I'd need you precious help on a matter I am spending hours on.
Scope: Apache2 and PHP running on a raspberry pi;
Premise: my little knowledge of Linux environment!
The objective: launching a long-run php script, that opens sockets, from another php script running as webpage. In other terms, the application is a chat and I need to start the php server script form a web page, for my convenience.
The issue: if I run it from the the console, logged as "pi", with the following command
php -q /var/www/chatSocket.php > /var/www/tmp/socketProcessOutput.txt 2>&1 & echo $!
it works like a charm, but if it try to do so from a script, with the following (don't mind the concatenated strings and assignment of output to variables - it made no difference removing them):
$result .= "Result of pkill (killed process): " .shell_exec('sudo pkill -f SongWebSocket.php') ."\n";
$result .= "Launching new process: id returned:". shell_exec('php -q /var/www/chatSocket.php > /var/www/tmp/socketProcessOutput.txt 2>&1 & echo $!') ."\n";
$result .= "Checking running SongWebSocket.php process:" ."\n";
$result .= shell_exec('ps -A aux| grep -e SongWebSocket.php -e USER') ."\n";
.. it does not work (it seems like it launch the script but the sockets ar not open).
Any clue why this happens?
Also, and this can be for my little knowledge of Linux, why i get a dioffrent aoutput from the command
ps aux| grep -e SongWebSocket.php -e USER
if I launch it from the shell, as user pi, or from the sript, as www-data user.
I Look forward for your help. Thanks in advance!
Marco.
www-data user doesn't have the permisson I guess. why not add "sudo" for every shell_exec line? (sudo starts the programm with root permission). it's not pretty and not secure but it might work on you local home-network. sudo php ... sudo ps -A aux etc. In addition you should make sure that the php safe_mode is off. you can see that by adding phpinfo(); to you php code
In my script I pass two argument into Bash file through PHP file.
PHP File:
$number_server = 7;
$server_name = "dbfs";
exec("/bin/bash drun.sh $number_server $server_name",$db_uptime);
foreach($db_uptime as $dbm_load){
echo $dbm_load."<br />";
}
Bash File:
#!/bin/sh
for i in seq $1; do ssh $2$i 'uptime;free -m;mpstat;cat /tmp/db2.info'; done &
pid=$!
sleep 2
kill -9 $pid
According to this it will show 7 records,but actually it shows only one record.Means FOR loop in Bash script runs only one time and second argument pass into bash is not working.
You BASH script seems to be wrong. Replace that with:
#!/bin/bash
for ((i=0; i<$1; i++)); do
ssh "$2$i" 'uptime;free -m;mpstat;cat /tmp/db2.info'
done &
pid=$!
sleep 2
kill -9 $pid
I run a small script to enable pw change via PHP. I know security might be a problem but that is not the current issue.
#!/bin/sh
echo "############### pw.sh "`date` $1 $2 "##################" >> /cronscripts/cronpw.log
echo "user_$1:$2!" >> /cronscripts/cronpw.log
echo "user_$1:$2" | chpasswd
This script works fine
When call directly ./pw.sh 5001 pw
When called with a small php Skript from the same directory
<?php
echo exec("/cronscripts/pw.sh 5001 'boris'");
?>
But it does not work when called with the same exec command by cronjob run from the root crontab.
Cron calls script:
#!/bin/sh
cd /var/www/vhosts/xxx/httpdocs/cronskripte/
echo "###############" `date` "##################" >> /cronscripts/cronuseradd.log
php5 cron_useradd.php >> /cronscripts/cronuseradd.log
useradd.php contains:
echo exec("whoami"); ==> root
echo exec("/cronscripts/pw.sh $login '$password'");
The strange thing is that cronpw.log shows the same as when called with the first 2 methods, but the pw change won't take place. Any ideas about what might be wrong?
Solution add full path of chpasswd:
echo "user_$1:$2" | /usr/sbin/chpasswd
As a general rule, to further investigate shell execution problems from PHP, use:
exec("$command $arg1 $arg2 $arg3 2>&1", $output);
var_dump($output);
I have been using the following PHP script to trigger a bash script on a server:
<?php
$output = shell_exec('cat update.sh | ssh -l some_user -i key foo.bar.com');
echo "<pre>$output</pre>";
?>
Due to issues beyond my control, we've changed servers, and I cannot run PHP (don't ask). Is there another language I can use here that will accomplish this task? Something I can target with an HTTP POST, obviously. Thanks.
You could go old-school cgi-bin and run the bash script directly:
#!/bin/bash
x=`cat update.sh | ssh -l some_user -i key foo.bar.com`
echo <<EOL
Content-type: text/html
<pre>$x</pre>
EOL
You could run a bash script directly with cgi.
#!/bin/bash
OUTPUT=`cat update.sh | ssh -l some_user -i key foo.bar.com`
# You must add following two lines before
# outputting data to the web browser from shell
# script
echo "Content-type: text/html"
echo ""
echo "<html><head><title>Demo</title></head><body>"
echo "$OUTPUT <br>"
echo "</body></html>"
Some code from here
It depends on server configuration. Task is very simple, so you can do it in every (I guess) technology your provider provides ;)
If you have access to perl:
#!/usr/bin/env perl
++$|;
print '<pre>';
system ('your command 2>&1');
print '</pre>';
Python and many others are similar.
I have a PHP script that listens on a queue. Theoretically, it's never supposed to die. Is there something to check if it's still running? Something like Ruby's God ( http://god.rubyforge.org/ ) for PHP?
God is language agnostic but it would be nice to have a solution that works on windows as well.
I had the same issue - wanting to check if a script is running. So I came up with this and I run it as a cron job. It grabs the running processes as an array and cycles though each line and checks for the file name. Seems to work fine. Replace #user# with your script user.
exec("ps -U #user# -u #user# u", $output, $result);
foreach ($output AS $line) if(strpos($line, "test.php")) echo "found";
In linux run ps as follows:
ps -C php -f
You could then do in a php script:
$output = shell_exec('ps -C php -f');
if (strpos($output, "php my_script.php")===false) {
shell_exec('php my_script.php > /dev/null 2>&1 &');
}
The above code lists all php processes running in full, then checks to see if "my_script.php" is in the list of running processes, if not it runs the process and does not wait for the process to terminate to carry on doing what it was doing.
Just append a second command after the script. When/if it stops, the second command is invoked. Eg.:
php daemon.php 2>&1 | mail -s "Daemon stopped" you#example.org
Edit:
Technically, this invokes the mailer right away, but only completes the command when the php script ends. Doing this captures the output of the php-script and includes in the mail body, which can be useful for debugging what caused the script to halt.
Simple bash script
#!/bin/bash
while [true]; do
if ! pidof -x script.php;
then
php script.php &
fi
done
Not for windows, but...
I've got a couple of long-running PHP scripts, that have a shell script wrapping it. You can optionally return a value from the script that will be checked in the shell-script to exit, restart immediately, or sleep for a few seconds -and then restart.
Here's a simple one that just keeps running the PHP script till it's manually stopped.
#!/bin/bash
clear
date
php -f cli-SCRIPT.php
echo "wait a little while ..."; sleep 10
exec $0
The "exec $0" restarts the script, without creating a sub-process that will have to unravel later (and take up resources in the meantime). This bash script wraps a mail-sender, so it's not a problem if it exits and pauses for a moment.
Here is what I did to combat a similar issue. This helps in the event anyone else has a parameterized php script that you want cron to execute frequently, but only want one execution to run at any time. Add this to the top of your php script, or create a common method.
$runningScripts = shell_exec('ps -ef |grep '.strtolower($parameter).' |grep '.dirname(__FILE__).' |grep '.basename(__FILE__).' |grep -v grep |wc -l');
if($runningScripts > 1){
die();
}
You can write in your crontab something like this:
0 3 * * * /usr/bin/php -f /home/test/test.php my_special_cron
Your test.php file should look like this:
<?php
php_sapi_name() == 'cli' || exit;
if($argv[1]) {
substr_count(shell_exec('ps -ax'), $argv[1]) < 3 || exit;
}
// your code here
That way you will have only one active instace of the cron job with my-special-cron as process key. So you can add more jobs within the same php file.
test.php system_send_emails sendEmails
test.php system_create_orders orderExport
Inspired from Justin Levene's answer and improved it as ps -C doesn't work in Mac, which I need in my case. So you can use this in a php script (maybe just before you need daemon alive), tested in both Mac OS X 10.11.4 & Ubuntu 14.04:
$daemonPath = "FULL_PATH_TO_DAEMON";
$runningPhpProcessesOfDaemon = (int) shell_exec("ps aux | grep -c '[p]hp ".$daemonPath."'");
if ($runningPhpProcessesOfDaemon === 0) {
shell_exec('php ' . $daemonPath . ' > /dev/null 2>&1 &');
}
Small but useful detail: Why grep -c '[p]hp ...' instead of grep -c 'php ...'?
Because while counting processes grep -c 'php ...' will be counted as a process that fits in our pattern. So using a regex for first letter of php makes our command different from pattern we search.
One possible solution is to have it listen on a port using the socket functions. You can check that the socket is still listening with a simple script. Even a monitoring service like pingdom could monitor its status. If it dies, the socket is no longer listening.
Plenty of solutions.. Good luck.
If you have your hands on the script, you can just ask him to set a time value every X times in db, and then let a cron job check if that value is up to date.
troelskn wrote:
Just append a second command after the script. When/if it stops, the second command is invoked. Eg.:
php daemon.php | mail -s "Daemon stopped" you#example.org
This will call mail each time a line is printed in daemon.php (which should be never, but still.)
Instead, use the double ampersand operator to separate the commands, i.e.
php daemon.php & mail -s "Daemon stopped" you#example.org
If you're having trouble checking for the PHP script directly, you can make a trivial wrapper and check for that. I'm not sufficiently familiar with Windows scripting to put how it's done here, but in Bash, it'd look like...
wrapper_for_test_php.sh
#!/bin/bash
php test.php
Then you'd just check for the wrapper like you'd check for any other bash script: pidof -x wrapper_for_test_php.sh
I have used cmder for windows and based on this script I came up with this one that I managed to deploy on linux later.
#!/bin/bash
clear
date
while true
do
php -f processEmails.php
echo "wait a little while for 5 secobds...";
sleep 5
done