I've just learned how to setup and start a web-socket server using Ratchet.
I've learned how to start the script using a command from the terminal and the script keeps running forever.
What I want to know now, is how can I start and stop that script (the web-socket server) using php code, not terminal, So that I can have a button to start and stop the web-socket server whenever I want ?
This question might seem naive, but I don't have a clue on how to this, I am new to Ratchet and web-socket.
If you know the pid, then just use command,
exec("kill -9 $pid");
Otherwise, you can use
exec("pkill $progname"); //To kill a any command with name as $progname
Please refer to this for more such options.
How to kill all processes with a given partial name?
Related
I am trying to run a bash script using php-ssh2. The script must run forever in the remote machine (the only way to stop it must be with pkill). The problem is that somehow the connection is closed and the bash script is killed.
Nohup, disown and screen... I tried everything and nothing really changed, it simply doesn't keep that script alive.
What can I do?
(I know that this is a security hole (HUGE) but this is just experimental, the main idea is using an HTML button, run a bash script in the server computer, using apache2)
Create a frequent cron job (every minute?) that first checks some kind of a flag (e.g. existence of certain file) before running a job.
In the PHP code, only raise the flag (create the file).
Does the script generate output? If not, check out the keep alive option of ssh.
I recently made the test to know if a PHP script will stop even if I disconnect. The answer was no, the script is still running and flooding my database. It's while(true) script, so do you guys know how to stop it from running?
It's not on a dedicated server that I have access... I only have the ftp, ssh , mysql access
I already tried to rename the name of the file that was executed, but it's still running
Try to get list of all processes via ssh using
ps -ax
and find process of your script. If you find this process you can kill its with
kill %pid
where %pid is the process id from table of processes.
i start a linux console app from my php5 script, it starts ok but then termintates. I've tried using system(), shell_exec and tried starting as background process but to no avail it starts and then quits.
What i am trying to achieve is from a remote browser start a console app using a php5 script and then it should remain running (just as it would if i started it from a bash shell) , i then want to send commands (from a bash shell it would be keyboard strokes) to the console app from another set of php5 scripts. Hope its clear what i am trying to do.
If anyone could give some info on the best way about doing this, as i think i may have something fundamentally wrong.
I have a Debian Lenny box running apache.The console app is just a simple program that prints to stdout and reads from stdin.
How do you expect to send input to this app? Where is it listening for input?
It simply may only support interactive use, and exit as a result of that. Or, even simpler, it may terminate because it sees that is has no input (nothing piped in or nothing from some file) and since it's not connected to an interactive shell, it has nothing to do. There's no point in waiting for input from a user that doesn't have a way to interact w/ the application.
On every request, PHP starts up, compiles your script and executes it. After execution, the script exists. When the script exits, all of the resources it was using, including file handles, database handles, and pipes to other programs are terminated.
You're going to need to find another way to keep your program open and have PHP communicate with it. Otherwise, every request to your script is going to open a new copy of the program, and then both will exit when the PHP script is complete.
Unfortunately without knowing what the program is, it will be hard to offer suggestions on how to go about doing this.
I have two problems which are related.
1) I have a batch file that contains this:
net stop wampapache
net start wampapache
Which tries to stop and start my wamp server. When I double click the stop.bat file with the above it works successfully. When I try to run that from my PHP script, it stops the server but doesn't start it fully which I am guessing is because Apache is waiting for that PHP process to exit?
function php_kill(){
exec('stop.bat', $output = array(), $return);
return $return;
}
2) Is there a way to restart my webserver (apache) whilst keeping session variables that PHP needs available?
Thanks all
The PHP process is killing a process that, in turn, kills the PHP process. It's like going back in time and murdering your parents before they gave birth to you. I don't see how it can work.
One has to ask why this functionality is necessary. If you must do it this way, you should look into scheduling a service restart from the script. I don't know if this is possible via PHP and Windows.
The problem is related to the fact that exec waits for the process to end, but the process actually kills PHP so the whole thing gets stuck.
Running stop.bat as a background process should fix it. (here how to run a background process on Windows)
I am working on a site that require a php script running on a server without any request,
it is a bot script that keeps (not full time but at least once a day) checking client accounts and send alert messages to clients when something happens.
any ideas are appreciated.
Assuming you need to do this on linux, you may run any php script from the browser and from the CLI as well.
You may run a simple php script:
<? echo "Ana are mere"; ?>
like this:
php -f ./index.php
Be careful about file-permissions, and any bug that may creep inside your code, memory leaks or unallocated variables will become VERY visible now, as the process will run continuously.
If you dont want it running in the background all the time, take a look at crontab (http://unixgeeks.org/security/newbie/unix/cron-1.html) to be able to start jobs regularly.
-- edit--
take a look at php execute a background process and PHP: How to return information to a waiting script and continue processing
Basically you want to start a background process, and you may do this by either using exec() or fsockopen() or a file_get_contents() on your own script probably in this order, if don't have access to exec, or socket functions.
Also take a look at http://us2.php.net/manual/en/function.session-write-close.php so the "background script" won't "block" the request and http://us2.php.net/manual/en/function.ignore-user-abort.php
Use a cron job to do it http://www.cronjobs.org/
You can automatically call a script at any interval you like indefinitely. Your hosting provider should support them if they are good.
You should also consider putting a unique key on the end of the page
ie. www.yoursite.com/cronjob.php?key=randomstring
and then only run the script if the key is correct, to prevent bots and other users from running the script when you don't want it run.
If you can't create a cron job, then create a page that does what you want and create a scheduled task on another machine (maybe your PC?) that just goes out and hits that page at a certain time every day.
It's really a hack, but if you absolutely can't set up a cron job, it would be an option.
As Evernoob and Quamis said, you want to have a cron job (UNIX/Linux/Mac OS) or a scheduled task (MS Windows). Furthermore, you can either have the PHP script run using the PHP command line interface (CLI), in which case you can invoke the PHP executable and then your script name. As an alternate, you can use a tool like wget (availble on all platforms) to invoke the PHP script as if someone had typed the URL in the location bar of a web browser.
A php script could not be used like you imagine here. Because it's executed through apache after a request from somewhere.
Even if you do while(1) in your script, apache/php will automaticly stop your script.
Responding to your comment, yes you'll need ssh access to do this, except if your web interface allow you to add cronjob.
Maybe you can write a service which can be executed with a program on another server and do the job.
If you have no access to the server the easiest way would probably be to hit it through the browser, but that would require you or an external script hitting the URL at the same interval each day when you wanted it to one. You may also be able to setup a Selenium test suite that runs locally on a schedule and hits the page. I'm not 100% if that's possible with Selenium though, you may need some 3rd-party apps to make it happen.
Something else you could try would be to see about using PHP's Process Control Functions (link). These will let you create a script that is a deamon and runs in the background. You may be able to do this to keep the script running on the server and firing off commands at programmed intervals. You will still need some way to get it running the first time (browser request or via command line) though.