How to set up scheduled tasks in CentOS7
Today, I will talk to you about how to set up scheduled tasks in CentOS7. Many people may not know much about it. In order to make you understand better, the editor has summarized the following for you. I hope you can get something according to this article.
one。 Install the crontabs service and set up Boot:
Yum install crontabs
Systemctl enable crond
Systemctl start crond123
two。 Set up user-defined scheduled tasks:
Vi / etc/crontab
You can see:
# Example of job definition:#.-minute (0-59) # |.-hour (0-23) # | |.-day of month (1-31) # |.-month (1-12) OR jan,feb,mar,apr. # |.-day of week (0-6) (Sunday=0 or 7) OR sun Mon,tue,wed,thu,fri,sat# | # * user-name command to be executed
That is:
Minutes (0-59) hours (0-23), day (1-31), month (11-12) week (0-6 for Sunday) command to be executed by user name 1
Root executes the updatedb command every 30 minutes:
* / 30 * root updatedb1
Restart the system at 5: 00 a. M. every day:
0 5 * root reboot1
Execute the scripts.sh script in the / home/somedir directory every three seconds:
# # For excuting scripts.sh every 3 seconds##on 2014-10-15 seconds##on 1 * / home/somedir/scripts.sh
* / 1 * sleep 3 & & / home/somedir/scripts.sh
* / 1 * sleep 6 & & / home/somedir/scripts.sh
* / 1 * sleep 9 & & / home/somedir/scripts.sh
* / 1 * sleep 12 & & / home/somedir/scripts.sh
* / 1 * sleep 15 & & / home/somedir/scripts.sh
* / 1 * sleep 18 & & / home/somedir/scripts.sh
* / 1 * sleep 21 & & / home/somedir/scripts.sh
* / 1 * sleep 24 & & / home/somedir/scripts.sh
* / 1 * sleep 27 & & / home/somedir/scripts.sh
* / 1 * sleep 30 & & / home/somedir/scripts.sh
* / 1 * sleep 33 & & / home/somedir/scripts.sh
* / 1 * sleep 36 & & / home/somedir/scripts.sh
* / 1 * sleep 39 & & / home/somedir/scripts.sh
* / 1 * sleep 42 & & / home/somedir/scripts.sh
* / 1 * sleep 45 & & / home/somedir/scripts.sh
* / 1 * sleep 48 & & / home/somedir/scripts.sh
* / 1 * sleep 51 & & / home/somedir/scripts.sh
* / 1 * sleep 54 & & / home/somedir/scripts.sh
* / 1 * sleep 57 & & / home/somedir/scripts.sh223456789101112131415161718192021
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