I have an Amazon EC2 instance (Ubuntu Server 13.04 - 64 bit [ami-bf1d8a8f]) running my website. I need to setup a Cron Job to get an email alert everyday.
Does anyone have any advise or possible solutions?
Thanks for your time.
It's just the same as setting up a cron job on any other server via command line.
Connect via SSH
Navigate to /etc/cron.daily
Make a new script that runs / calls a PHP script to send the email/other tasks
Make sure its executable
You can use a command such as wget -q -O temp.txt http://www.site.com/cron.php to call the PHP script, or via command line php /var/www/site/cron.php.
Regarding the wget method, temp.txt will contain the output of the script, or you can redirect the output to /dev/null. This will just discard all output. If you need to save the output of the cron script and you decided to go with the command line method then you can output the data to a file php /var/www/site/cron.php > output.txt
If you need more explanation/detail post a comment. Also take a look at Basic cron job set up to execute php file daily
Step 1: Create a bash script in the cron.daily folder
Connect to the instance via SSH, navigate to the daily cron folder with cd /etc/cron.daily. Next type sudo nano mailscript, notice there is no .sh bash extension. I had a problem with the extension which caused the script to not run.
Step 2: Bash script contents
Enter this into the command line text editor nano
#!/bin/bash
php /var/www/mail-script.php > /var/www/mail-script-log.txt
Now save the text file and exit, to save use CTRL + O and then press enter, to exit press CTRL + X.
Step 3: Make it executable
We need to allow the file to be executed, type sudo chmod +x mailscript.
Step 4: Try it out
To test it out type ./mailscript to run the cron in cron.daily. Now check your emails!
Related
I need to run a PHP script which is scraping a website for data, and I need to run it on my VPS which has linux. I want to run it as a task so that I should be able to logout of my VPS and the script should keep running in background.
I've read about CRON job but it's more for like scheduling and repetitive tasks; but I need the PHP script only once.
Is there a way in PHP to do that? Please help, I'm just a newbie to this.
Thanks in advance! :)
I've tried it as a CRON job, but it doesn't seem to serve my exact purpose.
so I run my script like this from terminal.
php scrapethewebsite.php
and then it show this
Started scraping at 10:03:00 20-03-2019
and I can't logout or close my vps/ssh connection.
I look for
php scrapethewebsite.php
Started scraping at 10:03:00 20-03-2019
and then I should be able to logout or close my connection. And then I should be able to shutdown my PC and go for a walk..
Yes, You can do this with the screen. The screen is most of the time already installed in Linux VPS. but still, you can get by command.
apt-get install screen
Its give you the ability to have multiple screens in VPS where you can run multiple tasks at the same time.
LIke you have.
Get a screen with command.
screen -S sessionname
sessionname will be ur screen name.
and you can dispach it with command/
CTRL + A, followed by D.
then you can close your putty or any tool from via you accessing your vps.
here you go.
for more information, you can follow this link.
Screen in Linux
Run this in your SSH session, then you can click X and close it and it will still run
nohup php scrapethewebsite.php >/dev/null 2>&1 &
to check if your file is running type this command
top
you should see the php file up there and press spacebar to update the list
_____________________________________________________________________
If your php script has some error from time to time or just runs out of execution time and you want to re-run it when it closes down.. you have to create a .sh file with a while loop inside it and run nohup on it so it will re-run the php file after it errors up.
If you want to use nohup on php file that needs to re-run from time to time, then you should do the following
$ echo 'while true ; do php scrapethewebsite.php ; done > /dev/null' > ~/php_run_loop.sh
$ chmod a+x ~/php_run_loop.sh
$ nohup ~/php_run_loop.sh
NOTE: If you have an error or other problem in your php script, this will cause it to run over and over again without any limit, forever.
I have a ridiculously simple shell script, nothing more than a few instructions to run some php files ...
#!/bin/bash
clear
cd /home/************** // Just for privacy here
php cron-cpt.php
php cron-lvt.php
php cron-plots.php
php cron-m.php
php cron-a.php
The script is called metrics.sh which is chmod'd and just sits in my local binary folder.
If I run the script from the command line, it works perfectly.
If I add the same script to the cron tab to run once a day, it runs over and over. I assumed the cron was the same as invoking it manually from the command line?
I'm using the same user to invoke in cron as logged on cmd line and have tried as root and a standard user, but the same results prevail.
Google has not been helpful with this. Any suggestions?
Add this to your cronTabs:
0 1 * * * /home/metrics.sh
Change the location to your metrics.sh's location.
I have a simple question, i searched and I couldn't find a solution.
I have a simple shell script that run a small php code every 2 seconds, I wrote it and save as a file:
$ cat every-2-seconds.sh
#!/bin/bash
while true
do
php /home/account/domains/domain.co.il/public_html/my-php-script.php
sleep 2
done
Now, i need that this script will always run on background, but I also need that it will run on startup, Just like a service, it should always run in background, and I never want to start it manually (of course, if something happen and it will stop, i should be able to start it manually)
I heard about nohup, but its not a service right? and I can start it on startup.. :(
Can you help me on this??
You can make your script run with this line of code (assuming you are in the directory with your script)
nohup every-2-seconds.sh &
The & will run this as a background task and nohup will keep the process running even after you've disconnected from your session.
To handle starting it on reboot you need to add this command to your crontab
crontab -e
#reboot /path/to/every-2-seconds.sh > /dev/null
In the crontab you need to specify the full path. You can change /dev/null to the file you want output to go to (assuming you want the output)
I would like to execute a cronjob for a routine task every X hours. The cronjob basically executes a shell script which in turn uses a WGET command to download files from a remote server. However, before I run this shell script I want the cronjob to execute a php script which will check whether the update's available (there's no point in wasting BW and downloading the same file over and over again) and if it is, it should pass on the update URL to the shell script which in turn uses the WGET command.
The cronjobs are set from the hosts Admin Panel. There is no other way around it. Being a shared hosting service, I am not allowed access to other functions on PHP which might do the task for me either.
Is this possible? I am Linux illiterate. I have installed a few RPM's on Fedora but that's about it. Please bear with me. Thanks!
Just pass --timestamping to your wget command.
Alternatively if you are more familiar with PHP's ways you can check this question for a usable method.
Use a curl HEAD request to get the file's headers and parse out the Last-Modified: header.
To use a php script as a regular command line executable use this as a starting point:
#!/bin/env php
<?php
echo "Hello World\n";
Save the file without the .php and tuck it somewhere that your server won't serve it.
Next, set the executable bit so that you can execute the script like a regular program
(u+x in the following command means grant the [u]ser e[x]ecute privileges for helloworld, and chmod is the command that unix variants use to set file permissions)
Omit the $ in the following sequence, as it represents the command prompt
$ chmod u+x helloworld
now you can execute your commandline script by calling it in the bash prompt:
$ ls
helloworld
$ ./helloworld
Hello World
$
From here you can get the full path of the executable script:
$ readlink -f helloworld
/home/SPI/helloworld
And now you can install the cronjob using the path to your executable script.
I have a cronjob calling a shell script. Inside that shell script and I have these lines:
php backup.php
(cat db-backup.sql ; uuencode db-backup.sql db-backup.sql) | mailx -s 'Database Daily Backup' mail#mail.com
rm -f db-backup.sql
When I run this shell script manually like this ./backup it creates a backup file of database, sends me an email and deletes the file. When cron calls this script It sends me a blank e-mail and it does not call/run the php file properly. What could be the cause of this problem?
Note: both shell script and php file has -rwxr-xr-x perms.
cron is probably not executing the script in a directory where your user account has write permissions. (On my system, ls -l /proc/$(pidof cron)/cwd shows the current working directory is /var/spool/cron/.)
Put an explicit cd /path/to/writable/directory immediately before the php line.
Use full paths when creating cron scripts. For example:
/usr/bin/php-cli backup.php