cronjob – cozmopics.de

My Raspberry Pi has many little applications and it happend already 2 times that the microsd was not working anymore. Therefore I decided to automate a weekly backup for my NAS.

To get the job done. First you have to mount your NAS towards your Raspberry Pi.

Make a mount towards the NAS
Create the folder /mnt/backup
Edit the the fstab file
sudo nano /etc/fstab

In my case it looks liket this

//192.168.100.2/folder/on-your-nas /mnt/backup cifs iocharset=utf8,uid=1001,gid=1001,x-systemd.automount,x-systemd.requires=network-online.target,vers=1.0,credentials=/home/user/.ds414-pi-backup.creds

create a file for the credentials
```
nano ~/.ds414-pi-backup.creds
```
You might want to set chmod / chown permission to ensure nobody else can check your .creds file.
It should look like this
```
username=myNASUSER
password=myPassword
```
To make your changes in the fstab effect type
```
sudo mount -a
```

Test your shared drive. You might want to re-start to check if the mount works fully automatically.

Once the shared drive is working download the following great script. https://github.com/lzkelley/bkup_rpimage
The script is fully based upon input from : The Raspberry Pi Backup Thread.

Put the file in the desired location. I have it in /mnt/backup
Make the script executable
```
chmod +x /mnt/backup/bkup_rpimage.sh
```

Test the script. I run it with the following command

sudo ./bkup_rpimage.sh start -L backup-$(date +%Y-%m-%d).log -czd /mnt/backup/$(uname -n)-$(date +%Y-%m-%d).img

Create a file calling the bkup_rpimage.sh with the correct variables
```
nano /mnt/backup/backup_pi.sh
```
The following content
```
#!/bin/bash
SHELL=/bin/bash
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/games:/usr/games
. /mnt/backup/bkup_rpimage.sh start -czdl /mnt/backup/$(uname -n)-$(date +%Y-%m-%d).img
```
```
chmod +x /mnt/backup/backup_pi.sh
```
This will create a backup file, gzip it and removing the unzipped version once finished. Furthermore, it will ad a log file into the folder. The PATH part has to be adjusted to your needs.

Pay attention to change the PATH variable to your needs. You can find out more about your PATH by just typing env , or you use echo $PATH. Be aware that the cronjob is running with the user of the crontab. In this szenario I decided for root as the script needs multiple permissions only root has.
Therefore, the PATH has to be set correctly.
Create a cronjob in order to automate the backup
```
sudo crontab -e
```
Add the following line at the end of the crontab file
```
0 3 * * 1 /mnt/backup/backup_pi.sh
```
This will create a cronjob running every week at 3 a.m

In order to test the script you can also change the cronjob to be executed each minute. Just type * * * * * instead of 0 3 * * * * within the crontab.

Usefull stuff:

In order to see the currently running cronjobs:

ps fauxww | grep -A 1 '[C]RON'

# Then use
Sudo kill PID

To see the furhter logging details:

sudo tail /var/log/syslog

Restore of the Backup:

In order to restore the backup on a new sd card I just used the following program:
https://www.raspberrypi.com/news/raspberry-pi-imager-imaging-utility/

You just have to select “custom img” and select the previously unzipped gz file.

Tag: cronjob

Pi-Backup automation

Restore of the Backup: