How to execute PHP scheduled tasks in CentOS7

Preface

This article mainly introduces the relevant content about CentOS7 executing PHP scheduled tasks, and shares it for your reference and learning. Let's take a look at the detailed introduction.

1. Install crontab in CentOS 7:

yum install crontabs

grammar:

crontab [-u <username>][configuration file] or crontab [-u <username>][-elr]

parameter:

• -e Edit the timer settings for this user.
• -l Lists the timer settings for this user.
• -r Delete the timer settings for this user.
• -u<username> Specifies the user name for which the timer is to be set.

For more information about how to use the Crontab command, please refer to this article: https://www.jb51.net/article/148575.htm

1. Enter in the command line:

crontab -e

Then add the corresponding tasks, save and exit with wq;

2. Find the PHP execution directory:

which php

3. Execution script format

* * * * * /usr/local/php/bin/php /var/www/aaa.php

4. Service Status

systemctl start crond.service
systemctl stop crond.service
systemctl restart crond.service
systemctl reload crond.service
systemctl enable crond.service ##Set cron to start at boot crontab -l ##View the current cron
crontab -e ##Edit the current cron
crontab -r ##Delete the current cron

2. Practical Examples

Parameter Description

• Minute: The minute of each hour at which the task is executed. The value range is 0-59.
• Hour: the hour of the day when the task is executed, the value range is 0-23;
• Day: the day of the month on which the task is executed, ranging from 1 to 31;
• Month: the month of the year in which the task is executed, with a value range of 1-12;
• DayOfWeek: the day of the week on which the task is executed. The value range is 0-6, where 0 means the weekend.
• CommandPath: specifies the program path to be executed;

30 21 * * * /etc/init.d/nginx restart ##Restart nginx at 21:30 every night.
45 4 1,10,22 * * /etc/init.d/nginx restart ##Restart nginx at 4:45 on the 1st, 10th, and 22nd of each month.
10 1 * * 6,0 /etc/init.d/nginx restart ##Restart nginx at 1:10 every Saturday and Sunday.
0,30 18-23 * * * /etc/init.d/nginx restart ##Restart nginx every 30 minutes between 18:00 and 23:00 every day.
0 23 * * 6 /etc/init.d/nginx restart ##Restart nginx at 11:00 pm every Saturday.
* */1 * * * /etc/init.d/nginx restart ##Restart nginx every hour
* 23-7/1 * * * /etc/init.d/nginx restart ##Restart nginx every hour between 11pm and 7am
0 11 4 * mon-wed /etc/init.d/nginx restart ##Restart nginx on the 4th of each month and at 11:00 every Monday to Wednesday
0 4 1 jan * /etc/init.d/nginx restart ##Restart nginx at 4:00 on January 1st
*/30 * * * * /usr/sbin/ntpdate 210.72.145.20 ##Synchronize time every half hour

Summarize

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