Set log deletion to daily (not hourly) for Log Option #1

bazman · January 15, 2024, 6:14pm

I would like to use the ramdisk /var/log for my own logs but I want the dietpi-cleaner cron job to run daily at a specific time rather than hourly. This is so that I can schedule another job to copy my log files out to SD just before they are deleted from the RAM disk. I have an MQTT message log that would otherwise be writing to SD every couple of seconds. I’m happy for all /var/log to be deleted daily.

What would be the best way of achieving this? I haven’t used crontab before and crobtab-ui installation didn’t go well so I removed it.

Also what’s the best way of changing the RAM disk size in case I need more than 50MB? (which is what df says it currently has)

Cheers

Joulinar · January 15, 2024, 6:24pm

Basically our script has this hardcode to run on hourly basis. It’s located at /etc/cron.hourly/dietpi

github.com

MichaIng/DietPi/blob/7f8fe89f4e21921cc043f94cde3107e4ec682e2a/rootfs/etc/cron.hourly/dietpi#L22-L34


      
          	# Clear /var/log files, if DietPi-RAMlog is detected
          	[[ -f '/boot/dietpi/.installed' ]] && INDEX_LOGGING=$(sed -n '/^[[:blank:]]*INDEX_LOGGING=/{s/^[^=]*=//p;q}' /boot/dietpi/.installed)
          	# - Mode -1: Clear only
          	if (( ${INDEX_LOGGING:=0} == -1 )); then
          
          		/boot/dietpi/func/dietpi-logclear 1
          
          	# - Mode -2: Append logs at /root/logfile_storage, then clear
          	elif (( $INDEX_LOGGING == -2 )); then
          
          		/boot/dietpi/func/dietpi-logclear 0
          
          	fi

Did you already try Option #2? This will save logs to /root/logfile_storage before deletion.

bazman · January 16, 2024, 9:56am

@Joulinar Thanks for your reply.

I’ve had a look at option 2 but that will copy all the logs to SD.

I’ve decided to use the /run/ directory which is also mounted on tmpfs (the ramdisk) but isn’t affected by the cleaner script and whose content is only lost at reboot. I then have a daily cron job run under my user to move the files from ram disk to a directory on the SD card in my home directory.

system · April 15, 2024, 9:57am

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