application background
The more important directories in the system are /home, etc. Now you want to back up at 2:45am every day, back up the data to /backup, and use tar to package the backup data. How to deal with it?
solution
Step 1: Edit the backup script as follows:
[root@localhost backup]# vim /root/bin/backup.sh
#!/bin/bash
backdir="/home"
basedir=/backup
[ ! -d "$basedir" ] && mkdir $basedir
backfile=$basedir/backup.tar.gz
tar -zcvf $backfile $backdir
Step 2: Edit /etc/crontab for system backup, see the last line for the key code
[root@localhost backup]# vim /etc/crontab
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
# For details see man 4 crontabs
# 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
45 2 * * * root sh /root/bin/backup.sh