -
Xipher_Zero wrote:I run Gnome-Do's Docky interface on a number of systems and occasionally it can crash. I am looking for a way to write a keep alive script that will monitor gnome-do and if it crashes restart it.
Thanks
I typically use a perl wrapper (i.e., daemon) for this sort of thing. The perl script starts up, detaches from the terminal, then loops indefinitely, waking up at some interval i specify to run my generic command. In your case, i might ps/pidof |grep Do Docky and relaunch it, if not running. If you're interested, i can dig up a skel of the perl daemon. the same thing can be done in bash, too, if that's more your thang.0 -
also see this thread
http://www.linux.com/component/fireboard/?func=view&id=16&catid=190 -
atreyu wrote:Xipher_Zero wrote:I run Gnome-Do's Docky interface on a number of systems and occasionally it can crash. I am looking for a way to write a keep alive script that will monitor gnome-do and if it crashes restart it.
Thanks
I typically use a perl wrapper (i.e., daemon) for this sort of thing. The perl script starts up, detaches from the terminal, then loops indefinitely, waking up at some interval i specify to run my generic command. In your case, i might ps/pidof |grep Do Docky and relaunch it, if not running. If you're interested, i can dig up a skel of the perl daemon. the same thing can be done in bash, too, if that's more your thang.
Thank you! I'd really appreciate it, I am not a programmer and a skel to start from would be a great help!0 -
Thank you I will check it out!0
-
Here's the basics.
0. this is a Perl script, you have been warned
1. cut and paste this into a file called "mydaemon.pl", then edit...
2. define your sleep interval at the top of the script (my $sleepInt = ...)
3. the program it looks for is "foo.sh". substitute w/your process name.
4. it prints everything to STDOUT. you probably don't want this. ideally, they should go to a log, or be suppressed.
5. test before you run with:perl -cw mydaemon.pl
6. let me know if you need help tweaking...#!/usr/bin/perl use strict; use warnings; use POSIX qw(setsid); use Fcntl ':flock'; use FindBin qw($Script); # define sleep interval here (in seconds) my $sleepInt = 3; # make output line-buffered $| = 1; # daemonize open(SELFLOCK, "<$0") or die "couldn't open $0: $!\n"; flock(SELFLOCK, LOCK_EX | LOCK_NB) or die "another $Script is already running\n"; chdir('/') or die "can't chdir to '/': $!\n"; umask 0; defined(my $pid = fork) || die "can't fork: $!\n"; exit if($pid); setsid || die "can't start a new session: $!\n"; # eternal loop while ( 1 ) { # do thing here... # eg look for pid of 'foo.sh' chomp(my $pid = `/sbin/pidof -x foo.sh`); if($pid){ print "foo.sh (pid $pid) is running\n"; }else{ print "foo.sh is stopped\n"; print "starting foo.sh..."; # start the command system("foo.sh &"); } print "sleeping $sleepInt seconds...\n"; sleep $sleepInt; } # you should never get here exit(1);
0 -
atreyu wrote:Here's the basics.
0. this is a Perl script, you have been warned
1. cut and paste this into a file called "mydaemon.pl", then edit...
2. define your sleep interval at the top of the script (my $sleepInt = ...)
3. the program it looks for is "foo.sh". substitute w/your process name.
4. it prints everything to STDOUT. you probably don't want this. ideally, they should go to a log, or be suppressed.
5. test before you run with:perl -cw mydaemon.pl
6. let me know if you need help tweaking...#!/usr/bin/perl use strict; use warnings; use POSIX qw(setsid); use Fcntl ':flock'; use FindBin qw($Script); # define sleep interval here (in seconds) my $sleepInt = 3; # make output line-buffered $| = 1; # daemonize open(SELFLOCK, "<$0") or die "couldn't open $0: $!\n"; flock(SELFLOCK, LOCK_EX | LOCK_NB) or die "another $Script is already running\n"; chdir('/') or die "can't chdir to '/': $!\n"; umask 0; defined(my $pid = fork) || die "can't fork: $!\n"; exit if($pid); setsid || die "can't start a new session: $!\n"; # eternal loop while ( 1 ) { # do thing here... # eg look for pid of 'foo.sh' chomp(my $pid = `/sbin/pidof -x foo.sh`); if($pid){ print "foo.sh (pid $pid) is running\n"; }else{ print "foo.sh is stopped\n"; print "starting foo.sh..."; # start the command system("foo.sh &"); } print "sleeping $sleepInt seconds...\n"; sleep $sleepInt; } # you should never get here exit(1);
Thanks! I will work on it when I get home and let you know how it goes!0
Categories
- All Categories
- 64 LFX Mentorship
- 117 LFX Mentorship: Linux Kernel
- 618 Linux Foundation IT Professional Programs
- 322 Cloud Engineer IT Professional Program
- 141 Advanced Cloud Engineer IT Professional Program
- 56 DevOps Engineer IT Professional Program
- 67 Cloud Native Developer IT Professional Program
- 6 Express Training Courses
- 6 Express Courses - Discussion Forum
- 2.4K Training Courses
- 19 LFC110 Class Forum - Discontinued
- 9 LFC131 Class Forum
- 31 LFD102 Class Forum
- 178 LFD103 Class Forum
- LFD110 Class Forum
- 24 LFD121 Class Forum
- LFD133 Class Forum
- 2 LFD137 Class Forum
- 62 LFD201 Class Forum
- 2 LFD210 Class Forum
- 1 LFD210-CN Class Forum
- 1 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum - Discontinued
- LFD233 Class Forum
- LFD237 Class Forum
- 23 LFD254 Class Forum
- 660 LFD259 Class Forum
- 108 LFD272 Class Forum
- 1 LFD272-JP クラス フォーラム
- 4 LFD273 Class Forum
- 1 LFS101 Class Forum
- LFS116 Class Forum
- 2 LFS145 Class Forum
- LFS151 Class Forum
- LFS158 Class Forum
- LFS167 Class Forum
- 28 LFS200 Class Forum
- 740 LFS201 Class Forum - Discontinued
- 1 LFS201-JP クラス フォーラム
- 13 LFS203 Class Forum
- 98 LFS207 Class Forum
- 301 LFS211 Class Forum
- 54 LFS216 Class Forum
- 47 LFS241 Class Forum
- 41 LFS242 Class Forum
- 38 LFS243 Class Forum
- 12 LFS244 Class Forum
- LFS245 Class Forum
- 41 LFS250 Class Forum
- 1 LFS250-JP クラス フォーラム
- LFS251 Class Forum
- 143 LFS253 Class Forum
- LFS254 Class Forum
- LFS255 Class Forum
- 2 LFS256 Class Forum
- LFS257 Class Forum
- 1.2K LFS258 Class Forum
- 10 LFS258-JP クラス フォーラム
- 109 LFS260 Class Forum
- 147 LFS261 Class Forum
- 39 LFS262 Class Forum
- 83 LFS263 Class Forum - Discontinued
- 15 LFS264 Class Forum - Discontinued
- 11 LFS266 Class Forum - Discontinued
- 21 LFS267 Class Forum
- 18 LFS268 Class Forum
- 26 LFS269 Class Forum
- 204 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- LFS274 Class Forum
- 3 LFS281 Class Forum
- 258 LFW211 Class Forum
- 179 LFW212 Class Forum
- 9 SKF100 Class Forum
- SKF200 Class Forum
- 908 Hardware
- 221 Drivers
- 74 I/O Devices
- 44 Monitors
- 116 Multimedia
- 210 Networking
- 102 Printers & Scanners
- 86 Storage
- 765 Linux Distributions
- 88 Debian
- 66 Fedora
- 15 Linux Mint
- 13 Mageia
- 24 openSUSE
- 144 Red Hat Enterprise
- 33 Slackware
- 13 SUSE Enterprise
- 357 Ubuntu
- 484 Linux System Administration
- 40 Cloud Computing
- 71 Command Line/Scripting
- Github systems admin projects
- 95 Linux Security
- 80 Network Management
- 108 System Management
- 52 Web Management
- 75 Mobile Computing
- 25 Android
- 35 Development
- 1.2K New to Linux
- 1.1K Getting Started with Linux
- 544 Off Topic
- 131 Introductions
- 223 Small Talk
- 22 Study Material
- 836 Programming and Development
- 285 Kernel Development
- 517 Software Development
- 975 Software
- 261 Applications
- 185 Command Line
- 3 Compiling/Installing
- 119 Games
- 318 Installation
- 65 All In Program
- 65 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)