How t install and configure backup in crontab
Daily/Weekly/monthly Schedule Backup Linux
* * * * * minute (0-59) ( have to use 5 digits * star or time selection)
* * * * HOUR(0-23)
* * * DAY OF MONTH (1-31)
* * MONTH (1-12)
* WEEK (0-6)
(
Run a cron job every minute
* * * * * /path/to/script.sh
Run a cron job after every 10 minutes
*/10 * * * * /path/to/script.sh
Run a cron job on specific months
To schedule a cron job to execute on specific months e.g. March, august, December, add the cron job in your crontab file
* * * jan,may,aug * /path/to/script.sh
Run a cron job on selected days
If you would like your cron job to be executed on selected days let’s suppose Sunday and Friday at 5 PM
0 17 * * sun,fri /path/to/script.sh
Run a cron job daily at a specific time
0 3 * * * /path/to/script.sh
Run a cron job on a specific day
0 0 * * SUN /path/to/script.sh
Run multiple tasks in a single cron job
To schedule multiple tasks in a single cron job, add all scripts in your crontab file by separating them with a semicolon
* * * * * /path/to/script1.sh; /path/to/script2.sh
Run a cron job on every weekday
To schedule a cron job to execute on every day of the week that is from Monday to Friday
0 0 * * 1-5 /path/to/script.sh
Run a cron job twice a day
To schedule a job to run two times a day e.g. at 6 am and 3 pm, you will need to add this line
0 6,15 * * * /path/to/script.sh
Run a cron job every hour
To schedule a cron job to execute every hour at minute 0, you will need to add this line
0 * * * * /path/to/script.sh
Run a cron job after every 3 hrs
0 */3 * * * /path/to/script.sh
Run cron job at 4:00 pm on the first of every month
0 16 1 * * /path/to/script.sh
)
Backup Resource (Host)
[root@BKPVOL ~]# yum install rsync -y
[root@rserver8 ~]# rpm -qa | grep rsync
[root@rserver8 ~]# yum install rsync -y
[root@rserver8 ~]# rpm -qi rsync
[root@rserver8]# ssh-keygen
[root@rserver8]# ssh-copy-id -i root@192.168.60.36
[root@BKPVOL ~]# ssh root@192.168.60.40
Backup script
backup.sh is in root directory
[root@rserver8]# vi /root/backup.sh
[root@BKPVOL ~]# vi /root/backup.sh
{
#!/bin/bash
/usr/bin/rsync -av -e ssh /var/www/html* root@192.168.60.40:/etc/appvolbkp/
/usr/bin/rsync -av -e ssh /var/lib/mysql* root@192.168.60.40:/etc/appvolbkp/Database
}
/usr/bin/rsync -av -e ssh /var/www/html* root@192.168.60.40:/10bkp/
Edit crontab
Run a cron job on a specific day
0 0 * * SUN /bin/bash /root/backup.sh
Run a cron job on selected days
0 17 * * sun,fri /bin/bash /root/backup.sh
Run a cron job on specific months
* * * jan,may,aug * /bin/bash /root/backup.sh
Run a cron job every minute
* * * * * bin/bash /root/backup.sh
Run a cron job daily at a specific time
0 3 * * * bin/bash /root/backup.sh
To edit the crontab file
crontab –e
[root@rserver8 backup]# crontab -e
View crontab
view crontab file
crontab -l
[root@BKPVOL ~]# tail -f /var/log/cron
Backup destination Server –
[root@volbackup]# rpm -qa | grep rsync
[root@volbackup]# yum install rsync -y
[root@rserver8 etc]# mkdir -p appvolbkp
[root@rserver8 ~]# cd /etc/appvolbkp/
